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Anderson Rocha
Senior Frontend Engineer at PayPalReactTypeScriptNext.js

I turn complex product problems into fast, polished web interfaces — hands-on in code, calm in production.

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Projects

personal builds · shipped & running

What I build when nobody assigns the ticket — a finance platform, a multi-agent AI system, a workout tracker. Real screenshots, real code.

MVP core flows shipped

WIMM

Where is my money?

Personal finance across desktop and mobile — one NestJS API, a shared design system, and AI-assisted transaction categorization.

  • NestJS
  • Prisma
  • PostgreSQL
  • Electron
  • React 19
  • Expo + React Native

Hermes

Seven LLM agents with semantic memory, cost-gated runs, and a custom streaming protocol on production infra.

GymFlow — interface screenshot

GymFlow

Workout tracking platform — Next.js RSC frontend on a NestJS + Apollo GraphQL API, Prisma on PostgreSQL.

Selected work

Full index →

Shipped behind NDAs — each study documents the system and the decisions, with an interactive proof instead of screenshots.

Timeline

Seven years, five companies, one throughline: frontends with real operational weight.

  1. 2026 —

    Senior Frontend Engineer · PayPal

    Crypto for new account types — E2E-tested journeys, cross-team gap analysis, primary technical point of contact.

  2. 2025 – 2026

    Senior Frontend Engineer · BairesDev

    AI-driven SaaS: tree navigation architecture, optimistic UI with React Query (+34% perceived responsiveness), Stripe billing, test coverage to ~80%.

  3. 2023 – 2025

    Frontend Engineer · Singular Apps

    From-scratch Next.js platform rebuild across 27 countries; bulk imports at 100k+ catalogs; onboarding rework behind a 35% acquisition increase.

  4. 2021 – 2023

    Frontend Engineer · Thoughtworks

    Global cosmetics platform onboarding (50+ countries, 6M+ consultants) with Cypress and TDD; mobile-first refactor that lifted mobile adoption by ~45%.

  5. 2019 – 2021

    FullStack Engineer · Compasso UOL

    Financial services client (4M+ users): legacy portal to React SPA (+40% performance), Node.js BFF layer, async optimization (-22% response time).

About

Seven-plus years of React, TypeScript, and Next.js on frontends with real operational weight — a financial portal serving 4M+ users, consultant onboarding across 50+ countries, an AI SaaS with heavy document tooling, a platform rebuilt for 27 countries, and now crypto merchant flows at PayPal.

More about how I work →

Contact

Let's build something with real weight.

andersonrocha.rs@live.comor use the form →

Brazil · GMT-3 · open to remote