At a Glance
- Tasks: Join a high-growth AI startup and build cutting-edge software solutions.
- Company: Dynamic AI-native startup in Central London with an elite engineering team.
- Benefits: Competitive salary, equity, premium gym membership, and direct impact on product.
- Other info: Fast-paced environment with excellent career growth opportunities.
- Why this job: Shape the future of AI technology while working alongside industry leaders.
- Qualifications: 5+ years in software engineering with strong backend or full-stack skills.
The predicted salary is between 80000 - 100000 £ per year.
My client, a high-growth AI-native startup based in Central London, is looking for an exceptional Senior Backend or Full-Stack Engineer to join their core engineering team. This is a rare opportunity to join an engineering-led company at an early but high-traction stage, working directly on business-critical AI and communications infrastructure used in real-world production environments. The company operates as a genuinely AI-native engineering organisation. AI tooling, LLM-powered workflows, and rapid iteration are deeply embedded into how the team builds products day-to-day. The engineering culture is highly execution-focused, fast-moving, and extremely hands-on.
They are specifically looking for engineers operating at roughly Meta E5/E6 level (or equivalent from companies such as Meta, WhatsApp, Shopify, Stripe, Revolut, Deliveroo, etc.) with strong product engineering instincts and deep technical ability. The ideal candidate is a highly capable senior engineer who combines startup velocity with strong systems thinking and enjoys operating in high-ownership environments. You will work directly alongside the CTO (ex-JP Morgan) and Head of Engineering (ex-Meta) on core architecture, product direction, and scaling challenges.
Requirements:
- 5+ years of software engineering experience in high-performance production environments
- Strong backend or full-stack engineering skills
- Experience building scalable distributed systems and production infrastructure
- Strong product engineering mindset with ability to move quickly and own features end-to-end
- Experience with TypeScript / Node.js strongly preferred
- Experience with modern frontend frameworks (React / Next.js) is a plus for full-stack candidates
- Strong understanding of system design, reliability, scalability, and observability
- Experience in startups or fast-paced product environments is highly desirable
- AI-native mindset — comfortable leveraging AI tooling and rapid iteration workflows
- Strong communication skills and ability to operate autonomously
- European language skills required (Spanish strongly preferred)
- Must already have right to work in the UK or Europe — visa sponsorship is not available outside Europe
- Must be willing to work fully onsite from the company’s Central London office
Tech Environment:
- TypeScript, Node.js, React, Next.js
- AI-native workflows and internal LLM tooling
- Distributed systems and real-time infrastructure
- OpenSearch, SingleStore, Trigger.dev, Axiom
- Modern cloud-native infrastructure and observability stack
What they offer:
- Excellent compensation + meaningful equity
- High-ownership environment with direct impact on product and architecture
- Small, elite engineering team
- Direct collaboration with experienced leadership (ex-Meta / ex-JP Morgan)
- Centrally located Marylebone office
- Premium gym membership
- Fast-moving, ambitious startup environment with strong backing
This role is ideal for engineers who want to build quickly, solve difficult technical problems, and help shape the foundations of a high-growth AI company from an early stage. To apply, please send your CV or contact directly.
Senior Backend / Full-Stack Engineer (E5/E6 Level) – AI-Native Startup – Strong Comp + Equity in Slough employer: Mondrian Alpha
Join a high-growth AI-native startup in Central London, where you'll be part of an elite engineering team that thrives on innovation and rapid iteration. With excellent compensation, meaningful equity, and a high-ownership environment, this role offers the unique opportunity to work directly with experienced leaders from Meta and JP Morgan, shaping the future of AI-driven products. Enjoy a vibrant work culture that prioritises collaboration, personal growth, and a centrally located office with premium benefits.
StudySmarter Expert Advice🤫
We think this is how you could land Senior Backend / Full-Stack Engineer (E5/E6 Level) – AI-Native Startup – Strong Comp + Equity in Slough
✨Tip Number 1
Network like a pro! Reach out to your connections in the tech industry, especially those who might know someone at the startup. A personal introduction can make all the difference in getting your foot in the door.
✨Tip Number 2
Show off your skills! If you have a portfolio or GitHub with projects that highlight your backend or full-stack expertise, make sure to share it. This is your chance to demonstrate your product engineering mindset and technical ability.
✨Tip Number 3
Prepare for the interview by understanding their tech stack. Brush up on TypeScript, Node.js, and any relevant frameworks like React or Next.js. Being able to discuss how you've used these technologies in real-world scenarios will impress the hiring team.
✨Tip Number 4
Don’t forget to apply through our website! It’s the best way to ensure your application gets seen by the right people. Plus, we love seeing candidates who take the initiative to engage directly with us.
We think you need these skills to ace Senior Backend / Full-Stack Engineer (E5/E6 Level) – AI-Native Startup – Strong Comp + Equity in Slough
Some tips for your application 🫡
Tailor Your CV:Make sure your CV reflects the skills and experiences that align with the job description. Highlight your backend or full-stack engineering experience, especially in high-performance environments, to catch our eye!
Showcase Your Projects:Include specific projects where you've built scalable systems or worked with TypeScript and Node.js. We love seeing real-world applications of your skills, so don’t hold back on the details!
Communicate Clearly:Strong communication skills are key for us. When writing your application, be clear and concise about your experiences and how they relate to the role. We want to see your thought process and how you approach problem-solving.
Apply Through Our Website:We encourage you to apply directly through our website. It’s the best way to ensure your application gets into the right hands and shows us you’re serious about joining our team!
How to prepare for a job interview at Mondrian Alpha
✨Know Your Tech Stack Inside Out
Make sure you’re well-versed in TypeScript, Node.js, and any modern frontend frameworks like React or Next.js. Brush up on your knowledge of distributed systems and production infrastructure, as these are crucial for the role. Be ready to discuss your past projects and how you’ve applied these technologies.
✨Showcase Your Problem-Solving Skills
Prepare to talk about specific challenges you've faced in high-performance environments. Think of examples where you had to make quick decisions or iterate rapidly. This will demonstrate your ability to thrive in a fast-paced startup culture and your strong product engineering mindset.
✨Emphasise Your AI-Native Mindset
Since this is an AI-native startup, be prepared to discuss how you’ve leveraged AI tooling in your previous work. Share any experiences with LLM-powered workflows or rapid iteration processes. This will show that you understand the company’s core values and can contribute effectively from day one.
✨Communicate Clearly and Confidently
Strong communication skills are essential, especially when working closely with leadership. Practice articulating your thoughts clearly and confidently. Be ready to explain complex technical concepts in a way that’s easy to understand, as this will highlight your ability to operate autonomously and collaborate effectively.
