Full Stack Engineer — AI-Driven SaaS for Outcomes

Willis Towers Watson; United Kingdom; Hybrid; GBP 55,000 - 75,000; Full time

Benefits offered by this job

25 days of annual leave plus an extra?

private healthcare

life insurance

group income protection

regular health assessments

defined contribution pension scheme, –

hybrid working options

employee assistance programme

fully paid volunteer day to make a dif

electric vehicle car scheme

share scheme

cycle-to-work programme

dental cover

optical cover

critical illness protection

Job summary

Willis Towers Watson is seeking a full-stack developer to join its InsurTech unit in the UK. The role focuses on delivering modern SaaS software, partnering with product to shape the backlog and using AI coding assistants to accelerate delivery.

Expect to write tests, review code, and participate in Agile ceremonies while continuously improving engineering practices. The position offers hybrid working options and a comprehensive benefits package.

Qualifications

• Solid full-stack development experience across modern front-end and back-end technologies, with cloud/SaaS exposure.
• Strong grasp of software design, testing and quality fundamentals - you know what good looks like and can articulate why.
• Comfortable working in Agile/scrum teams and collaborating closely with Product.

Responsibilities

• Working with the Product Owner to define, refine and deliver the product backlog.
• Designing and building software solutions that meet functional and non-functional requirements, using AI coding tools to accelerate delivery.
• Writing and maintaining test-related code - unit tests, test frameworks and automated test cases.
• Reviewing and debugging code to identify defects, performance bottlenecks, and technical debt.
• Participating in Agile/scrum activities (planning, stand-ups, retrospectives) and continuously improving team velocity, process and engineering practice.
• Participating in incident response and continuously harden the platform based on production learnings
• Business outcomes - partnering closely with business stakeholders to understand underlying needs, challenge assumptions where appropriate, and measure success through tangible business and user outcomes.
• Design over implementation - spending more time defining system boundaries, integration patterns and architectural intent, using AI-assisted tools to explore solutions and validate design decisions before code is written.
• Specification as a first-class craft - writing clear, testable intent and acceptance criteria that agents and humans can both act on.
• Review and quality judgement - evaluating AI-generated work for correctness, security and design fit, rather than typing every line yourself.
• Orchestration - composing and supervising AI capabilities and agentic workflows inside governed pipelines with clear quality gates.
• Raising the team, not just yourself - turning good individual practice into shared, reusable capability so the whole team gets faster, not just one person.
• Learning and adaptation - staying current with emerging AI capabilities and engineering practices, helping the team identify, adopt and govern new ways of working that improve delivery and outcomes.

Skills

Full-stack development

Front-end & back-end

Cloud / SaaS

Agile / Scrum

Product collaboration

Tools

AI coding assistants

Agentic tools

Job description

Willis Towers Watson is seeking a full-stack developer to join its InsurTech unit in the UK. The role focuses on delivering modern SaaS software, partnering with product to shape the backlog and using AI coding assistants to accelerate delivery.

Expect to write tests, review code, and participate in Agile ceremonies while continuously improving engineering practices. The position offers hybrid working options and a comprehensive benefits package.