Rio de Janeiro, Brazil · Open to remote roles

Yuri Correa

Senior Full Stack / Mobile / Blockchain Engineer

I build complete products: mobile app, backend, infrastructure and security, built to handle real money.

React Native
Go
Fintech
Solana
Solidity
AI

Download CVEN PT

−70%

App cold start, 7s → 2s

Farfetch / Stadium Goods

300+

White-label app builds — release time from hours to seconds

Cativa Digital

2 → 4.6★

Supermarket app rebuild, +30% revenue

Zona Sul

2,000+ ETH

Primary sales across 15 NFT / Web3 launches

Independent ventures

2

Pix payment gateways running in production

Fintech

10M

Rounds simulated to validate a provably fair game engine

Gaming

Featured

Live on the App Store · iOS & Android · 2026

Every party in the city, one app.

Sextou gathers parties and shows in Rio de Janeiro and São Paulo from the major ticketing platforms into one app, with personalized recommendations, coupons, VIP guest lists and live updates. I built the whole thing solo: scrapers, backend, dashboard, mobile app and infrastructure.

View on the App Store sextou.club

Collect
Python scrapers over 12 ticketing platforms, hourly and staggered. JSON APIs, embedded structured data and browser-grade TLS impersonation to get past bot protection. ~2,300 events aggregated.
Process
A versioned message contract over Redis Streams; Rails is the single writer. Idempotent ingestion and cross-source dedup. On-demand enrichment with Playwright, pushed live to the app over WebSockets.
Deliver
Expo / React Native app in 5 languages with Apple & Google sign-in and push. Rails 8 + Hotwire dashboard for curation, moderation, push campaigns, analytics and venue guest lists.

Pipeline

12 sources

Ticketing platforms

Scrapers

Python · hourly

Redis Streams

Versioned contract

Rails

Single writer

AppExpo

DashboardHotwire

first commit → App Store: ~3 wks
sources: 12
cities: 2
languages: 5
analytics event types: 19
Docker services: 8

React Native
Expo
Ruby on Rails 8
Hotwire
Sidekiq
PostgreSQL
Redis Streams
Python
Playwright
Next.js
Docker
Caddy
Cloudflare

Selected work

Fintech · 2026In production

Pix Payment Gateways & Banking Platform

Two multi-merchant Pix payment gateways running with real merchants, plus a banking-as-a-service portal in progress.

Go hexagonal architecture, double-entry ledger with derived balances, transactional outbox on NATS JetStream.
6 payment-provider adapters behind one registry — weighted routing, failover, circuit breaker, reconciliation.
Unit, integration, property-based, fuzz and adversarial security tests; 76.7% coverage; blue/green deploys with zero failed requests.

Go
PostgreSQL
Redis
NATS JetStream
React
OpenTelemetry
Prometheus
Docker
Cloudflare

Fintech / Crypto · 2026Staging

White-label Pix ↔ USDT Exchange

A white-label platform to swap Brazilian reais and USDT, backed by a multi-tenant liquidity and custody provider.

Multi-asset double-entry ledger; invariants enforced by database triggers and 100+ SQL-verified guarantees in CI.
Binding quotes with treasury position bands; EVM chain indexing (Ethereum, BSC, Polygon, Tron) with reorg quarantine.
HMAC-signed webhooks, tiered KYC, encrypted personal data with key rotation.

Go
PostgreSQL
TimescaleDB
Redis
React 19
Foundry
Docker
Cloudflare

Gaming · 2026Built & audited

Real-time Multiplayer Crash Game

A provably fair multiplayer crash game, delivered as a white-label provider that operators embed.

Go WebSocket round engine + PixiJS 8 browser client (replacing an Unreal Engine prototype).
Provably fair outcomes (SHA-256 hash chain + HMAC), validated by a 10M-round simulation: 96.96% RTP vs. 97% target.
Fixed 83 security-audit findings — double-spend, replay, pay-after-crash — before launch.

Go
Fiber
WebSockets
PixiJS
TimescaleDB
Docker
Cloudflare

Web3 · 2025–2026Live

Solana Token Launch Platform & Trading Terminal

No-code token launches on Solana and a real-time terminal to launch and trade in one click.

Non-custodial web app on Cloudflare Workers: token creation, liquidity pools on 4 DEXs, swaps, embedded wallets via email login.
Chrome extension (Manifest V3) published on the Chrome Web Store.
Real-time backend landing transactions across 6 launchpads/DEXs; Go market-data pipeline for live OHLC charts.

