Principle and Senior Backend Software Engineer (.NET)

Recenso Services Ltd; Greater London; On-site; GBP 150,000 - 200,000; Full time

Job summary

A leading technology company in the UK is seeking a highly skilled Principle and Senior Backend Software Engineer to design and develop backend services for IoT products. The ideal candidate will have strong .NET/C# skills and experience with automated testing. This role offers a permanent position with a strong salary, bonus, and equity options, and will be pivotal in building a new engineering organization within the company, focused on scalability and performance.

Benefits

Strong Salary

Bonus

Equity

Qualifications

• Strong coding skills in .NET / C#.
• Experience with automated testing frameworks like NUnit.
• Ability to design clean, scalable, maintainable architectures.

Responsibilities

• Build and maintain backend systems using .NET / C#.
• Design clean, scalable architectures.
• Contribute to high automated test coverage.
• Translate business requirements into backend solutions.
• Collaborate with cross-functional teams.
• Solve complex technical challenges.

Skills

.NET / C#

Automated Testing

NUnit

Clean code practices

Job description

Principle and Senior Backend Software Engineer (.NET)

Location: North London/Hertfordshire
Type: Permanent | Strong Salary + Bonus + Equity
Right to Work: UK work eligibility required (no sponsorship)

What We’re Looking For

We’re searching for a highly skilled Principle and Senior Backend Engineer with fast, accurate coding skills and a passion for building scalable, reliable systems.

You will play a critical role in designing and developing backend services that power IoT products used across high-integrity industries including Fire, Security, Telecare, Retail, Water, and National Infrastructure.

The Role

You will:

• Build and maintain backend systems using .NET / C#
• Design clean, scalable, maintainable architectures
• Contribute to high automated test coverage across all services
• Translate business requirements into secure, performant backend solutions
• Collaborate closely with front-end, QA, product, and platform teams
• Solve complex technical challenges with elegant, thoughtful solutions

Our Technical Environment

• Backend: .NET / C#
• Automated Testing: NUnit
• Solution Testing: Playwright
• Strong focus on:
  • Reliability and performance
  • Clean, maintainable code
  • High-level automated test coverage
  • Scalable, production-ready services

Our Culture

We’re building a team centred on collaboration, inclusion, and engineering excellence. You’ll be joining an environment where people feel supported, challenged, and empowered.

This is an exceptional opportunity to join a growing British IoT leader at a pivotal moment and contribute to the foundation of a brand-new engineering organisation.