https://federicocalo.dev/en/blog Articles about software development, AI, machine learning, architecture and technology en Sun, 19 Jul 2026 20:14:13 GMT info@federicocalo.dev (Federico Calo) info@federicocalo.dev (Federico Calo) https://federicocalo.dev/assets/images/logo.png https://federicocalo.dev/en/blog https://federicocalo.dev/en/blog/ottimizzare-costi-llm https://federicocalo.dev/en/blog/ottimizzare-costi-llm Sun, 19 Jul 2026 09:00:00 GMT Federico Calo AI Cost Optimization How to reduce LLM inference costs from cloud API consumption to zero marginal cost with self-hosted Ollama on VPS. Strategies: GGUF quantization, semantic caching, batching, model selection... https://federicocalo.dev/en/blog/java-21-spring-boot https://federicocalo.dev/en/blog/java-21-spring-boot Wed, 15 Jul 2026 10:00:00 GMT Federico Calo Clean Architecture Java 21 LTS transforms Spring Boot development with virtual threads, advanced pattern matching, immutable records and string templates. Practical guide with real examples... https://federicocalo.dev/en/blog/jpa-flyway-clean-architecture https://federicocalo.dev/en/blog/jpa-flyway-clean-architecture Wed, 15 Jul 2026 10:00:00 GMT Federico Calo Clean Architecture How to integrate JPA/Hibernate and Flyway database migrations in the infrastructure layer of Clean Architecture Spring Boot, keeping the domain layer pure, separating JPA entities from domain models, and managing schema versioning with full traceability. https://federicocalo.dev/en/blog/testing-spring-testcontainers https://federicocalo.dev/en/blog/testing-spring-testcontainers Wed, 15 Jul 2026 10:00:00 GMT Federico Calo Clean Architecture Complete guide to Testcontainers for Spring Boot integration testing. Real PostgreSQL and Redis containers, @DynamicPropertySource, container reuse, testing infrastructure layer in Clean Architecture, CI/CD best practices. https://federicocalo.dev/en/blog/solid-java-typescript https://federicocalo.dev/en/blog/solid-java-typescript Wed, 15 Jul 2026 10:00:00 GMT Federico Calo Clean Architecture The 5 SOLID principles (SRP, OCP, LSP, ISP, DIP) explained with real-world examples in Java 21 and TypeScript. For each: an anti-pattern (wrong) and the correct version (right). Link SOLID to Clean Architecture. Examples from Spring Boot and Angular. https://federicocalo.dev/en/blog/domain-layer-clean-architecture https://federicocalo.dev/en/blog/domain-layer-clean-architecture Wed, 15 Jul 2026 10:00:00 GMT Federico Calo Clean Architecture The domain layer is the heart of Clean Architecture: pure business logic, zero Spring, zero JPA. Learn how to model immutable entities with Java records, implement value objects with constructor-based validation, and protect business rules. https://federicocalo.dev/en/blog/use-case-spring-clean https://federicocalo.dev/en/blog/use-case-spring-clean Wed, 15 Jul 2026 10:00:00 GMT Federico Calo Clean Architecture Application layer with use case (interactor), ports and DTO as Java records. Orchestration domain-infrastructure without presentation coupling. Transactions, dependency injection, anti-pattern business logic in controller. https://federicocalo.dev/en/blog/infrastructure-jpa-redis https://federicocalo.dev/en/blog/infrastructure-jpa-redis Wed, 15 Jul 2026 10:00:00 GMT Federico Calo Clean Architecture The infrastructure layer implements the ports of domain/application through adapters: JPA for persistence, Redis for caching, WebClient for external services. How to maintain the dependency arrow toward the domain, avoid fatal couplings, and scale with concrete patterns on Spring Boot 3.4, PostgreSQL 16 and Redis Stack 7. https://federicocalo.dev/en/blog/testing-clean-architecture https://federicocalo.dev/en/blog/testing-clean-architecture Wed, 15 Jul 2026 10:00:00 GMT Federico Calo Clean Architecture The test pyramid in Clean Architecture: pure domain unit tests (no mocks, JUnit 5 only), use case tests with mocked ports (Mockito), infrastructure integration tests with Testcontainers. Coverage per layer, what NOT to test, Java 21 + JUnit 5 examples. https://federicocalo.dev/en/blog/lightgbm-sport-prediction https://federicocalo.dev/en/blog/lightgbm-sport-prediction Wed, 15 Jul 2026 10:00:00 GMT Federico Calo AI Engineering Sports prediction pipeline with LightGBM in Python: feature engineering, gradient boosting, probabilistic calibration, evaluation with Brier score on a dataset of 2000+ matches. https://federicocalo.dev/en/blog/saas-pricing-founder-eu https://federicocalo.dev/en/blog/saas-pricing-founder-eu Wed, 15 Jul 2026 10:00:00 GMT Federico Calo Founder Tools Guide to SaaS pricing models (flat, tiered, per-seat, usage-based, freemium), value-based pricing, price anchoring, VAT/MOSS EU compliance, reverse charge B2B, currencies. How to test prices and maximize revenue for European startups. https://federicocalo.dev/en/blog/hiring-startup-eu https://federicocalo.dev/en/blog/hiring-startup-eu Wed, 15 Jul 2026 10:00:00 GMT Federico Calo Founder Tools How to hire in a European startup. Employment contract types, equity with vesting and cliff, cross-border employer of record, tax compliance and GDPR, technical hiring process, remote-first team building. https://federicocalo.dev/en/blog/privacy-by-design-ai https://federicocalo.dev/en/blog/privacy-by-design-ai Wed, 15 Jul 2026 10:00:00 GMT Federico Calo EU AI Act Privacy by Design & by Default (GDPR Article 25) applied to AI systems — data minimization, pseudonymization, DPIA for high-risk AI, legal basis for training, retention, data subject rights in ML pipeline, intersection with EU AI Act. With Ollama on-prem for guaranteed privacy. https://federicocalo.dev/en/blog/prompt-engineering-code https://federicocalo.dev/en/blog/prompt-engineering-code Wed, 15 Jul 2026 10:00:00 GMT Federico Calo AI Engineering Practical guide to prompt engineering techniques for reliable code generation with LLMs. Few-shot learning, chain-of-thought, role prompting, structured output, iteration and evaluation. Real examples with Ollama on-prem. https://federicocalo.dev/en/blog/angular-i18n-18-lingue https://federicocalo.dev/en/blog/angular-i18n-18-lingue Wed, 15 Jul 2026 10:00:00 GMT Federico Calo Angular Moderno Practical guide to i18n consolidation in Angular 21 SSR: migrating from 18 runtime languages (XLF translation) to Pattern A (IT+EN compiled AOT). i18n markers, build gates, configuration, trade-off reasoning, and lessons learned. https://federicocalo.dev/en/blog/reranking-rag-cross-encoder https://federicocalo.dev/en/blog/reranking-rag-cross-encoder Wed, 15 Jul 2026 10:00:00 GMT Federico Calo RAG Engineering Two-stage retrieval for perfect relevance: bi-encoder for fast retrieval, cross-encoder for intelligent re-ranking of top-k. Quality metrics (nDCG, MRR, recall@k), latency-quality trade-offs, and real-world implementation with sentence-transformers + RediSearch on local Ollama. https://federicocalo.dev/en/blog/fastapi-ml-pydantic https://federicocalo.dev/en/blog/fastapi-ml-pydantic Wed, 15 Jul 2026 10:00:00 GMT Federico Calo AI Engineering Build ML microservices with FastAPI (Python 3.12) and Pydantic v2: request/response validation, async/await, lifespan for model loading at boot, dependency injection, health checks, graceful degradation with on-prem Ollama. https://federicocalo.dev/en/blog/provider-deployer-eu-ai-act https://federicocalo.dev/en/blog/provider-deployer-eu-ai-act Wed, 15 Jul 2026 10:00:00 GMT Federico Calo EU AI Act The distinction between provider and deployer in EU Regulation 2024/1689 is critical: each role has precise responsibilities for risk management, technical documentation, logging, and transparency. Guide to 4 risk levels, high-risk system obligations, timeline, and operational checklist. https://federicocalo.dev/en/blog/conformity-assessment-eu-ai https://federicocalo.dev/en/blog/conformity-assessment-eu-ai Wed, 15 Jul 2026 10:00:00 GMT Federico Calo EU AI Act Operational guide to conformity assessment for high-risk AI systems. Internal evaluation, Notified Body involvement, EU Declaration of Conformity, CE marking, NEBA registration, post-market monitoring. Checklists and templates. https://federicocalo.dev/en/blog/llm-italiani-2024 https://federicocalo.dev/en/blog/llm-italiani-2024 Wed, 15 Jul 2026 10:00:00 GMT Federico Calo Italian NLP In 2024, the first Large Language Models fully trained or significantly adapted for Italian emerge: Minerva (Sapienza NLP), LLaMAntino, Camoscio, and Fauno represent a breakthrough in Italian NLP. Features, datasets, benchmarks... https://federicocalo.dev/en/blog/landscape-llm-italiani https://federicocalo.dev/en/blog/landscape-llm-italiani Wed, 15 Jul 2026 10:00:00 GMT Federico Calo Italian NLP 2025 overview of the Italian language model ecosystem — new models, Italian benchmarks, how to select the right model for your use case, and local deployment via Ollama on-prem. https://federicocalo.dev/en/blog/nlp-italiano-spacy https://federicocalo.dev/en/blog/nlp-italiano-spacy Wed, 15 Jul 2026 10:00:00 GMT Federico Calo Italian NLP Complete NLP pipeline for Italian: tokenization, POS tagging, lemmatization, NER and dependency parsing with spaCy and Hugging Face transformers. Italian models (BERT, UmBERTo), language-specific challenges, sentiment