TypeScript
React 19
TanStack Start
tRPC
Go
Solana web3.js
Metaplex
Jupiter
Supabase
Cloudflare Workers

PropTech / AI · 2026In use by a client

Multi-tenant Real-Estate SaaS with AI Document Extraction

A white-label CRM for land-subdivision sales, where AI reads site-plan PDFs and turns them into an interactive lot map.

Vision-language model pipeline with swappable providers (Gemini, local Qwen-VL on MLX, Ollama, Claude), benchmarked on real plans.
Per-tenant subdomains with on-demand TLS, granular RBAC, append-only audit log, offline-first PWA for field sales.
~400 backend tests in CI.

Python
FastAPI
PostgreSQL
Next.js
OpenSeadragon
Konva
Docker
Caddy

E-commerce · 2026In production

Commission Program SaaS for E-commerce Brands

A referral and commission portal for brands' partners, now multi-tenant and security-hardened.

Multi-tenant support: stores, per-store admins and super-admin.
Hardened production: JWT signature validation, locked-down database functions, RLS-scoped reads, authorization test suite.

Deno
Fresh
Preact
Supabase
PostgreSQL
VTEX

Mobile / AI · 2026Prototype

AI Life-Simulation Game

A "second life" in your pocket — AI characters live on their own and react to your real weather, steps and mood.

LLM-driven characters with Big Five personalities, memory and relationships.
Cost-aware model routing (fast model for routine, smarter model for key moments) + tiered tick scheduler.
React Native app, Fastify + Socket.io API, PostgreSQL (68 tables), Redis.

React Native
Expo
TypeScript
Fastify
Socket.io
PostgreSQL
Redis
Claude API

Mobile / SaaS · 2026Prototype

Real-time QR Ordering SaaS for Kiosks

Customers scan a single-use QR code at the table, order, chat with staff and follow their bill live, with no app to install.

Each tab issues a single-use QR session; closing the tab invalidates it, and idle tabs expire after 3 hours.
Orders, chat and the bill stay in sync between customers and staff in real time.
Stripe subscriptions (checkout, billing portal, webhooks, coupons) and a trilingual UI (EN, PT-BR, ES) delivered as a PWA.

Next.js 16
React 19
Convex
Stripe
next-intl
Tailwind
PWA

Smaller builds

Token presale platformMulti-chain custodial deposits (USDT on Ethereum/Tron/BSC + Pix).Express · Prisma · ethers · TronWeb · RabbitMQ
Live-stream donation platformPix donations with real-time TTS alerts and stream overlays.Express · WebSockets · Next.js
Hardened game-server kitIsolated multiplayer server on a production host, with auto-rollback.Bash · systemd · iptables · Docker · Lua
Solana rent-reclaim dAppRecover SOL from unused token accounts in batches.Next.js · wallet adapter
Cinematic marketing siteScroll-driven frame-sequence animation.Next.js · GSAP · canvas

Experience

Oct 2023 – Sep 2026
Cativa DigitalSenior Mobile Engineer
Release time from hours to seconds across 300+ white-label builds; React Native apps, Next.js/Node.js services and local AI agents (Ollama).
Jun 2021 – Present
Independent Ventures / FreelanceTechnical Co-founder & Full Stack Engineer
15 NFT/Web3 launches (2,000+ ETH); since 2025, technical partner on 20+ products in fintech, Web3, gaming, proptech and AI.
Jan 2023 – Feb 2024
Farfetch / Stadium Goodsvia FCamaraSenior Mobile Engineer
Cold start 7s → 2s; led the mobile team; native modules and Detox/Jest coverage.
Sep 2022 – Nov 2022
Starter LabsNew YorkBlockchain Developer
Truffle → Hardhat migration; Node.js APIs.
Mar 2020 – Aug 2021
Zona Sulvia CoreBizSenior Mobile Engineer
Rebuilt the supermarket app from 2 to 4.6 stars; +30% revenue.
Mar 2018 – Apr 2022
Cativa DigitalSenior Mobile Engineer
White-label social app powering ~30 clients from one codebase.
Nov 2012 – Feb 2018
BlogfarmFull Stack Developer
E-commerce platforms (Java/PHP, AWS).
Aug 2009 – Oct 2012
Esporte InterativoDev Coordinator / Intern
Web systems and cloud infrastructure.

Stack

About

I'm a software engineer from Rio de Janeiro. I started in 2009 building web systems for a sports network, spent years shipping React Native apps for retailers and brands, and fell for blockchain in 2021. Today I build full products as a technical co-founder, mostly in fintech, Web3 and AI, and I'm driven by challenges.

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Get in touch

yuricorrea@live.com

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