Senior Software Engineer

Join OneAdvanced

What if you could combine challenging software engineering with the opportunity to make a genuine difference to healthcare?

At OneAdvanced, we're evolving Vision, a large-scale clinical practice management system used by GP surgeries and healthcare clinics. Thousands of clinical users rely on our software to support patient care, making reliability, quality and innovation essential.

We're looking for an experienced Senior Software Engineer to help shape the future of this mission-critical product. You'll work across a complex, established codebase, modernising technology, developing new capabilities and using agentic AI tools to transform how we build and test software.

Working with C++, COM and C#/.NET, you'll tackle substantial engineering challenges while helping move Vision towards a more modern, maintainable architecture. It's an opportunity to combine strong engineering fundamentals with emerging AI-enabled development practices and see the real-world impact of your work. 

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What You Will Do

• Develop, maintain and enhance Vision across a complex codebase spanning C++, COM and C#/.NET.
• Diagnose challenging issues and improve system reliability, performance, maintainability and test coverage.
• Support the modernisation of legacy C++ and VB6 functionality towards modern .NET solutions.
• Work with SQL databases, COM interop and established data access technologies.
• Contribute to new web-based workflows through our IQHealth platform, improving experiences for GP practices and clinical users.
• Use agentic AI development and testing tools to accelerate engineering workflows, explore solutions and improve software quality.
• Review and validate AI-generated code, applying sound engineering judgement to ensure changes are secure, reliable and appropriate for a clinical environment.
• Develop and maintain integrations with NHS systems and relevant healthcare standards.
• Contribute to technical design, code reviews and automated testing, collaborating with Product and QA teams to deliver effective solutions.

What You Will Have

Must Have:

• Commercial experience developing complex software using MS C++ and C#/.NET.
• Experience with Windows desktop applications, ideally Windows Forms, and a strong understanding of maintaining and evolving established systems.
• Experience working with large codebases, diagnosing complex issues and understanding dependencies across application components.
• Solid SQL and relational database development skills; PostgreSQL experience is preferred.
• Experience using Visual Studio and MSBuild in a commercial development environment.
• An understanding of COM, OLE and interoperability concepts.
• An understanding of Windows APIs.
• A commitment to clean, maintainable code, appropriate testing and high engineering standards.

Highly Desirable:

• Experience with COM-based systems, VB6 or VB.NET and legacy modernisation.
• Practical experience with agentic AI development tools, AI coding assistants or AI-enabled testing.
• Curiosity about AI-assisted software engineering and the ability to critically assess AI-generated code.
• Experience in healthcare, regulated or safety-critical software environments.
• Knowledge of NHS integrations, clinical systems or SNOMED CT.
• Experience with unit testing frameworks and Ranorex or comparable testing frameworks.
• Experience navigating large solutions with many interconnected projects.
• Familiarity with Git or Perforce, Jira and Confluence.

Success Measures

• Deliver high-quality software that meets requirements and minimises post-release defects.
• Improve system reliability, maintainability and automated test coverage.
• Contribute to modernisation initiatives that support Vision's long-term evolution.
• Use AI-enabled development and testing to improve productivity without compromising quality or safety.
• Meet applicable NHS assurance and information governance requirements, maintaining a strong focus on clinical safety and data integrity.
• Communicate technical decisions clearly and collaborate effectively across engineering, product and QA.
• Contribute to thoughtful technical design, code reviews and continuous improvement.

Key Relationships

• Engineering teams and technical leadership.
• Product Managers and Product Owners.
• QA and software testing teams.
• External stakeholders, including NHS authorities and health boards.

Capabilities & Behaviours

• Enjoys solving complex engineering problems and improving established systems.
• Takes pride in writing reliable, maintainable software and making sound technical decisions.
• Understands the responsibility involved in developing software that supports clinical care.
• Embraces modern engineering practices and is curious about how agentic AI can improve software development.
• Applies critical thinking when evaluating AI-generated code and changing complex systems.
• Collaborates openly, shares knowledge and constructively challenges ideas to achieve better outcomes.
• Balances pragmatic delivery with long-term technical quality and continuous improvement.

What We Do For You

Wellbeing that means something

• 26 days’ holiday + bank holidays (and the option to buy more) plus 1 paid volunteering day every year
• Exceptional family leave, 26 weeks fully paid maternity/adoption, 4 weeks fully paid paternity, 22 weeks fully paid shared parental leave, plus 5 days paid bereavement leave
• Robust sick pay of up to 13 weeks full pay + 13 weeks half pay
• 24/7 Employee Assistance Programme for confidential support
• Private medical insurance for everyone, no medical-history exclusions

Financial benefits that have your back

• Performance-based rewards tailored to your role, from company-wide bonuses to OTE and commission structures
• Income protection: up to 75% salary for 5 years if you ever need it
• Pension with 5% matched company contributions
• Life assurance worth 4x your salary from day one
• Free financial planning session with the option to engage in more tailored financial coaching.

Grow your career with us

• SkillsHub learning platform with leadership pathways, future-manager training, and a huge online library
• Access to external training and apprenticeships

Making a Difference

• MatchIt! Fundraise for a cause close to your heart and OneAdvanced will match part of the funding
• Pennies from Heaven donate the pennies from your pay check to help make a difference without lifting a finger

Plus plenty other flexible benefits to suit your lifestyle on our RewardHub, including:

• ULEV car scheme with 1,000+ models
• Dental insurance, Health Cash Plan, Critical Illness Cover, Partner Life Cover, Health Assessment, Gym Membership

Who We Are

At OneAdvanced, we are at the forefront of delivering sector-focused technology solutions that simplify complexity, drive meaningful progress, and help build a fairer, more inclusive society.

We’re much more than a software company. We deliver SaaS workflow applications and IT services that power organisations across Education, Government, Healthcare, Legal, Manufacturing, Housing, Retail, and more.

OneAdvanced is one of the UK’s largest business software and services companies. Based in Birmingham (The Mailbox), operating across the UK, Ireland, India, and Australia.

Our secure, scalable platform, including OneAdvanced AI, our private AI service for UK organisations, powers connectivity and innovation across critical sectors. Alongside our software are our IT services, including hosting, managed services, and application modernisation.

We strive to create an inclusive workplace that drives innovation and collaboration, championing diverse perspectives and ideas. Our Environmental, Social and Governance (ESG) strategy is embedded in everything we do, guiding us to create meaningful impact for our people, our customers and the planet.

Proud to be recognised in the Financial Times’ Best Employers 2026 list for the second-year running, an independent and data led ranking based on employee feedback. Join us and become part of a team that’s powering the world of work and making a real difference.

Join us and become part of a team that’s powering the world of work and making a real difference.

Learn more at www.oneadvanced.com