Hi, I'm Rafa.I build thingsfor the web.

Rafael Gomes
Rafael Gomes
Senior Full-Stack & AI Engineer
About

Senior Full-Stack & AI Engineer with 7+ years building production systems in TypeScript and Node.js, owning features end to end across React/Next.js, Node backends and PostgreSQL.

I design real-time, event-driven architectures and model complex domains like checkout, payments and fulfillment as type-safe, observable state machines.

I bring LLMs into production where they earn their place, and work async across remote, globally distributed teams.

Selected work

Featured builds, from AI pipelines to on-chain finance.

Projects I'm proud to have shipped.

PadelFlow product demoAI Agent · WhatsApp

Senior Full-Stack & AI Engineer

PadelFlow

An AI agent living inside a padel club's WhatsApp that answers questions, sends booking links and coaches players. No app, no integration, no training; a web dashboard tracks bookings, FAQs and voice notes.

TypeScript · Turborepo · WhatsApp Cloud API · LLM agents
Cold Cast product demoAI Agent · Chrome ExtensionVisit site

Senior TypeScript & AI Engineer

Forecast · Cold Cast

Productionized an AI pipeline turning unstructured web data into typed, scored business intelligence, replacing a fully manual prospecting workflow. Deterministic extraction plus an LLM review-and-correct pass, all client-side.

TypeScript · Chrome MV3 (WXT) · React · Zustand · DeepSeek · Zod
Incursion product demoWeb3 · CommerceVisit site

Senior Full-Stack Engineer

Collector Crypt · Incursion

Stateful order-management & fulfillment (Incursion) bridging digital and physical goods, with the print-to-ship lifecycle modeled as deterministic state machines. Unified Solana + Ethereum checkout; payment polling replaced by signed webhooks.

Next.js · Drizzle · Neon · Solana · viem · Cloudflare R2
Sugar Quest product demoGameFi · Telegram

Full-Stack Engineer

Ladder Labs · Sugar Quest

High-concurrency Telegram Mini-App that reached 23k+ active users and won the Sonic Mobius Hackathon. A centralized 8 Hz tick cut CPU on low-end devices; instant on-chain payouts via Solana Actions in Go.

Next.js · WebSockets · AWS Cognito · Solana Actions · Go · Capacitor
Buddy.Link product demoWeb3 · Affiliate

Full-Stack Engineer

Ladder Labs · Buddy.Link

A fully on-chain affiliate network on Solana: unified creator profile, shareable Blinks and instant payout per conversion.

Next.js · TypeScript · Solana · Blinks
Autoestima-se product demoNGO · InstitutionalVisit site

Senior Full-Stack Engineer

Autoestima-se

Institutional site for a national NGO democratizing mental-health care for women and young people in social vulnerability: donation funnel, transparency pages and a trilingual (PT/EN/ES) experience.

Next.js · TypeScript · Sanity CMS · next-intl · Cloudflare Workers
Bem-Te-Vi product demoHealthtech · SaaS

Senior Full-Stack Engineer

Bem-Te-Vi

An integrated operating system for a multidisciplinary health clinic, replacing three disconnected tools. End-to-end NFSe issuance with a self-healing invoice queue (per-line backoff, distributed locks) resilient to a degraded government API.

Next.js · Prisma · Supabase · NextAuth · TanStack Query · Zod
Radar product demoAI · Local-first

Senior Full-Stack & AI Engineer

Radar

Finds and qualifies leads across Twitter/X, LinkedIn and Google. MV3 extensions passively intercept traffic; Express services own the data behind a single SQLite owner; a Next.js dashboard runs the human-in-the-loop. A 12-signal heuristic ranks before LLM triage.

TypeScript · Express · SQLite · Next.js · MCP · Zod
Blue Giant product demoDeFi · Real-time

Backend Engineer

Blue Giant

Real-time asset & price streaming engine with sub-second latency, scaling to thousands of concurrent connections over Server-Sent Events. Cut API latency ~60% via Redis read-through caching and targeted query optimization.

NestJS · PostgreSQL · Prisma · Redis · SSE · Helius
Wolf Capital product demoNFT-Fi · Analytics

Full-Stack Engineer

Wolf Capital

Ecosystem of interconnected Node services processing 10k+ monthly transactions, with a high-performance analytics dashboard surfacing LTV ratios, volume and liquidation alerts in real time.

