Platform Developer

Senior Platform Developer – Enterprise Workflow & Integration Platform

Remote

We're looking for an experienced Platform Developer to join an established engineering team working on a business-critical enterprise workflow and project reporting platform. You'll be joining an existing team with an established codebase, delivery process and release pipeline. Rather than owning the entire programme, you'll take ownership of specific modules, integrations and technical workstreams, working alongside colleagues who have strong knowledge of the existing platform.

You'll work across a range of enterprise functionality, including:

• Building and enhancing .NET / C# and ASP.NET Web API services.
• Developing REST APIs for data extraction, including versioned contracts, authentication and incremental/full data exports.
• Designing and building cost management and project reporting functionality, covering budgets, manpower, CAPEX and OPEX.
• Developing SAP integrations to support real-time financial and budget tracking.
• Extending data models to support opportunity, project and gate-based processes.
• Building workflow and approval processes, including configurable approval chains, task assignment and governance routes.
• Developing decision, status and submission versioning functionality.
• Implementing configurable fields, validation rules, access controls and audit logging.
• Supporting executive dashboards and reporting across project and portfolio data.
• Integrating with Microsoft 365, Outlook and directory/identity services.
• Contributing to responsive and accessible front-end functionality where required.

You'll need strong production experience with:

• C# / .NET
• ASP.NET Web API
• SQL Server
• REST API design and system-to-system integrations
• Enterprise workflow applications and configurable business rules
• Role-based access control, approvals and audit trails
• Data modelling, particularly around costs, budgets and project hierarchies
• Responsive and accessible front-end development
• Working effectively within an existing codebase and established engineering team
• SAP integration, particularly financial/budget data
• Microsoft BI stack – SSRS / Power BI
• Microsoft 365 / Entra ID
• Experience exposing data from an existing platform into a replacement system
• Experience with stage-gate, innovation or R&D portfolio management
• CI/CD and automated testing experience
• OpenAPI and Postman

You'll work within an established engineering process, contributing to:

• Existing CI/CD and release pipelines
• Automated testing and test evidence
• OpenAPI specifications and Postman collections
• Data model and integration documentation
• User/admin guidance and technical handover

This is a great opportunity for a senior .NET engineer who enjoys working on complex enterprise applications, integrations and workflow-driven platforms, while having genuine ownership of specific technical modules within an established team.