Senior Software Engineer C# Python AI

Client Server Ltd.; Greater London; On-site; GBP 80,000 - 100,000; Full time

Benefits offered by this job

Bonus

Pension

Life Assurance

Critical Illness Cover

Employee Assistance Programme

Company Share Scheme

Enhanced paternity leave

Wellness benefits

Medical and Dental Health insurance

25 days holiday

Kids Pass

Smart tech scheme

Volunteering and charity days

Job summary

Client Server Ltd. in London is seeking a Senior Software Engineer to work on backend and cloud-native development, with C# and/or Python and a strong focus on AI integration. You will influence architecture, engineering practices and how AI is embedded into the software development lifecycle.

The role is based in London with hybrid WFH flexibility; you will join a small, agile team developing greenfield projects in a fast-paced environment.

Qualifications

• Strong backend skills with C# and/or Python.
• Solid knowledge of CS fundamentals, OOP, multithreading and design patterns.
• Cloud-native architectures and microservices experience; CI/CD mindset and IaC tooling.

Responsibilities

• Develop and maintain backend services and cloud-native components.
• Influence architecture, engineering practices and how AI is embedded into products.
• Collaborate across teams to ensure robust connections between frontend and backend systems.

Skills

C# and/or Python

Backend development

Cloud-native / Azure AWS

CI/CD / Terraform / Kubernetes /Docker

React or Angular

AI integration interest

Tools

Terraform

Kubernetes

Docker

Azure

AWS

Job description

London, Greater London | £80k - £100k per year

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

Are you a Senior Software Engineer with C# and / or Python coding skills combined with a strong 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 Senior 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# and / or Python (or both!)
• 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 Senior 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