Senior Software Engineer - AI Products, Warsaw at Hyperexponential

ABOUT HYPEREXPONENTIAL (HX) 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 Until now, insurance has been making billion-dollar decisions using outdated tools.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 HXAI TEAM At hx, AI is not an add-on, it is central to our mission. We are redefining how the insurance industry builds software and makes decisions, powered by generative AI. Our team combines state-of-the-art LLM technology with deep insurance domain expertise to solve problems no one else is tackling. We’re currently focused on two flagship products. The first is a powerful ingestion engine that transforms unstructured insurance documents into structured insights. The second is our crown jewel: a domain-specific AI peer-programmer embedded inside a custom IDE, designed to reshape how actuaries and underwriters code, model risk, and make billion-dollar decisions. This is applied AI with teeth. Our team moves fast, experiments often, and ships real value into the hands of customers. You’ll join a small, high-ownership group with the autonomy to drive innovation and directly influence how AI transforms an entire industry. WHAT YOU’LL BE DOING - Architect and scale advanced AI and ML systems that power hx’s next generation of products - solving problems where no off-the-shelf solution exists. - Lead the design and deployment of cutting-edge model capabilities, from LLM-driven workflows to domain-specific ML pipelines optimised for messy, high-value real-world data. - Drive foundational decisions across data, modelling, and production infrastructure to ensure performance, robustness, and long-term scalability of our AI platform. - Rapidly prototype novel ideas, validate them in live environments, and evolve successful experiments into production-grade systems used by customers at scale. - Advance hx’s broader AI strategy: shaping technical direction, embedding best practices, and raising the bar for how we build, test, and ship ML-powered features. - Act as a technical multiplier: mentoring engineers, cultivating deep ML craftsmanship, and fostering a culture anchored in curiosity, speed, and scientific rigor. WHAT YOU’LL NEED TO HAVE DONE - Built and operated production-grade ML products in Python, with deep expertise across software development, model development, data processing, evaluation, and optimisation. - Designed and scaled distributed, cloud-native pipelines - bringing clarity and structure to ambiguous real-world data challenges. - Taken full ownership of impactful AI initiatives: from identifying the opportunity, to modelling, to deploying and measuring value in production. - Communicated complex ML concepts clearly and persuasively across engineering, product, and business teams. - Influenced technical direction and culture, translating local wins into durable engineering practices. - Delivered AI/ML-powered products end-to-end, balancing rapid experimentation with the demands of high-reliability production systems. - (Nice to have) Brought LLMs into production, especially for NLP-heavy or retrieval-augmented use cases. YOU’RE UNLIKELY TO THRIVE HERE IF - You prefer predefined playbooks and predictable projects over ambiguous, exploratory work. - You see your contribution as limited to code, rather than shaping products and systems end-to-end. - You’re uncomfortable with rapid iteration and experimentation in live environments. If reading our Culture Document [Upgrade to PRO to see link] 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. HOW HX WARSAW WORKS At hyperexponential, we believe in a balance between remote work, and building relationships across teams and locations. You’ll have your main office in Warsaw, 2 days a week, with also ability to travel to London HQ to meet the wider team. International travel will be much less frequent, perhaps 2-3 times a year. Warsaw HQ was established in 2023, quickly hiring our first handful of high-calibre engineers. Fast-forward to today in 2025, there are 50+ in Warsaw and surrounding cities who travel for the collaborative environment. On Wednesdays you’ll often find Warsaw HQ organising team lunch paid by hx, getting drinks after hours. The office is also dog-friendly, so feel free to bring yours along! BENEFITS - B2B - Share Options at a highly successful Series B company - 25 days of non-working + Polish bank holidays - £5,000 GBP budget for Learning & Development - Mental Health Support and Therapy via Spectrum Life - Optional for you: access to Private Healthcare via Luxmed + Multisport (fully funded by yourself as B2B Contractor) - Top-spec laptop (MacOS or Windows) Contract of Employment (UoP) - Share Options at a highly successful Series B company - £5,000 GBP budget for Learning & Development - 26 days of holiday + Polish bank holidays - Company pension - Company Sick Pay for 10 days at 100% salary - Mental Health Support and Therapy via Spectrum Life - Monthly Wellbeing allowance via Juno - Private Healthcare Insurance via Luxmed - Multisport - Classic level - Top-spec work equipment (MacOS, Windows + additional monitors, mechanical keyboards etc) INTERVIEW PROCESS - Initial call with Talent team (30 minutes) - Manager Interview (60 minutes) - Technical Assessment (e.g., code review, system design) (120 minutes) - Values Interview with Tech Leadership (60 minutes) - Offer OUR COMMITMENT TO DIVERSITY hxer's 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.