Open to work
Leo Martins
Product Engineer
- Full-Stack Developer
- Design Engineer
I turn fuzzy product ideas into polished, fast web apps — from the database schema to the last micro-interaction.
Based in
São Paulo, Brazil
About
Full-stack product engineer with six years at start-ups and scale-ups. I sit between design and engineering: prototyping in Figma, shipping in React and Node, and measuring whether it worked. Recently I led the rebuild of a fintech onboarding flow that lifted activation by 34%.
6 yrs
Experience
14
Products shipped
+34%
Activation lift
Selected work
A calm personal-finance app that categorises spending automatically and explains it in plain words.
- Next.js
- TypeScript
- PostgreSQL
- Stripe
A plugin that syncs design tokens from Figma to code in one click.
- TypeScript
- Figma API
- Style Dictionary
Experience
- Rebuilt onboarding end to end, lifting activation from 41% to 55%
- Created the design system used by five product squads
- Run weekly experiments with product and data teams
- Shipped web apps for 20+ clients in React, Next.js and Node
- Introduced end-to-end testing that halved production bugs
Education
- 2018
B.Sc. in Information Systems
University of São Paulo
Skills
Frontend
- React
- Next.js
- TypeScript
- Tailwind CSS
- Framer Motion
Backend
- Node.js
- PostgreSQL
- Prisma
- tRPC
Product
- Figma
- Prototyping
- A/B testing
- Analytics
Publications
Product conference talk
Designing Onboarding That Explains Itself
Lessons from rebuilding a fintech onboarding flow with progressive disclosure and instant feedback.
+34%activation lift
- Product design
- Onboarding
- Fintech
Engineering blog
Design Tokens at Scale
How one source of truth for colour, spacing and type kept five squads visually consistent.
5squads on one system
- Design systems
- Front-end
Videos
Featured video
Example video from YouTube. Add your own talks, product demos or reels here.
Another example
Every theme shows videos with a lightweight click-to-play player.
Process
Understand the job
What is the user really trying to get done? Start there.
Prototype fast
A clickable prototype on day two beats a spec on day ten.
Build the real thing
Typed end to end, tested where it matters, fast by default.
Measure and iterate
Ship behind a flag, watch the numbers, improve.
Gallery
Contact