Senior Full Stack Developer (.NET and React, Retail)

Application Deadline: 24 June 2026 Department: IT Location: London Description At Mountain Warehouse, we understand that IT is core to our success as a business, so we invest heavily in our in-house team. The development department is divided into product-based teams, all using variants on Kanban for project prioritisation and a focus on continuous delivery, mostly with usage of microservices. We are a collaborative team with a strong culture of code reviews, occasional pair programming and plenty of unit testing. We’re keen to write code following best practices and to continuously find ways to improve. The work is a mixture of greenfield and legacy projects (much like any mature organisation) using React, React Native, Typescript, C#, and MongoDB. However, our microservices approach allows us to alter the technology as appropriate. Key Responsibilities We are looking for an experienced senior developer to join our Retail Development team. The team is responsible for custom applications on our store handheld devices, store administration and reporting via online portals, and ETL to/from our ePOS solutions. We Would Like To Meet Someone Who Is • Minimum 6 years of solid C# in a commercial environment • Minimum 4 years of commercial experience with React and TypeScript • Commercial experience with databases (either document or relational) and an openness to working with both SQL Server and MongoDB. • Produces initial results rapidly and iterate based upon feedback. • Knowledge of microservice design principles (preferably with commercial experience). • Effective communicator and Excellent communication skills. • Makes pragmatic implementation decisions and can fail fast if an approach is not working. • Understands projects and project goals in depth. • Experience or willingness of mentoring junior members of a team. • A strong desire to create high-quality, tested code. Desirable experience / behaviours • ReactNative experience (commercial or personal projects). • Jest, React Testing Library. • Offline-first data synchronization using a local on-device database (Ditto, Couchbase Mobile, Firebase, etc.) • Has at least one subject area with deep knowledge. • Coaches / mentors more junior team members or shares knowledge back to wider team. This is selection of what we’re using across the department Although experience of all of these is not necessary (we’re happy to train up) - as senior developer, you should be well versed in a number of these technologies. • .Net (8.0+). • RabbitMQ / MassTransit. • Microservices. • Micro-frontend. • React. • React Native. • MongoDB. • Entity Framework. • MVC. • RESTful API design / Web.API. • Azure. • Jenkins. • k8s. • GitFlow. Benefits • Competitive salary and benefits package • REMOTE working • Holiday allowance • 50% staff discount & 25% for family and friends • Pension scheme