Senior Outlook Add-in Developer

• Architect, develop, and enhance Outlook add-ins using modern Microsoft frameworks and tools
• Ensure add-ins deliver a consistent experience across all Outlook clients, including desktop, browser, and mobile
• Connect add-ins to backend systems, APIs, and identity services such as Microsoft Graph and Azure Active Directory
• Collaborate closely with product owners, architects, QA, and operations
• Maintain compatibility across Exchange on-premises and Exchange Online deployments
• Produce and maintain technical documentation, design guidelines, and development standards

Technologies:

• Active Directory
• Architect
• Azure
• Backend
• CI/CD
• CSS
• Git
• Support
• JavaScript
• Microsoft 365
• Mobile
• OAuth
• TypeScript
• Office 365
• Cloud
• DevOps
• macOS
• Web
• Windows, We are seeking an experienced Senior Outlook Add-in Developer to join our team on a 10-month contract, paying between £500-£550 per day. This hybrid role is based in South Yorkshire, requiring 2-3 days in the office each week. You will support add-in solutions within enterprise-scale messaging environments, focusing on building robust, cross-platform Outlook add-ins that perform across various clients. We are committed to equal opportunities and welcome applications from diverse backgrounds.

• Experience delivering Outlook add-ins within enterprise environments
• Strong hands-on skills with Office.js, JavaScript or TypeScript, HTML, and CSS
• Deep understanding of Microsoft 365, Exchange Online, and behavioral differences between Outlook clients
• Experience integrating with Microsoft Graph, RESTful APIs, and modern authentication methods (OAuth / Azure AD)
• Exposure to CI/CD pipelines, Git-based version control, and automated testing practices (nice to have)
• Experience with Azure services such as App Services, Functions, Storage, or Key Vault (nice to have)