Senior Software Engineer; C# ​/.NET

Job Title

Senior Software Engineer (C# / .NET)

Sage is a forward‑thinking technology company that specializes in software. The team you’d be applying for models itself on creating a robust culture of belonging. We pride ourselves on fostering a fast‑paced, innovative environment where experimentation and continuous improvement are highly valued. Our infrastructure is built on AWS, enabling us to deliver robust and scalable solutions to our clients.

You will be supported by being positioned in a squad with a strong lead, principal, senior, mid‑level and graduate engineers who will support your growth as well as a leader who will invest in your career.

This is a hybrid role – three days per week in our Newcastle office.

• Design, develop, and maintain scalable and high‑performance APIs and backend services using C#, .NET and nodejs Technologies.
• Collaborate with global teams across Sage, to define, design, deliver and maintain services across the Payroll and HR Business Unit.
• Work cross‑functionally with various Sage teams:
  Product management, QA/XD, various product lines and business units to deliver for our customers.
• Ensure the performance, quality, and responsiveness of applications.
• Resolve defects/bugs during QA testing, pre‑production, production, and post‑release patches.
• Help maintain code quality, organization, and automatization.
• Utilize AWS services to build, deploy, and manage applications.
• Experiment with new technologies and methodologies to improve our development processes and product offerings.
• Participate in code reviews, providing constructive feedback to peers.
• Maintain relevant documentation to describe logic, coding/configuration, testing and changes where applicable.
• Contribute to the continuous improvement of our software development lifecycle.
• Be an active and enthusiastic team player. Partner effectively with all team members to deliver against commitments.

• Extensive experience in software development with a focus on C#, .NET and/or nodejs.
• Experienced in building and consuming APIs and backend services.
• Knowledge of AWS services (e.g., EC2, S3, RDS, Lambda, API Gateway, Document
  
  DB etc.).
• Proven experience with Agile Development, SCRUM, and/or Extreme Programming methodologies.
• Experience with relational databases would be beneficial (e.g., SQL Server, MySQL) and/or No
  
  SQL databases (e.g., Dynamo
  
  DB, Mongo
  
  DB).
• Experience with version control in Git and CI/CD pipelines.
• Strong problem‑solving skills and attention to detail.
• Ability to work effectively in a fast‑paced, agile environment.
• Good communication and collaboration skills.
• Bachelor’s degree in Computer Science, Engineering, or a related field, or equivalent work experience.

Product Delivery

United Kingdom

Newcastle

Hybrid

Working at Sage means you’re supporting millions of small and medium sized businesses globally with technology to work faster and smarter. We leverage the future of AI, meaning business owners spend less time doing routine tasks, like entering invoices and generating reports, and more time pursuing their ambitions.

Our colleagues are the best of the best. It’s why we were awarded 2024 Best Places to Work by Glassdoor. Because to achieve extraordinary outcomes, we need extraordinary teams. This means infusing Sage with people who knock down barriers, continuously innovate, and want to experience their potential.

Learn more about working at Sage:

Watch a video about our culture:

We celebrate individuality and welcome you to join us if you embrace all backgrounds, identities, beliefs, and ways of working. If you need support applying, reach out at

Learn more about DEI at Sage: