Senior Software Engineer

Role Introduction

As a Senior Software Engineer, you will be a technical leader and architect, taking full ownership of modernizing and scaling our enterprise-grade product. Within your first year, you will have led major feature rollouts, improved system scalability, and mentored the engineering team, driving technical excellence across the board.

What You Will Do

• Architect and implement scalable, maintainable backend systems in C# / .NET (Framework + Core)
• Lead WiseJ-based UI development to deliver seamless user experiences
• Design and maintain secure, high-performance APIs
• Optimize SQL Server databases, ensuring high availability and performance
• Deploy and maintain cloud-native solutions using Microsoft Azure services
• Champion agile methodologies and participate in planning, demos, and retros
• Conduct peer code reviews, mentor developers, and uphold code quality standards
• Stay ahead of tech trends and recommend tools or practices to improve productivity
  
  

What You Will Have

As a Senior Software Engineer, you will have:

• 6–9 years of full-stack development experience with .NET (C#)
• Deep understanding of WiseJ,Vue J or similar UI frameworks
• Proven track record building REST APIs with .NET Core
• Strong skills in SQL Server – schema design, query tuning, and optimization
• Hands-on experience with Microsoft Azure – App Services, Azure SQL, DevOps
• Familiarity with software architecture principles and modern design patterns
• Strong leadership, communication, and mentorship capabilities
  
  

What We Do For You

• Wellbeing focused – Our people are our greatest assets, and ensuring everyone feels their best self to come to work is integral.
• Annual Leave – 20 days of annual leave, plus public holidays 
• Employee Assistance Programme – Free advice, support, and confidential counselling available 24/7.
• Personal Growth – We’re committed to enabling your growth personally and professionally through development programmes.
• Life Insurance - 2x annual salary
• Personal Accident Insurance - providing cover in the event of serious injury/illness.
• Performance Bonus – Our Group-wide bonus scheme enables you to reap the rewards of your success.
  
  

Who We Are

OneAdvanced is one UK's largest providers of business software and services serving 20,000+ global customers with an annual turnover of £330M+. We manage 1.5 million 111 calls per month, support over 2 million Further Education learners across the UK, handle over 10 million wills, and so much more. Our mission is to power the world of work and, as you can see, our software underpins some of the UK's most critical sectors.

We invest in our brilliant people. They are at the heart of our success as we strive to be a diverse, inclusive and engaging place to work that not only powers the world of work, but empowers the growth, ambitions and talent of our people.

To learn more about working at OneAdvanced please click here