About
I'm Sebastian Procek, a Senior Backend Developer and Software Architect with 15+ years of experience, specializing in Domain-Driven Design, distributed systems, regulated fintech, and large-scale e-commerce platforms.
What I work on
- Domain-Driven Design, hexagonal and onion architectures
- CQRS, event-driven systems, microservices and modular monoliths
- Multitenant SaaS platforms
- Regulated fintech: payments, FX, double-entry ledgers, bank reconciliation
- High-scale e-commerce on microservice platforms
- Team leadership (~4 years as Team Leader)
Tools of the trade
- Languages: PHP 7/8, .NET
- Frameworks: Symfony, Doctrine
- Data & messaging: PostgreSQL, MySQL, Redis, RabbitMQ, Apache Kafka
- Cloud & orchestration: AWS, Azure, GCP, Kubernetes, Docker
- Quality & observability: PHPUnit, TDD, PHPStan, Deptrac, Sentry, Grafana, ELK, Prometheus