Backend Software Engineer C# AI

Client Server; Greater London; Hybrid; GBP 60,000 - 100,000; Full time

Benefits offered by this job

Bonus

Pension and life cover

Company share scheme

Enhanced paternity leave

Wellness benefits

Health and dental insurance

25 days holiday

Kids Pass

Smart tech scheme

Volunteer days

Job summary

Client Server in London is seeking a Backend Software Engineer to join their AI-focused, cloud-native team. You will contribute primarily to backend systems, APIs, and design patterns while exploring how AI can streamline development and product capabilities.

The role offers a hybrid work arrangement with three days in the City offices and two remote days, along with a comprehensive benefits package and a salary up to £100k.

Qualifications

• Strong backend software engineering skills with C#, Python is a plus.
• Solid CS fundamentals: OOP, multithreading, design patterns, and system design.
• Understanding frontend-backend connectivity; React or Angular skills preferred.
• Experience with cloud-native architectures (Azure/AWS), event-driven systems, microservices, CI/CD, Terraform, Kubernetes, Docker.
• Interest in applying AI (Claude) to processes and products with good design patterns.
• Collaborative and communicative, ideally in startup/small-team environments.

Responsibilities

• Develop backend and cloud-native software across services and APIs.
• Explore how AI can improve engineering productivity and product features.
• Collaborate with cross-functional teams to influence architecture and best practices.

Skills

C#

Python

OOP

Multithreading

Design Patterns

System design

React

Angular

Azure

AWS

Event-driven

Microservices

CI/CD

Terraform

Kubernetes

Docker

AI integration

Claude

Startup experience

Job description

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