analysis and text classification with Python 3.12 examples. https://federicocalo.dev/en/blog/fine-tuning-llm-italiano https://federicocalo.dev/en/blog/fine-tuning-llm-italiano Wed, 15 Jul 2026 10:00:00 GMT Federico Calo Italian NLP How to fine-tune an open-source model for Italian using LoRA on consumer GPUs, prepare quality datasets, evaluate performance with Italian benchmarks, and deploy locally via Ollama... https://federicocalo.dev/en/blog/rag-italiano-embedding https://federicocalo.dev/en/blog/rag-italiano-embedding Wed, 15 Jul 2026 10:00:00 GMT Federico Calo Italian NLP Building an effective RAG pipeline for Italian content: choosing multilingual embeddings, semantic chunking, RediSearch HNSW, retrieval + re-ranking, generation with Ollama on-prem, quality evaluation. https://federicocalo.dev/en/blog/crewai-produzione-multi-agent https://federicocalo.dev/en/blog/crewai-produzione-multi-agent Wed, 15 Jul 2026 10:00:00 GMT Federico Calo Multi-Agent AI Systems CrewAI orchestrates specialized AI agents with clear tasks, integrated tools, and persistent memory. Complete guide on production architecture, Ollama on-prem, PostgreSQL, observability and scaling. https://federicocalo.dev/en/blog/inp-cwv-angular-ssr-59-to-88-four-fixes https://federicocalo.dev/en/blog/inp-cwv-angular-ssr-59-to-88-four-fixes Tue, 14 Jul 2026 11:05:00 GMT Federico Calo Original Research Four real interventions that took an Angular SSR home page from a mobile PageSpeed score of 59 to 88: precompute instead of fan-out, PlatformLocation instead of REQUEST at prerender, read/write split with afterNextRender, and a prerender-compatible host-based CSP. With measured numbers and a public repository. https://federicocalo.dev/en/blog/projecthub-poker-retro-be-fe-slice-schema-real-time https://federicocalo.dev/en/blog/projecthub-poker-retro-be-fe-slice-schema-real-time Tue, 14 Jul 2026 11:00:00 GMT Federico Calo Architecture Real-time collaboration is a schema problem, not a WebSocket problem. I document the ProjectHub Poker/Retro vertical (V184/V185) as a real end-to-end slice: eleven Postgres tables, a one-directional phase FSM, STOMP broadcast, server-side anonymity, and a dot-voting budget, with the trade-offs declared at every fork. No code changes. https://federicocalo.dev/en/blog/production-postmortems-flyway-jar-deploy-duplicate-beans https://federicocalo.dev/en/blog/production-postmortems-flyway-jar-deploy-duplicate-beans Tue, 14 Jul 2026 10:50:00 GMT Federico Calo Platform Engineering A comment in an applied Flyway migration breaks the checksum. A non-atomic cp during deploy causes an intermittent NoClassDefFoundError. Two beans with the same simple name crash the boot. Three real incidents, one root cause: violated immutability. https://federicocalo.dev/en/blog/multi-bucket-rate-limiting-bucket4j-postmortem https://federicocalo.dev/en/blog/multi-bucket-rate-limiting-bucket4j-postmortem Tue, 14 Jul 2026 10:45:00 GMT Federico Calo DevSecOps Four separate Bucket4j buckets (API, AI, report download, token) versus one shared number. Routing to the right bucket is where real bugs are born: the postmortem of the CSP-report flood that blocked email verification with 429s. https://federicocalo.dev/en/blog/archunit-clean-architecture-4-layer-diagram-lie https://federicocalo.dev/en/blog/archunit-clean-architecture-4-layer-diagram-lie Tue, 14 Jul 2026 10:40:00 GMT Federico Calo Architettura Software The backend's ArchUnit gate was running zero executed tests, a total false green. How I found it, what I froze with FreezingArchRule (30+4 historical violations), and why a 4-layer diagram without automated enforcement is not an architecture. https://federicocalo.dev/en/blog/production-postmortems-flyway-archunit-jar-race-duplicate-beans https://federicocalo.dev/en/blog/production-postmortems-flyway-archunit-jar-race-duplicate-beans Tue, 14 Jul 2026 10:10:58 GMT Federico Calo Original Research Four real production incidents that all started from a fully green build: a Flyway crash from a removed comment, an ArchUnit gate dead for months, a JAR deploy race condition, a duplicate Spring bean. Root cause, fix, and a reproducible public repository for each. https://federicocalo.dev/en/blog/how-i-build-in-4-hours-gsd-agentic-workflow https://federicocalo.dev/en/blog/how-i-build-in-4-hours-gsd-agentic-workflow Tue, 14 Jul 2026 10:00:00 GMT Federico Calo Claude Code Workflow Claude Code Workflow series. How I built a custom booking module in a little over four hours with GSD and specialized agents: the real per-phase time datum, the trade-offs, and why AI is accompaniment and