Backend Software Engineer C# AI

Client Server Ltd.; Greater London; Hybrid; GBP 85,000 - 100,000; Full time

Benefits offered by this job

Bonus

Pension

Life Assurance

Critical Illness Cover

Employee Assistance Programme

Company Share Scheme

Paternity leave

Wellness benefits

Onsite gym

25 days holiday

Kids Pass

Volunteering days

Job summary

Client Server Ltd. in London is seeking a Backend Software Engineer to lead backend and cloud-native development with a focus on AI integration. You will be shaping architecture, engineering practices, and how AI technologies are embedded into the software lifecycle.

The role emphasizes collaboration across teams, strong C# skills, and familiarity with cloud platforms, microservices, and modern CI/CD pipelines. Hybrid work model with three days in the London office and two days remote.

Qualifications

• Strong backend C# skills; Python experience helpful.
• Solid CS fundamentals: OOP, multithreading, design patterns.
• Knowledge of cloud-native architectures (Azure/AWS), microservices, CI/CD.
• Familiarity with frontend connectivity (React/Angular preferred).
• Interest in embedding AI into processes and products; using tools like Claude.

Responsibilities

• Develop backend and cloud-native systems in a fast-paced environment.
• Explore AI integration to improve engineering productivity and product capabilities.
• Collaborate on architecture and engineering practices, shaping design patterns and best practices.

Skills

C#

Python

Cloud architecture

React/Angular

CI/CD

Kubernetes

Docker

Design patterns

Multithreading

OOP

Tools

Terraform

Azure

AWS

Event-driven systems

Microservices

Job description

London, Greater London | £85k - £100k per year

Backend Software Engineer / Developer (C# AI) London / WFH to £100k

Are you a Backend Software Engineer with strong C# coding skills combined with a deep knowledge of software engineering best practices and system design?

You could be joining a global reinsurance group, building the technology platform behind a diverse portfolio of insurance products used across its international businesses.

The technology team is small, agile and heavily focused on greenfield development, giving you the opportunity to have real influence over architecture, engineering practices and how AI is embedded into the software development lifecycle.

As a Backend Software Engineer, you'll be an individual contributor working primarily on backend and cloud-native development. A major part of the role will be exploring how AI can improve both engineering productivity and the products themselves - using tools such as Claude alongside strong software design principles, patterns and engineering best practice.

Location / WFH:

You’ll join colleagues in plush City offices with onsite gym and barista, three days a week, with flexibility to work from home the other two days.

About you:

• You have strong backend software engineering skills, with C#, it would also be of benefit to have Python development experience
• You have a strong knowledge of Computer Science fundamentals such as OOP, multithreading, Design Patterns and are comfortable with system design
• You understand what makes a good frontend and how to ensure connectivity between front and backend systems, React or Angular skills preferred
• You have a good understanding of cloud native architectures (Azure / AWS), event driven systems, microservices, CI/CD, Terraform, Kubernetes, Docker
• You're keen to use and adopt more AI into processes and the product, you understand "milestone development" and what good system design looks like, how to get the optimum results from AI with proper use of design patterns and best practices - they use Claude but open to experience with other tools
• You're collaborative with great communication and problem solving skills, ideally with experience in a start-up / small team environment

What's in it for you:

As a Backend Software Engineer you will receive a competitive package:

• Salary to £100k
• Bonus
• Pension, Income Protection, Life Assurance, Critical Illness Cover, Employee Assistance Programme
• Company Share Scheme
• Enhanced paternity leave and benefits
• Wellness benefits such as free PT sessions at the onsite gym, massages
• Medical and Dental Health insurance
• 25 days holiday
• Perks such as "Kids Pass" for discounted days out, smart tech scheme
• Volunteering and charity days