Full Stack Developer (Microsoft Fabric/DIAS)

Contract: end March 2026 (extensions in view)
Rate: £620 per day (Inside IR35)

Location: Mostly remote
Security Clearance: Active SC required

Start: Immediate

We are looking for an experienced Full Stack Developer to support the development of user-facing applications built on top of DIAS running on Microsoft Fabric. This role focuses on building secure, high-performance web applications and APIs that enable analysts, policy teams and operational users to explore and interact with complex datasets and LLM-powered capabilities.

Key Deliverables

• Design, build and maintain user-facing web applications on top of DIAS/Fabric data

• Implement, alongside other engineers, a high-quality medallion architecture and STAR schemas to support cross-source data matching

• Develop features to support highly granular cross-database searches

• Build secure, performant Back End APIs and services to expose DIAS data and LLM functionality

• Deliver Front End features, visualisations and workflows for analysts, policy and operational users

• Integrate with Microsoft Fabric (Lakehouse, Warehouses, Power BI, LLM endpoints) and other HMT systems

• Implement authentication, authorisation and RBAC in line with HMT security and data access policies

• Build UI components to support LLM use cases (chat interfaces, prompt tooling, feedback capture, evaluation dashboards)

• Maintain CI/CD pipelines, automated testing and monitoring across Front End and Back End services

Key Skills Required

• Strong experience with a modern Front End framework (React, Angular or Vue) using TypeScript/JavaScript

• Proven experience building REST and/or GraphQL APIs (eg .NET, Node.js, Python/FastAPI)

• Solid understanding of web security, OAuth/OpenID Connect and role-based access control

• Experience integrating with data and analytics platforms (ideally Microsoft Fabric, Power BI and Azure services)

• Familiarity with LLM integration patterns (API usage, RAG, prompt design, feedback and telemetry capture)

• Strong Git and DevOps capability, including CI/CD pipelines and automated testing

• Comfortable working closely with designers, data engineers, analysts and policy teams, with the ability to clearly explain technical decisions

Please note: Active SC clearance is mandatory. This role is inside IR35, mostly remote, and requires an immediate start.