About
Walber Fellipe
Full-stack engineer with 6+ years shipping products end-to-end—currently leading engineering at Diagonal, with a strong focus on AI-assisted products and platform architecture, from discovery through production metrics.
I bridge strategy and execution—shipping reliable software while helping teams grow. I care about clear architecture, measurable outcomes, and honest trade-offs when complexity shows up.
Recent work spans marketplaces and portals (e.g. Cibus, Chevrolet seminovos), GIS-heavy public-sector platforms (Regulariza.ai), mobile and web at scale (Strings Brasil), and automation around data pipelines and Slack reporting.
Experience & impact
- Diagonal — Leading high-performance engineering teams; delivering architectural work across client products.
- Scale & reliability — Infrastructure and optimizations supporting 15k+ concurrent users (Strings Brasil) and 20k+ users impacted through Cibus platform work.
- AI engineering — LLM integrations, agentic workflows, RAG, evaluation, and guardrails; currently deepening applied AI through formal coursework (generative APIs, orchestration, observability, multimodal foundations).
How I work
TypeScript-first backends (Node, NestJS, Express), React and Next.js on the frontend, Postgres and pragmatic ORMs, AWS building blocks (S3, Cognito), queues when workloads need it, and observability so production stays boring—in a good way.