Senior Full Stack Engineer — Frontend-Focused | AI-native
Senior engineer with 14+ years of experience, frontend-focused — specializing in React, Next.js, and TypeScript, with the backend depth to own a feature from database to UI (Node.js/NestJS, Laravel, REST APIs, payments). Deep in component architecture, performance, and complex UI flows — from fintech vault interfaces to real-time dashboards and browser-based games. I build AI-natively, pairing Spec-Driven Development (SDD) with AI-assisted delivery, and co-ran a digital agency for 11 years (60+ apps).
Based in Peru (GMT-5, full overlap with US Eastern) | Independent Contractor | Fully remote, async-first
- linkedin-bot — Semi-automated LinkedIn job application pipeline with an LLM scoring agent, Telegram notifications, and Easy Apply automation. Built with Python, Playwright, the Anthropic API, PostgreSQL, and python-telegram-bot.
- web3-frontend-skill — Claude Code skill for Web3 frontend development: Wagmi, Viem, RainbowKit, SIWE, wallet flows, on-chain data rendering, and transaction UX patterns.
Frontend — React, Next.js, Vue.js, Nuxt.js, TypeScript, Tailwind CSS, Framer Motion, Design Systems
Full Stack & Backend — Node.js, NestJS, Express, Laravel, REST APIs, Prisma, authentication (NextAuth, JWT, OAuth)
Databases — PostgreSQL, MongoDB, Redis, MySQL
Payments — Culqi, MercadoPago, checkout flows
AI-Assisted Development — Spec-Driven Development (SDD), Claude Code (Agents, Skills), Codex CLI
Web3 (exposure) — Wagmi, Viem, Ethers.js, SIWE
Testing — Vitest, Playwright
| Project | What | Context |
|---|---|---|
| SeaFi | Fintech vaults platform — staking vault UI, real-time balance calculations, rewards countdown with BigInt handling | Built ahead of the company's $4M round |
| Hyacinth | Audit marketplace — Protocol/Auditor dashboards, bidding, real-time chat, multi-source access control | Marketplace generating $30K/month in commissions |
| Wantan Clan | Food e-commerce — storefront and checkout (Culqi), event-driven fulfillment pipeline with webhooks | Real-time order tracking, automated courier dispatch |
| Dremes | Slot-game platform — smart-contract Factory architecture, Coqnet–Avalanche bridge, reusable React game component | Built end-to-end (frontend, backend, on-chain) |
- Website: gaaabz.dev
- LinkedIn: gabriel-sosa-lizarraga
- Email: gabriel.sosa.lizarraga@gmail.com