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.
Responsibilities
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)
Requirements
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
The Rewards
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
At OS, we believe looking after your health and wellbeing means more than posters and events. We empower you to manage your work and life the way you need it by offering things like
An extra days' leave for each year you work, up to 33 days
Employee Assistance Programme
Hybrid working
Free onsite parking at our modern HQ in Southampton
We adopt flexible working and can consider different working hours dependent on the role and your personal circumstances
Eyecare Vouchers
OS Explorers Nursery discount
Cycle to Work scheme
We believe that as a company we should give back wherever we can, so we give you 1 day a year to volunteer for charities that are important to you, as well as offering a match funding scheme
Location & Working Pattern
Security & Eligibility
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.
Benefits
Health insurancePaid time offFlexible schedulePerformance bonus
Additional Information
Senior Backend Developer
Salary £56,312 - £65,697 (dependent on experience)
Hybrid working
Southampton
A bout Ordnance Survey
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.
Ordnancesurvey · Southampton, UK