I build digital products people love to use.
Senior Full Stack Engineer with 15+ years building high-impact SaaS products with React, Next.js, TypeScript and Node.js. I care about great UX, clean code and high-performing teams.
15+
Years of experience
30%
Faster feature delivery
20%
Infra cost reduction
5K+
Institutions impacted
Experience highlights
Flecto
Lead Frontend Engineer
Sep 2023 – Jun 2026·Lisbon / Porto Alegre (Remote)
Delivered the frontend architecture for a multi-tenant SaaS platform and built an online store engine from scratch with React & Next.js. Cut build time by 40%.
mollie
Full Stack Engineer
Jun 2022 – Jul 2023·Lisbon, Portugal
Improved security workflow adoption by 10% and built a shared backend-for-frontend layer that accelerated feature delivery by 30%.
wwarren
Engineering Lead
Dec 2020 – Apr 2022·Florianópolis, Brazil
Led a team of 6 engineers to build a private pension platform with $60M AUM and raised delivery throughput by 35%.
Core Expertise
The stack I build with
Frontend
ReactNext.jsTypeScriptZustandTanStack QueryStorybookCSS Modules
Backend
Node.jsNestJSExpressREST APIsMicroservicesPrismaTypeORM
AI
ClaudeClaude CodeCodexSkillsMCPRAGHarnessAI Agents
Leadership
MentoringEngineering GuidelinesProduct CollaborationGrowth Framework
Architecture & DX
MonoreposTurborepoSystem DesignCI/CDPNPMEngineering DX
Data & Cloud
PostgreSQLMySQLMongoDBRedisAWSGCPVercelDocker
Projects
Things I've built
Web app
MovieShelf
A web app to browse, discover and keep track of movies and TV shows — powered by the TMDB API.
ReactNext.jsTypeScript
movieshelf.app
Open source
TMDB TypeScript Library
A fully-typed TypeScript client for The Movie Database (TMDB) API, built for a great developer experience.
TypeScriptNode.js
github.com/leandrowkz/tmdb
Contact
Let's build something people love.
Currently available for new opportunities. The fastest way to reach me is a quick email.
Based in Brazil · GMT-3+55 51 991 777 945Portuguese · English · Spanish