Senior Software Developer

Do you want to spend your working time making a difference in the world around you? Are you motivated by impactful work? Do you have a passion for software that directly contributes to patient safety, and troubleshooting complex challenges? If so, then a career with STERIS in our Software Development team could be a great fit for you.

The Senior Software Developer is a hands‐on, technically experienced engineer responsible for designing, building, and maintaining business‐critical software across both legacy on‐premise systems and modern web platforms. This role balances the maintenance and evolution of existing C#/.NET, WPF, WCF, and SQL‐based applications with the delivery of new functionality using modern .NET, web, and front‐end technologies.

The Senior Software Developer works with a high degree of autonomy, contributes to technical decision‐making, mentors other engineers, and helps drive improvements in code quality, system reliability, and engineering practices. This is a technical role with no formal line‐management responsibility.

What You Will Do

• Design, develop, test, and maintain software across legacy on‐premise systems and modern web‐based applications.
• Build and enhance solutions using C#, SQL Server, ASP.NET MVC, ASP.NET Core, and modern .NET versions.
• Maintain, refactor, and modernise existing WPF and WCF applications where appropriate.
• Develop and support React based web front ends in collaboration with Product and UX stakeholders.
• Design and implement RESTful APIs and service based integrations.
• Ensure software solutions are secure, scalable, maintainable, and well documented.
• Provide technical leadership through mentoring, code reviews, and setting engineering best practices.
• Contribute to technical design, estimation, and architectural discussions, acting as an escalation point for complex issues.
• Identify, prioritise, and reduce technical debt and operational risk.
• Work effectively within Agile delivery processes, collaborating closely with QA, DevOps, and cross functional teams.

Required Experience

• 5+ years of professional software development experience
• Proven experience working with complex, production legacy systems as well as modern application stacks
• Demonstrated ability to work independently, take ownership, and deliver high‐quality solutions

Core Technical Skills

• Strong proficiency in C# and .NET
• Experience with ASP.NET MVC and ASP.NET Core
• Experience maintaining and evolving WPF and WCF applications
• Solid SQL Server knowledge, including data modelling and performance considerations
• Source control using Git

Modern Web & Front-End Skills

• Experience building or supporting applications using React (TypeScript preferred)
• Strong understanding of modern JavaScript, HTML5, and CSS
• Experience consuming and designing APIs

Engineering & Delivery Practices

• Automated testing (unit, integration, API)
• CI/CD pipelines (e.g. Azure DevOps, GitHub Actions, or similar)
• Agile delivery methodologies
• Secure coding and performance optimisation practices