**WHAT YOU'LL BE WORKING ON** * Analysis of the existing program code, identification and elimination of errors * Development of program code for company projects * Interaction with the development department, testing * Support and development of integrations with side services. **WHAT YOU NEED TO SUCCEED IN THIS ROLE** * 5\+ years of professional experience with Python 3\.10\+, with a deep understanding of its asynchronous programming model * Domain knowledge in payment systems or financial flows * Strong hands\-on experience with asyncio, FastAPI or aiohttp, SQLAlchemy, and Django ORM * Experience in system design (Scalability, Reliability \& Fault Tolerance, Security, Performance) * Practical experience with microservice architectures, API development, and service\-to\-service communication (REST, GRPC) * Knowledge of and experience with message queues like RabbitMQ or Kafka * Experience writing and maintaining unit/integration tests with modern testing frameworks * Experience with Grafana loki(LogQL), Jaeger/Tempo * Familiarity with gitlab CI/CD, Docker, Kubernetes, Helm, and cloud infrastructure (e.g., AWS, GCP) is a plus * Knowledge of how 3ds2 flow works is a big plus * Good English communication skills (written and spoken) and fluent russian. **OUR TECH STACK** Python 3\.12, FastAPI, Django, async gRPC, asyncio, pytest, GitLab CI/CD, Kubernetes (K8s), Helm, PostgreSQL. **WHAT WE OFFER** * An opportunity to make something great even greater, you can be the reason why we grow, develop, and become **the best fintech company on the market!** * Career prospects \- we are young, we have huge ambitions, and it is important that our employees grow with us * Work with coworkers who are passionate about their business * Compensation that will fully correspond to the competence and knowledge, with yearly performance reviews * Remote type of work * 20 days of vacation time; bank holidays; Sick leaves; Additional birthday day off You can find out more about our team, our values, and the unique ways we celebrate our successes here: https://fyst.com/culture S5JlskUB7f