Lucas Nunes Joaquim lukasnunesj

`01 / whoami`

name      Lucas Nunes Joaquim
role      Full-stack Software Developer
focus     Backend · C# / .NET · TypeScript
since     2015, professionally
location  Countryside of São Paulo, Brazil

I've worked on enterprise systems and products: APIs, distributed services, integrations, and moving more data than anyone wants to inspect by hand. Lately I lean toward backend work, especially C# / .NET, Node.js and TypeScript.

This is also where the smaller, stranger ideas end up. Not everything needs a business case.

`02 / toolbelt`

Where	What I reach for
Core	C# / .NET · TypeScript · Node.js · PostgreSQL
Interfaces	React · Angular · Vue
Infra	Azure · AWS · Docker · GitHub Actions · observability

Other tools I've worked with

Java, Ruby on Rails, PHP / Laravel, Python, SQL Server, MySQL, Redis, and Azure DevOps.

Depending on the system: event-driven architecture, messaging, DDD, CQRS, Clean Architecture, and TDD. Tools for a problem, not a checklist for every project.

`03 / things I've built`

prisma

Personal finance dashboard. ASP.NET Core 8 API with EF Core and PostgreSQL, JWT with refresh-token rotation and CSRF protection, per-user data isolation, integration tests and CI. React frontend.

_{C# / .NET 8 · auth · integration tests · CI}

api-holerite

Payslip estimator. ASP.NET Core 8 API applying the 2026 INSS and IRRF rules, including the Lei 15.270 reduction, checked against the Receita Federal's official examples. Built for a real person, deployed on Fly.io.

_{C# / .NET 8 · xUnit · CI/CD}

react-holerite

The frontend for api-holerite: enter salary, extra hours and deductions and see the estimated payslip. Live demo.

_{React · Vite · Tailwind · Jest · Fly.io}

More experiments, prototypes, and things I wanted to understand ↗

`04 / soundtrack`

Rock, alternative rock, nu-metal. Probably a reasonable amount of Linkin Park. Probably.

_{A listening snapshot, not a live player. Refreshes every 30 minutes once connected.}

`05 / outside the terminal`

Games: Outer Wilds, Tunic, Hollow Knight. Exploration, secrets, and finding out what that door was hiding.
Stories: anime, manga, manhwa, and webnovels. Shadow Slave and Lord of the Mysteries fit the lore rabbit hole nicely.
Experiments: new tools, AI-assisted development, little automations, and interfaces that are fun to look at.

`06 / public signals`

_{Public experiments aren't a complete picture of my professional stack. A lot of the day job stays private.}

The contribution graph has a small predator.

Say hello: LinkedIn · Email · GitHub

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