João
Rui
Software engineer building on AWS. Java and Spring Boot, TypeScript, event streaming — and lately, teaching machines to follow instructions.
Click the stream to publish a message.
Perfectionist with a sense of what ships.
I've worked as a full-stack developer, cloud engineer, backend engineer and platform engineer — in start-ups and inside some of the biggest betting and entertainment companies in the world. I like correctness, and I like it more when it arrives on time.
Today I work on messaging infrastructure at Flutter Entertainment, connecting brands across continents at 2.5 million messages a second. Based in Europe, working remotely.
- MEng Cybersecurity & Networks, University of Minho
- 4 certifications: AWS Cloud Practitioner, Developer, Solutions Architect; Apache Pulsar Developer
Where I've been moving things.
What I reach for.
Prompt lab: same task, three prompts.
Prompt engineering is mostly specification writing. Pick a prompt and watch how the answer changes.
Prompt
Answer
Recent builds.
- PulsarViewer A lightweight desktop app to explore Apache Pulsar. Saved connections, TLS, Protobuf decoding, live message streaming, publishing. Go backend, web UI; macOS, Windows, Linux and Docker.
- Salarial.PT Pay transparency for Portugal, aligned with EU Directive 2023/970. Upload payslips, get them validated, then compare salary bands by company and role.
- Retro A team retrospective app that signs in with GitHub. Nothing is stored on a server; your token lives only in your browser.
Latest on GitHub.
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Let's talk.
Hiring, a project, or an interesting stream problem. Pick a slot that fits my calendar, or message me.