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# Senior Software Engineer

- **Company:** Assystem UK Ltd
- **Location:** Rangeworthy, UK
- **Experience:** Expert
- **Contract:** Permanent contract
- **Skills:** Microsoft Word, Microsoft Excel, Application Programming Interfaces (APIs), Software Applications, Automation of Tests, Microsoft Azure, Code Review, Databases, Continuous Integration, Data as a Services, Relational Databases, Secure Coding, Systems Integration, Enterprise Software Applications, Backend, SC Clearance, Solid Principles
- **Published:** October 22, 2026
- **Apply:** https://www.apply4u.co.uk/jobs/senior-software-engineer/52837471

## About the Role

security and maintainability Work across back end services, integrations and user-facing applications Contribute to engineering standards through code review, testing, CI/CD and documentation Design secure APIs and integrations across digital products, enterprise systems and data services Work closely with data engineers on APIs, events and data contracts Support and mentor others through pairing, review and day-to-day collaboration Help make sensible technology choices that keep solutions supportable over time Qualificationsð Essential Skills 8 years experience Practical use of, or strong interest in use of AI-assisted development tools in a responsible delivery environment Experience delivering production software end to end, working closely with stakeholders Front end, back end development experience Experience designing APIs and integrating with enterprise systems and data services Good understanding of software design principles and modern engineering practice Experience with
automated testing and CI/CD Experience working with relational databases Familiarity with database and caching technologies Understanding of secure coding and modern authentication and authorisation Experience delivering software in cloud-hosted environments, e.g. Azure Ability to work effectively across a mixed technology estate Strong communication skills and experience working in collaborative teams Experience mentoring others through review, pairing and practical support ️ Desired SkillsExperience with container tooling Familiarity with Microsoft tooling, including Power Platform Experience with Office document automation, including Excel, Word and PDF generation Security and eligibility Depending on project requirements, you may need to meet UK residency criteria and achieve UK security clearance, such as BPSS and potentially SC. Additional InformationYou do not need deep expertise in all of these, but you should be comfortable learning and contributing across a varied environment.
Our current stack includes, but is not limited to

## Description

Excellence Centre (DEC) UK. You will help design, build and support secure, maintainable software products and reusable components that improve performance, decision-making and delivery across the business and for our clients. This is a hands-on role in a small, senior team, with real scope to influence technical direction, engineering standards and solution design. You will work across a varied technology environment, contribute from discovery through to production support, and collaborate closely with colleagues in the UK, India and, where relevant, France. We are not looking for someone who knows every tool in our stack. We are looking for strong engineering fundamentals, sound judgement, adaptability and a practical approach to solving problems. What you will do Work closely with senior stakeholders to understand requirements Design, build, test, deploy and support software applications, services and reusable components Produce pragmatic technical designs that balance quality