Lead Software Developer

Arch Capital Group Ltd.; City of Westminster; On-site; GBP 75,000 - 115,000; Full time

Job summary

Arch Capital Group seeks a Lead Software Developer to own the design and delivery of complex C# applications. You will lead technical guidance, drive best practices, and collaborate with the team to build scalable solutions across cloud platforms.

Key requirements include deep C# knowledge, TDD/BDD/DDD, experience with SQL/NoSQL, GitHub, and Azure or AWS. Desirable experience with Event Sourcing and OpenAI integrations. The role is full-time on site in London or Birmingham, United Kingdom.

Qualifications

• Proficient in C# and .NET development.
• Experience with TDD/BDD/DDD methodologies.
• Ability to discuss architectural patterns and trade-offs.
• Strong SQL and NoSQL DBMS knowledge.
• Experience with modern source control (GitHub).
• Hands-on with cloud platforms (Azure or AWS).
• Nice-to-have: Event Sourcing.
• Nice-to-have: OpenAI integrations.

Responsibilities

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

Skills

C#

TDD

BDD

DDD

Architectural patterns

SQL

NoSQL

GitHub

Azure

AWS

Event Sourcing

OpenAI

Tools

GitHub

Azure

AWS

OpenAI

Job description

Lead Software Developer

2026-10-09T00:00:00

Location

Ladywood, West Midlands, GB, B16 8

Company

Arch Capital Group

2027-01-08T11:02:06.43

Company Culture

With a company culture rooted in collaboration, expertise and innovation, 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. In short, We Enable Possibility.

Responsibilities

Technical Guidance

• 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.

Software Development

• 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.

Skills and Experience

• Comprehensive understanding of C#
• TDD, BDD, DDD
• Ability to confidently discuss various architectural patterns with a good understanding of trade-offs
• Experience with SQL and NoSQL DBMS
• Modern source control system (for example, GitHub)
• Experience with a cloud platform (Azure/AWS)
• Event Sourcing (desirable)
• Experience with an AI platform (OpenAI), (desirable)

Summary Location

London, United Kingdom; Birmingham, United Kingdom

Job Type

Full time