Lead API Developer [J245]

As the Lead API Developer, you will own the design, development, and delivery of backend services powering the mobile app experience. You'll combine deep technical expertise in Python and FastAPI with strong architectural thinking to create robust, secure, and performant APIs that scale to millions of users. Working closely with front-end, mobile, and cloud engineers, you will define API standards, optimize data flows, and ensure operational excellence across environments., * Design, implement, and maintain high-performance RESTful APIs using Python and FastAPI.

• Architect scalable and maintainable backend systems, ensuring fault tolerance, horizontal scalability, and low latency.
• Apply asynchronous programming techniques (async/await) and leverage Pydantic for request/response validation.
• Define and enforce API design standards, versioning, and consistent documentation (OpenAPI/Swagger).
• Integrate and manage third-party APIs, ensuring compliance with security and rate-limiting constraints.
• Implement OIDC/OAuth 2.0 for secure authentication and authorization flows.
• Collaborate with mobile, frontend, and DevOps teams to optimize end-to-end system performance and deployment pipelines.
• Leverage AWS services - ECS, ECR, CloudWatch, Secrets Manager, ElastiCache, and DynamoDB to build reliable and cloud-native architectures.
• Write comprehensive unit and integration tests with Pytest, and maintain high code quality and coverage.
• Contribute to CI/CD automation and ensure best practices for release management and observability.

Do you have experience in System design?, * Strong proficiency in Python and production-grade experience with FastAPI (routing, dependency injection, middleware, async/await).

• Deep understanding of RESTful API architecture, HTTP protocols, and distributed systems design.
• Hands-on experience with OIDC/OAuth 2.0 authentication flows.
• Strong knowledge of API gateway concepts, interservice communication, and load balancing.
• Proficiency with AWS (ECS, ECR, CloudWatch, Secrets Manager, DynamoDB, ElastiCache).
• Experience with CI/CD pipelines and DevOps workflows (GitHub Actions, Jenkins, GitLab CI, etc.).
• Solid grasp of containerization (Docker) and microservice deployment best practices.
• Strong collaboration, problem-solving, and communication skills and able to partner effectively with product and engineering teams.

Preferred Qualifications

• Experience building APIs for real-time mobile or fan engagement platforms.
• Familiarity with GraphQL or WebSockets for live data delivery.
• Exposure to observability and tracing tools (e.g., Prometheus, Grafana, OpenTelemetry).
• Knowledge of data caching strategies for high-traffic APIs.
• Understanding of event-driven architectures using AWS EventBridge, SNS, or Kafka.

• Attractive salary
• Large freedom and real influence
• No unhealthy competition, team approach to meeting challenges
• Remote-first, flexible working culture
• Company apartments in cool cities across Europe: work and enjoy a memorable getaway

We are a software house with 18 years of experience and a global portfolio of projects. We help businesses modernize, scale, and innovate through custom software solutions - always with a focus on flexibility and quality. Our team embraces unconventional ideas and new technologies, delivering solutions that drive real impact. If you value professionalism, creativity, and a strong engineering culture, you'll feel at home here.