João Paulo Hildebrandt

Built piece by piece. Made to last.Built piece by piece. Made to last.

I'm João Paulo, a frontend-focused full-stack engineer based in Porto. I build React and TypeScript products, design systems and tested, accessible interfaces for teams like Hapimag, Betfair, Kantar and OLX.

Get in touch

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01TEAMS I'VE BUILT FOR

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Engagements through 99x, Aubay × Blip.pt (Flutter), Alter Solutions and Softo, plus Super Desenvolvedores, the venture I co-founded in Rio.

Switzerland · United Kingdom · Portugal · Brazil

02PARTS LIST

One board, ten parts, a whole machine.One board, ten parts, a whole machine.

A computer is a box of parts that each do one job and plug into a standard slot. I build interfaces the same way: small, well-tested components with clear APIs, composed into products that teams can keep growing without the machine overheating.

Fig. 1 · The same ten parts, put back together. Drag to turn it.

01FRONT PANEL
Interfaces
Product UI in React, TypeScript and Next.js: responsive, accessible (WCAG) and pleasant to use.
REACT · TYPESCRIPT · NEXT.JSREACT · TYPESCRIPT · NEXT.JS · TAILWIND
02MOTHERBOARD
Design systems
Storybook component libraries that keep teams consistent and ship UI faster.
STORYBOOK · RADIX UI · MATERIAL UI
03MEMORY
Testing
Unit, end-to-end, visual and regression tests that catch bugs before users do.
JEST · VITEST · PLAYWRIGHT · CYPRESS
04COOLER
Performance
Lean, fast interfaces: code splitting, prefetching on intent, fine-grained rendering.
REACT COMPILER · TANSTACK · VITE
05STORAGE
Full stack & migrations
APIs and data when the product needs them, and legacy moves without drama.APIs and data when the product needs them, and legacy moves without drama: PHP → NestJS, MySQL → PostgreSQL, Angular → React.
NODE.JS · NESTJS · POSTGRESQL · FASTAPI

Fig. 2 · The engineer. No exploded view available.

03SPECIFICATIONS

Grounded in Rio. Building in Porto.Grounded in Rio. Building in Porto.

My career started in Rio de Janeiro in 2018, as an apprentice at OLX: first automating audit spreadsheets, then building animated React panels that ranked the month's best support agents. Rio taught me to build from zero: I co-founded a small venture and led a fintech's move to a modern stack. Porto taught me to make things last: design systems, test suites and products that teams in Switzerland, the UK and Portugal keep growing.

I care about the parts nobody notices until they break: a component's API, the test that fails first, the page that stays fast on modest hardware. Give me ownership of a problem and I'll carry it from diagnosis to delivery, and leave the codebase easier for whoever comes next.

BASED IN: Porto, Portugal
LANGUAGES: Portuguese (native) · English (C1)

EDUCATION: B.Sc. Computer Information Systems at FIAP, 2019 to 2021
ALSO: ESL Communication Skills at Rice University, 2022 · Cisco IT Essentials

04BOOT SEQUENCE

I learned systems by taking them apart.I learned systems by taking them apart.

Before I wrote any code, I was opening computers and swapping their parts. It is still how I debug: find the part that fails, replace it, test again. Then one layer at a time: networks, the web, code, products, and now the models that write code with me.

~/joao/boot.log40 × 2480 × 24

[ post ]hardware[ post ]hardwareOKOK

[ 2011 ]microlins[ 2011 ]microlinsOKOK

[ 2017 ]step-it[ 2017 ]step-itOKOK

[ 2018 ]olx[ 2018 ]olxOKOK

[ 2019 ]fiap[ 2019 ]fiapOKOK

[ 2022 ]alter[ 2022 ]alterOKOK

[ now ]homelab[ now ]homelabOKOK

[ now ]cindelo[ now ]cindeloRUNNINGRUNNING

joao@porto ~ %open ~/setup

05REVISION HISTORY

Two coasts, one craft.

