role: Backend Engineer & Systems Engineer
focus: Distributed Systems | API Development | Performance Optimization
languages: [C#, Python, Go, C++]
location: Remote | UTC+2
status: Available for freelance

Backend developer passionate about building scalable systems that handle real traffic. I focus on clean architecture, performance optimization, and delivering solutions that work in production.

Core Skills: API Design • Async Programming • Database Optimization • Microservices • System Architecture

Production-ready social platform serving 500+ users with 1000+ req/sec

Python FastAPI MongoDB Redis Docker

• RESTful API with JWT/OAuth2 authentication
• Async architecture with optimistic concurrency control
• Real-time features with WebSocket support
• 99.9% uptime with automated testing

Mock payment system for testing payment integrations

Python FastAPI PostgreSQL Docker

• Complete payment flow simulation with OTP verification
• HMAC-signed webhooks with automatic retry logic
• Multi-language UI with dark mode support
• Card storage and transaction history

Custom database engine with optimistic concurrency control

Python Docker

• Implements OCC for concurrent transactions
• SHA-256 integrity verification
• Strategy pattern for extensible operations
• 99.99% data integrity in tests

Real-time system monitoring with sub-100ms refresh rates

C# .NET WPF

• Multi-threaded CPU/RAM/GPU monitoring
• WMI integration for hardware metrics
• MVVM architecture with clean separation
• Live charts and performance graphs

Languages: Python • C# • Go • C++ • TypeScript

Backend: FastAPI • Django (DRF) • .NET • Flask • AsyncIO

AI & LLM: OpenAI API • Anthropic (Claude) • Prompt Engineering • RAG

Databases: PostgreSQL (NeonDB, Supabase) • MongoDB • Redis • SQLite • MS SQL • Vector DBs

ORM & ODM: SQLAlchemy • Django ORM • Entity Framework Core • SQLModel • Motor

DevOps & Cloud: Docker • CI/CD (GitHub Actions) • Render • Railway • Azure • Heroku

Tools: Git • Linux • Postman • Celery/RabbitMQ • Telegram API

Testing: Pytest • Unittest

Frontend: React • Tailwind CSS • Jinja2

Backend Development — Building scalable APIs and microservices that handle real-world traffic

System Design — Architecting distributed systems with focus on performance and reliability

Database Optimization — Query optimization, indexing strategies, and data modeling

DevOps Integration — Docker containerization, CI/CD pipelines, and deployment automation

Open for:

• Freelance backend development projects
• System architecture consulting
• Performance optimization work
• Interesting technical challenges

Best way to reach me: tymofiischur@gmail.com