Montash
Senior Full Stack .NET Developer (SC Cleared)
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Job Title: Senior Full Stack.NET Developer (SC Cleared)
Location: Remote (with ad-hoc travel to client's office in London - likely once a month)
Contract Length: 12 Months (with scope to extend)
Start Date: ASAP
IR35: Inside
Interview Process: 1 Stage, MS Teams
Clearance Required: SC (needs to have been used within the past 10 months)
We are supporting a government client in hiring a Senior Full Stack.NET Developer to join their engineering team, providing technical leadership across the development lifecycle while supporting the delivery, enhancement, and operation of a business-critical platform.
This is a hands-on senior development role covering application design, build and delivery, alongside code review, technical assurance, and mentoring of less experienced engineers and apprentices. The successful candidate will need strong, demonstrable experience across C#/.NET application development, AWS/cloud-native delivery, CI/CD pipelines, and application monitoring, while acting as a technical lead across assigned work packages and development teams.
This role suits an experienced Senior Full Stack.NET Developer comfortable leading feature delivery and mentoring engineers within a secure, business-critical environment, and participating in incident response and on-call rotas as required, given that many of the supported systems operate 24/7.
Key Responsibilities
- Lead the delivery of development work packages and complex software changes across the platform
- Design, develop, and maintain application services using C#,.NET, React, Vue.js, and REST APIs
- Conduct peer reviews and technical assurance activities to maintain code quality, security, and maintainability
- Support solution design activities and contribute to technical decision-making within Agile delivery teams
- Support microservice-based and cloud-native solutions running on AWS
- Develop and maintain CI/CD pipelines using Jenkins and GitLab
- Mentor and coach developers, apprentices, and less experienced engineers, providing guidance on engineering standards and best practices
- Investigate and resolve complex technical issues affecting application services and platform integrations
- Collaborate with Product Managers, Delivery Managers, architects, and engineering teams to support successful delivery outcomes
- Contribute to operational support, incident resolution, and continuous service improvement activities
- Maintain technical documentation, engineering standards, and knowledge-sharing materials
- Participate in operational support activities, incident response, and on-call rotas as required
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Essential Skills
- Strong hands-on C#,.NET, and Entity Framework experience, with solid object-oriented design and SOLID principles
- Strong experience with JavaScript, React, and Vue.js, including REST API development and microservices architecture
- Experience leading software delivery, code reviews, and technical assurance, and mentoring or coaching less experienced engineers
- Experience with Windows Presentation Foundation (WPF)
- Strong secure coding practices
- Hands-on AWS experience, including Docker-based deployment
- Experience implementing and maintaining CI/CD pipelines using Jenkins and GitLab
- Understanding of Infrastructure as Code principles
- Experience with application monitoring and observability
- Experience with PostgreSQL
- Experience with Elastic and Kibana, including application monitoring, troubleshooting, and performance optimization
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Desirable Skills
- Experience with AWS SageMaker
- Experience integrating AI and Large Language Models (LLMs)
- Experience with data analytics and reporting solutions, including Python-based analytical tooling
- Experience with Terraform
- Experience with NGINX
- Linux and Windows administration experience
- Experience with API Gateway and Transit Gateway
- Experience with VPN/OpenVPN technologies
- Experience with ServiceNow (SNOW), including incident and problem management
- Experience with production support within 24x7 environments, including root cause analysis and service improvement
- Experience supporting Commercial Off-The-Shelf (COTS) products in secure environments
- Experience integrating or supporting intelligence and analytical platforms such as SOLAR, MAT, or equivalent products
- Understanding of operational support and troubleshooting of partner-provided solutions
- Knowledge of GDS and security standards
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