Senior Developer, .NET/React

Alcumus

Senior Developer position to shape product architecture and develop solutions in .NET and React at a sustainability certification organization. Collaborate on greenfield projects and utilize AI tools for progressive engineering.

Posted 7/7/2026full-timeLondon • 🇬🇧 United KingdomSeniorWebsite

Tech Stack

Tools & technologies

AzureMongoDB.NETNoSQLReact

About the role

Key responsibilities & impact

Technical Direction & Architecture Collaboration: Work closely with the central architecture team to shape the technical direction of the product, contributing to architectural decisions and ensuring alignment with enterprise standards. Play a key role in delivering a greenfield project
Full Stack Development: Build scalable back-end services using .NET Core and responsive front-end components using React.
AI-Assisted Engineering (Core Expectation): Champion the use of GitHub Copilot as a fundamental part of day-to-day development. Use AI tooling to accelerate delivery, improve code quality, and influence team practices around effective prompting and AI-assisted workflows.
DevOps Practice: Actively utilise Azure DevOps, managing repository pull requests and configuring CI/CD build and release pipelines.
Database Management: Design, optimise, and maintain efficient document schemas and queries in MongoDB.
Integration Support: Integrate with Microsoft Dynamics CRM to streamline business workflows and data synchronisation.
Code Quality & Governance: Write clean, testable code and participate in peer code reviews, ensuring all AI-assisted output meets strict security and architectural standards.

Requirements

What you’ll need

Experience working with architecture functions to influence and implement technical direction, particularly within greenfield or early-stage products.
Strong, hands-on experience using GitHub Copilot (or equivalent) as a core part of development, with the ability to demonstrate how AI can materially improve productivity and code quality.
Strong proficiency in C# and the .NET framework (.NET Core / .NET 6+).
Proven professional experience building modern, component-based web applications with React.
Solid understanding of Azure DevOps (Repos and Pipelines) for agile task tracking and code management.
Hands-on experience working with MongoDB or other NoSQL databases.
Experience building and consuming web services and RESTful APIs.

Benefits

Comp & perks

Enhanced Parental Leave
Generous annual leave, with the option to buy and sell additional days
Healthcare Plan
Annual Giving Day – an extra day to give back to yourself or your community
Cycle-to-work Scheme
Electric Vehicle Scheme
Pension scheme with employer contributions
Life Assurance – 3X base salary
Rewards Program – access to discounts and cashback
LinkedIn Learning License for upskilling & development

ATS Keywords

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Applicant Tracking System Keywords

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Hard Skills & Tools

C# ProgrammingFull Stack DevelopmentReact Application DevelopmentAI-Assisted EngineeringDevOps PracticesCI/CD PipelinesDatabase ManagementRESTful API DevelopmentGitHub CopilotAgile Methodologies

Soft Skills

CollaborationCode ReviewTechnical Direction