never the director. Portfolio AI provider: Ollama on-prem. https://federicocalo.dev/en/blog/onpush-signals-default-not-exception-angular-21 https://federicocalo.dev/en/blog/onpush-signals-default-not-exception-angular-21 Tue, 14 Jul 2026 09:52:54 GMT Federico Calo Angular Moderno 1215 out of 1219 components in this portfolio use ChangeDetectionStrategy.OnPush. Why "turn it on when I need it" is a comfortable lie, what immutability discipline actually costs, and when Default is the better call instead. https://federicocalo.dev/en/blog/strict-mode-not-enough-any-typescript-monorepo https://federicocalo.dev/en/blog/strict-mode-not-enough-any-typescript-monorepo Tue, 14 Jul 2026 09:52:54 GMT Federico Calo TypeScript Avanzato strict, strictTemplates, and strictInjectionParameters all on, yet 54 ': any' and 46 'as any' survive across 3884 files. Why strict mode only eliminates accidental errors, not deliberate escape hatches, and what to actually do about the remaining anys. https://federicocalo.dev/en/blog/prerender-vs-server-on-demand-angular-blog-articles https://federicocalo.dev/en/blog/prerender-vs-server-on-demand-angular-blog-articles Tue, 14 Jul 2026 09:52:54 GMT Federico Calo Angular Moderno app.routes.server.ts assigns Prerender to 50 route configurations and Server to 134, deliberately including every article page. Why "prerender everything" stops being safe advice past a certain scale, and the real trade-off between TTFB and build stability. https://federicocalo.dev/en/blog/clean-architecture-spring-boot-template-archunit-gate-that-runs https://federicocalo.dev/en/blog/clean-architecture-spring-boot-template-archunit-gate-that-runs Tue, 14 Jul 2026 09:30:00 GMT Federico Calo Original Research Most Clean Architecture templates ship a green-for-nothing ArchUnit gate that runs zero tests. I extracted a Spring Boot 3.4 template from my production backend, sanitized by hand (no git filter-repo), with JWT, Flyway, and an ArchUnit gate that genuinely executes four rules. Public repo, green build on JDK 21. https://federicocalo.dev/en/blog/side-project-case-study-italiani https://federicocalo.dev/en/blog/side-project-case-study-italiani Tue, 14 Jul 2026 09:30:00 GMT Federico Calo Indie Maker Italia Analysis of 5 Italian side projects launched in 2024-2025: strategies, mistakes, real costs, and ROI. How indie makers from Turin, Milan, and Rome transformed an idea into 5-6 figure revenue. https://federicocalo.dev/en/blog/ai-on-prem-vs-cloud-privacy-cost-data-sovereignty https://federicocalo.dev/en/blog/ai-on-prem-vs-cloud-privacy-cost-data-sovereignty Tue, 14 Jul 2026 09:24:30 GMT Federico Calo Platform Engineering A B2B comparison with real TCO: on-prem AI with Ollama on a VPS costs zero extra per month, metered cloud bills per token. An honest trade-off on cost, latency, model ceiling, and data sovereignty for decision-makers. https://federicocalo.dev/en/blog/geo-retrofit-benchmark-741-to-0-structural-errors https://federicocalo.dev/en/blog/geo-retrofit-benchmark-741-to-0-structural-errors Tue, 14 Jul 2026 09:14:16 GMT Federico Calo Original Research Most GEO advice is cosmetic. An additive engine (injects, does not rewrite) took 741 structural errors to zero across 194 bilingual articles: 386 missing-FAQ errors closed automatically, 310 missing-citation errors closed only after manual review. https://federicocalo.dev/en/blog/sport-intelligence-benchmark-97k-matches https://federicocalo.dev/en/blog/sport-intelligence-benchmark-97k-matches Tue, 14 Jul 2026 08:51:44 GMT Federico Calo Original Research Why accuracy lies about football predictions and the Brier score does not. The portfolio's Sport Intelligence engine publishes a Brier score of 0.5783 across 97,000 historical matches, with a V2 LightGBM ensemble, isotonic calibration, and a reproducible public repo. https://federicocalo.dev/en/blog/funding-oss-eu-nlnet-sovereign https://federicocalo.dev/en/blog/funding-oss-eu-nlnet-sovereign Sat, 20 Jun 2026 08:00:00 GMT Federico Calo OSS Sustainability How to access European funding for open source: NLnet Foundation, Sovereign Tech Fund, and NGI programs. Complete guide to applications, budgeting, and winning case studies from the OSS community. https://federicocalo.dev/en/blog/open-core-business-case-studies https://federicocalo.dev/en/blog/open-core-business-case-studies Sat, 20 Jun 2026 04:41:27 GMT Federico Calo OSS Sustainability Articolo della serie Open Source Sustainability 2027. Pubblicazione prevista 02 December 2027. https://federicocalo.dev/en/blog/maintainer-burnout-prevenzione https://federicocalo.dev/en/blog/maintainer-burnout-prevenzione