Senior Backend Developer (Services)
payabl. · Warsaw, Masovian Voivodeship
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- Company
- payabl.
- Location
- Warsaw, Masovian Voivodeship
- Employment type
- Full-time
- Posted
- June 24, 2026
About this job
Remote from Poland (Contractor arrangement) or Cyprus Onsite (employment arrangement) Reporting to: Technical Lead What you will do: Legacy Modernisation: Read legacy code (PHP, Perl, or JavaScript), extract the business logic, and reimplement it correctly within a modern microservices architecture. Reliability First: Ensure idempotency, data integrity, and graceful error handling across all services — "almost working" is never good enough. Greenfield & Refactoring: Split your time between building new features from scratch and refactoring existing legacy modules into clean, maintainable code. API Engineering: Design and consume external APIs with a deep understanding of webhooks, callbacks, and complex retry policies.…
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