Senior Backend Developer (Services)

Poland·KrakówRemotesenior

EngineeringBackend Developer

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Overview

payabl. empowers businesses to grow through payments innovation and banking services.

Technical Tools

EngineeringBackend Developer

~1 min read

→Design, build, and maintain high-performance Python microservices (FastAPI, AsyncIO)
→Analyze legacy systems and extract business logic into modern architectures
→Refactor and migrate existing modules into clean, scalable, and maintainable services
→Ensure system reliability through idempotency, fault tolerance, and robust error handling
→Design and integrate external APIs, handling edge cases, retries, and failures
→Implement and manage webhooks, callbacks, and complex retry mechanisms
→Write high-quality unit and integration tests
→Collaborate with cross-functional teams to ensure service stability and performance
→Contribute to architectural discussions and continuous system improvements
→Take ownership of services end-to-end, from design to production

5+ years of backend development experience with strong Python expertise
Deep knowledge of AsyncIO and FastAPI
Experience building non-blocking, high-reliability microservices
Strong experience with relational databases (MySQL, PostgreSQL)
Solid understanding of API design and third-party integrations
Experience implementing webhooks, callbacks, and retry strategies
Strong testing practices (unit and integration testing)
Ability to work with legacy systems and migrate them into modern architectures
Strong analytical and problem-solving skills
Ownership mindset and ability to work autonomously within a defined architecture

~1 min read

Step 1 – Thinking in Action (40 minutes) Your first conversation will be with our Talent Acquisition team. We'll explore your background, career journey, motivations, and overall fit for the role. As part of this discussion, you'll also complete a short technical screening that will be reviewed by our engineering team. This stage helps us understand both your experience and how you approach technical challenges.
Step 2 – Build in Production (60–90 minutes) Meet with the Team Lead and technical experts for a practical assessment. Depending on the role, this may involve a live coding exercise or a real-world scenario designed to evaluate your technical skills, problem-solving approach, and ability to work through challenges similar to those faced by our teams.
Step 3 – Final Interview (45 minutes) The final stage is a group interview with senior members of our Technology squad, which may include the CTO, CPO, and Team Lead. Together, we'll discuss team fit, collaboration style, expectations from both sides, and any remaining questions about the role, team, or technology domain. This is also an opportunity for you to learn more about our culture and ways of working.