Senior Backend Developer

As a Senior Backend Developer, you'll take a leading role in designing, building and delivering scalable, high-performance backend systems that power our geospatial data platforms and services. You'll guide technical decision-making, champion engineering best practices, and help shape robust data-driven solutions in the cloud. This is a chance to work with modern Azure technologies, large-scale geospatial datasets, and analytical platforms, while influencing how critical national data services are designed and delivered at Ordnance Survey.

What You Will Be Doing

• Leading the technical delivery of complex backend systems, working closely with architects, delivery managers, and stakeholders
• Designing and implementing scalable, secure, and high-availability services using C# and Azure
• Building and optimising data pipelines and services that leverage OLAP and analytical data platforms
• Working with geospatial datasets and services, ensuring efficient storage, processing, and access
• Coaching, mentoring, and supporting engineers to continually enhance capability across the team
• Operating and improving production systems to ensure robustness, resilience, and reliability
• Sharing best practices and identifying training opportunities to upskill the wider engineering community
• Communicating goals, progress, and technical challenges clearly across teams
• Providing line management support for Engineers and Associate Engineers (as required), OS conducts pre-employment checks for anyone made an offer of employment, including identity, right to work, employment history and criminal record checks (via Disclosure & Barring Services (DBS).

Some of our roles may require additional security vetting. We will advise candidates during the recruitment process if additional vetting may be required for that specific role.

• Proven experience as a senior backend developer with strong expertise in C# / .NET or equivalent language
• Solid experience building cloud-native applications and services on Microsoft Azure
• Hands-on experience with Azure services such as Container Apps, Storage, Azure DevOps, CI/CD, and identity/access management
• Strong experience working with relational and analytical data platforms, including OLAP systems and large-scale data processing
• Experience designing and developing RESTful APIs and distributed systems
• Familiarity with geospatial data concepts, formats, and processing (e.g. spatial databases, GIS tools, or spatial indexing)
• Strong understanding of software architecture, design patterns, and modern engineering practices
• Experience working in agile delivery environments
• A passion for continuous improvement and delivering high-quality, maintainable solutions

We want you to love what you do. That is why our benefits package rewards a job well done.

• Salary £56,312 - £65,697 (dependent on experience)
• Performance related bonus up to 10%
• A competitive pension scheme (OS contributes up to 12.07%)
• 28 days annual leave in addition to bank holidays on joining, (3 taken over Christmas) increasing by one day per year, to a maximum of 5 years
• Enhanced family leave, including up to 12 weeks paid partner (paternity) leave
• Free subscription to OS Maps
• Access to online learning platforms
• Coaching and Mentoring schemes
• Plus, a suite of excellent additional perks and benefits

Ordnance Survey is the national mapping agency for Great Britain, providing world-class geospatial data and services that power innovation, support national infrastructure, and help people make better decisions every day. We're passionate about using cutting-edge technology to solve real-world problems-and we're looking for talented people to join our mission., We embrace a hybrid working model at OS, because we believe in flexibility and balance. You'll be based at our fantastic HQ in Southampton, Hampshire, where you'll spend 50% of your working week collaborating face-to-face with colleagues. It's all about combining the best of both worlds connection and autonomy to help you thrive.