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Hi there πŸ‘‹ I'm Sebastian Alvarez

Senior Software Engineer based in Argentina πŸ‡¦πŸ‡·, working remotely with US companies since 2019.

πŸ“Š About My Contribution Graph

If you're wondering about my contribution activity β€” most of my daily coding happens in a separate work GitHub account (private company repos). What you see here are my personal projects and open-source work.

πŸ”§ By day: Senior Software Engineer at Cognativ Inc., building real-time video analytics engines with Go, Kafka, and AWS IoT Core.

🎡 By night: Creator of VinilHub, Argentina's first vinyl marketplace.

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πŸš€ What I Do

I build production systems at scale with 8+ years of experience. My expertise lies in:

β†’ Distributed Architectures using CQRS, DDD, and event-driven design

β†’ Real-time Systems processing high-throughput IoT events with sub-100ms latency

β†’ Full-stack Development from backend APIs to React/Next.js frontends

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πŸ› οΈ Tech Stack

Languages

Go (primary) β€’ TypeScript β€’ Python β€’ SQL

Backend & Architecture

Fiber β€’ NestJS β€’ Django β€’ CQRS β€’ DDD β€’ Hexagonal Architecture β€’ Microservices

Databases & Messaging

PostgreSQL (expert) β€’ MySQL β€’ DynamoDB β€’ Redis β€’ Kafka

Cloud & DevOps

AWS (S3, Lambda, IoT Core, EC2, SNS, SQS) β€’ Docker β€’ Kubernetes β€’ GitHub Actions

Frontend

React β€’ Next.js β€’ Tailwind CSS β€’ Zustand

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⚑ Key Achievements

Project Description
Real-Time Analytics Engine Architected a video analytics engine in Go processing IoT events with sub-100ms latency, integrated with AWS IoT Core and Kafka
VinilHub Marketplace Built Argentina's first vinyl marketplace β€” complete e-commerce with 3 payment providers (MercadoPago, Rebill, PayPal)
Subscription Billing System Designed billing handling 4 plan tiers with trials, proration, grace periods, and webhook processing
CI/CD Pipelines Established pipelines with Buildkite, Jenkins, and GitHub Actions across multiple production projects

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🎡 Featured Project: VinilHub

Argentina's first specialized vinyl marketplace connecting record stores, collectors, and buyers.

Architecture Highlights:

πŸ—οΈ Next.js 15 monorepo with 3 apps sharing UI library via Turborepo

βš™οΈ NestJS backend with TypeORM, PostgreSQL, clean layered architecture

πŸ” JWT auth with HTTP-only cookies, refresh token rotation, RBAC

πŸ’³ Strategy Pattern for multiple payment providers with webhooks

πŸ“ˆ React Server Components, ISR, connection pooling for performance