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Senior Python Backend Developer (Services)

payabl. • United Kingdom
Relocation
This Job is No Longer Active This position is no longer accepting applications

We are seeking a Senior Python Backend Developer to join our engineering team and contribute to the evolution of our service layer architecture. The successful candidate will design and build reliable, scalable microservices and work with legacy systems. Strong problem-solving skills, attention to detail, and a deep understanding of backend systems reliability are required.

Key Highlights
Design and build reliable, scalable microservices
Work with legacy systems and extract business logic
Ensure correctness, resilience, and long-term maintainability
Key Responsibilities
Legacy Modernisation: Read legacy code, 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
Greenfield & Refactoring: Split time between building new features from scratch and refactoring existing legacy modules into clean, maintainable code
Technical Skills Required
Python FastAPI MySQL/PostgreSQL
Benefits & Perks
Relocation package
Annual Learning Budget
Wolt allowance
SportsBenefits membership
Complimentary parking space
25 days of vacation + public holidays + 10 days of sick leave
Nice to Have
Experience with PHP, Perl, or JavaScript
Kafka / Redis experience
Docker / CI/CD / Kubernetes familiarity
Financial industry exposure

Job Description

We are looking for a to join our engineering team and contribute to the evolution of our service layer architecture.This role is focused on designing and building reliable, scalable microservices while also working with and gradually transforming legacy systems. You will play a key role in extracting business logic from existing codebases and reimplementing it into modern, maintainable Python services.This is a hands-on engineering role requiring strong problem-solving skills, attention to detail, and a deep understanding of backend systems reliability. Success in this role means going beyond “it works” ensuring correctness, resilience, and long-term maintainability.
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