Senior Backend Developer

Senior Backend Developer

Salary £56,312 - £65,697 (dependent on experience)

Hybrid working; based at our HQ in Southampton, Hampshire.

Lead the design, build and delivery of scalable, high‑performance backend systems that power our geospatial data platform. Champion engineering best practices, guide technical decision‑making and shape robust data‑driven solutions in the cloud using Azure technologies.

• Lead technical delivery of complex backend systems, working closely with architects, delivery managers and stakeholders.
• Design and implement scalable, secure, and high‑availability services using C#/.NET on Azure.
• Build and optimise data pipelines and services that leverage OLAP and analytical data platforms.
• Work with geospatial datasets and services, ensuring efficient storage, processing, and access.
• Coach, mentor and support engineers to enhance capability across the team.
• Operate and improve production systems to ensure robustness, resilience and reliability.
• Share best practices and identify training opportunities to upskill the wider engineering community.
• Communicate goals, progress and technical challenges clearly across teams.
• Provide line‑management support for Engineers and Associate Engineers as required.

• Proven experience as a senior backend developer with strong expertise in C#/.NET or equivalent language.
• Strong experience building cloud‑native applications and services on Microsoft Azure.
• Hands‑on experience with Azure services such as Container Apps, Storage, Azure Dev Ops, CI/CD and identity / access management.
• Experience with relational and analytical data platforms, including OLAP systems and large‑scale data processing.
• Design and development of 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.
• Passion for continuous improvement and delivering high‑quality, maintainable solutions.

• Salary £56,312 - £65,697 (dependent on experience).
• Performance‑related bonus up to 10 %.
• Competitive pension scheme (OS contributes up to 12.07%).
• 28 days annual leave in addition to bank holidays on joining, 3 taken over Christmas. Increases 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.
• Additional perks and benefits (including extra days’ leave, employee assistance programme, hybrid working, free onsite parking, flexible working hours, eye‑care vouchers, nursery discount, cycle to work scheme, charity volunteering day and match funding).

Hybrid working model – 50% of the week at our HQ in Southampton, with flexibility to combine face‑to‑face collaboration and autonomous work.

OS conducts pre‑employment checks, including identity, right to work, employment history and criminal record checks (DBS). Some roles may require additional security vetting. Must have the right to work in the UK; visa sponsorship is not available.

Closing date: 15 June 2026 @ 23:59 pm.

Interviews via Teams.

We are committed to building a diverse, inclusive and welcoming workplace. We encourage applicants whose experience does not match every point to apply, as they may still be a good fit for this or other opportunities. Reasonable adjustments can be considered during the recruitment process.

We are Ordnance Survey, Great Britain’s national mapping service and a pioneer in geospatial technology. With over 230 years of trusted data, we empower better decisions, deeper understanding and meaningful connections to the places we live, move through, and care for.