Job Description
We are looking for a highly specialized Senior Backend Engineer to join our team as a technical cornerstone for one of our key UK-based fintech partners. In this role, you will be responsible for the development and maintenance of high-quality, production-grade server-side logic designed to empower and scale small businesses globally. As a Senior specialist, you will view backend development as a craft. You will be embedded in a global product team building and operating the microservices that power financial services for hundreds of thousands of small businesses in the UK and India. The platform infrastructure already exists — your job is to build on top of it with the reliability, security, and correctness that fintech demands. We need a professional who writes code that is correct in adversarial conditions, at scale, and in the context of financial data. You must be able to justify every architectural decision with depth: not just identifying what is wrong, but explaining why it breaks and how to fix it properly. Experience with distributed systems patterns such as idempotency, saga patterns, and circuit breakers is essential — these are daily tools, not theoretical concepts. Requirements Must Have 7+ years of professional experience: in backend development, with at least 5 years dedicated to the Python ecosystem as your primary language. Python Framework Mastery: Expert-level proficiency in Django, FastAPI, and Flask, understanding when to use each based on project needs (monolithic vs. high-performance microservices). Solid Engineering Fundamentals: Deep understanding of SOLID principles, design patterns, and ACID properties in database transactions — and the ability to justify their application with concrete reasoning. Distributed Microservices Patterns: Proven, practical experience designing and operating microservices at scale. This includes idempotency (implementing idempotency keys, safe retries, and explaining what breaks without them), saga and outbox pa
