At a Glance
- Tasks: Join a high-growth AI-native startup and build impactful software solutions.
- Company: Exciting AI-native startup in Central London with a fast-paced, hands-on culture.
- Benefits: Competitive salary, meaningful equity, premium gym membership, and direct impact on product.
- Other info: Work fully onsite in a dynamic environment with excellent career growth opportunities.
- Why this job: Shape the future of AI technology while collaborating with industry leaders.
- Qualifications: 5 years of software engineering experience and strong backend/full-stack skills required.
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 and 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 gala.santaballa@mondrian-alpha.com directly.
Locations
Senior Backend / Full-Stack Engineer (E5/E6 Level) – AI-Native Startup – Strong Comp Equity in City of London, London 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 a strong focus on ownership and direct impact, this role offers exceptional compensation, meaningful equity, and the chance to collaborate closely with experienced leaders from top tech firms. Enjoy a dynamic work culture that values your contributions while benefiting from a centrally located office and premium gym membership.
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 City of London, London
✨Join Local Tech Meetups
Get out there and mingle with fellow developers by joining local tech meetups. It’s a fantastic way to meet people who might be working at Mondrian Alpha or know someone who does. Plus, you can pick up some trendy tech skills and trends while you're at it!
✨Contribute to Open Source Projects
Show off your coding chops by jumping into open-source projects. Not only does this give you practical experience, but it also gets you noticed in the dev community. You'll create a killer portfolio that speaks volumes about your skills to Mondrian Alpha.
✨Tap into Online Developer Communities
Don’t underestimate the power of online developer communities like GitHub, Stack Overflow, and even Reddit. Participate in discussions, share your projects, and build your visibility. We can often find opportunities through these channels that can lead to a full-time gig at companies like Mondrian Alpha.
✨Explore Job Boards Specifically for Tech Roles
Keep your eyes peeled on job boards that focus on tech roles. Sites like TechCareers or Stack Overflow Jobs can often have listings for companies like Mondrian Alpha that might not show up on broader job sites. Make it a habit to check these regularly, and don’t hesitate to apply directly through our website!
We think you need these skills to ace Senior Backend / Full-Stack Engineer (E5/E6 Level) – AI-Native Startup – Strong Comp Equity in City of London, London
Some tips for your application 🫡
Show off your coding skills:When applying for a software engineering role, it's super important to showcase your coding skills. Make sure your CV includes your tech stack, any relevant programming languages you’re comfortable with, and examples of projects you've worked on. If you have a GitHub profile, link it up! We love to see code in action.
Tailor your portfolio:For a full-time role, we’d expect to see some solid examples of your work in your portfolio. Make sure to include at least two or three projects that highlight your problem-solving skills and your ability to work with different technologies. Focus on the projects that are most relevant to the position at Mondrian Alpha.
Craft a killer cover letter:Your cover letter is your chance to stand out—make it personal! Explain why you want to work at Mondrian Alpha and how your skills align with the role. Show us your passion for software development. We dig enthusiastic candidates who understand the value of collaboration and continuous learning!
Be clear and concise:When it comes to writing your CV and cover letter, clarity is key. Avoid jargon that could confuse us and stick to simple, direct language. Highlight your achievements with quantifiable results where possible, and keep everything easy to read. A well-organised application goes a long way!
How to prepare for a job interview at Mondrian Alpha
✨Brush Up on Your Coding Skills
For a full-time software engineering role, it's crucial that we stay sharp with our coding abilities. Expect technical questions that might involve solving problems on the spot or discussing algorithms. Practise on platforms like LeetCode or HackerRank to get comfortable with the types of questions that often come up.
✨Know Your Tools and Frameworks
Make sure we’re well-acquainted with the tools and technologies listed in the job description. Familiarise ourselves with any specific frameworks or programming languages mentioned. If Mondrian Alpha uses React or Node.js, for instance, be ready to discuss how we’ve used them in previous projects or coursework.
✨Showcase Your Projects
Bring along a portfolio that highlights our best work. This could be code samples, GitHub repositories, or any side projects we’ve built. Make sure we can talk through our thought process for each project, especially the challenges we faced and how we solved them—this shows our problem-solving skills in action.
✨Prepare for Behavioural Questions
While technical skills are key, full-time positions also require cultural fit. Be ready to discuss our previous experiences and how we handle teamwork, conflict, and deadlines. Brush up on the STAR method—Situation, Task, Action, Result—to clearly articulate our past experiences when discussing how we've contributed to a team.
