> Markdown version of [/jobs/ext/2813104-senior-back-end-developer-net](https://www.wearedevelopers.com/jobs/ext/2813104-senior-back-end-developer-net). Every page supports `.md` or `Accept: text/markdown`. Links point to the HTML versions so they work for humans too. Agent guide: [/agents.md](https://www.wearedevelopers.com/agents.md).

---

# Senior Back-End Developer (.NET)

- **Company:** REMIUM
- **Location:** London, UK
- **Experience:** Expert
- **Contract:** Permanent contract
- **Skills:** Query Performance, .NET Framework, Automation of Tests, C Sharp (Programming Language), Software Quality, Code Review, Continuous Integration, DevOps, PostgreSQL, Redis, Transaction Data, Google Cloud, Software Security, Caching, Technical Debt, Backend, Gitlab, Gitlab-ci, Kubernetes, Api Design, Microservices
- **Published:** September 10, 2026
- **Apply:** https://www.collegerecruiter.com/job/2847391086-senior-back-end-developer-net

## About the Role

* 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

## Description

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., * 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
 * Extensive commercial experience building production back-end systems in C# / .NET, including microservice architectures