Since 2018: from Rio de Janeiro's classifieds and startups to remote teams across Europe. Most recent first.

Portugal

2022 → TODAY · REV. D–F

Made to last: systems, tests and teams across borders.

2025 → today
Switzerland · remoteSwitzerland · remote
Software Engineer
99x for Hapimag
Building a staff management platform from scratch for a Swiss company that runs resorts across Europe: React and TypeScript on the front, Python and FastAPI behind it, Contentful for content.Building a staff management platform from scratch for a Swiss company that runs resorts across Europe: React and TypeScript on the front, Python and FastAPI behind it, Contentful for content. Reusable components, performance, scalability and mentoring.
REACT · TYPESCRIPT · TANSTACK · FASTAPIREACT · TYPESCRIPT · TANSTACK · FASTAPI · CONTENTFUL
2023 → 2025
Portugal · remotePortugal · remote
Software Engineer
Aubay for Blip.pt · Betfair
Key frontend features for Betfair's sports betting platform, in React and React Native. Maintained a shared Storybook design system, covered by unit, E2E, visual and regression tests.Key frontend features for Betfair's sports betting platform, part of the Flutter group, in React and React Native. Maintained and scaled a shared Storybook design system and covered it with unit, E2E, visual and regression tests.
REACT · REACT NATIVE · STORYBOOKREACT · REACT NATIVE · TYPESCRIPT · STORYBOOK · PLAYWRIGHT
2022 → 2023
UK · remoteUnited Kingdom · remote
Software Engineer
Alter Solutions for Kantar XTEL
Modernized legacy systems, with Playwright tests inside Storybook and accessible (WCAG) features on Radix UI.Modernized legacy systems for a Kantar division, with Playwright end-to-end tests running inside Storybook and accessible (WCAG) features built on Radix UI.
REACT · RADIX UI · PLAYWRIGHTREACT · RADIX UI · STORYBOOK · PLAYWRIGHT

PORTO · 8,000 KM · RIOPORTO · ABOUT 8,000 KM OF ATLANTIC · RIO DE JANEIRO

Rio de Janeiro

2018 → 2022 · REV. A–C

Built piece by piece: from apprentice to co-founder.

2021 → 2022
Rio · remoteRio de Janeiro · remote
Full Stack Developer
Softo for Doare
For a fintech client: moved legacy PHP microservices into one NestJS API, rebuilt the data layer from MySQL to PostgreSQL, and single-handedly migrated the client app from Angular to React.For a fintech client: led the move of legacy PHP microservices into a single NestJS API, rebuilt the data layer from MySQL into a normalized PostgreSQL schema, and single-handedly migrated the client app from Angular to React. Shipped a Next.js micro frontend.
NESTJS · POSTGRESQL · REACT · NEXT.JS
2020 → 2023
Rio · remoteRio de Janeiro · remote
Co-founder & Full Stack Developer
Super Desenvolvedores
A venture to make tech education more accessible in Brazil, with finance tools and an e-commerce for tech lovers.A venture to make tech education more accessible in Brazil, with finance tools and an e-commerce for tech lovers. Responsive React interfaces for small businesses and for our own products.
REACT · NEXT.JS · NODE.JS · REDUX
2018 → 2020
Rio · on-siteRio de Janeiro · on-site
Apprentice → Intern
OLX Brasil
Joined through a national youth apprenticeship program. Automated audit spreadsheets, customized the Help Center, built animated React ranking panels.Joined through a national youth apprenticeship program. Automated the audit team's spreadsheets, customized the Help Center for UX and accessibility, and built animated React ranking panels.
REACT · AUTOMATIONREACT · AUTOMATION · ACCESSIBILITY

06LOGIC ANALYZER

React never goes low. The rest switch with the job.React never goes low. The rest switch with the job.

One channel per technology, grouped by kind. TIME holds a channel high for as long as I've used it; TEAMS lists the teams it shipped with.

