Senior AI Platform Engineer

At hyperexponential, we're building the AI-powered platform that enables the world's most critical decisions in a $7 trillion industry, which risks to take, and how to price them. These are the decisions that shape real-world outcomes: whether rockets successfully launch into space, autonomous vehicles make it to market, or communities recover after major storms. Until now, insurance has been making billion-dollar decisions using outdated tools. We're changing that. Our platform brings together data, AI, and human expertise to give insurers the fastest path from submission to decision - helping them move faster, act smarter, and take on more risk with confidence. Backed by a16z, Highland Europe, and Battery Ventures, we're scaling globally - already trusted by nearly 50 of the world's largest insurers, with zero churn and billions in premiums flowing through hx. What began as a single product in one market has rapidly evolved into a multi-product, multi-territory platform powering every stage of pricing and underwriting. AI is at the core of what we do - from building the world's first domain-specific AI peer programmer for insurance (think GitHub Copilot with a PhD in actuarial science) to shaping agentic workflows that reinvent how this industry operates. What makes hx different is the people who build it. Here, impact isn't tied to title or tenure; it's defined by the challenges you take on and the discipline you bring. Surrounded by peers who stretch you, you'll do the best, hardest work of your life in a company engineered to endure. If that sounds like you, join us in building what comes next. About the AI Platform team At hx, AI agents generative AI are becoming embedded across every team and product. The AI Platform team exists to make that happen safely and at scale. We own the shared building blocks that enable any technology team at hx to build, ship, and operate AI agents quickly, safely, and consistently. We build the platform, not the agents. The reusable foundations that agent-building teams depend on: observability for end-to-end tracing, cost tracking, and visibility across all AI usage; gateways for unified LLM access and centralised tool routing; governance for agent identity, authorisation, cost controls, and audit logging; and developer experience through SDKs, documentation, and patterns that make spinning up a production-grade agent fast and consistent. We are a small, high-ownership team that moves fast and builds for adoption. We measure success not by what we ship, but by what other teams can build because of what we ship. What you'll be doing Observability & Evaluation: Building and evolving the platform that gives hx end-to-end visibility into AI agent behaviour and quality. Tracing, cost tracking, usage dashboards, and shared evaluation infrastructure that helps teams measure and improve agent performance. Composition : Designing and operating the infrastructure that connects agents to LLMs and tools. Unified proxies, centralised tool routing, discovery, and access governance so agent-building teams don't have to solve these problems individually. Governance : Defining and implementing the identity, authorisation, and policy layer for AI agents. Scoped credentials, per-tool permissions, audit logging, cost controls, and trust boundary patterns that let agents operate safely as they scale. Developer experience : Shaping the tools, SDKs, documentation, and patterns that make it fast for any team to go from zero to a production-grade agent on the platform. Adoption : Driving adoption of shared platform services across technology teams, replacing bespoke per-agent integrations with consistent, well-documented capabilities. Measuring impact and iterating based on what teams actually need. What you'll need to have done Built and operated platform infrastructure used by multiple teams : API gateways, proxies, observability systems, CI/CD pipelines, cloud infrastructure, or developer platforms where adoption and reliability were your responsibility. Delivered developer-facing tools, SDKs, or APIs that other engineers relied on daily, with a strong focus on usability, documentation, and developer experience. Worked with modern AI infrastructure : LLM integrations, agent frameworks, or AI-related tooling. You don't need to be an ML researcher, but you should have hands-on experience building with AI -- whether in production, meaningful side projects, or open source -- and be comfortable navigating the AI tooling landscape. Operated systems with governance, security, or compliance requirements : identity models, access control, audit logging, or similar concerns where getting it wrong has real consequences. Successfully driven adoption of shared services across engineering teams, replacing fragmented, team-specific solutions with consistent platform capabilities, and measuring the impact. Taken full ownership of initiatives end-to-end : from scoping and planning through to building, driving adoption, and validating success with data. Not just shipping code, but ensuring it lands. We're hiring at both mid (IC2) and senior (IC3) levels. If you've done some but not all of the above, we'd still like to hear from you. You're unlikely to thrive here if You wait for detailed specifications before acting. This team operates in a fast-moving, ambiguous space. We scope problems, make decisions, and iterate. If you need everything defined upfront, you'll find it frustrating. You prefer to work in a silo. We are a platform team. Our work only succeeds when other teams adopt it. That means constant collaboration, stakeholder engagement, and genuine interest in making other engineers more productive. You see shipping code as the finish line. Here, delivery means adoption. You'll be expected to own the full lifecycle: build it, document it, drive adoption, measure impact, and iterate. You're not energised by ownership and visibility. Every member of this team leads initiatives, communicates progress transparently, and represents their work to stakeholders. If you prefer to stay heads-down and let others handle the context-setting, this isn't the right fit. If reading our Culture Document leaves you feeling neutral rather than energised, hx may not be the place where you'll do your best work. We're building something that asks for commitment and conviction, and we want you to feel excited by the opportunity to grow with us. Compensation At hx, we're committed to salary transparency. You'll always have clarity on pay early in the process - our Talent Partner will share details with you during initial conversations - and we're working towards publishing salary information for all roles globally. Because we're building at the intersection of technology/SaaS and insurance, our roles don't always map neatly onto traditional benchmarks. Our approach is to design compensation that's competitive in the market, fair across teams, and aligned with the impact our people make. Equity: We offer equity across all roles at hx, making it a significant component of total compensation. Your Talent Partner will be able to share more details about this. Benefits £5,000 training and conference budget for individual and group development. 25 days of holiday plus 8 bank holidays (33 days total). Company pension scheme via Penfold. Mental health support and therapy via Spectrum.life. Individual wellbeing allowance via Juno. Private healthcare insurance through AXA. Income protection and Life Insurance. Cycle to Work Scheme. Additional perks Top-spec equipment (laptop, screens, adjustable desks, etc.). Regular remote and in-person hackathons, lunch and learns, socials, and game nights. Team breakfasts and lunches, snacks, drinks fridge, and a fun office at The Ministry. Exceptional opportunities for personal development and growth as we build something remarkable together. Interview process 1. Initial chat with our Talent team (30 minutes). 2. Manager Interview (1 hour). 3. Technical Assessment broken into two parts (1 hour each) 4. Values Interview with Senior Tech Leadership (1 hour). 5. We offer! Our commitment to Diversity hxers are at the centre of everything we build. We know that progress depends on diverse perspectives, and we are committed to creating an environment where everyone can thrive, grow, and make an impact. We recognise there is always more to do, and we take responsibility for shaping a workplace that is not only diverse but genuinely inclusive. Diversity is not just the right thing to do, it is key to solving the complex challenges we choose to take on. By welcoming people from all backgrounds and experiences, we strengthen our ability to question assumptions, push boundaries, and design solutions that endure. If you're energised by complexity and motivated to grow, we encourage you to apply and join our global team. Next steps If this opportunity resonates with you, we encourage you to apply or share it with your connections! Our dedicated talent team reviews all applications, and we promise to provide feedback regardless of the outcome. For more information about applying and to view other opportunities, you can visit our careers page. Please note that background checks will be conducted as part of the hiring process to ensure compliance with our governance policies. We handle all background checks sensitively and in full compliance with relevant regulations. All applicant data will be processed in accordance with data protection regulations and our privacy policy.