Hybrid Senior Model Developer

at hyperexponential

• Job title: Senior Model Developer
• Job type: Full Time
• Experience level: Senior
• Salary: Not specified
• Degree requirement: Bachelor's Degree
• Tech skills: Python
• Location requirements: Hybrid, London, United Kingdom

About the role

• Senior Model Developer focused on building and delivering complex models on hx Renew for critical insurance decisions at hyperexponential. Collaborating with cross-functional teams and driving solutions for ambiguous problems.

Responsibilities

• Own end-to-end delivery of complex models on hx Renew, from scoping and technical design through build, testing, iteration, and customer delivery.
• Build and maintain production-grade Python models, setting a high bar for code quality, testing, and modelling best practices.
• Act as a technical authority on customer projects, working directly with actuarial teams and senior stakeholders to solve complex, ambiguous problems.
• Raise quality across the team through code review, pairing, mentoring, and contributions to shared guidance and standards.
• Support the development of other Model Developers, providing feedback and technical leadership in day-to-day delivery.
• Proactively identify opportunities to improve tooling, processes, and ways of working to increase delivery speed, predictability, and quality.

Requirements

• Shipped and maintained production-grade Python code in complex, data-heavy environments.
• Delivered actuarial, pricing, or advanced analytical models in real-world settings (insurance or reinsurance experience is strongly preferred).
• Taken ownership of complex, ambiguous problems, creating structure and driving them through to high-quality outcomes.
• Worked directly with customers or senior non-technical stakeholders, translating requirements into robust technical solutions.
• Acted as a senior contributor within a team, influencing quality, standards, and ways of working beyond your own tasks.
• Operated effectively in a high-trust, high-accountability environment, demonstrating ownership, judgement, and continuous learning.

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