Next.js · React Query · Redis · Recharts · Solana Web3.js
Degen Legends product demoGameFi · Web3

Full-Stack Engineer

Degen Legends

NFT gaming platform pairing an in-app breeding constructor with a merch marketplace. Automated, event-driven reward distribution and a social-verification pipeline removed manual moderation from the reward flow.

NestJS · React · PostgreSQL · Prisma · Docker
Mallow Art product demoNFT · MarketplaceVisit site

Full-Stack Engineer

Mallow Art

Curated NFT art marketplace on Solana: limited editions, live artwork drops and burn mechanics behind a mobile-first storefront. Delivered with an embedded engineering team through Cold Brew Digital.

React · Solana · IPFS
Align product demoWeb3 · GovernanceVisit site

Full-Stack Engineer

Align

Solana-native DAO governance with multisig treasuries, NFT/token-weighted voting and on-chain hackathons; NestJS + GraphQL backend on the Helium SDKs, Sign-In-With-Solana frontend.

NestJS · GraphQL · TypeORM · Anchor · Solana · Helius
Pump Science product demoDeSci · SolanaVisit site

Full-Stack Engineer

Pump Science

Decentralized-science platform for funding and tokenizing research, built embedded into the client's team during a Solana hackathon.

Next.js · React · Solana Web3.js · Anchor · Supabase
Azevedo Store product demoE-commerceVisit site

Full-Stack Engineer

Azevedo Store

Counter-Strike 2 skins store with float/wear filters, persistent cart, authentication and a complete admin panel.

Next.js · Prisma · Postgres · NextAuth · React Query · Zod
Pulse Bar product demoMarketing siteVisit site

Full-Stack Engineer

Pulse Bar

High-fidelity animated site for an AI app/game generator, with hand-built motion, popup transitions computed from getBoundingClientRect and interactive cursor demos.

Next.js · React · Tailwind · CSS keyframes
More engagements

TreeShake

Web3 · DAO

Front-end and a scalable Node API for NFT DAO management on Solana, with wallet-adapter social login and a Discord bot for community ops.

Next.js · Node · MongoDB · Solana · Discord.js

Solana Ecosystem

NFT · Consulting

14+ NFT collections for entrepreneurs and artists via Metaplex Candy Machine v2: whitelisting, secure wallet integration and Arweave/IPFS storage.

Metaplex · Solana Web3.js · Arweave · IPFS
Open source & personal

agente-pessoal

AI · Automation

Terminal-only personal assistant on Claude Code driving Gmail, Calendar, Drive and an Obsidian vault, with defense-in-depth prompt-injection hooks that gate sensitive tools after any external read.

TypeScript · Claude Code · MCP · Google APIs · Playwright

chip-22kado

Go · Discord bot

~20 MB single-binary Go music bot that delegates audio decoding and voice streaming to a Lavalink JVM over REST/WS; DAVE/E2EE compliant, self-hosted on a homelab with its own CI runner.

Go · discordgo · Lavalink · Docker

homelab

Infra as code

Ansible IaC for a two-machine homelab; a self-hosted GitHub Actions runner applies the playbook over SSH with ephemeral secrets and zero inbound exposure.

Ansible · Docker · GitHub Actions · Ollama
Client sites · Cold Brew Digital

Fast, SEO-ready institutional sites, landing pages and lead funnels, with polished motion and performance built in from the first line of code.

Fono Ana site showcaseDeus e Aguiar site showcaseMartins Ventura site showcaseISR Elétrica site showcaseFotum Engenharia site showcase
Your next project · here?
Fono AnaVisit site

Speech therapist in Jaraguá do Sul, with a playful, parent-friendly brand funneling visitors straight to WhatsApp.

Stack

Tools I reach for daily.

01Languages
TypeScriptJavaScriptGoPython
02Frontend
ReactNext.jsTailwindshadcn/ui
03Backend
Node.jsNestJSExpressHonoGraphQLRESTMicroservices
04Data
PostgreSQLDrizzlePrismaNeonRedisBullMQSQLite
05Real-time & Arch
WebSocketsSSEEvent-DrivenState MachinesZodOpenAPI
06Cloud & Infra
Vercel EdgeCloudflare R2AWSGCPDockerKubernetesCI/CDSentryChrome MV3 (WXT)Playwright
07Web3
Solana Web3.jsAnchorMetaplexHelius
08AI / LLM
AnthropicOpenAIDeepSeekGeminiOllamaVercel AI SDKMCPStructured OutputsStateful Agents
Contact

Let's build
something good.

Currently open to new projects: full-time, direct contract, consulting or through Cold Brew Digital. Always happy to chat.