Senior Software Developer

STERIS; East Midlands; On-site; GBP 45,000 - 65,000; Full time

Job summary

STERIS is currently recruiting for a Senior Software Developer in East Midlands, England. This role involves designing, building, and maintaining critical software solutions across legacy and modern systems, emphasizing leadership and technical expertise.

Successful candidates will have over 5 years of software development experience, with strong skills in C#, .NET, ASP.NET MVC, and modern front-end technologies such as React. Join STERIS to make a difference in patient care and learn in a supportive environment.

Qualifications

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

Responsibilities

• 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, and ASP.NET Core.
• Develop and support React based web front ends in collaboration with Product and UX stakeholders.
• Ensure software solutions are secure, scalable, maintainable, and well documented.
• Work effectively within Agile delivery processes.

Skills

C#

.NET

ASP.NET MVC

ASP.NET Core

SQL Server

React

JavaScript

HTML5

CSS

Git

Job description

We are currently recruiting for a Senior Software Developer vacancy. This is an excellent opportunity to join us at a specialist level in a division that drives the business forwards through innovation.

What You Will Do

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.

• 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

Working at STERIS, you GROW, LEARN, and MAKE A DIFFERENCE.

At STERIS, we are a leading global provider of products and services that support patient care with an emphasis on infection prevention. Our mission is to help our customers create a healthier and safer world.

STERIS strives to be an Equal Opportunity Employer.