Senior Developer

Role Purpose

Join a blended agile delivery squad working on large-scale, secure digital services for a government client.

As a Senior Developer, you will bring strong hands-on experience across both .NET and Python, contributing to cloud-native API development, Legacy modernisation, and DevSecOps practices - all within a Microsoft Azure environment and aligned to the highest engineering and security standards.

Key Responsibilities

• Design, develop, and maintain full-stack applications and services using .NET Core and Python.
  

• Build and consume RESTful APIs following API-first and microservices design principles.
  

• Contribute to CI/CD pipelines in Azure DevOps - build, test, and deployment automation.
  

• Apply DevSecOps practices including SAST/DAST scanning, dependency management, and environment segregation.
  

• Participate in code reviews, uphold coding standards, and implement secure development practices.
  

• Support Legacy system modernisation - migrating from older Windows and .NET Framework environments.
  

• Produce clear technical documentation and contribute to architecture artefacts.
  

• Ensure all developed solutions meet WCAG AA accessibility standards.
  

• Work collaboratively with architects, lead developers, and delivery managers within an agile squad.
  

• Contribute to knowledge transfer and onboarding activities for client and team staff.
  

Security Clearance - Mandatory

SC (Security Check) clearance is mandatory for this role.

Candidates must be eligible to obtain SC clearance. British nationality or a minimum of 5 years' UK residency is typically required.

Clearance will be sponsored upon appointment.

Essential Skills & Experience:

• Strong hands-on C# with solid grasp of OOP, design patterns, and SOLID principles.
  

• Experience building production-grade applications in both .NET Core and Framework environments.
  

Core Languages - .NET Core 10.0 & .NET Framework 4.8  - Mandatory

• Proficiency with Astral UV, virtual environments, and Python dependency management.
  

• Ability to build, maintain, and deploy Python-based services and tooling.
  

• JavaScript/TypeScript
  

Cloud, DevOps & Infrastructure - Mandatory

• Microsoft Azure - Cloud-Native Development Experience
  
• Azure DevOps - CI/CD Pipeline Design and Management
  
• Infrastructure as Code - Terraform and/or Bicep
  
• Containerisation - Docker and/or Kubernetes
  

Development Practices - Mandatory

• RESTful API design, development, and life cycle management 
  

• Secure development - SAST/DAST tooling, code review, OWASP awareness 
  

• Technical documentation to a high standard 
  

• On-site in Taunton, Somerset - 2 days per week minimum 
  

Desirable Skills & Experience

• Legacy Windows technologies - Win32, WPF, MFC/ATL, COM, MSI packaging. 
  

• Geospatial data formats - GeoJSON, MBTiles, GML. 
  

• Familiarity with MOD Secure by Design and NCSC software security standards. 
  

• Experience working in UK public sector or government digital services. 
  

• Python geospatial tooling or data pipeline experience. 
  

Tech Stack:

Backend: .NET Core 10.0, .NET Framework 4.8, C#, Python (Astral UV), REST APIs, Microservices

Frontend: JavaScript, TypeScript, HTML5, CSS3, WCAG AA

Cloud & DevOps: Microsoft Azure, Azure DevOps, CI/CD, Terraform, Bicep, Docker, Kubernetes

Security: SAST/DAST, Secure by Design, SC Clearance (Mandatory)

Geospatial: GeoJSON, MBTiles, GML (desirable)

Tools: Git, Jira, Confluence, Azure DevOps Boards

We welcome applications from candidates of all backgrounds and actively encourage individuals from underrepresented groups, including women, people with disabilities, and diverse communities, as well as those seeking flexible working arrangements.

As a Disability Confident Level 1 employer, we are committed to providing reasonable adjustments throughout the recruitment process and during employment to ensure equal opportunities for all.