Senior Outlook Add-in Developer
<p><b>Salary: £132,000 - 143,000 per year</b></p>
<b>Requirements:</b>
<ul><li>Experience delivering Outlook add-ins within enterprise environments</li><li>Strong hands-on skills with Office.js, JavaScript or TypeScript, HTML, and CSS</li><li>Deep understanding of Microsoft 365, Exchange Online, and behavioral differences between Outlook clients</li><li>Experience integrating with Microsoft Graph, RESTful APIs, and modern authentication methods (OAuth / Azure AD)</li><li>Exposure to CI/CD pipelines, Git-based version control, and automated testing practices (nice to have)</li><li>Experience with Azure services such as App Services, Functions, Storage, or Key Vault (nice to have)</li></ul>
<b>Responsibilities:</b>
<ul><li>Architect, develop, and enhance Outlook add-ins using modern Microsoft frameworks and tools</li><li>Ensure add-ins deliver a consistent experience across all Outlook clients, including desktop, browser, and mobile</li><li>Connect add-ins to backend systems, APIs, and identity services such as Microsoft Graph and Azure Active Directory</li><li>Collaborate closely with product owners, architects, QA, and operations</li><li>Maintain compatibility across Exchange on-premises and Exchange Online deployments</li><li>Produce and maintain technical documentation, design guidelines, and development standards</li></ul>
<b>Technologies:</b>
<ul><li>Active Directory</li><li>Architect</li><li>Azure</li><li>Backend</li><li>CI/CD</li><li>CSS</li><li>Git</li><li>Support</li><li>JavaScript</li><li>Microsoft 365</li><li>Mobile</li><li>OAuth</li><li>TypeScript</li><li>Office 365</li><li>Cloud</li><li>DevOps</li><li>macOS</li><li>Web</li><li>Windows</li></ul>
<p><b>More:</b></p>
<p>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.</p>
<p>last updated 8 week of 2026</p>
<b>Requirements:</b>
<ul><li>Experience delivering Outlook add-ins within enterprise environments</li><li>Strong hands-on skills with Office.js, JavaScript or TypeScript, HTML, and CSS</li><li>Deep understanding of Microsoft 365, Exchange Online, and behavioral differences between Outlook clients</li><li>Experience integrating with Microsoft Graph, RESTful APIs, and modern authentication methods (OAuth / Azure AD)</li><li>Exposure to CI/CD pipelines, Git-based version control, and automated testing practices (nice to have)</li><li>Experience with Azure services such as App Services, Functions, Storage, or Key Vault (nice to have)</li></ul>
<b>Responsibilities:</b>
<ul><li>Architect, develop, and enhance Outlook add-ins using modern Microsoft frameworks and tools</li><li>Ensure add-ins deliver a consistent experience across all Outlook clients, including desktop, browser, and mobile</li><li>Connect add-ins to backend systems, APIs, and identity services such as Microsoft Graph and Azure Active Directory</li><li>Collaborate closely with product owners, architects, QA, and operations</li><li>Maintain compatibility across Exchange on-premises and Exchange Online deployments</li><li>Produce and maintain technical documentation, design guidelines, and development standards</li></ul>
<b>Technologies:</b>
<ul><li>Active Directory</li><li>Architect</li><li>Azure</li><li>Backend</li><li>CI/CD</li><li>CSS</li><li>Git</li><li>Support</li><li>JavaScript</li><li>Microsoft 365</li><li>Mobile</li><li>OAuth</li><li>TypeScript</li><li>Office 365</li><li>Cloud</li><li>DevOps</li><li>macOS</li><li>Web</li><li>Windows</li></ul>
<p><b>More:</b></p>
<p>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.</p>
<p>last updated 8 week of 2026</p>