I build scalable products
from architecture to production.
$ ls ~/skills
$ ls ~/projects
Open-source explorations in distributed systems, AI pipelines, and concurrency.
Task Management System
A microservices-based task management platform with real-time collaboration. Multiple services communicate through RabbitMQ, enabling async workflows and loose coupling. Features WebSocket-powered live updates and a React frontend with optimistic UI.
- ▸Microservices architecture with API Gateway
- ▸Event-driven async communication
- ▸Real-time WebSocket updates
News Agent RAG
An AI-powered information retrieval system using Retrieval-Augmented Generation. Ingests news articles, processes them through LLMs, stores vector embeddings, and enables semantic querying. Kafka handles stream ingestion for real-time processing.
- ▸End-to-end RAG pipeline
- ▸Kafka streaming ingestion
- ▸LLM-powered semantic search
TuneSync
A playlist converter that moves music between streaming platforms like Spotify and YouTube. Explores complex OAuth flows, third-party API integrations, and music metadata matching algorithms across different catalog systems.
- ▸Multi-platform OAuth integration
- ▸Cross-catalog music matching
- ▸Product-focused UX design
Go Event Counter
A backend event-processing service built to explore Go concurrency primitives. Simulates high-throughput event handling using goroutines, channels, and worker pool patterns with minimal overhead.
- ▸Go concurrency model deep-dive
- ▸Worker pool pattern
- ▸Race-condition-safe design
Contract Project (Education Platform)
Full-Stack Engineer
Sep 2025 — Present
Joined a 3-engineer team to build an education platform from scratch in 2 months, replacing a third-party solution. Defined the frontend architecture and contributed across the full stack.
AlfaCon
Full-Stack Engineer
Jun 2023 — Aug 2025
Worked on the core product team of Brazil's largest competitive exam prep platform, building AI-powered features and full-stack solutions serving 5M+ users.
$ cat services.json
How do I charge?
Transparent tiers, no surprises. Hover to decode pricing — or skip straight to a conversation.
tier 1
Landing Page
Single page, responsive, SEO optimized. Perfect for product launches and personal brands.
- [x]Design & Development
- [x]Responsive & Mobile-first
- [x]SEO Optimization
- [x]Deployment & Hosting
tier 2
Full-Stack Application
Complete web application with frontend, backend, database, and deployment pipeline.
- [x]Everything in Landing Page
- [x]Authentication & Authorization
- [x]REST / GraphQL API
- [x]Dashboard & Admin Panel
- [x]CI/CD Pipeline
tier 3
AI Integration
LLM integration, RAG pipelines, AI-powered chatbots and intelligent automation.
- [x]Everything in Full-Stack
- [x]LLM Integration (OpenAI, Claude)
- [x]RAG Pipeline & Vector Search
- [x]AI Chatbots & Agents
- [x]Fine-tuning & Evaluation
- [x]Production Monitoring
tier 4
Enterprise
Custom scope, architecture consulting, and dedicated support for complex projects.
- [x]Everything in AI Integration
- [x]Architecture Design & Review
- [x]Technical Consulting
- [x]Dedicated Support Channel
- [x]Custom SLA & Scope
- [x]Team Training & Handoff
$ ssh colman@colman.dev.br