Sat, 20 Jun 2026 01:22:55 GMT Federico Calo OSS Sustainability Article from the Open Source Sustainability 2027 series. Maintainer burnout is a silent crisis that strikes open source project stewards. Concrete strategies through automation, community management, and economic sustainability to prevent exhaustion. https://federicocalo.dev/en/blog/oss-commercial-agpl-bsl-elastic https://federicocalo.dev/en/blog/oss-commercial-agpl-bsl-elastic Fri, 19 Jun 2026 22:04:22 GMT Federico Calo OSS Sustainability When you publish an open source project, you must choose how to protect yourself from those who profit without contributing. AGPL, BSL, and Elastic License offer three different strategies for commercial copyleft. https://federicocalo.dev/en/blog/sponsor-models-github-open-collective https://federicocalo.dev/en/blog/sponsor-models-github-open-collective Fri, 19 Jun 2026 18:45:50 GMT Federico Calo OSS Sustainability Discover the two leading platforms for monetizing open source projects: GitHub Sponsors vs Open Collective. Analysis of pros/cons, revenue models, case studies and the right strategy for your project. https://federicocalo.dev/en/blog/playwright-a11y-axe-core https://federicocalo.dev/en/blog/playwright-a11y-axe-core Fri, 19 Jun 2026 15:27:17 GMT Federico Calo Playwright Components Article from the Playwright Component Testing Avanzato series. Published November 26, 2027. https://federicocalo.dev/en/blog/playwright-mock-network-interception https://federicocalo.dev/en/blog/playwright-mock-network-interception Fri, 19 Jun 2026 12:08:45 GMT Federico Calo Playwright Components Articolo della serie Playwright Component Testing Avanzato. Pubblicazione prevista 25 November 2027. https://federicocalo.dev/en/blog/test-parallelism-playwright-shard https://federicocalo.dev/en/blog/test-parallelism-playwright-shard Fri, 19 Jun 2026 08:50:13 GMT Federico Calo Playwright Components Articolo della serie Playwright Component Testing Avanzato. Pubblicazione prevista 24 November 2027. https://federicocalo.dev/en/blog/visual-regression-playwright-percy https://federicocalo.dev/en/blog/visual-regression-playwright-percy Fri, 19 Jun 2026 05:31:40 GMT Federico Calo Playwright Components Automate visual testing of your components with Percy and Playwright. Learn to capture snapshots, manage baselines, and integrate visual regression into CI/CD. https://federicocalo.dev/en/blog/playwright-component-testing-setup https://federicocalo.dev/en/blog/playwright-component-testing-setup Fri, 19 Jun 2026 02:13:08 GMT Federico Calo Playwright Components Article in the Playwright Component Testing Advanced series. Complete Playwright setup for component testing in Angular with fixtures, configuration and best practices. https://federicocalo.dev/en/blog/bun-production-docker-kubernetes https://federicocalo.dev/en/blog/bun-production-docker-kubernetes Thu, 18 Jun 2026 22:54:35 GMT Federico Calo Bun Runtime 2027 Articolo della serie Bun Runtime Production 2027. Pubblicazione prevista 19 November 2027. https://federicocalo.dev/en/blog/bun-hono-stack-edge https://federicocalo.dev/en/blog/bun-hono-stack-edge Thu, 18 Jun 2026 19:36:03 GMT Federico Calo Bun Runtime 2027 Articolo della serie Bun Runtime Production 2027. Pubblicazione prevista 18 November 2027. https://federicocalo.dev/en/blog/bun-nativo-sqlite-redis https://federicocalo.dev/en/blog/bun-nativo-sqlite-redis Thu, 18 Jun 2026 16:17:31 GMT Federico Calo Bun Runtime 2027 Articolo della serie Bun Runtime Production 2027. Pubblicazione prevista 17 November 2027. https://federicocalo.dev/en/blog/migrazione-node-bun-gotchas https://federicocalo.dev/en/blog/migrazione-node-bun-gotchas Thu, 18 Jun 2026 12:58:58 GMT Federico Calo Bun Runtime 2027 Articolo della serie Bun Runtime Production 2027. Pubblicazione prevista 16 November 2027. https://federicocalo.dev/en/blog/bun-vs-node-deno-2027 https://federicocalo.dev/en/blog/bun-vs-node-deno-2027 Thu, 18 Jun 2026 09:40:26 GMT Federico Calo Bun Runtime 2027 Articolo della serie Bun Runtime Production 2027. Pubblicazione prevista 15 November 2027. https://federicocalo.dev/en/blog/tauri-mobile-android-ios https://federicocalo.dev/en/blog/tauri-mobile-android-ios Thu, 18 Jun 2026 06:21:53 GMT Federico Calo Tauri Rust Desktop Articolo della serie Tauri 2 + Rust Desktop Apps. Pubblicazione prevista 12 November 2027. https://federicocalo.dev/en/blog/cross-platform-deploy-tauri https://federicocalo.dev/en/blog/cross-platform-deploy-tauri Thu, 18 Jun 2026 03:03:21 GMT Federico Calo Tauri Rust Desktop Articolo della serie Tauri 2 + Rust Desktop Apps. Pubblicazione prevista 11 November 