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 early-stage startups.
The predicted salary is between 60000 - 80000 £ per year.
Member of Technical Staff - Software Engineering
Seed Stage Agentic Infras Start-up
Work directly with some of the world's largest AI Frontier Labs
London | Hybrid
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# / JavaScript) 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.
StudySmarter Expert Advice🤫
We think this is how you could land Senior Software Engineer (C# / JavaScript) in London
✨Tip Number 1
Network like a pro! Reach out to people in the industry, especially those working at startups or in AI. Use platforms like LinkedIn to connect and engage with them. A personal introduction can make all the difference!
✨Tip Number 2
Show off your skills! Create a portfolio showcasing your projects, especially those related to AI and full-stack development. This is your chance to demonstrate your product-minded approach and how you tackle user experience.
✨Tip Number 3
Prepare for technical interviews by brushing up on your C# and JavaScript skills. Practice coding challenges and be ready to discuss your past experiences in building scalable software products. Confidence is key!
✨Tip Number 4
Don’t forget to apply through our website! We’re always on the lookout for passionate engineers who want to shape the future of AI. Your next big opportunity could be just a click away!
We think you need these skills to ace Senior Software Engineer (C# / JavaScript) in London
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.
Tailor Your CV and Cover Letter:Make sure to customise your CV and cover letter to reflect the specific skills and experiences mentioned in the job description. We want to see how your full-stack capabilities align with our needs, so don’t hold back on showcasing your best work!
Highlight Your Product Mindset:We’re looking for engineers who care about user experience and workflow design. In your application, emphasise any experiences where you’ve contributed to product usability or worked closely with users to improve software solutions.
Apply Through Our Website:To make sure your application gets the attention it deserves, apply directly through our website. It’s the best way for us to keep track of your application and ensure it reaches the right people quickly!
How to prepare for a job interview at Omnis Partners
✨Know Your Tech Stack
Make sure you’re well-versed in C# and JavaScript, as these are key 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 designed workflows or interfaces that improved user interaction. Be ready to discuss how you balance backend architecture with frontend experience.
✨Embrace the Startup Spirit
Since this is an early-stage startup, they’ll want to see your adaptability and ownership. Share experiences where you’ve thrived in fast-paced environments, tackled challenges head-on, and contributed to shaping product direction.
✨Prepare for Technical Challenges
Expect technical questions or coding challenges during the interview. Practice common algorithms and data structures, and be prepared to solve problems on the spot. They’ll be looking for your thought process as much as the final answer.
