Principle and Senior Backend Software Engineer (.NET)

Recenso; Greater London; On-site; GBP 90,000 - 150,000; Full time

Job summary

A leading IoT technology firm is seeking a highly skilled Principle and Senior Backend Engineer (.NET) to design and develop critical backend services for IoT products. The role involves building scalable systems, ensuring high automated test coverage, and collaborating with various teams to create secure solutions. This position offers a strong salary, bonus, and equity in a supportive work culture centered on engineering excellence.

Qualifications

• Strong experience with .NET and C#.
• Proven track record of building scalable and maintainable systems.
• Ability to contribute to high automated test coverage.
• Translate business requirements into secure, performant backend solutions.
• Contribute to high automated test coverage across all services.

Responsibilities

• Design and develop backend systems for IoT products.
• Collaborate with front-end, QA, product, and platform teams.
• Translate business requirements into secure, performant solutions.
• 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

Skills

.NET / C#

Automated Testing (NUnit)

Clean Code

Collaborative Working

Performance Optimization

Tools

NUnit

Playwright

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.