2027. https://federicocalo.dev/en/blog/tauri-plugins-ecosystem-2027 https://federicocalo.dev/en/blog/tauri-plugins-ecosystem-2027 Wed, 17 Jun 2026 23:44:49 GMT Federico Calo Tauri Rust Desktop Articolo della serie Tauri 2 + Rust Desktop Apps. Pubblicazione prevista 10 November 2027. https://federicocalo.dev/en/blog/rust-frontend-integration-tipi https://federicocalo.dev/en/blog/rust-frontend-integration-tipi Wed, 17 Jun 2026 20:26:16 GMT Federico Calo Tauri Rust Desktop Article from the Tauri 2 + Rust Desktop Apps series. Published 17 June 2026. https://federicocalo.dev/en/blog/tauri-2-vs-electron-bundle https://federicocalo.dev/en/blog/tauri-2-vs-electron-bundle Wed, 17 Jun 2026 17:07:44 GMT Federico Calo Tauri Rust Desktop Articolo della serie Tauri 2 + Rust Desktop Apps. Pubblicazione prevista 08 November 2027. https://federicocalo.dev/en/blog/cost-optimization-vector-db-tier https://federicocalo.dev/en/blog/cost-optimization-vector-db-tier Wed, 17 Jun 2026 13:49:11 GMT Federico Calo Vector DB Decision Articolo della serie Vector DB Decision Tree 2027. Pubblicazione prevista 05 November 2027. https://federicocalo.dev/en/blog/vector-db-scaling-100m https://federicocalo.dev/en/blog/vector-db-scaling-100m Wed, 17 Jun 2026 10:30:39 GMT Federico Calo Vector DB Decision Modern Vector Databases can scale beyond 100 million vectors while maintaining sub-100ms query latency using HNSW hierarchical indexing, geographic sharding, quantized compression, and batch processing. https://federicocalo.dev/en/blog/hybrid-search-bm25-dense https://federicocalo.dev/en/blog/hybrid-search-bm25-dense Wed, 17 Jun 2026 07:12:07 GMT Federico Calo Vector DB Decision Hybrid search combines BM25 (lexical search) and dense embeddings (semantic search) for the best of both worlds. Discover how to implement it with RediSearch and Ollama, practical trade-offs, and real-world use cases. https://federicocalo.dev/en/blog/quando-non-vector-db-alternative https://federicocalo.dev/en/blog/quando-non-vector-db-alternative Wed, 17 Jun 2026 03:53:34 GMT Federico Calo Vector DB Decision Articolo della serie Vector DB Decision Tree 2027. Pubblicazione prevista 02 November 2027. https://federicocalo.dev/en/blog/pgvector-qdrant-weaviate-benchmark https://federicocalo.dev/en/blog/pgvector-qdrant-weaviate-benchmark Wed, 17 Jun 2026 00:35:02 GMT Federico Calo Vector DB Decision Articolo della serie Vector DB Decision Tree 2027. Pubblicazione prevista 01 November 2027. https://federicocalo.dev/en/blog/multi-agent-debugging-observability https://federicocalo.dev/en/blog/multi-agent-debugging-observability Tue, 16 Jun 2026 21:16:29 GMT Federico Calo Agentic Platforms Implement end-to-end observability in multi-agent systems with distributed tracing, structured logging, and metrics. https://federicocalo.dev/en/blog/agentic-platforms-self-hosted-cost https://federicocalo.dev/en/blog/agentic-platforms-self-hosted-cost Tue, 16 Jun 2026 17:57:57 GMT Federico Calo Agentic Platforms TCO analysis: self-hosted Ollama on Hetzner VPS (€228/year) vs cloud APIs. Break-even within 2-3 months at >30K requests/month. Setup guide, cost calculator, and scaling strategy. https://federicocalo.dev/en/blog/langgraph-mastra-crewai-decision https://federicocalo.dev/en/blog/langgraph-mastra-crewai-decision Tue, 16 Jun 2026 14:39:24 GMT Federico Calo Agentic Platforms Articolo della serie Self-hosted Agentic Platforms. Pubblicazione prevista 08 October 2027. https://federicocalo.dev/en/blog/mastra-framework-agentic-typescript https://federicocalo.dev/en/blog/mastra-framework-agentic-typescript Tue, 16 Jun 2026 08:02:20 GMT Federico Calo Agentic Platforms Articolo della serie Self-hosted Agentic Platforms. Pubblicazione prevista 06 October 2027. https://federicocalo.dev/en/blog/letta-memgpt-memoria-persistente https://federicocalo.dev/en/blog/letta-memgpt-memoria-persistente Tue, 16 Jun 2026 04:43:47 GMT Federico Calo Agentic Platforms Articolo della serie Self-hosted Agentic Platforms. Pubblicazione prevista 05 October 2027. https://federicocalo.dev/en/blog/crescita-carriera-tech-italia-roadmap https://federicocalo.dev/en/blog/crescita-carriera-tech-italia-roadmap Tue, 16 Jun 2026 01:25:15 GMT Federico Calo Italian Tech Survey Article from the Italian Tech Salaries Survey 2027 series. Practical 5-year guide to evolve from junior developer to senior specialist with detailed roadmap, critical competencies, and salary expectations. https://federicocalo.dev/en/blog/remote-vs-in-office-gap-salariale https://federicocalo.dev/en/blog/remote-vs-in-office-gap-salariale Mon, 15 Jun 2026 22:06:42 GMT Federico Calo Italian