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- Tasks: Design and build impactful APIs for AI-driven products and integrations.
- Company: Fast-growing SaaS business with a focus on modern software solutions.
- Benefits: Competitive salary, flexible work, and opportunities for professional growth.
- Why this job: Take ownership of backend engineering and work on projects that truly matter.
- Qualifications: Experience in C# .NET, SQL, and designing RESTful APIs.
- Other info: Dynamic team environment with real career advancement potential.
The predicted salary is between 43200 - 66000 £ per year.
We are exclusively supporting a fast-growing SaaS business building modern software used by tens of thousands of customers across the UK and beyond. This is not about building thin wrapper APIs around legacy systems. The focus here is on API infrastructure that powers core products, third-party integrations and AI services, including systems that automate real end-to-end workflows, not just surface-level features.
They are now hiring a Software Engineer to take real ownership of how services connect, scale and stay secure, while enabling new AI-driven capabilities across the platform. If you enjoy building production-grade APIs that sit at the heart of real products, not just support tools, this is exactly that kind of role.
What you will be doing:
- You will design and build APIs that enable products, partners and AI services to work together, including:
- Building RESTful APIs using C# .NET, SQL and Azure
- Implementing secure authentication using OAuth, JWT and modern security patterns
- Exposing product capabilities for AI services and third-party integrations
- Producing clear API documentation using OpenAPI / Swagger
- Improving reliability with logging, monitoring and strong error handling
- Supporting CI/CD pipelines for automated testing and deployment
- Working closely with product and AI platform teams on how services are consumed
This is a role with real technical ownership, not just tickets passed down a queue.
What they are looking for:
This suits someone who enjoys backend engineering and wants to step into more platform-level API work. You will likely bring:
- Strong experience building backend services in C# .NET
- Solid SQL and experience with relational databases
- Experience designing RESTful APIs and understanding HTTP fundamentals
- Familiarity with authentication approaches like OAuth or JWT
- Exposure to Azure and cloud deployment
- A testing mindset and care for clean, maintainable code
Nice to have, not essential:
- API gateways or API management platforms
- Event-driven or message-based systems
- Building APIs for external partners or developers
- Supporting AI services via APIs
This is a strong move for someone who wants to grow beyond simple CRUD services and into more platform and integration-led backend engineering.
What's next?
We are managing this hire directly and working closely with the engineering leadership behind it. That means real insight, proper preparation and no CV disappearing into a black hole. If you want to work on APIs that actually matter to real products and real users, apply and we will take you through the details.
Software Engineer in Cambridge employer: MRJ Recruitment
Contact Detail:
MRJ Recruitment Recruiting Team
StudySmarter Expert Advice 🤫
We think this is how you could land Software Engineer in Cambridge
✨Tip Number 1
Network like a pro! Reach out to current employees on LinkedIn or attend industry meetups. We can help you connect with the right people who might just put in a good word for you.
✨Tip Number 2
Prepare for those interviews by practising common technical questions and coding challenges. We’ve got resources that can help you brush up on your skills, so don’t hesitate to use them!
✨Tip Number 3
Showcase your projects! Whether it’s GitHub repos or personal projects, having something tangible to discuss can really set you apart. We love seeing what you can do beyond just your CV.
✨Tip Number 4
Apply through our website! It’s the best way to ensure your application gets seen by the right people. Plus, we’re here to guide you through the process every step of the way.
We think you need these skills to ace Software Engineer in Cambridge
Some tips for your application 🫡
Tailor Your CV: Make sure your CV reflects the skills and experiences that match the job description. Highlight your backend engineering experience, especially with C# .NET and API design, to show us you’re the right fit for this role.
Craft a Compelling Cover Letter: Use your cover letter to tell us why you're passionate about building APIs that power real products. Share specific examples of your work with RESTful APIs and any experience with Azure or security patterns like OAuth.
Showcase Your Projects: If you've worked on relevant projects, whether personal or professional, make sure to mention them. We love seeing how you've tackled challenges in backend engineering and API development, so don’t hold back!
Apply Through Our Website: We encourage you to apply directly through our website. This way, we can ensure your application gets the attention it deserves, and you won’t have to worry about it getting lost in the shuffle!
How to prepare for a job interview at MRJ Recruitment
✨Know Your Tech Stack
Make sure you’re well-versed in C# .NET, SQL, and Azure. Brush up on your knowledge of RESTful APIs and authentication methods like OAuth and JWT. Being able to discuss these technologies confidently will show that you’re ready to take ownership of the role.
✨Showcase Your Problem-Solving Skills
Prepare to discuss specific challenges you've faced in backend engineering and how you overcame them. Think about examples where you improved API reliability or implemented strong error handling. This will demonstrate your practical experience and testing mindset.
✨Understand the Company’s Products
Research the SaaS business and their AI-driven products. Familiarise yourself with how their APIs integrate with core services and third-party applications. Showing genuine interest in their work will help you stand out as a candidate who is not just looking for any job, but this job.
✨Prepare Questions for Them
Have a few thoughtful questions ready about their API infrastructure, team dynamics, or future projects. This shows that you’re engaged and thinking critically about how you can contribute to their goals. Plus, it gives you a chance to assess if the company is the right fit for you.
