Full Stack Engineer

Willis Re (UK) Limited; Greater London; On-site; GBP 90,000 - 130,000; Full time

Job summary

Willis Re (UK) Limited is seeking a Full Stack Engineer to build its global technology estate from the ground up, focusing on data, analytics and modern cloud platforms. You will own features end‑to‑end across APIs, services and user interfaces, with AI‑enabled design and secure, scalable architectures.

The role requires hands‑on engineering across the stack, experience with C#/.NET or Python, React/Angular on Azure, and modern DevOps practices, collaborating across a greenfield estate.

Qualifications

• Extensive professional software engineering experience shipping production systems end to end.
• Backend: strong C#/.NET or Python; solid API design and SQL skills.
• Frontend: modern UI with React or Angular and TypeScript.
• Cloud & DevOps: Azure, CI/CD tooling (Azure DevOps or GitHub Actions), and infrastructure‑as‑code (Terraform).
• Security: apply patterns like OAuth 2.0, RBAC, secure coding practices.
• AI Development: experience with AI-enabled features or willingness to learn; data‑heavy features care about performance.

Responsibilities

• Build Across the Stack: design, build and ship features end to end from APIs to UI.
• Cloud Native Delivery: develop cloud‑native apps on Microsoft Azure using PaaS and IaC.
• Data‑Driven Features: surface data through APIs for brokers and analysts.
• AI‑Enabled Development: build AI-enabled features with retrieval augmentation and tool/integration patterns.
• AI‑Assisted Engineering: adopt AI tools in day‑to‑day workflows and mentor others.
• Integration: connect with external market platforms and vendor SaaS via API‑first patterns.
• Quality & Security: practice TDD, write secure code, enforce authentication/authorization.
• Collaboration: align with architectural standards and review code across teams.

Skills

C#/.NET

Python

API design

SQL

React

Angular

TypeScript

Azure

CI/CD

Terraform

Security patterns

Tools

Azure DevOps

GitHub Actions

Terraform

Job description

Full Stack Engineer at Willis Re is building its global technology estate from the ground up, unencumbered by legacy and designed around data, analytics and modern cloud platforms. We are looking for a Full Stack Engineer to build the products that power our reinsurance broking, analytics and client‑facing platforms. This is a hands‑on engineering role for someone who enjoys working across the whole stack and is equally comfortable building conventional services and AI‑enabled features.

Key Responsibilities

• Build Across the Stack: Design, build and ship features end to end, from APIs and services through to responsive, accessible user interfaces.
• Cloud Native Delivery: Develop and run cloud‑native applications on Microsoft Azure, using PaaS services, containers and infrastructure‑as‑code.
• Data‑Driven Features: Consume data through APIs and services to surface it in usable, performant ways for brokers and analysts.
• AI‑Enabled Development: Build AI‑enabled product features using patterns such as retrieval‑augmented generation, tool and API integration, evaluation and human‑in‑the‑loop design.
• AI‑Assisted Engineering: Use AI‑assisted engineering tools such as Claude Code or Claude Cowork as part of your day‑to‑day workflow, and help the wider team adopt them well.
• Integration: Integrate with external market platforms, carrier and client systems, and vendor SaaS products using API‑first and event‑driven patterns.
• Quality & Security: Practise test‑driven development and write secure, maintainable code, applying established security patterns including authentication and authorisation (Entra ID, OAuth 2.0), data protection and privacy from the start.
• Collaboration: Build to the agreed architectural standards and help shape them, contributing to design discussions, reviewing code from in‑house and partner engineers, and mentoring others across a greenfield estate.

About You

You are a pragmatic, hands‑on engineer who enjoys a fast‑moving, greenfield environment and wants to work across both traditional and AI‑native development.

Experience

• Extensive professional software engineering experience, with a track record of shipping and supporting production systems end to end. Experience in insurance, reinsurance or wider financial services is a plus.
• Backend: Strong programming skills in C#/.NET or Python, solid API design and strong SQL.
• Frontend: Practical experience building modern user interfaces with React or Angular and TypeScript.
• Cloud & DevOps: Hands‑on experience with Azure, CI/CD tooling such as Azure DevOps or GitHub Actions, and infrastructure‑as‑code (Terraform).
• Standards & Security: Experience building to architectural standards and applying common patterns such as microservices, event‑driven and API‑led design, together with a strong grounding in security patterns (OAuth 2.0, OIDC, Entra ID, RBAC) and secure coding practices.
• Data: Comfortable working with relational databases and data‑heavy application features, with strong SQL and an eye for query performance.
• AI Development: Experience building with LLMs and AI‑enabled solutions, or a clear appetite to learn. Familiarity with agentic patterns, prompt design and evaluation is a significant advantage.
• Engineering Craft: Fluency in test‑driven development and automated testing, an eye for maintainable design, and good judgement about when to keep things simple.
• Communication: Ability to work closely with product stakeholders and delivery partners, and to explain technical trade‑offs clearly.

Equal Opportunity Statement

We provide equal opportunity to all qualified individuals regardless of race, colour, religion, age, gender, gender expression, national origin, veteran status, disability, orientation, or any other legally protected categories. If you have a need that requires accommodation, please email us at [e-mail].