~/joao/stack.vcd26 CH · 2018 → NOW

TIMETEAMS

Libraries
00React2018 → today
01TanStack Query2020 → today
02Redux2020 → 2025
03Zod2021 → today
04Radix UI2022 → today
05React Hook Form2022 → today
06TanStack Table2022 → today
07Material UI2022 → today
Frameworks
08Next.js2020 → today
09NestJS2021 → 2022
10Tailwind CSS2022 → today
11React Native2023 → 2025
12FastAPI2025 → today
Runtime & data
13PostgreSQL2018 → today
14Node.js2020 → today
15GraphQL2023 → 2025
16Contentful2025 → today
Testing & tooling
17Cypress2021 → today
18Playwright2022 → today
19Storybook2022 → today
20Jest2022 → today
21Vite2022 → today
22Vitest2025 → today
Languages
23JavaScript2018 → today
24TypeScript2020 → today
25Python2025 → today

Technologies by team, from 2018 to today
Libraries
	OLX	Super Dev	Doare	Kantar	Betfair	Hapimag
00React	Shipped	Shipped	Shipped	Shipped	Shipped	Shipped
01TanStack Query	Not used	Shipped	Not used	Not used	Not used	Shipped
02Redux	Not used	Shipped	Not used	Not used	Shipped	Not used
03Zod	Not used	Not used	Shipped	Not used	Not used	Shipped
04Radix UI	Not used	Not used	Not used	Shipped	Not used	Not used
05React Hook Form	Not used	Not used	Not used	Not used	Not used	Shipped
06TanStack Table	Not used	Not used	Not used	Not used	Not used	Shipped
07Material UI	Not used	Shipped	Shipped	Not used	Not used	Not used
Frameworks
08Next.js	Not used	Shipped	Shipped	Not used	Not used	Not used
09NestJS	Not used	Not used	Shipped	Not used	Not used	Not used
11React Native	Not used	Not used	Not used	Not used	Shipped	Not used
12FastAPI	Not used	Not used	Not used	Not used	Not used	Shipped
Runtime & data
13PostgreSQL	Not used	Not used	Shipped	Not used	Not used	Not used
14Node.js	Not used	Shipped	Shipped	Not used	Shipped	Not used
15GraphQL	Not used	Not used	Not used	Not used	Shipped	Not used
16Contentful	Not used	Not used	Not used	Not used	Not used	Shipped
Testing & tooling
17Cypress	Not used	Shipped	Not used	Not used	Not used	Not used
18Playwright	Not used	Not used	Not used	Shipped	Shipped	Shipped
19Storybook	Not used	Not used	Not used	Shipped	Shipped	Not used
20Jest	Not used	Shipped	Shipped	Shipped	Shipped	Not used
21Vite	Not used	Not used	Shipped	Not used	Not used	Shipped
Languages
23JavaScript	Shipped	Shipped	Shipped	Shipped	Shipped	Shipped
24TypeScript	Not used	Shipped	Shipped	Shipped	Shipped	Shipped
25Python	Not used	Not used	Not used	Not used	Not used	Shipped

ALSO ON THE BENCH

Tailwind CSS
Vitest

MEASUREMENTSΔ1ReactEvery team since 2018.Δ2NestJSRio: full stack, end to end. PHP, MySQL and Angular retired on the way.Δ3StorybookPortugal: design systems and their tests became the job.Δ4PythonNow: TypeScript in front, Python and FastAPI behind it.TIME: first to last year in use, at work or on my own projects. TEAMS: where it shipped.

07SUPPORT

Let's build something that lasts.Let's build something that lasts.

Tell me about your team, your product, or the problem you'd like solved.

Email me

LinkedIn GitHub

01TEAMS I'VE BUILT FOR

Interfaces

Design systems

Testing

Performance

Full stack & migrations

Portugal

Software Engineer

Software Engineer

Software Engineer

Rio de Janeiro

Full Stack Developer

Co-founder & Full Stack Developer

Apprentice → Intern

ALSO ON THE BENCH