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sisainfosec·25 days ago

Office Add-ins Developer

Bengaluru, IndiaHybridFull-timeMid · 3-6 years

About this role

   Office Add-ins Developer – Roles and Responsibilities
Location: Bangalore
Employment Type: Full Time / Contractual
Experience: 3-6 Years
Primary Skill: C#, .NET, Office Add-ins Development
Secondary Skill: Node.js, JavaScript / TypeScript, Office.js
Work Type: Hybrid / Office as per project requirement

Job Summary
We are looking for an experienced Office Add-ins Developer with strong hands-on expertise in C#, .NET, VSTO / COM Add-ins, and Microsoft Office application integration.
The candidate should be able to design and develop stable, secure, and high-performance add-ins for Microsoft Office applications such as Word, Excel, PowerPoint, and Outlook. Knowledge of Node.js, JavaScript / TypeScript, and Office.js will be an added advantage for modern Office Web Add-ins development.

Key Responsibilities

Office Add-ins Development
  • Design and develop Microsoft Office add-ins using C#, .NET, VSTO, COM Add-ins, and Office Interop APIs.
  • Build add-in features for Microsoft Word, Excel, PowerPoint, and Outlook.
  • Work with Office object models, Ribbon customization, task panes, event handlers, and document-level operations.
  • Develop reusable components and libraries for Office add-in functionality.
  • Ensure add-ins are stable, responsive, and compatible with supported Office versions.
C# / .NET Development
  • Develop application logic using C#, .NET Framework / .NET, and Visual Studio.
  • Work with Office events such as open, save, close, send, attachment handling, and user actions.
  • Implement document, email, attachment, and metadata-related workflows.
  • Write clean, maintainable, secure, and testable code.
  • Participate in technical design discussions and code reviews.
Office Application Integration
  • Develop features for Outlook email compose, read, send, and attachment workflows.
  • Develop features for Word, Excel, and PowerPoint document processing.
  • Handle document properties, metadata, headers, footers, watermarks, labels, and user prompts where required.
  • Manage Office application behavior, add-in lifecycle, and event-driven functionality.
  • Debug and resolve issues related to Office APIs, COM exceptions, add-in loading, and runtime behavior.
Node.js / Office.js Development
  • Develop or support modern Office Web Add-ins using Office.js, JavaScript / TypeScript, HTML, and CSS.
  • Work with Node.js for Office Web Add-in development and build tooling.
  • Work with add-in manifests, command buttons, task panes, and Office.js APIs.
  • Integrate Office Web Add-ins with backend APIs.
  • Debug add-ins across Microsoft 365, Outlook Web, and supported Office clients.
API and Integration Development
  • Integrate add-ins with backend APIs and enterprise services.
  • Implement REST API communication, authentication, authorization, and token handling.
  • Handle API errors, retries, timeouts, and user-friendly error messages.
  • Work with Microsoft Graph API where required.
  • Ensure secure handling of tokens, user data, document metadata, and sensitive information.
Performance and Code Quality
  • Optimize add-ins for startup time, responsiveness, and memory usage.
  • Ensure add-ins do not impact Office application performance.
  • Follow secure coding practices.
  • Implement proper logging, exception handling, and error diagnostics.
  • Troubleshoot performance issues, memory leaks, and application stability issues.
Mandatory Skills
  • Strong hands-on experience in C# and .NET.
  • Experience in Microsoft Office Add-ins development.
  • Experience with VSTO, COM Add-ins, Office Interop APIs, and Office Object Model.
  • Good understanding of Microsoft Word, Excel, PowerPoint, and Outlook integration.
  • Experience with Ribbon customization, task panes, Office events, and Office UI integration.
  • Strong debugging and troubleshooting skills in Windows desktop application development.
  • Good understanding of REST APIs, authentication, authorization, and secure communication.
  • Ability to write clean, secure, scalable, and maintainable code.
Good to Have Skills
  • Experience with Node.js, JavaScript / TypeScript, HTML, CSS, and Office.js.
  • Experience in developing Office Web Add-ins for Microsoft 365 / Outlook Web.
  • Experience with Microsoft Graph API.
  • Experience with npm, webpack, Vite, or similar JavaScript build tools.
  • Knowledge of Windows registry, certificates, Office Trust Center settings, and Office add-in load behavior.
  • Experience with SQL Server, MySQL, PostgreSQL, or similar databases.
  • Experience in cybersecurity, data protection, compliance, DLP, classification, or enterprise security products will be an added advantage.
Qualification
  • B.E. / B.Tech / MCA / M.Tech in Computer Science, Information Technology, or related field.
  • 3-6 years of software development experience.
  • Minimum 2+ years of hands-on experience in C# / .NET development.
  • Prior experience in Microsoft Office Add-ins, VSTO, COM Add-ins, Office.js, or enterprise desktop application development will be preferred.

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