Frontend/UX Engineer (Senior) at MAIHEM (YC W24)

About Maihem

At Maihem, we’re on a mission to ensure AI benefits all of humanity by making it safe, aligned, and controllable in all real-world applications. As AI systems grow more autonomous, the risks of security vulnerabilities, unintended behaviors, and systemic failures present urgent challenges—yet most organizations lack the tools to test and deploy these systems adequately.

We’re changing that. Our AI-powered simulation platform lets companies stress-test and optimize the performance, security, and safety of their agentic AI systems. A CTO of a $10bn+ enterprise called Maihem “the most advanced AI testing and evaluation system we’ve seen.” That enterprise is now a customer, using our technology to build their agentic workforce responsibly.

Founded by AI researchers with PhDs from Oxford and Imperial College and backed by Y Combinator and a $6M seed round, Maihem is building a future where AI serves all of humanity safely. As our Senior Frontend/UX Engineer, you’ll play a crucial role in shaping this future, ensuring that our tools are intuitive, impactful, and ready to power the most advanced AI systems.

About the Founders

Max Ahrens (CEO) did his PhD and Postdoc in Natural Language Processing at the University of Oxford. During his Postdoc, he won a $500,000 research grant with the Alan Turing Institute and the British Ministry of Defence, working as a research project leader on topics of AI-based narrative detection in online media. Previously, he worked as a consultant with McKinsey, advising globally operating companies on digitization strategies.

Eduardo Candela (CTO) holds a PhD in AI Safety for Autonomous Vehicles at Imperial College London, and an MSc in Operations Research from MIT. Eduardo is deeply passionate about building state-of-the-art AI products – he previously worked as a Technical Program Manager at Tesla and a Data Scientist at the Bosch Center for AI.

Why Work at Maihem?

• We are solving a generational problem by ensuring AI benefits all of humanity.
• Work with leading global companies, helping them to test and deploy some of the most advanced (agentic) AI systems.
• Work with founders who hold PhDs in AI Safety from Oxford and Imperial College London and who have worked on AI at MIT, Tesla, and the Alan Turing Institute. Join our all-star team!
• Work in a YC startup. YC is the best startup accelerator in the world and we are part of its incredible network.
• We have the resources to achieve our mission. We have raised a $6 million seed round backed by Y Combinator, Moonfire, Firstminute, SciFi, Urban Innovation Fund, and other world-class investors including founders from PayPal, Slack, and Deel.

Why be Maihem’s Frontend/UX Engineer?

• Turbo-charge your career in a startup: solve new problems and learn new things every day in an energetic, hard working, and fun startup environment. You will have to wear multiple hats from day 1.
• Lasting impact: you will directly shape the product and company culture from the start, and influence the roadmap and success of the startup.
• Ownership and autonomy: You will own and build end-to-end solutions to various challenging technical problems.

“The ideal startup engineer is relentlessly resourceful, owns a problem and solves it end-to-end, craves ownership and has experience – and they have fun learning new things every day.”

Our Culture

• Nerdy, collegial, relentlessly curious – we are proud and friendly nerds and we intensely love what we do!
• Meritocracy, always – you own and earn your destiny. The best argument wins, not the loudest voice or the most senior team member.
• Work hard, play hard – we work very hard to tackle a generational problem and expect the same from our team. We also have lots of fun as a team inside and outside of the office.
• Diversity and inclusion among humans – for diversity and fairness reflected in AI.

Your Role at Maihem

As Maihem’s Senior Frontend/UX Engineer, you will directly design and build the products around the most advanced AI simulation and stress-testing platform in the world. In particular, you will own the design and development of the Maihem webapp and website, including significant autonomy and responsibility in this senior role.

You will have previously demonstrated the ability to build world-class software products.

Your qualifications

• 3+ years of experience developing web applications
• 1+ years of experience in UX design for products and websites
• Excellent communication skills and team player mentality

Required skills

• Javascript
• React/ Next.js
• Tailwind
• Figma

Nice to have

• Worked at a fast-paced startup before
• Experience with shadcn/ui components
• Experience with basic Python
• Experience with basic AI and LLMs
• Webflow or similar tools for building websites
• Experience with SQL

Benefits

Competitive compensation: GBP 70-100K + performance bonus + equity

+ we take care of you:

• Private health insurance
• Pension contributions
• Free lunch
• Free gym
• Curiosity allowance for books, courses, museum memberships, library cards, ...

Note to recruiters: We kindly request that agencies or recruiters do not contact us regarding this role. We are managing this hiring process directly and appreciate your understanding.