Microsoft Teams App Developer / Microsoft 365 Solutions Developer
Outside IR35 | Contract | Hybrid – High Wycombe
Contract: Outside IR35
Location: Hybrid (High Wycombe – on-site as required)
Start: ASAP
Duration: Initial contract with extension potential


The Opportunity
We are looking for an experienced Microsoft Teams App Developer to deliver a custom real-time meeting, microphone, and voting system built directly into Microsoft Teams.
This project replaces traditional dedicated conference and voting hardware with a modern, software-based solution. You’ll be building both the delegate-facing Teams app used in live meetings and the administrative control systems used to manage speakers, microphones, and voting in real time.
This is a specialist contract role requiring deep Microsoft Teams platform experience, real-time systems knowledge, and strong enterprise UX instincts.


What You’ll Be Working On
Delegate-Facing Teams Application
*Design and build a custom Microsoft Teams meeting app / tab
*Develop a clear, intuitive UI for live meetings, including:
*Microphone request and speaker queue indicators
*Live "Mic On / Mic Off" status
*Dynamic voting interfaces (2–5 buttons depending on vote type)
*Deliver real-time visual feedback:
*Vote open / closed states
*Confirmation of submitted votes
*Secret vs non-secret voting behaviour
*Ensure the app is reliable, accessible, and easy to use in high-pressure live meeting environments
Administrative Control & Backend Systems
*Build backend services allowing administrators (ACCS) to:
*Start, end, and manage votes
*Define vote types, labels, and rules
*View live vote counts and participation
*Identify or anonymise delegates depending on vote configuration
*Implement role-based access control:
*Ensure only eligible delegates can vote
*Support inclusion/exclusion logic based on delegate data
*Develop secure, scalable APIs and real-time communication layers
Microsoft Teams Platform Integration
*Integrate with Microsoft Teams meeting context and lifecycle
*Handle user and meeting identity
*Integrate microphone and mute state (within Teams platform constraints)
*Manage speaker queues and live meeting state
*Work pragmatically within Teams SDK limitations while delivering a robust UX


Technical Environment
Front End
*React
*TypeScript
*Microsoft Teams JavaScript SDK
*Fluent UI
Backend & Cloud
*ASP.NET Core (C#) or Node.js
*Azure Functions and/or Azure App Service
*Azure SignalR or WebSockets
*Microsoft Graph API (Teams, users, meetings)
Architecture & Concepts
*Real-time systems
*Role-based identity and permissions
*Secure enterprise authentication
*High-availability, fault-tolerant design


What We’re Looking For
Essential
*Proven experience building custom Microsoft Teams applications
*Strong Microsoft 365 and Azure experience
*Solid React and TypeScript skills
*Backend API development experience (C#/.NET or Node.js)
*Experience with real-time communication patterns
*Strong enterprise UX mindset — clear, accessible, and foolproof
*Ability to work with platform constraints and still deliver reliable solutions
Nice to Have
*Experience with conference, event, or voting systems
*Government, parliamentary, or regulated environments
*AV / IT hybrid systems
*Security-sensitive or high-availability platforms


Why This Contract
*Outside IR35
*Technically interesting, specialist Teams development
*Real-time systems rather than CRUD apps
*Clear deliverables and genuine engineering challenges
*Hybrid working with flexibility (High Wycombe)