Role Summary

We are looking for a Senior Back-End Developer to become the technical anchor of our newly forming in-house engineering team. Our platform is built on a suite of .NET microservices, backed by PostgreSQL and Redis, running on Google Cloud Platform (GKE) and delivered through GitLab CI/CD. You will take deep ownership of this codebase: leading its ongoing development, raising engineering standards, and guiding the work of other developers as the in-house team grows.

This is a senior, high-influence role in a regulated payments business. The services you build and harden move real money; correctness, resilience, and security are not nice-to-haves here, they are the job.

Key Responsibilities

Lead the design, development, and maintenance of our .NET microservices, from API design through to data modelling and integration
Take ownership of the codebase: drive code quality, architectural coherence, and technical debt reduction across services
Design robust, well-tested services for payments, FX, and treasury workflows, with strong attention to correctness, idempotency, and auditability
Work with PostgreSQL and Redis for transactional data and caching, with an eye on performance and integrity
Contribute to and improve GitLab CI/CD pipelines, including automated testing, quality gates, and safe release practices
Mentor and review the work of other developers, in-house and external, setting the bar for engineering standards
Collaborate with our DevOps function on observability, reliability, and secure deployment onto GKE
Build with security and regulatory expectations in mind, and support audit and banking partner requests with technical input where needed

Our Expectations

Extensive commercial experience building production back-end systems in C# / .NET, including microservice architectures
Strong API design skills (REST) and experience with inter-service communication patterns, messaging, and resilience techniques
Deep working knowledge of PostgreSQL (schema design, query performance, transactions) and practical experience with Redis
Experience running containerised services in Kubernetes; GKE experience is a plus
Solid grounding in automated testing and CI/CD; GitLab experience is advantageous
A track record of leading by example: raising standards through code review, mentoring, and pragmatic technical leadership
Experience in payments, fintech, or another regulated environment is strongly advantageous
Clear communication skills and the judgement to make sound technical decisions in a small, fast-moving team

Senior Back-End Developer (.NET)