Senior Software Engineer (C# / SQL Server) in London

Senior Software Engineer (C# / SQL Server) in London

London Full-Time 60000 - 80000 £ / year (est.) No working from home possible
Omnis Partners

At a Glance

  • Tasks: Build innovative AI evaluation tools and streamline data workflows in a dynamic startup.
  • Company: Exciting early-stage AI startup with a focus on cutting-edge technology.
  • Benefits: Hybrid work model, competitive salary, and opportunities for rapid career growth.
  • Other info: Fast-paced environment with high ownership and minimal bureaucracy.
  • Why this job: Join a small team and make a real impact on the future of AI technology.
  • Qualifications: Strong full-stack engineering skills and experience in AI product development.

The predicted salary is between 60000 - 80000 £ per year.

Member of Technical Staff - Software Engineering

We’re working with an early-stage AI startup building core infrastructure focused on AI evaluation, structured data workflows, and production-grade operational tooling for frontier AI systems.

The company is building the systems around model performance, combining human-in-the-loop workflows, evaluation tooling, quality control systems, and AI-assisted operations into a scalable platform used within high-stakes environments.

This is a genuine early-stage start-up environment: small team, high ownership, fast execution, minimal bureaucracy, and direct involvement in shaping both product and engineering direction.

This is a highly product-focused engineering role for a strong full-stack engineer who enjoys building complete products end-to-end.

You’ll help design and build the internal platform powering the company’s AI evaluation and data operations engine, including workflows, tooling, interfaces, review systems, and automation pipelines.

The ideal person will care just as much about product usability, workflows, and frontend experience as they do about backend systems and architecture.

You’ll work closely with founders and users to turn complex manual processes into scalable software products, rapidly iterating based on feedback in a fast-moving startup environment.

  • Build full-stack internal products for Agentic AI evaluation and structured data workflows
  • Own features end-to-end across frontend, backend, and infrastructure
  • Help shape engineering standards, architecture, and product direction as the company scales

Strong full stack SWE engineering capability across frontend and backend.

Experience building and shipping agentic AI products within early-stage startup environments.

Product-minded individuals who care about user experience and workflow design.

Engineers who actively use AI tooling within their development workflows.

Senior Software Engineer (C# / SQL Server) in London employer: Omnis Partners

As a Senior Software Engineer at our innovative AI startup in London, you'll thrive in a dynamic and collaborative environment that champions creativity and ownership. We offer a unique opportunity to work closely with industry leaders, shaping cutting-edge AI infrastructure while enjoying a hybrid work model that promotes work-life balance. With a strong focus on employee growth and minimal bureaucracy, you'll have the chance to rapidly develop your skills and make a significant impact on our product and engineering direction.

Omnis Partners

Contact Details:

Omnis Partners Recruitment Team

StudySmarter Expert Advice🤫

We think this is how you could land Senior Software Engineer (C# / SQL Server) in London

Tip Number 1

Network like a pro! Reach out to folks in the AI and software engineering space, especially those connected to startups. Attend meetups or webinars, and don’t be shy about sliding into DMs on LinkedIn – you never know who might have the inside scoop on job openings.

Tip Number 2

Show off your skills! Create a portfolio showcasing your projects, especially those related to AI and full-stack development. Make sure to highlight any experience with C# and SQL Server, as well as any cool tools or workflows you've built. This will give potential employers a taste of what you can bring to their team.

Tip Number 3

Prepare for interviews by brushing up on both technical and product-focused questions. Be ready to discuss how you’ve tackled complex problems in past roles and how you approach user experience and workflow design. Remember, they want to see your passion for building scalable products!

Tip Number 4

Apply through our website! We’re all about connecting talented individuals with exciting opportunities. By applying directly, you’ll ensure your application gets the attention it deserves, and you might even get a chance to chat with us about how you can shape the future of AI evaluation.

We think you need these skills to ace Senior Software Engineer (C# / SQL Server) in London

C#
SQL Server
Full-Stack Development
AI Product Development
Frontend Development
Backend Development
User Experience Design

Some tips for your application 🫡

Show Your Passion for AI:When writing your application, let us see your enthusiasm for AI and how it drives your work. Share any relevant projects or experiences that highlight your interest in building AI products, especially in a startup environment.

Highlight Full-Stack Experience:Make sure to showcase your full-stack engineering skills. We want to know about your experience with both frontend and backend technologies, so don’t hold back on detailing the projects where you’ve owned features end-to-end.

Focus on Product Usability:Since this role is highly product-focused, emphasise your understanding of user experience and workflow design. Talk about how you've improved usability in past projects and how you approach building scalable software products.

Apply Through Our Website:We encourage you to apply directly through our website. It’s the best way for us to receive your application and ensures you’re considered for this exciting opportunity to shape the future of AI evaluation and data workflows.

How to prepare for a job interview at Omnis Partners

Know Your Tech Stack

Make sure you’re well-versed in C# and SQL Server, as these are crucial for the role. Brush up on your full-stack capabilities and be ready to discuss how you've used these technologies in past projects, especially in building end-to-end products.

Showcase Your Product Mindset

This role is all about product usability and user experience. Prepare examples of how you've improved workflows or user interfaces in previous roles. Be ready to discuss how you balance technical requirements with user needs.

Embrace the Startup Culture

Familiarise yourself with the dynamics of early-stage startups. Highlight your experience in fast-paced environments and your ability to take ownership of projects. Share stories that demonstrate your adaptability and willingness to iterate based on feedback.

Engage with Founders and Users

Since you'll be working closely with founders and users, prepare questions that show your interest in their vision and challenges. This not only demonstrates your enthusiasm but also helps you understand how you can contribute to shaping the product and engineering direction.