Office Add-ins: The Future of Workflow Automation
Explore the latest trends and innovations in Office Add-ins, from AI-powered automation to seamless integration with Microsoft 365.
Read moreMicrosoft 365 Certified Solutions
Powerful Microsoft Excel Add-in
Enhance your workflow with enterprise-grade add-ins. We build bespoke tools that turn complex tasks into one-click solutions.
What We Do
Professional Office automation solutions architected for modern enterprises looking to bridge the gap between their data and productivity tools.
Office Add-ins Development
Custom Microsoft Office 365 add-in development for Excel, Word, Outlook, PowerPoint, SharePoint, and Teams. Hire certified Office.js developers for enterprise automation, AppSource publishing, and VSTO migration.
Google Workspace Add-ons
Custom Google Workspace add-on development for Sheets, Docs, Gmail, and Drive. Professional Apps Script and REST API solutions for Google Workspace automation.
Authentication & Identity
Secure authentication development services including Microsoft SSO, Azure AD, OAuth 2.0, OpenID Connect, MFA, and role-based access control for web and enterprise Office 365 applications.
AppSource Publishing Services
End-to-end Microsoft AppSource publishing and certification support for Office add-ins. We handle code review, manifest optimization, compliance validation, and submission — getting your add-in approved on the first attempt.
Featured Services
Office Add-ins Development
Custom Microsoft Office 365 add-in development for Excel, Word, Outlook, PowerPoint, SharePoint, and Teams. Hire certified Office.js developers for enterprise automation, AppSource publishing, and VSTO migration.
Get it today
Authentication & Identity
Secure authentication development services including Microsoft SSO, Azure AD, OAuth 2.0, OpenID Connect, MFA, and role-based access control for web and enterprise Office 365 applications.
Get it today
AppSource Publishing Services
End-to-end Microsoft AppSource publishing and certification support for Office add-ins. We handle code review, manifest optimization, compliance validation, and submission — getting your add-in approved on the first attempt.
Get it today
Excel Add-ins Development
Custom Excel add-in development using Office.js, React, and TypeScript. We build enterprise-grade Excel automation tools, financial models, data analysis add-ins, and AppSource-ready solutions for Excel 2016 through Microsoft 365.
Get it today
Outlook Add-ins Development
Custom Outlook add-in development for email automation, CRM integration, and calendar workflows. We build contextual Outlook add-ins using Office.js for Outlook 2016 through Microsoft 365 — AppSource-ready and enterprise-secure.
Get it today
PowerPoint Add-ins Development
Custom PowerPoint add-in development for slide automation, branded presentation generation, and design system integration. We build Office.js PowerPoint add-ins for enterprise consulting, sales, and marketing teams — AppSource-ready.
Get it today
SharePoint Add-ins Development
Custom SharePoint add-in development and SPFx web part development for intranet automation, document management, and enterprise portal solutions. Specialist SharePoint developers for Microsoft 365 and SharePoint Online.
Get it today
Teams Add-ins Development
Custom Microsoft Teams add-in development — tab apps, bots, messaging extensions, and meeting apps built for enterprise collaboration workflows. Specialist Teams app developers for Microsoft 365.
Get it today
Why Choose Us
We combine deep technical expertise with a focus on enterprise productivity to deliver high-impact automation solutions.
250+Projects Delivered
98%Client Satisfaction
4+Years Experience
PartnerMicrosoft Network
Fast Delivery
Optimized development cycles: Most projects ready in 2-8 weeks.
Enterprise Security
Full integration with Azure AD, SSO, and Microsoft Graph security protocols.
Expert Team
Direct access to certified Microsoft developers and cloud architects.
Technologies We Master
Office.jsReactTypeScriptAzureMS GraphApps ScriptNode.js
What Our Clients Say
Join 500+ businesses who trust us with their critical Office automation and enterprise add-in development.
"The Excel add-in developed by this team transformed our data reporting workflow. What used to take 4 hours now happens in minutes with 100% accuracy."
J
John SmithCTO, TechCorp Solutions
"Expert knowledge of the Microsoft Graph API. They built a seamless Outlook integration that helped our sales team sync CRM data without leaving their inbox."
S
Sarah JenkinsOperations Manager, Global Logistics
"Navigating AppSource certification is tough, but they handled everything. Our Word add-in was approved on the first try thanks to their clean code."
M
Michael ChenProduct Lead, Innovate Edu
How we build for Microsoft 365
A structured, compliant, and performance-focused development lifecycle aligned with Microsoft AppSource standards.
STEP 01
Planning & Analysis
Gathering stakeholder requirements and defining scope against Office JS API capabilities.
STEP 02
Architectural Design
Designing Task Pane interfaces using Fluent UI components for a native Microsoft experience.
STEP 03
Development
Iterative coding of manifests and web logic with real-time Office sideloading tests.
STEP 04
QA & Security
Rigorous bug identification and validation against Microsoft security standards.
STEP 05
Deployment
Global rollout via AppSource or centralized tenant deployment via M365 Admin Center.
STEP 06
Maintenance
Ongoing monitoring and compatibility updates for new Microsoft 365 releases.
From the Blog
Microsoft SSO and Azure AD in Office Add-ins
Implement Single Sign-On and Azure AD authentication in your Office Add-ins for a seamless, secure user experience.
Read moreExcel Add-ins: Automate Data and Workflows with Office.js
How to build Excel add-ins that automate data entry, analysis, and reporting using Office.js and the Excel JavaScript API.
Read moreGetting Started with Office Add-ins: A Developer's Guide
Learn the fundamentals of building Microsoft Office Add-ins with Office.js, from project setup to deployment and AppSource publishing.
Read moreFrequently asked questions
Do you build VSTO and Office.js add‑ins?
Yes. I build modern Office.js add‑ins and maintain/extend legacy VSTO/COM solutions, including migration paths to ensure your tools stay current.
Can you integrate Microsoft Graph and webhooks?
Absolutely—OAuth, SSO, Graph data, subscriptions/webhooks, and backend services are common parts of my projects.
How do deployments work?
I support centralized deployment to your tenant and AppSource submissions, with full CI/CD, validation, and documentation.
Next Steps
Modernize your enterprise with custom Office solutions.
Work with certified Microsoft developers to bridge the gap between your unique data and the tools your team uses every day.
Why start now?
- Reduce manual data entry by up to 80%
- Deploy secure SSO-ready add-ins
- Azure-backed infrastructure
Quick Contact
info@msofficeaddin.comContact us
Have a project in mind? We're here to help.
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info@msofficeaddin.com
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Consultation
Book a technical discovery call
Global Support
Working with clients across North America, Europe, and Asia.