Senior Backend Developer

What you’ll do

• Design, develop, and maintain scalable backend services using Python and Django, with a strong emphasis on code quality and maintainability
• Integrate with third-party payment services (e.g. banks, card schemes, payment networks) and handle edge cases such as ambiguous or delayed responses, settlement timing, and decline-code variance
• Write robust unit and integration tests for all new features and ensure proper validation for critical payment flows
• Collaborate cross-functionally with product, infra, frontend, mobile, and QA teams to define, design, and ship high-impact features
• Guide and mentor junior and mid-level engineers, providing technical leadership through code reviews, design discussions, and pairing sessions
• Lead by example in enforcing clean architecture, clear documentation, and reliable observability practices
• Identify and resolve performance bottlenecks, improve system resilience, and optimise for correctness and traceability
• Stay up to date with emerging technologies and propose improvements aligned with business goals
• Build software with security and compliance in mind, ensuring proper access control, logging, auditing, and PCI scope discipline
• Deploy applications and support operational readiness of services

What you should have

• Bachelor's degree in Computer Science, Software Engineering, or related field.
• 5+ years of backend engineering experience with Python and Django
• Has owned a backend service in production through multiple incident cycles — knows where the failure modes live in the payment domain.
• Demonstrated track record integrating bank, card, or payment-gateway APIs end-to-end (authorisation, capture, 3DS, webhook handling, reconciliation).
• Strong Python and Django proficiency at production scale.
• Comfortable across asynchronous workers and event-driven patterns (Kafka).
• MySQL at scale — replication, read-replica patterns, sharding, schema-migration discipline.
• Redis for cache, session, and queue patterns.
• Hands-on with payment-grade security controls — KMS-backed envelope encryption, signed webhooks, secret management, OWASP-aware coding.
• Cloud infrastructure on GCP (AWS acceptable); IaC familiarity (Terraform).
• CI/CD pipelines with SAST, SCA, and secret-scanning gates.
• Strong technical communication in English; comfortable writing design documents and ADRs.
• Has owned incidents end-to-end including post-mortems and corrective-action follow-through.