Senior Backend Developer (Services)

We're powering the growth of merchants by helping them take payments easily, securely and globally.

• 5+ years of backend engineering experience with strong Python expertise.
• Deep AsyncIO proficiency for building non-blocking, high-reliability microservices.
• Production-grade experience with FastAPI.
• Experience with MySQL and/or PostgreSQL including query design, schema understanding, and migration strategies.
• Experience writing unit and integration tests (pytest preferred).
• Expertise in designing and consuming external APIs with webhooks, callbacks, and retry policies.
• Willingness to take full ownership of high-traffic, always-up applications.
• Comfortable working in complex distributed environments where reliability is critical.
• Ability to write clean, intentional code and explain engineering decisions.
• Strong English communication skills, both written and verbal.

Nice to have:

• Experience with PHP, Perl, or JavaScript for legacy code comprehension.
• Kafka and Redis experience.
• Familiarity with Docker, CI/CD, and Kubernetes.
• Exposure to financial industry domains such as fintech, payments, 3DS, Token Management Systems, or payment gateway integrations.
• Proven track record of migrating systems from one language or paradigm to another.

Legacy Modernisation:

• Read legacy code (PHP, Perl, or JavaScript), extract business logic, and reimplement it within a modern microservices architecture.

Reliability First:

• Ensure idempotency, data integrity, and graceful error handling across all services.

Greenfield & Refactoring:

• Build new features from scratch and refactor existing legacy modules into clean, maintainable code.

API Engineering:

• Design and consume external APIs with understanding of webhooks, callbacks, and complex retry policies.

Agile Collaboration:

• Maintain clean and strong English communication to collaborate with multiple stakeholders in agile sprints.

Product Thinking:

• Understand business logic and end-user impact beyond coding.

Infrastructure Contribution:

• Contribute to CI/CD pipelines, Docker, or Kubernetes infrastructure.

Innovation:

• Propose tools or technologies to improve performance, security, or development speed.

The benefits listed are for the Cyprus office location only; benefits and contract type will be discussed based on candidate location during the interview process.