Office.js Developer (Outlook Add ins) | £500-£550p/day (Inside IR35) | London (Hybrid, 2/3 days in office) | 10 month contract
Our client is looking for a experienced Office Add-in Developer (specialising in Outlook/have worked extensively with) to help support add-in solutions within a enterprise scale messaging environments. The focus of the role will be building robust, cross platform Outlook add-ins that perform across Windows, macOS, web and mobile clients.
It'll be an exchange landscape that's both on-premises infrastructure and Microsoft 365, where you will collaborate closely with engineering, product and operations teams in an agile delivery model.
What you'll be doing:
Architecting, developing, and enhancing Outlook add-ins using modern Microsoft frameworks and tools
Ensuring add-ins deliver a consistent experience across all Outlook clients, including desktop, browser, and mobile
Connecting add-ins to backend systems, APIs, and identity services such as Microsoft Graph and Azure Active Directory
You'll be working closely with product owners, architects, QA, and operations
Maintaining compatibility across Exchange on-premises and Exchange Online deployments
Producing and maintaining technical documentation, design guidelines, and development standards
What we're looking for:
You can demonstrate 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 the behavioral differences between Outlook clients
Experience integrating with Microsoft Graph, RESTful APIs, and modern authentication methods (OAuth / Azure AD)
Nice to have:
Exposure to CI/CD pipelines, Git-based version control, and automated testing practices
Experience with Azure services such as App Services, Functions, Storage, or Key Vault
Candidates will be required to go through background checks before commencing contract.
Must be eligible to live and work in the specified work location. Some occasional travel maybe required. Only successful candidates will be contacted.
EQUAL OPPORTUNITIES Our client is committed to equal opportunities and actively seeks applications from all sectors of the community irrespective of sex, race, colour, nationality, ethnic or national origin, disability, marital status, sexual orientation, having responsibility for dependents, age, religion/beliefs, or any other reason which cannot be shown to be justified
If this sounds like a good fit, apply now!
Office.js Developer (Outlook Add ins) | £500-£550p/day (Inside IR35) | London (Hybrid, 2/3 days in office) | 10 month contract
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