Lisbon · building with AI daily

João Silvestre

Senior Lead Software Engineer at J.P. Morgan Workplace Solutions. Fifteen years of .NET, now building with AI agents as a daily colleague.

How I work with AI → Get in touch

📍 Lisbon

About

Backend engineer at heart.

Banking and payments systems, from SIBS to J.P. Morgan. I like boring, reliable software and the tooling around it. Lately that tooling includes agents.

Stack

C# .NET T-SQL ASP.NET Docker Tailwind Git

AI tooling

Claude Code Agentic workflows Opus & Sonnet Subagents Local models

AI workflow

I steer. The agents do the typing.

I guide, Claude learns and understands, and we iterate on the plan together. That is where the work is. Then it implements and we validate.

01learn02understand03plan04implement05validate

Read the full breakdown →

$ work "revamp my website"
✓ learn      repo facts, cited
✓ understand every open question answered
✓ plan       batches, checks written first
▸ approve?   waiting for a human…
· implement  cheap models first
· validate   independent agent, same checks

Projects

psychology-tools

WISC-III evaluation tool

Automates psychology test scoring and reports for practitioners.

ReactASP.NETPWA

f1 experience

F1 experience

A side project for Formula 1 data and fun.

.NETData

Writing

2023 · 12 min

How do CPUs work? Part 1

From transistors to instructions.

2023 · 14 min

How do CPUs work? Part 2

Pipelines, caches and why they matter.

Let's build something.

Find me on GitHub or LinkedIn.

GitHub LinkedIn