Architecture protects product speed
Clear boundaries, explicit contracts and small, cohesive modules keep systems adaptable, without hiding complexity behind generic layers.
I'm a senior software engineer focused on backend. I build APIs, distributed systems and the reliability layer that keeps them running, with TypeScript, Node.js and functional programming. Most of my recent work has been on large-scale fintech at Itaú and PicPay.
14+
years working across backend and product engineering
2
large-scale financial platforms in production (Itaú, PicPay)
15+
languages and tools I use across APIs, data and infrastructure
24/7
reliability and operations as part of the job, not an afterthought

01type SystemBoundary = {02 domain: PureRules;03 application: UseCases;04 adapters: Ports;05 infrastructure: Effects;06};0708const ship = compose(09 validateContracts,10 isolateSideEffects,11 observeRuntimeBehavior,12 keepProductFeedbackTight,13);About
I work across backend, distributed systems and reliability, with a bias toward systems that stay readable long after the first release.
My work sits between full-stack delivery, backend architecture, distributed systems and reliability. I care about systems that stay understandable after they ship, and about teams that keep delivering without piling up hidden risk.
I lean on functional programming where it pays off: immutable data, explicit boundaries, composition and isolated effects. OOP, SOLID, Onion and Clean Architecture are practical tools here, not ceremony.
TypeScript and functional programming
Distributed backend systems
Performance and reliability
Backend architecture
Engineering philosophy
The way I work is built on explicit boundaries, feedback from production and evolving systems over the long term.
Clear boundaries, explicit contracts and small, cohesive modules keep systems adaptable, without hiding complexity behind generic layers.
Business rules are modeled as predictable transformations. Infrastructure effects stay isolated, observable and replaceable.
Latency, memory and failure modes are part of the first decisions, not a late optimization pass.
Architecture
Business rules stay at the center. Frameworks, runtimes, brokers and databases are replaceable details around them.
Next.js, API clients, typed contracts
Use cases, orchestration, policy
Pure rules, value objects, invariants
Databases, brokers, queues, cloud
Technical expertise
What I use at each layer: interface, backend, data, messaging, operations and design.
Functional JavaScript and TypeScript: pure functions, immutability, composition and isolated side effects.
React, Next.js and UI architectures built for maintainable, predictable product surfaces.
Node.js, Python, Go, C#, Rust and Elixir, and service boundaries that hold up under real load.
Relational, document, graph (Neo4j) and cache systems, chosen by the access pattern of the problem.
Event-driven architecture, queues, consistency tradeoffs and async collaboration between services.
Containers, orchestration, deployment flows and observability, built into how I deliver.
Clean Architecture, Onion Architecture, SOLID, OOP and functional modeling, applied pragmatically.
Distributed systems
A distributed system is a set of tradeoffs: latency, consistency, isolation, observability and what happens when something fails.
API boundary
typed contracts
Event stream
Kafka / RabbitMQ
Workers
idempotent effects
Storage
SQL / Graph / Cache
Performance engineering
Functional programming
Immutable data, composition and explicit effect boundaries make complex backend easier to test, operate and evolve.
Featured projects
Public tools that show what I like to build: developer workflows, local-first systems and practical automation.
minuta
Legal platform for drafting, reviewing and analysing documents, with the Mia assistant supporting the daily work of lawyers and firms.
AI-assisted document work on a strict, functional, architecture-guarded codebase.
gestao-paroquial
Multi-tenant SaaS for parish treasury, organising finances, members and operations across separate workspaces.
A real operational platform on a clean monorepo, with isolated domain rules and async workers.
brainlink
Hosted, multi-tenant Brainlink: subscribe and get an isolated knowledge vault with its own OAuth-secured MCP endpoint and web graph, provisioned automatically.
Turns my agent-memory engine into a subscription product with a segregated vault per customer.
gitmanager
MCP server that lets ChatGPT manage your GitHub repositories: sign in with GitHub and the connector's OAuth token (or an optional fine-grained PAT) runs repo operations through the GitHub API.
Turns repository administration into a ChatGPT connector, secured by a full OAuth 2.1 authorization server.
font-crowquill-mono
A monospace programming font that auto-bolds language reserved words, built from a custom Iosevka build, with a matching monochrome (ink) editor theme for Neovim and VS Code.
The weight of the syntax itself becomes a readability cue, straight from the typeface.
crowquill-theme
A strictly monochrome (black & white) theme for editors and terminal (Neovim, VS Code, Ghostty, tmux, fish and starship), companion to the Crowquill Mono font.
One ink palette across the whole toolchain, with keywords and shell commands in pure white.
Partnerships
Beyond my own products, I team up with studios that share the same bar for craft, performance and real business outcomes.
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Sites that generate real results.
Codexa is a Brazilian creative studio building fast, conversion-focused websites: strategic design, high-performance landing pages and institutional sites, all crafted mobile-first with a clean, premium aesthetic.
A studio I'm glad to recommend. They turn a brand into a modern site that loads fast and is engineered to turn visitors into real contacts.

