Skip to content
View guifast's full-sized avatar
0 followers · 1 following

Block or report guifast

Block user

Prevent this user from interacting with your repositories and sending you notifications. Learn more about blocking users.

You must be logged in to block users.

Maximum 250 characters. Please don’t include any personal information such as legal names or email addresses. Markdown is supported. This note will only be visible to you.
Report abuse

Contact GitHub support about this user’s behavior. Learn more about reporting abuse.

Report abuse
guifast/README.md

Guilherme Fath

Full-Stack Product Engineer based in Brazil

I design, build and ship production SaaS platforms, business systems and AI-powered integrations.

My work spans product architecture, frontend, backend, relational data modeling, third-party APIs, cloud infrastructure and production operations.

Selected products

CRM by Fatek

Multi-tenant business management platform combining CRM, ERP, finance, inventory, omnichannel communication and AI-powered automation.

Stack: TypeScript, Next.js, React, NestJS, PostgreSQL, Prisma and AWS.

View product

Revello

AI-powered vertical ERP for gyms, covering billing, member management, attendance, retention, churn-risk detection and operational AI agents.

Stack: TypeScript, Next.js, React, NestJS, PostgreSQL, Prisma and Vitest.

View product

Imob Agents

Vertical SaaS platform that uses AI-powered WhatsApp conversations to update real estate portfolios, structure owner responses and generate prioritized tasks for agents.

Stack: TypeScript, Next.js, React, PostgreSQL, Prisma, OpenAI and WhatsApp integrations.

View product

Strong Body Rewards

B2B2C loyalty platform connecting a supplement brand, partner gyms and customers through purchases, validations, levels and rewards.

Stack: TypeScript, React, TanStack, Supabase, Cloudflare and Vitest.

View product

Public source

Core stack

Languages       TypeScript · JavaScript · SQL
Frontend        React · Next.js · Tailwind CSS · TanStack
Backend         Node.js · NestJS · REST APIs · WebSockets
Data            PostgreSQL · Prisma · Supabase · Neon
Infrastructure  AWS EC2 · Nginx · Cloudflare
Integrations    AI APIs · WhatsApp · Stripe · Melhor Envio · Resend
Quality         Vitest · Jest · TypeScript · ESLint · Sentry

What I work on

  • Multi-tenant SaaS architecture
  • Business systems and internal tools
  • CRM and ERP platforms
  • AI agents and workflow automation
  • API and webhook integrations
  • Payments, logistics and communication systems
  • Production deployment and cloud infrastructure

Current focus

I am currently exploring remote international opportunities as a:

  • Full-Stack Engineer
  • Product Engineer
  • Software Engineer
  • Integration Engineer

Links

Popular repositories Loading

  1. guifast guifast Public

  2. multi-tenant-saas-starter multi-tenant-saas-starter Public

    Production-oriented multi-tenant SaaS reference implementation built with Next.js, NestJS, PostgreSQL and Prisma.

    TypeScript

  3. developer-portfolio developer-portfolio Public

    Public developer portfolio built with Next.js and TypeScript

    TypeScript

  4. reliable-webhook-processor reliable-webhook-processor Public

    Production-oriented webhook processing reference built with TypeScript, NestJS, PostgreSQL, Prisma, durable jobs, retries, idempotency and replay.

    TypeScript