Senior Backend Developer (Services)

New

payablPayments, fintech

Remote from Poland (Contractor arrangement)ContractSenior

Salary not disclosed

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Job Details

Have 5+ years of backend engineering experience and strong Python expertise.
Have deep AsyncIO proficiency and experience building non-blocking, high-reliability microservices.
Have production-grade experience with FastAPI.
Have experience with MySQL and/or PostgreSQL, including query design, schema understanding, and migration strategies.
Have experience writing unit and integration tests; pytest is preferred.
Be experienced in designing and consuming external APIs, including webhooks, callbacks, and complex retry policies.
Be willing to take ownership of high-traffic, always-up applications and operate independently within an established architectural vision.
Be comfortable working in complex distributed environments where reliability is non-negotiable.
Have strong written and verbal English.

Read legacy PHP, Perl, or JavaScript code, extract its business logic, and reimplement it in a modern microservices architecture.
Build reliable, scalable microservices and contribute to the evolution of the service layer architecture.
Ensure idempotency, data integrity, and graceful error handling across services.
Build new features and refactor legacy modules into clean, maintainable code.
Design and consume external APIs, including webhooks, callbacks, and complex retry policies.
Collaborate with stakeholders across departments in agile sprints.
Contribute to CI/CD pipelines, Docker, or Kubernetes infrastructure where relevant.
Propose tools or technologies that can improve performance, security, or development speed.

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