Hybrid Javascript Developer – M365 Office Add-ins

at Avvoka

• Job title: Javascript Developer – M365 Office Add-ins
• Job type: Full Time
• Experience level: Mid level, Senior
• Salary: Not specified
• Degree requirement: Bachelor's Degree
• Tech skills: Azure, JavaScript, Jest, React, TypeScript, Vue.js
• Location requirements: Hybrid, Prague, Czech

About the role

• JavaScript Developer creating high-quality Office Add-ins for M365 at Avvoka. Focused on optimizing plugin performance and enhancing user experience within Microsoft applications.

Responsibilities

• Develop and Enhance Microsoft 365 Plugins
• Design, develop, and maintain high-quality Office Add-ins for Word, Outlook, and other M365 applications using JavaScript and TypeScript
• Implement secure and scalable integrations with Microsoft Graph API and other Office JS SDKs
• Ensure consistent user experiences between the plugin and the core web platform
• Integrate AI-Powered Features
• Work closely with AI engineers to integrate intelligent suggestions, content generation, and automation features directly into the Microsoft plugin environment
• Implement API connections to internal and third-party AI services (e.g., OpenAI, Azure Cognitive Services)
• Optimize performance for real-time, context-aware AI interactions within Office documents
• Write and Maintain Robust, Scalable Code
• Deliver clean, maintainable, and testable TypeScript/JavaScript code aligned with modern standards
• Build for reliability, performance, and security within enterprise-grade environments
• Continuously improve code quality through refactoring, testing, and automation
• Collaborate and Communicate
• Partner with product managers, designers, and AI engineers to define and deliver impactful plugin features
• Participate in technical discussions and contribute to architectural decisions for the plugin ecosystem
• Provide clear documentation, technical insights, and code reviews to ensure consistent engineering standards
• Drive Innovation and Technical Excellence
• Stay current with advancements in Microsoft 365 development, AI APIs, and JavaScript frameworks
• Champion best practices in testing, CI/CD, and deployment for Office Add-ins
• Experiment with emerging AI/ML tools and evaluate their potential for enhancing user experience

Requirements

• Strong proficiency in JavaScript and TypeScript (typically 5+ years).
• Solid frontend experience with frameworks like React or Vue.js.
• Experience building production web apps: RESTful APIs, OAuth2 flows and secure authentication.
• Proven ability to debug and optimise complex UI performance issues.
• Comfortable working with product and design teams and owning end-to-end delivery.
• Hands-on experience developing Office Add-ins using Office.js and integrating with Microsoft Graph.
• Familiarity with Azure, OpenAI, or Cognitive Services for AI integrations.
• Background in B2B SaaS or document automation platforms.
• Exposure to testing frameworks (Jest, Playwright) and CI/CD for plugin deployment.
• Understanding of accessibility, UX principles, and UI performance optimisation.

Benefits

• Remote-first working policy – employees are empowered to work from home and come into the office based on role and business requirements
• Home office IT allowance (eligibility criteria apply)
• Annual learning and development budget (eligibility criteria apply)
• Clear pathways for professional development and career growth
• Flexible dress code (role-based requirements apply)