Tech Survey Articolo della serie Italian Tech Salaries Survey 2027. Pubblicazione prevista 01 October 2027. https://federicocalo.dev/en/blog/stipendi-devops-cloud-italia-2027 https://federicocalo.dev/en/blog/stipendi-devops-cloud-italia-2027 Mon, 15 Jun 2026 18:48:10 GMT Federico Calo Italian Tech Survey Articolo della serie Italian Tech Salaries Survey 2027. Pubblicazione prevista 30 September 2027. https://federicocalo.dev/en/blog/stipendi-ai-ml-italia-2027 https://federicocalo.dev/en/blog/stipendi-ai-ml-italia-2027 Mon, 15 Jun 2026 15:29:38 GMT Federico Calo Italian Tech Survey Articolo della serie Italian Tech Salaries Survey 2027. Pubblicazione prevista 29 September 2027. https://federicocalo.dev/en/blog/stipendi-backend-italia-2027 https://federicocalo.dev/en/blog/stipendi-backend-italia-2027 Mon, 15 Jun 2026 12:11:05 GMT Federico Calo Italian Tech Survey Articolo della serie Italian Tech Salaries Survey 2027. Pubblicazione prevista 28 September 2027. https://federicocalo.dev/en/blog/italian-tech-salaries-2027-report https://federicocalo.dev/en/blog/italian-tech-salaries-2027-report Mon, 15 Jun 2026 08:52:33 GMT Federico Calo Italian Tech Survey Articolo della serie Italian Tech Salaries Survey 2027. Pubblicazione prevista 27 September 2027. https://federicocalo.dev/en/blog/compliance-toolkit-audit-ai https://federicocalo.dev/en/blog/compliance-toolkit-audit-ai Mon, 15 Jun 2026 05:34:00 GMT Federico Calo AI Policy EU Articolo della serie AI Policy & Governance EU 2027. Pubblicazione prevista 24 September 2027. https://federicocalo.dev/en/blog/privacy-by-design-ai-gdpr https://federicocalo.dev/en/blog/privacy-by-design-ai-gdpr Mon, 15 Jun 2026 02:15:28 GMT Federico Calo AI Policy EU Privacy by Design is not optional in Europe: it is a GDPR Art. 25 obligation, extended by the AI Act with requirements for AI systems. Guide to 6 pillars, data minimization, consent, explainability, DPIA, differential privacy, governance, and compliance framework in code. https://federicocalo.dev/en/blog/ai-watermarking-tecniche-mandate https://federicocalo.dev/en/blog/ai-watermarking-tecniche-mandate Sun, 14 Jun 2026 22:56:56 GMT Federico Calo AI Policy EU Articolo della serie AI Policy & Governance EU 2027. Pubblicazione prevista 22 September 2027. https://federicocalo.dev/en/blog/gpai-obblighi-general-purpose-2027 https://federicocalo.dev/en/blog/gpai-obblighi-general-purpose-2027 Sun, 14 Jun 2026 19:38:23 GMT Federico Calo AI Policy EU Articolo della serie AI Policy & Governance EU 2027. Pubblicazione prevista 21 September 2027. https://federicocalo.dev/en/blog/ai-liability-directive-responsabilita https://federicocalo.dev/en/blog/ai-liability-directive-responsabilita Sun, 14 Jun 2026 16:19:51 GMT Federico Calo AI Policy EU The AI Liability Directive introduces accountability obligations for developers, providers, and operators. Complete guide to the 4 pillars, technical obligations, code compliance patterns, and 2027 timeline. https://federicocalo.dev/en/blog/ai-act-2027-update-developer https://federicocalo.dev/en/blog/ai-act-2027-update-developer Sun, 14 Jun 2026 13:01:18 GMT Federico Calo AI Policy EU Articolo della serie AI Policy & Governance EU 2027. Pubblicazione prevista 17 September 2027. https://federicocalo.dev/en/blog/sustainable-ai-eu-regulation-2027 https://federicocalo.dev/en/blog/sustainable-ai-eu-regulation-2027 Sun, 14 Jun 2026 09:42:46 GMT Federico Calo Sustainable AI Articolo della serie Sustainable AI / Green Software 2027. Pubblicazione prevista 16 September 2027. https://federicocalo.dev/en/blog/datacenter-location-pue-renewable https://federicocalo.dev/en/blog/datacenter-location-pue-renewable Sun, 14 Jun 2026 06:24:14 GMT Federico Calo Sustainable AI Where you train an AI model has a massive impact on energy efficiency. Learn how PUE, geographic location, and renewable energy mix determine the carbon footprint of machine learning. https://federicocalo.dev/en/blog/distillazione-modelli-energia https://federicocalo.dev/en/blog/distillazione-modelli-energia Sun, 14 Jun 2026 03:05:41 GMT Federico Calo Sustainable AI Articolo della serie Sustainable AI / Green Software 2027. Pubblicazione prevista 14 September 2027. https://federicocalo.dev/en/blog/green-software-foundation-patterns https://federicocalo.dev/en/blog/green-software-foundation-patterns Sat, 13 Jun 2026 23:47:09 GMT Federico Calo Sustainable AI Articolo della serie Sustainable AI / Green Software 2027. Pubblicazione prevista 13 September 2027. https://federicocalo.dev/en/blog/energy-efficient-llm-inference-2027 https://federicocalo.dev/en/blog/energy-efficient-llm-inference-2027 