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Microsoft Teams development

Microsoft Teams App Development & Extensions

Bring approvals, data and business apps into the place your people already work.

We build custom apps for Microsoft Teams: tabs that show your business data, bots and agents that answer questions, message extensions, and interactive approval cards connected to systems like Business Central, Dynamics 365 and SharePoint. People act on work without switching between five applications.

  • Pune, India · since 2011
  • Microsoft 365 · Power Platform · Dynamics 365
  • Remote delivery worldwide
Collaboration app with a custom purchase approval card, an app tab and a bot replyTeams · Procurement channel ChatTeamsApps ProcurementPostsFilesApprovalsVendor portal Approvals appjust now Purchase request PR-2291Requested by Operations · Plant 2 ItemHydraulic pump (2 units)Amount₹ 1,84,000Budget lineMaintenance 2026VendorApproved vendor V-104 ApproveRejectView in ERP ↗ Procurement bot ✓ Approved by Finance. PO created in Business Centraland the requester was notified. MessageextensionAgent
Illustrative custom app. Approvals as an interactive card, an app tab, and a bot that confirms the result.
Sound familiar?

When collaboration and work live in different places

“Approvals sit in someone’s inbox.”

Requests wait days because approvers have to log into another system to act.

“We chat in Teams but work elsewhere.”

People copy data between Teams, spreadsheets and the ERP, and mistakes creep in.

“Teams is a free-for-all.”

Hundreds of teams and channels with no owner, naming or lifecycle.

What we deliver

Teams apps built around your processes

Built with Microsoft’s current development tools and published to your organisation’s app catalogue.

Custom tabs & personal apps

Dashboards, forms and line-of-business screens inside Teams, with single sign-on.

Approval & notification cards

Adaptive cards that let people approve, reject or comment directly in chat or a channel.

Bots & agents

Conversational bots and Copilot agents that answer questions and complete tasks in Teams.

Message extensions

Look up a customer, order or ticket and share it into a conversation in two clicks.

Integrations

Connections to Business Central, Dynamics 365, SharePoint, Power Automate and your APIs through Microsoft Graph and connectors.

Teams governance

Naming, ownership, guest access and lifecycle policies so Teams stays organised.

What’s new in 2026

Teams apps are becoming agents

Microsoft has expanded what a Teams app can be. What that means for your project:

  • Microsoft 365 Agents Toolkit (formerly Teams Toolkit) builds apps and agents that work across Teams, Outlook and Microsoft 365 Copilot
  • Agents in Teams: your app can act as a Copilot agent, answering questions from your data and taking actions
  • Adaptive Cards everywhere: one approval card works in Teams chats, channels and Outlook
  • Teams Phone: calling integrated with existing phone systems through Direct Routing or Operator Connect, when voice is in scope

Some Microsoft features need specific licences or pay-as-you-go billing. We confirm what your plan includes before we design around it.

Collaboration app with a custom purchase approval card, an app tab and a bot replyTeams · Procurement channel ChatTeamsApps ProcurementPostsFilesApprovalsVendor portal Approvals appjust now Purchase request PR-2291Requested by Operations · Plant 2 ItemHydraulic pump (2 units)Amount₹ 1,84,000Budget lineMaintenance 2026VendorApproved vendor V-104 ApproveRejectView in ERP ↗ Procurement bot ✓ Approved by Finance. PO created in Business Centraland the requester was notified. MessageextensionAgent
Illustrative custom app. Approvals as an interactive card, an app tab, and a bot that confirms the result.
How we deliver

From idea to an app in your Teams catalogue

1

Scope

The process, users and systems involved.

2

Prototype

Clickable screens or cards to validate quickly.

3

Build

App, API connections and single sign-on.

4

Test

Pilot users, security review and fixes.

5

Publish

Admin approval and rollout via your app catalogue.

6

Support

Updates as Teams and your processes change.

What you get

Work done where conversations happen

  • A production-ready Teams app in your organisation’s catalogue
  • Approvals completed in chat, with an audit trail in the source system
  • Single sign-on with Microsoft Entra ID, no extra passwords
  • Source code, documentation and admin handover
  • A governance policy for teams, channels and guests
Who it’s for

Popular Teams app ideas

Purchase & expense approvals

Approve requests from the ERP inside Teams.

HR self-service

Leave, onboarding and policy questions in one app.

Field & operations updates

Job status and photos shared from site.

Sales lookups

Customer and order details from CRM in any chat.

Have a process people keep chasing by email?

That is usually the best first Teams app. Tell us about it and we’ll sketch the solution.

Discuss Your Teams App
Why STW Services

One team for Microsoft 365, Power Platform and business systems

We build on what your business already runs, so documents, workflows and data connect instead of multiplying.

Since 2011

Delivering Microsoft-based business solutions from Pune, India, for clients worldwide

Joined-up delivery

SharePoint, Teams, Power Automate, Copilot Studio and Dynamics 365 in one team

Built to be owned

Documented solutions, admin training and handover, so you are never locked in

Support after go-live

Ongoing help, health checks and improvements when you need them

FAQ

Teams app questions, answered

Plain answers to what business owners ask before they start.

Ask us a question
What can a custom Teams app do?

Show business data in tabs, let users act through cards and message extensions, answer questions through bots and agents, and connect to almost any system with an API.

Do we need special licences?

Custom apps run in standard Microsoft 365 Teams licences. Copilot agent features need Copilot licences or pay-as-you-go, and Teams Phone has its own licensing; we confirm this during scoping.

Can approvals connect to our ERP?

Yes. Approval cards can read from and write back to systems such as Business Central or Dynamics 365, so the decision is recorded where it belongs.

Should we build a Teams app or use Power Apps?

Power Apps is ideal for simple forms and internal tools; a custom Teams app suits richer experiences, bots and complex integrations. We recommend the lighter option when it is enough.

Is it secure?

Apps use Microsoft Entra ID single sign-on and respect your existing permissions, and they are published through your admin-controlled app catalogue.

Can you help organise our existing Teams?

Yes. Teams governance covers naming, ownership, guest access, archiving and templates.

Next step

Tell us what you want to do in Teams

Describe the process and the systems involved. We’ll come back with an approach, a first-version scope and an estimate.

  • A reply from a Microsoft 365 specialist
  • A practical first-step plan, whether or not we work together
  • No obligation

Discuss Your Teams App

Tell us what you use today and what you want to achieve. A Microsoft 365 specialist will reply with practical next steps.

  • Describe your Microsoft 365 or SharePoint need in the form
  • Share what you use today (file server, SharePoint version, Teams)
  • Or email support@stw-services.com
Discuss Your Teams App