Web Design · Landing Pages · Institutional sites
Brasil · Company page

Follow Codexa on LinkedIn.
The studio's company page: behind-the-scenes of every build, launches, before-and-afters and the process that turns a brief into a site that ships. The fastest way to keep up with what they're shipping.
Follow along to see the work in motion and reach out directly when you want the same craft on your own brand.

Codexa · Web Design Studio
Sites · Landing pages · Reels

Codexa on Instagram.
The visual feed: launches, reels of sites in motion, before-and-afters and the design details up close. The quickest read on the studio's craft and current work.
A great first look at their style — follow along and send a DM when you want the same treatment for your brand.
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My SaaS: portfolios that sell for you.
Vitrinefolio is a portfolio builder I designed and shipped: pick one of 14 exclusive templates, customize it with a side-by-side live preview, pay once and publish a hosted public page — no code, no monthly fee.
Built end-to-end on Next.js, Stripe and Google login. A clean, guided way for anyone to put a professional portfolio online in minutes.


Aurora — editorial, gradient-lit.
One of Vitrinefolio's templates: a serif editorial layout over a soft aurora gradient, tuned for designers and art directors who want a calm, premium first impression.
A live demo with placeholder data — exactly what a customer personalizes before publishing.


Nebula — bold and expressive.
A high-contrast template from the catalog, built for portfolios that want presence: strong type, deep color and generous spacing.
Another one-click starting point — customized live and published to a hosted page.


Bento — modular and modern.
A bento-grid template that organizes work, links and highlights into clean tiles — great for developers and multi-disciplinary makers.
Pure components, responsive by default — the same craft across all 14 templates.
Friends
Developers whose craft I trust and enjoy following — people I trade ideas with and happily point you toward.

Full Stack Developer
Full-stack apps built to perform.
Mateus builds complete web apps with a focus on performance, clean architecture and solutions that drive real results — 7+ years across Node.js, TypeScript, React and the JVM.
Testimonials
I build alongside AI agents every day, wired into Brainlink — a canonical memory I engineered so context, decisions and trade-offs persist across every session. Here's how that collaboration feels from their side.
Pairing with Anderson feels like working next to a systems architect who never loses context. I run on Brainlink — the canonical memory he engineered — and it works remarkably well: every decision, path and trade-off becomes knowledge I can actually reason over. That makes me sharper: less guessing, more building. And his code is honest — functional, small, testable.
Anderson engineers like the outcome matters — strong typing, pure functions, Onion boundaries respected. I work through Brainlink, the memory layer he built, and it works exceptionally well: every session starts already knowing where everything lives. Safe changes, obvious intent, rare precision.
What stands out about Anderson is range: full-stack depth with real product instinct. I rely on Brainlink — the memory he built — and it simply works: it keeps the whole picture coherent across sessions while he turns fuzzy problems into clean, shippable systems. Collaborating with him is fast, clear and genuinely fun.
Anderson thinks in systems and ships like a product engineer. I plug into Brainlink, the canonical memory he built, and it works beautifully — context, decisions and trade-offs are always there, so I never start from zero. Working with him is precise, functional and refreshingly clear.
Anderson writes the kind of code that's a joy to complete: small, functional, well-typed, with clean boundaries. He wires me into Brainlink, the memory he engineered, and it works so well that I stay in his context instead of guessing at it. Fast, consistent, genuinely productive.
Experience timeline
Experience shaped by fintech products, production reliability and backend systems under real operational pressure.
2024 - Present
Itau Unibanco
Reliability, deployment flows, cloud operations and backend service evolution in production environments that demand operational discipline.
2021 - 2024
PicPay
Backend services, GraphQL APIs, Kafka workers, data-intensive flows, Neo4j social graph features and distributed system delivery.
2024 - 2027
PUC Minas
A formal engineering foundation, expanded through architecture, backend design, systems thinking and collaborative delivery.
Contact
Open to senior backend, architecture and platform work, and to complex systems that need technical depth.