Software Development Engineer III (.NET/Java)

Salary: £36,000 - 76,000 per year

Requirements:

• Experience using .Net/C# and/or Java with an eagerness to take on new technologies.
• Experience with both SQL/NoSQL databases.
• Experience with cloud platform(s) (e.g. AWS, Azure, etc.).
• Experience of working in agile environments and TDD.
• Excellent interpersonal skills.
• Experience with ecommerce payment systems would be a nice to have but is not crucial.

Responsibilities:

• Use in-depth knowledge of .Net and the tool ecosystem to develop and implement scalable frontend systems.
• Produce test-driven features and demonstrate familiarity with the TDD cycle.
• Apply understanding of software design principles to build well-structured, maintainable systems.
• Work effectively with product stakeholders to communicate and translate needs into product improvements.
• Break down work so we can deliver value incrementally and manage risk on larger projects.
• Facilitate group discussions on system design and work with Product Managers to drive value.
• Support production systems, resolve incidents, and learn from them.
• Share knowledge with the wider engineering community.
• Mentor and develop others around you.
• Produce proof of concepts to evaluate new tools.

Technologies:

• AWS
• Azure
• C#
• Cloud
• Cassandra
• DevOps
• Docker
• Frontend
• HTTP
• Support
• Java
• NoSQL
• REST
• SQL
• TDD
• ASP.NET
• Mobile
• Network

More:

We are the payments service team at Tesco Technology, serving 28 million+ shoppers in the UK and abroad. We deliver HTTP services that manage payments at global scale, detect and prevent fraud, and help reduce loss across a huge volume of transactions and events. Our APIs support cash, card, gift card, wallet behaviours, repeat payments, refunds and identity checks across stores, fuel stations and online. This Senior Software Developer role focuses on high-impact, business-critical systems, with a strong engineering culture built around .NET/C#, Java, Cassandra, Docker, HAProxy, Azure DevOps, TDD, automation, and a you build it, you run it DevOps approach. We offer a colleague benefits package including an annual bonus of up to 20% of base salary, 25 days holiday plus a personal day and bank holidays, private medical insurance, enhanced family leave, and access to a free 24/7 virtual GP service and Employee Assistance Programme. We are based in London with a hybrid working model, spending 60% of the week collaborating in our office locations or local sites and the rest remotely. We are committed to flexible working, inclusion, and an accessible recruitment process.

last updated 35 week of 2026