Microsoft Teams App Developer / Microsoft 365 Solutions Developer

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)