Senior.NET Developer

Description

Senior.NET Developer needed to support and enhance an energy companies existing application estate. The work is backend-heavy: complex data models, systems integration, API development, and data migration. The developer will take ownership of business-critical applications and must be able to ramp up quickly.

The role sits within a team of 23 across Development, QA, and App Support. A fast start is essential, we need someone who can hit the ground running.

Essential Technical Skills:

• C# /.NET Core — complex backend systems (10+ years)
• Azure — Functions, Web Apps, DevOps, CI/CD pipelines
• SQL Server & database design — data modelling, schema migrations, production deployments
• Entity Framework (EF) Core — migrations, code-first approaches
• Web APIs / RESTful services — design, versioning, backward compatibility
• Microservices architecture — service design, inter-service communication, resilience patterns
• CI/CD — YAML pipelines, multi-environment deployments, IaC (Terraform)
• Git — branching strategies in a team environment
• Desirable:
• Message queuing (RabbitMQ, Azure Service Bus)
• React or Angular front-end capability
• ETL / data integration experience
• TDD / automated testing practices
• experience & Attributes:
• Self-managing — must hit the ground running
• Complex data systems — large data models, integration layers, or operational data stores
• Energy / Utilities sector — highly desirable
• Technical leadership — mentoring junior developers, establishing standards
• Comfortable with ambiguity — evolving requirements, cross-team dependencies
• Strong communicator — able to articulate risks and decisions to non-technical stakeholders

Working Arrangements:

• Hybrid: Manchester office 2-3 days/week (non-negotiable)
• Agile/Scrum, bi-weekly sprints
• Modern tooling including GitHub Copilot, Azure-native stack

Job Title: Senior.NET Developer

Location: Manchester, UK

Job Type: Contract

Trading as TEKsystems. Allegis Group Limited, Maxis 2, Western Road, Bracknell, RG12 1RT, United Kingdom. No. 2876353. Allegis Group Limited operates as an Employment Business and Employment Agency as set out in the Conduct of Employment Agencies and Employment Businesses Regulations 2003. TEKsystems is a company within the Allegis Group network of companies (collectively referred to as "Allegis Group"). Aerotek, Aston Carter, EASi, Talentis Solutions, TEKsystems, Stamford Consultants and The Stamford Group are Allegis Group brands. If you apply, your personal data will be processed as described in the Allegis Group Online Notice available at https://www.allegisgroup.com/en-gb/-notices.

To access our Online Notice, which explains what information we may collect, use, share, and store about you, and describes your rights and choices about this, please go to https://www.allegisgroup.com/en-gb/-notices.

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