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Senior/Staff Software Engineer, OfficeJS

United States, New York 200000.00 - 312000.00 USD / Year · Job Posted February 18, 2026
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Job Description

At Harvey, we’re transforming how legal and professional services operate — not incrementally, but end-to-end. By combining frontier agentic AI, an enterprise-grade platform, and deep domain expertise, we’re reshaping how critical knowledge work gets done for decades to come. This is a rare chance to help build a generational company at a true inflection point. With 1000+ customers in 58+ countries, strong product-market fit, and world-class investor support, we’re scaling fast and defining a new category in real time. The work is ambitious, the bar is high, and the opportunity for growth — personal, professional, and financial — is unmatched.

Job Responsibility

  • Own and lead the technical direction of Harvey in Word, our flagship Office Add-in product, alongside our other Microsoft Office integrations
  • Build the AI-native editing experience: agentic document rewrites, real-time redlining, and playbook automation that transforms how lawyers work
  • Design and build sophisticated integrations with Microsoft Word using the OfficeJS API, including document manipulation, playbook reviews, and AI-assisted drafting
  • Architect scalable, maintainable solutions that handle the constraints and quirks of the Office Add-in environment across platforms (Windows, Mac, Web)
  • Build polished, high-performance interfaces with crisp interactions and resilient error handling
  • Collaborate with product, design, and backend teams to shape APIs and UX for AI-powered features like streaming results and tool-calling workflows
  • Navigate Office Add-in requirement sets, versioning, and cross-platform compatibility to ensure broad, reliable support
  • Contribute to Harvey in Outlook and shape the next generation of agentic AI interfaces across the Microsoft suite
  • Mentor engineers, drive technical decisions, and raise the bar on quality and developer experience

Requirements

  • 5+ years of software engineering experience, with significant depth in Office Add-in development using OfficeJS
  • Experience building and shipping a production Office Add-in product, ideally one used at enterprise scale
  • Strong proficiency in JavaScript/TypeScript, HTML, and CSS
  • Deep understanding of Office Add-in architecture, requirement sets, manifest configuration, and cross-platform considerations
  • Experience with React or similar modern frontend frameworks
  • Track record of shipping highly intuitive products with strong attention to detail
  • Familiarity with Microsoft Office Add-in guidelines and AppSource submission process is a plus

Nice to have

  • Experience with Outlook Add-ins or other Microsoft 365 integrations (SharePoint, Teams)
  • Background in legal tech or enterprise SaaS
  • Experience building products that integrate with AI/LLM capabilities

What we offer

  • Comprehensive health, dental and vision coverage
  • retirement benefits (401k match up to 4%)
  • flexible PTO
  • equity plan
  • bonus

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