Florianópolis, Brazil. Fully remote, UTC−3.
Senior full-stack engineer. Built for AI products and every layer beneath.
I turn complex product requirements into software people use. Ten years shipping web products, owning architecture through release, and leading teams of up to seven.
Open to senior and staff opportunities.
Experience, in production.
The products, platforms and teams behind the work. Follow an engagement into the decisions and what shipped.
Professional experience
2024–presentFull-time
Owned architecture end to end and led a team of seven through a ground-up platform rewrite: AI assistant, domain events, hybrid search, background-job platform, integrations, billing, evals and CI/CD.
Read the DealMerge case study2021–2023Full-time
Predactiv (ShareThis)
Lead Full-stack Engineer
Remote (US)
Joined as the sole frontend developer and grew the team to three. Refactored a large legacy React and Node.js codebase, built a slide-generation platform with native PowerPoint export, an audience management platform and large-dataset exploration tools, and early AI-assisted analytics on the OpenAI APIs.
2018–2021Full-time
Jungle Devs
Software Engineer
Florianópolis, Brazil
Led the agency’s largest project, an adtech data-visualization system, with a team of six. Rotated across a real estate SaaS, contactless car test drives during COVID-19, a mentoring platform and IoT beverage machines. Mentored three developers.
2016–2018Full-time
BrasilRad
Systems Analyst
Florianópolis, Brazil
Built a hybrid Android app for medical-physics field data collection that made the field team more than three times as productive, automated quality-control reporting, led a hospital department management app, and wrote the company IT master plan.
Contract engagements
2026–presentContract
Governed reference-data projection from the warehouse, a hardened legacy migration with audit-based release gates, authorization hardening, sequence-search indexing and the team’s developer tooling. Staff scope on the path to production.
Read the data platform case study2025–2026Contract
Citation tracking across answer engines, a streaming strategy agent, the multi-provider AI layer, durable interview workflows, and real-time voice and screen-share AI.
Read the SearchParty case study2025Contract
Entire product solo: dependency-graph generation orchestration, a 14-stage financial engine, multi-format export, localisation and payments.
Read the BusinessPlan.ai case study2022–2025Contract
Embeddable import widget, headless Lambda import pipeline, cost-tiered AI column matching, no-code schema builder and the customer dashboard rewrite.
Read the Dromo case study
Across the whole platform.
From a useful interface to reliable background work. I connect the layers and own the path to release.
AI product engineering
AI features people can use in production: assistants that take action with permission, search grounded in relevant data, streaming interfaces, and evaluations that check behavior before release.
Vercel AI SDK, Claude Agent SDK, OpenAI Realtime API, AI Gateway, Claude Code
Durable workflows and background jobs
Document generation, imports and background work that can recover from failure. Durable steps, targeted retries and concurrency controls keep long-running processes moving without duplicating work.
Trigger.dev, Vercel Workflow DevKit, Inngest, AWS Lambda
Platform and monorepo architecture
A foundation a team can extend: clear package boundaries, shared services, permissions and reliable domain events. I lead platform rewrites and document the decisions behind the architecture.
TypeScript, Next.js, React, tRPC, Drizzle, Effect-TS, Turborepo
Data, search and pipelines
Turn messy data into useful products. Governed data pipelines, migrations with reconciliation checks, spreadsheet imports with human review, and search that combines keywords with meaning.
PostgreSQL, pgvector, Snowflake, Redis, Typesense, Python, FastAPI, SQLAlchemy
Real-time and multimodal
Responsive experiences across voice, screen sharing and live data. I build real-time AI interactions and streaming interfaces that handle interruptions and keep people informed.
WebRTC, SSE, Ably, Web Workers, OpenAI Realtime
Delivery, quality and leadership
Lead the work through release: architecture, mentoring, automated checks, migration rehearsal and observability. I have led teams of up to seven and a platform through a third-party security assessment.
GitHub Actions, GitLab CI, Playwright, Vitest, Sentry, PostHog, Docker
Claude Code is part of my daily engineering workflow, alongside review, tests and production checks.
Ways to work together.
Remote from Brazil, working in English with international teams since 2018.
Full-time remote role
Senior or staff scope: own a product area, shape the architecture and help a team ship. International engagement through my Brazilian company.
Contract engagement
Build an AI product, lead a platform rewrite or deliver a defined piece of engineering work. Agree the scope and working hours together.
Technical consulting
A focused architecture review, an AI workflow assessment or a practical plan for a difficult migration. Decisions your team can act on.
Independent work.
Small products and shared foundations I build outside client work.
Mononono
A shared foundation for independent products: reusable packages, enforced architecture boundaries and documented decisions.
TypeScript, Turborepo, Drizzle, Neon PostgreSQL
Parlor
Mental math training with prerequisite-based skill trees, a spaced-repetition scheduler and a gamified progression layer.
Next.js, React, Tailwind CSS
Truco Marker
Real-time multiplayer score tracker for the Brazilian card game Truco: room-based sync over SSE with a polling fallback, optimistic UI with server reconciliation, and Web Audio synthesis.
Next.js, SQLite, Drizzle ORM
HabitMint
Self-hosted habit tracker with a reward-currency gamification system and a contribution-style activity chart.
Next.js, SQLite
Let’s build something useful.
Tell me about the role or product, the challenge you need help with, and your team's timezone. We can start with a short conversation.
lucasflorianomuller@gmail.comOpen to senior and staff roles, contract engagements and consulting. Fully remote from Brazil.
UTC−3. Daily overlap with US and European teams, with working hours agreed together.