Senior Software Engineer (API Platform) - Poland

5+ years of experience as a backend or platform engineer working on large-scale, distributed systems Experience with at least one modern server-side stack (e.g., Ruby/Rails, Python, Java, Kotlin, Node, etc.) Proven track record of designing and implementing APIs (REST and/or gRPC), including versioning and handling breaking changes Hands-on experience with production observability and reliability Practical knowledge of caching, rate limiting, and performance tuning for networked services Strong communication skills and comfort working in a remote-first, asynchronous environment Fluency in both Polish and English

Design and build platform services and tooling that support API design, documentation, discovery, observability and lifecycle management Help define and roll out conventions for resource modeling, versioning, error handling and other core API design concerns Implement and improve cross-cutting capabilities such as API monitoring, logging, rate limiting, caching and throttling Participate in system design and architectural discussions focused on performance, scalability, reliability and distributed systems concerns Mentor other engineers in API design, distributed systems, and platform thinking, and help evangelize best practices across the organization