Senior.NET Developer

A top energy company is looking for a senior.NET developer to join their team, supporting and enhancing their existing application estate. This role is heavily backend‑focused, working across complex data models, systems integration, API development, and data migration. You’d take ownership of business‑critical applications and will need to ramp up quickly in a fast‑moving environment.

Key Focus Areas

• Ownership of core backend applications
• Systems integration, RESTful API development, and data migrations
• Enhancing existing.NET Core services and backend components
• Contributing to architecture and microservices best practice
• Supporting Azure‑native deployments and CI/CD improvements

Essential Experience

• 10+ years with C# /.NET Core
• Strong Azure Experience (Functions, Web Apps, DevOps, CI/CD)
• SQL Server — data modelling, schema changes, production deployments
• Entity Framework Core — code‑first, migrations
• REST APIs and microservices design
• CI/CD (YAML), IaC (Terraform), Git

Nice to Have

• Message queues (RabbitMQ, Service Bus)
• React/Angular exposure
• ETL / data integration
• Automated testing / TDD

Attributes

• Able to hit the ground running
• Strong communicator, comfortable with complex systems
• Energy/Utilities background is desirable
• Technical leadership / mentoring experience

Working Model Hybrid: Manchester, 3 days/week.

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.

We are part of a global network of companies and as a result, the personal data you provide will be shared within Allegis Group and transferred and processed outside the UK, Switzerland and European Economic Area subject to the protections described in the Allegis Group Online Notice. We store personal data in the UK, EEA, Switzerland and the USA. If you would like to exercise your rights, please visit the "Contacting Us" section of our Online Notice at https://www.allegisgroup.com/en-gb/-notices for details on how to contact us. To protect your and security, we may take steps to verify your identity, such as a password and user ID if there is an account associated with your request, or identifying information such as your address or date of birth, before proceeding with your request. If you are resident in the UK, EEA or Switzerland, we will process any access request you make in accordance with our commitments under the UK Data Protection Act, EU-U.S. Shield or the Swiss-U.S. Shield.