Open to opportunities

Rostyslav Kondratiuk

@rostyslavkondratiuk

Python backend engineer building production systems: FastAPI microservices, Kafka, Telegram bots, and optimized databases.

Poland

Message

What I'm looking for

I’m looking for a Python backend role where I can build event-driven, production-grade systems (FastAPI, Kafka, databases), own performance improvements, and collaborate cross-functionally—while growing through structured mentorship as I deepen my Go and Rust skills.

I’m a Python backend engineer with 2+ years of experience building production systems—from a Telegram bot serving 50k+ users to event-driven microservices with Kafka. I ship real code in production and take pride in writing clean, maintainable, efficient systems.

At S4GA, I develop and maintain FastAPI backend services for aviation monitoring, integrating external services like a Weather API and processing IoT device data streams into PostgreSQL. I build WebSocket connections for real-time device status updates, and I’ve improved performance by optimizing database queries (reducing response time by 60%).

I also design reliable backend architecture: REST API endpoints, authentication/authorization with JWT, role-based access control, and secure data handling. I implement caching with Redis, manage schema migrations with Alembic and SQLAlchemy, and containerize microservices with Docker for independent scalability.

Before moving deeper into backend engineering, I brought 10 years of technical project management experience in aviation—translating client requirements into technical solutions and coordinating delivery. I’m self-taught with mentor guidance and I’m currently studying Go and Rust fundamentals through structured mentorship.

Experience

Work history, roles, and key accomplishments

Current

Python Backend Engineer

Current

S4GA

Mar 2023 - Present (3 years 3 months)

Developed and maintained FastAPI backend services for aviation monitoring, integrating Weather API and processing IoT device data into PostgreSQL. Built WebSocket real-time updates, implemented Redis caching, and optimized database queries to reduce response time by 60%.

fastAPI PostgreSQL Redis WebSockets Docker REST APIs SQL Query Optimization

IT Project Manager

Globmill

Mar 2022 - Feb 2023 (11 months)

Managed IT projects end-to-end by coordinating development teams and stakeholders to deliver solutions on schedule. Worked with Git and REST APIs while aligning cross-functional efforts around technical delivery.

IT Project Management Stakeholder Management Cross functional Coordination Git REST APIs Technical Requirements

Project Manager

S4GA

Feb 2018 - Mar 2022 (4 years 1 month)

Managed modernization and development of aviation control systems, portable military airfield lighting, and solar field stations. Supervised worldwide installation of airport photovoltaic lighting systems and supported clients through training, service visits, and budget forecasting.

Project Management Budgeting & Forecasting Client Training Process Automation Documentation

Manufacturing Manager

S4GA

May 2015 - Jan 2018 (2 years 8 months)

Managed the full production process for airport lighting systems, including planning and quality control. Led HR operations and prepared production documentation while managing client communication related to service and warranty.

Production Management Quality Control HR Operations Team Management Production Documentation Client Communication Process Supervision