Full Stack Engineer C#.Net Agentic AI

Client Server; Reigate; Hybrid; GBP 40,000 - 70,000; Full time

Benefits offered by this job

Bonus

Enhanced parental leave

25 days holiday + birthday off

Pension

Health care

Life assurance

Training and career development

Social events

Job summary

Client Server in Reigate is seeking a senior full-stack developer with strong C#/.NET and modern JavaScript/TypeScript experience to design, build, and maintain cloud-based SaaS applications.

You will work with AI coding tools and shape features from concept to production in a fast-paced, Agile environment.

Qualifications

• Strong full stack development experience with C# .Net and modern front end technologies such as JavaScript or TypeScript.
• Experience building cloud-based SaaS applications.
• Hands-on experience using AI coding assistants and agentic development tools.
• Ability to write effective specifications and prompts and confidently review AI-generated code for quality, security, and maintainability.
• Genuine interest in applying AI to accelerate software delivery while maintaining high engineering standards.
• Strong understanding of software engineering best practices, including architecture, testing, code quality, and Agile delivery.

Responsibilities

• Design, develop, and enhance modern SaaS applications.
• Work closely with Product Owners to shape new features from concept through to production.
• Build scalable, high-quality software.
• Write automated tests.
• Review code and contribute throughout the Agile development lifecycle.
• Use AI to accelerate delivery while taking ownership of architecture, quality, security, and technical decision making.
• Define technical solutions and write clear specifications.
• Review AI-generated code.
• Orchestrate AI workflows.
• Help establish engineering best practices across the team.

Skills

C#/.NET

JavaScript

TypeScript

Fullstack

AI tools usage

Code review & QA

Agile delivery

Analytical problem solving

Tools

ASP.NET

Agentic AI

Job description

Salary: £40,000 - 70,000 per year

Requirements:

• Strong full stack development experience with C# .Net and modern front end technologies such as JavaScript or TypeScript
• Experience building cloud-based SaaS applications
• Hands‑on experience using AI coding assistants and agentic development tools
• Ability to write effective specifications and prompts and confidently review AI‑generated code for quality, security, and maintainability
• Genuine interest in applying AI to accelerate software delivery while maintaining high engineering standards
• Strong understanding of software engineering best practices, including architecture, testing, code quality, and Agile delivery
• Analytical problem solver who thrives in fast‑paced, evolving environments
• Enjoys continuously improving products, processes, and engineering practices

Responsibilities:

• Design, develop, and enhance modern SaaS applications
• Work closely with Product Owners to shape new features from concept through to production
• Build scalable, high‑quality software
• Write automated tests
• Review code and contribute throughout the Agile development lifecycle
• Use AI to accelerate delivery while taking ownership of architecture, quality, security, and technical decision making
• Define technical solutions and write clear specifications
• Review AI‑generated code
• Orchestrate AI workflows
• Help establish engineering best practices across the team

Technologies:

• AI
• C#
• Cloud
• JavaScript
• Security
• TypeScript
• ASP.NET
• Agentic AI
• Fullstack

More:

We are a global InsurTech business producing game‑changing technology. We offer a senior, hands‑on role with a flexible hybrid working model: three days working from home and two days a week in our Reigate office for team meet‑ups and stakeholder meetings. Our package includes up to 95k salary plus bonus, enhanced parental leave, 25 days holiday plus buy days and your birthday off, pension, health care, life assurance, training and career development, social events, and a range of other perks. We are embracing AI‑native software engineering and evolving toward an agentic development environment that values ownership, quality, security, and technical excellence.

last updated 36 week of 2026