Lead Software Developer

Arch Capital Group; Greater London; On-site; GBP 68,000 - 108,000; Full time

Job summary

Arch Capital Group is seeking a senior software engineer based in London or Birmingham to lead C#-driven development initiatives. The role emphasizes modern best practices in coding, testing, and system maintenance, with a strong focus on scalable architecture and collaboration across teams.

The candidate should be proficient in C#, TDD/BDD/DDD, and both SQL and NoSQL databases, while having hands-on experience with GitHub, cloud platforms (Azure/AWS), and evolving AI technologies such as

Qualifications

• Comprehensive understanding of C#.
• Experience with TDD, BDD, and DDD.
• Ability to discuss architectural patterns and trade-offs.
• Experience with SQL and NoSQL DBMS.
• Experience with a modern source control system, such as GitHub.
• Experience with a cloud platform, such as Azure or AWS.
• Event Sourcing experience is desirable.
• Experience with an AI platform, such as OpenAI, is desirable.

Responsibilities

• Provide technical guidance and leadership in the design and development of software applications using C#.
• Ensure the application of best practices in coding, testing, and maintenance.
• Stay updated with the latest developments in C# and related technologies.
• Design, code, test, debug, and document complex applications and systems.
• Optimize and refactor existing code to improve performance and maintainability.
• Collaborate with other team members to integrate systems and solutions.

Tools

GitHub

Job description

Salary: £68,000 - 108,000 per year

Requirements:

• Comprehensive understanding of C#
• Experience with TDD, BDD, and DDD
• Ability to confidently discuss architectural patterns and their trade-offs
• Experience with SQL and NoSQL DBMS
• Experience with a modern source control system, such as GitHub
• Experience with a cloud platform, such as Azure or AWS
• Event Sourcing experience is desirable
• Experience with an AI platform, such as OpenAI, is desirable

Responsibilities:

• Provide technical guidance and leadership in the design and development of software applications using C#
• Ensure the application of best practices in coding, testing, and maintenance
• Stay updated with the latest developments in C# and related technologies
• Design, code, test, debug, and document complex applications and systems
• Optimize and refactor existing code to improve performance and maintainability
• Collaborate with other team members to integrate systems and solutions

Technologies:

• AI
• AWS
• Azure
• C#
• Cloud
• DDD
• GitHub
• NoSQL
• SQL
• TDD
• DevOps

More:

We are a company rooted in collaboration, expertise, and innovation, and we aim to promote progress and inspire our clients, employees, investors, and communities to achieve their greatest potential. Our work is the catalyst that helps others achieve their goals, and in short, we Enable Possibility. We are looking for someone who enjoys solving complex business problems, working with talented colleagues, and bringing an innovative mindset. This is a full-time role based in London or Birmingham, United Kingdom.

last updated 36 week of 2026