From Brief to Product — Custom Software
For the founder starting from scratch and the company wanting to evolve. No upfront price: tell me about your project and get a tailored quote.
For whom is this service
Work with founders starting from scratch and teams that want to evolve.
From Brief to Product
Work with early-stage founders who have an idea and want to validate it in production, and with established teams that need to evolve an existing system.
Production stack
Angular SSR, Spring Boot Clean Architecture, FastAPI RAG: technologies I use in production, not in tutorials. Code that scales and maintains.
Direct communication
Single point of contact from analysis to deployment. No account manager: you always speak with the code writer.
Verifiable Quality
Automated tests, technical documentation, and clean architecture as part of the deliverables — not optional paid features.
AI analysis for PMI on-premises
AI Document Analyzers —verbatim quoting— all data stays in Europe (Hetzner NBG1), no cloud.
Privacy by design — data in EU
The document remains in memory only during analysis (retention=0). No data written to disk, database, or logs. Compliant with GDPR Art. 9.
AI fully on-premises
Llama3.1:8b model on Hetzner VPS NBG1 — no cloud transfer. Zero cost, local latency, full control.
Verifiable direct quote
Each extracted claim includes the exact quote from the document + position + confidence. No inference, just auditable extraction.
360° services catalog
From MVP to automation, from web to machine learning. If you don't find your exact case, write to me anyway — I work custom.
MVP & Digital Product Creation
From concept to production-ready product. Scalable architecture, fast release.
Full-stack web development (SSR)
Sites and web apps with Angular SSR and Spring Boot. Lighthouse performance 90+, optimal SEO.
Custom software
Management systems, internal tools, specific integrations. No template: designed for your domain.
SEO Analysis & Optimization
Technical audit, structured data, Core Web Vitals, content strategy. Measurable results.
Automations & integrations (API/workflows)
Automated workflows, data pipelines, heterogeneous system integration via REST/webhooks.
Data & Machine Learning / AI (RAG on-prem)
On-prem Ollama RAG, semantic embeddings, vector search Redis. Vendor-agnostic AI.
Mobile app / PWA
Progressive Web App and mobile app with Angular. Single codebase, native experience.
DevOps / deploy / infrastructure
Setup VPS Hetzner, Nginx, systemd, SSL, CI/CD. Robust infrastructure without excessive cloud costs.
Performance & Accessibility (CWV/WCAG)
Core Web Vitals Optimization, WCAG 2.2 AA. Fast, accessible, compatible sites.
Legacy migration / modernization
From PHP/jQuery to Angular SSR, from monolith to microservices. Incremental migration without big bang.
Technical writing & documentation
ADR, runbook, API doc, user guides. Documentation as part of the deliverables, not an extra.
Technical & Architectural Consultation
Code review, architectural decision, team onboarding. One-time or ongoing support.
Computer Science Tutoring (middle/high school)
Personalised lessons: theory (algorithms, flowcharts, logic) and practice (Java, C, C++, HTML, CSS), with direct-contact CTA.
Found what you were looking for?
How it works
A clear process, no surprises.
Brief & Discovery
Understand context, goals, and technical/business constraints
Analysis & Proposal
High-level architecture, recommended stack, estimated times and costs. Document to be reviewed together.
Iterative development
Short sprints, continuous demos, fast feedback. Automated tests from day one.
Deploy & support
Release to production, operational documentation, handover, or continuous support.
federicocalo.dev — mono-repo microservices AI-native
This is the portfolio you are visiting: designed, developed, and deployed independently. Production-grade architecture reflecting the stack used in consulting.
- Stack
- Angular 21 SSR · Spring Boot 3.4 · FastAPI 3.12 · PostgreSQL 16 · Redis Stack 7
- Contents
- 702 IT items · 512 dev tools · 18 languages supported · 69 series
- Test
- 371 backend tests (unit + integration Testcontainers) · 120 ML tests · 0 failures
- Performance
- SSR prerender 1014 routes · Lighthouse 90+ · Core Web Vitals green
- Security
- JWT HS256 owner · Bucket4j rate limit · Resilience4j circuit breaker · SSRF guard
- AI
- RAG with sentence-transformers + cross-encoder re-rank · Ollama on-prem VPS (llama3.1:8b), primary provider
Frequently asked questions
- How does the quotation process work?
- Fill out the form with a project description. I usually respond within 1-2 business days with follow-up questions or an initial proposal. There is no commitment.
- Work remotely or in person?
- Work primarily remote (full-remote). Local presence for projects in the Bari/Puglia area is negotiable.
- What type of project is best?
- I work well on projects with a clear technical goal: a web app, an API integration, SEO optimization, a ML system. There is no fixed minimum or maximum budget — it depends on the scope.
- Provide post-release support too?
- Yes. I can agree on a support plan or continuous maintenance. Alternatively, I deliver detailed operational documentation for your internal team.
- What is your main tech stack?
- Angular 21 SSR, Spring Boot 3.4 Clean Architecture, FastAPI with RAG Ollama on-prem, PostgreSQL 16, Redis Stack 7. Infrastructure on Hetzner VPS with Nginx.
- Can I see examples of your work?
- This portfolio (federicocalo.dev) is the most complete case study. The code and documentation are public on GitHub. I can show specific details in a call.
Still unsure?
Let's talk about your project
Fill out the form and get a customized quote within 1-2 business days.