Senior fullstack engineer · Fortaleza, Brazil
I work across the stack: React and TypeScript on the front, Node, Python and Go behind it, AWS underneath. Lately that means breaking a monolith into services, moving an API edge to AWS, and rebuilding a legacy back office in React. The projects below are mine end to end, tested and documented.
Feature flags for several tenants at once: targeting rules, percentage rollouts per environment, roles that really restrict things, and an audit trail of who changed what.
The evaluation engine never throws. A broken config degrades to the off variant, and the strictness lives on the write side instead.
A realtime board for retros and brainstorms: sticky notes, votes and live cursors for everyone with the link. People write in private first, then the board is revealed and the result exports as markdown.
No CRDT library. Every change is an op, the server orders them, and each client replays its own unconfirmed ops on top of the confirmed state, so edits show up instantly and survive a dropped connection.
Maintenance checklists that work with no signal. A technician walks a plant, reads gauges, flags issues and takes photos; everything is kept on the phone and synced when there is a connection.
When two phones edit the same round offline, a three-way merge takes what only one side changed and asks the person about the rest, instead of letting a timestamp pick a winner.
Ask the TanStack Query docs a question and get a streamed answer where every claim links to the exact lines it came from. When the docs do not say, it says so instead of guessing.
Retrieval is measured, not assumed: an eval set of 41 questions with known sources took recall@5 from 0.66 with keyword search to 0.90 with hybrid search and a local reranker.
A refactor toolkit for legacy backends, built as a Claude Code plugin. It migrates a fictional 2014-style Express API to a NestJS service route by route, behind a proxy with shadow mode, and three of its eleven routes are already migrated.
A route can only flip to the new service when replayed legacy traffic matches, and hooks enforce that: the agent cannot edit the legacy code, and every rule in a plan cites the legacy lines a local search index found.
Webhook delivery as a service: accept events, fan them out to subscriber endpoints, sign every request, retry with backoff, dead-letter what never lands, and show each attempt on a timeline.
A Postgres queue on SELECT … FOR UPDATE SKIP LOCKED with leases, so a crashed worker’s deliveries come back on their own; the same interface runs on SQS in the AWS deployment.
An uptime monitor in one Go binary: HTTP, TCP, DNS and certificate checks on a schedule, incidents that open and resolve on their own, and a public status page with 90 days of history.
Uptime is weighted by time, not by probe count, so a burst of fast failures cannot outweigh hours of history, and a restart replays recent results instead of forgetting a failure streak.
Product analytics for a made-up SaaS: KPIs with deltas, events over time, an event explorer, weekly retention cohorts and funnels, over 300 thousand seeded events.
Every number is a SQL aggregate and every chart is drawn by hand in SVG; the explorer pages through events by cursor and streams CSV exports one page at a time.
Software consultancy
A consultancy that builds and modernizes software for US companies. I work on client teams, across the stack.
Ticketing and fundraising software used by universities and venues across the United States.
A California marketplace for cannabis products, where a chat helps each customer find the right product for what they need.
Fed byCatalogStrapi · Shopify
Credit app for CLT and INSS workers
A Brazilian fintech where people simulate and take FGTS advances, payroll loans and credit cards from their phone, without a branch or a phone call. Rated 4.2 by 39 thousand people on the App Store.
GreenMile Live, now Descartes GreenMile
A cloud platform for route planning and live tracking of deliveries, used by drivers, dispatchers and supervisors.
Grupo de Comunicação O POVO
A newspaper and media group in Fortaleza. My first engineering job.
NGOs post incidents and people help: Express and SQLite API, React web app, an Expo client. An OmniStack week project, brought to current Node and Vite with tests.
JavaScript · Sep 2026
A bank dashboard from a hiring challenge: login, transactions, a two-step payroll wizard, all against a mocked API.
TypeScript · Oct 2026
Hiring test: look up a GitHub user, put their location on a map, list what they starred. React with Testing Library.
JavaScript · Sep 2026
A blog on Next.js and Prismic from a Rocketseat Ignite challenge, statically generated, with reading time. Runs on fixtures without an account.
TypeScript · Sep 2026
A shopping cart with stock checks and persistence, from a Rocketseat challenge: moved to Vite and React 19, 23 tests.
TypeScript · Sep 2026
A choropleth of Ceará in plain SVG and JavaScript: color the municipalities from a JSON file, get a legend for free.
HTML · Sep 2026
Earlier work from bootcamps and courses stays on the repositories page, unedited. It shows where I started.
Open to senior fullstack roles, remote or in Fortaleza. The quickest way is email: arturbrunoferreira@gmail.com, or on LinkedIn.
