Senior Software Developer - .NET/C#

Pioneer Search; Greater London; On-site; GBP 90,000 - 120,000; Full time

Job summary

Pioneer Search is seeking a Senior Software Developer to join a high-performing team in the UK. You will design, build and modernise bespoke applications on a Microsoft stack, contributing to critical digital platforms and cloud-based solutions that support rapid international growth.

The role involves collaborating with product owners, architects and engineers to deliver robust, scalable software, while driving testing, automation and deployment improvements.

Qualifications

• Proficient in C#, .NET and ASP.NET development across the full stack.
• Strong experience with SQL Server and relational database design.
• Familiarity with modern front-end frameworks like Angular and ORM tools.

Responsibilities

• Design, develop and enhance enterprise-grade web applications and services.
• Collaborate with engineers, product specialists and stakeholders to deliver scalable solutions.
• Contribute to architecture discussions and technical design decisions.
• Mentor junior teammates and support engineering capability growth.
• Improve testing, automation, deployment and development processes.
• Review security and API design to align with standards.

Skills

C#

.NET Framework

ASP.NET

SQL Server

Angular

Entity Framework

TDD

Microservices

Job description

Senior Software Developer - .NET/C#, Microsoft Stack

A leading technology-driven organisation within the Specialty Insurance sector is looking for a Senior Software Developer to join a high-performing engineering team. This is an opportunity to work on business-critical digital platforms, modern cloud-based solutions, and innovative technology initiatives that directly support a rapidly growing international business.

The role involves designing, developing, and enhancing bespoke applications that support core operational and customer-facing services.

This is a business critical role, supporting the modernisation of systems and ensuring the continued growth of the organisation.

Role:

• You'll play a key role throughout the full software development lifecycle, partnering with engineers, product specialists, and business stakeholders to deliver robust, scalable solutions.
• Design, build and enhance enterprise-grade web applications and services.
• Develop scalable solutions across a modern Microsoft technology stack.
• Contribute to architecture discussions and technical design decisions.
• Support the evolution and optimisation of existing business-critical platforms.
• Collaborate with Product Owners and stakeholders to translate requirements into high-quality software solutions.
• Drive improvements in testing, automation, deployment, and development processes.
• Review application security and API design to ensure alignment with established standards.
• Mentor and support other developers, helping to elevate engineering capability across the team.
• Produce and maintain technical documentation where appropriate.

Skills & Experience:

• C# / .NET Framework and .NET Core
• ASP.NET and Web API development
• SQL Server and relational database design
• Angular or modern front-end frameworks
• Entity Framework, Dapper or similar ORM technologies
• Test-Driven Development (TDD) and modern software engineering principles
• Microservices and distributed architectures

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