Sat, 13 Jun 2026 20:28:36 GMT Federico Calo Sustainable AI Articolo della serie Sustainable AI / Green Software 2027. Pubblicazione prevista 10 September 2027. https://federicocalo.dev/en/blog/carbon-footprint-ai-training https://federicocalo.dev/en/blog/carbon-footprint-ai-training Sat, 13 Jun 2026 17:10:04 GMT Federico Calo Sustainable AI Articolo della serie Sustainable AI / Green Software 2027. Pubblicazione prevista 09 September 2027. https://federicocalo.dev/en/blog/modern-data-stack-2027-mva https://federicocalo.dev/en/blog/modern-data-stack-2027-mva Sat, 13 Jun 2026 13:51:31 GMT Federico Calo Data Engineering 2027 Articolo della serie Data Engineering 2027 (DuckDB + Polars + lakeFS). Pubblicazione prevista 08 September 2027. https://federicocalo.dev/en/blog/iceberg-delta-hudi-decision-tree https://federicocalo.dev/en/blog/iceberg-delta-hudi-decision-tree Sat, 13 Jun 2026 10:32:59 GMT Federico Calo Data Engineering 2027 Article from the Data Engineering 2027 series (DuckDB + Polars + lakeFS). Comprehensive comparison of three lakehouse table formats. https://federicocalo.dev/en/blog/duckdb-polars-pipeline-lean-python https://federicocalo.dev/en/blog/duckdb-polars-pipeline-lean-python Sat, 13 Jun 2026 07:14:27 GMT Federico Calo Data Engineering 2027 DuckDB and Polars are the two main actors in the lean data revolution in Python. Discover how to combine them in efficient pipelines that minimize memory while maintaining extraordinary performance. https://federicocalo.dev/en/blog/lakefs-git-data-lake https://federicocalo.dev/en/blog/lakefs-git-data-lake Sat, 13 Jun 2026 03:55:54 GMT Federico Calo Data Engineering 2027 Articolo della serie Data Engineering 2027 (DuckDB + Polars + lakeFS). Pubblicazione prevista 03 September 2027. https://federicocalo.dev/en/blog/polars-vs-pandas-benchmark-2027 https://federicocalo.dev/en/blog/polars-vs-pandas-benchmark-2027 Sat, 13 Jun 2026 00:37:22 GMT Federico Calo Data Engineering 2027 Article from the Data Engineering 2027 series. Realistic performance benchmarks comparing Polars and Pandas on modern data engineering tasks. https://federicocalo.dev/en/blog/duckdb-produzione-alternative-spark https://federicocalo.dev/en/blog/duckdb-produzione-alternative-spark Fri, 12 Jun 2026 21:18:49 GMT Federico Calo Data Engineering 2027 Article from the Data Engineering 2027 series. DuckDB as a lightweight Spark alternative for OLAP analytics on datasets under 1TB. https://federicocalo.dev/en/blog/migrazione-cloud-local-first-roi https://federicocalo.dev/en/blog/migrazione-cloud-local-first-roi Fri, 12 Jun 2026 18:00:17 GMT Federico Calo Local-First Software Article from the Local-First Software Architecture series. Business case and ROI analysis for migrating from cloud-only to local-first architecture. https://federicocalo.dev/en/blog/replicache-reflect-typescript https://federicocalo.dev/en/blog/replicache-reflect-typescript Fri, 12 Jun 2026 14:41:45 GMT Federico Calo Local-First Software A practical guide to implementing a local-first architecture with Replicache for synchronization and Reflect for reactive state management. Discover how to build offline-first applications with automatic data binding and conflict resolution. https://federicocalo.dev/en/blog/electric-sql-postgres-local-first https://federicocalo.dev/en/blog/electric-sql-postgres-local-first Fri, 12 Jun 2026 11:23:12 GMT Federico Calo Local-First Software Article from the Local-First Software Architecture series. Building local-first applications with ElectricSQL and PostgreSQL synchronization. https://federicocalo.dev/en/blog/yjs-produzione-sync-server https://federicocalo.dev/en/blog/yjs-produzione-sync-server Fri, 12 Jun 2026 04:46:07 GMT Federico Calo Local-First Software Article from the Local-First Software Architecture series. Production-ready sync server design with Yjs, WebSocket, and database persistence. https://federicocalo.dev/en/blog/automerge-collaborative-editor https://federicocalo.dev/en/blog/automerge-collaborative-editor Fri, 12 Jun 2026 01:27:35 GMT Federico Calo Local-First Software Article from the Local-First Software Architecture series. Practical guide to building a real-time collaborative editor with Automerge and CRDT. https://federicocalo.dev/en/blog/pouchdb-couchdb-sync-multi-device https://federicocalo.dev/en/blog/pouchdb-couchdb-sync-multi-device Fri, 12 Jun 2026 00:00:00 GMT Federico Calo Local-First Software How to synchronize data in real-time across multiple devices using PouchDB and CouchDB. Complete guide with offline-first, conflict resolution, and multi-device architecture for local-first applications.