Frontend Engineer

About the role

Following our recent $30M Series B funding, we're expanding the team to accelerate development of our legal technology products that integrate with Microsoft products through Office.js.

We're looking for a Staff Engineer to guide two mid-senior React developers who will look to you for architectural guidance and technical direction.

As the technical side of the product Triad, your technical decisions will directly shape product direction.

• Lead and mentor a team of React developers, fostering collaboration, growth, and high coding standards
• Architect and develop complex React applications integrated with Microsoft Word, M365, and Word Online using Office.js
• Write clean, efficient, and maintainable code while ensuring scalable, high-performance solutions
• Collaborate with cross-functional teams to deliver innovative, user‑centric, and accessible features
• Optimise application performance and responsiveness, overcoming Office.js limitations creatively
• Establish strong testing, debugging, and documentation practices to maintain quality and reliability
• Implement security best practices to protect user data and maintain system integrity
• Troubleshoot complex technical issues and contribute to architectural decisions and tech‑stack evolution
• Enhance developer productivity through tooling, automation, and AI‑assisted coding

• Minimum 5 years of hands‑on, product‑focused experience with React development
• Proven leadership experience in software development teams
• Expert‑level proficiency in React, Type Script, JavaScript, HTML, CSS, and modern web technologies
• Strong experience with Microsoft Office integration, particularly Office.js and Word add‑ins
• Experience with agentic coding assistants such as Claude Code
• Excellent English communication skills, both written and verbal
• Demonstrated ability to work autonomously while providing clear direction to others
• Extensive experience working effectively in remote environments
• Passion for knowledge sharing and helping team members grow
• Know how to optimise React apps (prevent useless re‑rendering, memoisation, code splitting etc)
• Strong grasp of Git, version control best practices, and CI/CD pipelines.
• Excellent problem‑solving, communication, and collaboration skills.
• Ability to work effectively in a fast‑paced, agile environment.

• Previous experience working with in‑browser text editors, especially if you were part of optimisation efforts to make the experience snappier.
• Experience in product‑focused or startup environments.
• Exposure to other AI‑powered developer tools and workflows.

• 💰 Competitive salary + bonus
• 📈 Share options
• 🎉 Quarterly team socials & annual company offsite
• 🏡 Hybrid or remote working for this role
• 🌍 1 month “work from anywhere”
• 🏖️ 25 days holiday + bank holidays
• 🎂 Take your birthday off
• 📚 £750 annual learning & development budget
• 🩺 Private healthcare (incl. dental & optical)
• 👶 Enhanced parental leave
• 🚲 Additional perks:
  Cycle to Work, Workplace Nursery salary sacrifice scheme, and top‑quality equipment

At Definely, we’re on a mission to simplify the way legal professionals access and understand complex information in legal documents. Trusted by a global community of customers, our Legal Tech solutions integrate seamlessly into lawyers' daily workflows, making it easier to draft, review and navigate even the most complex contracts.

Our products provide instant access to essential information, enabling legal teams to review clauses and provisions in context, reduce risk and work more efficiently – all without disrupting their flow. At Definely, we’re dedicated to solving real challenges faced by legal professionals.

Joining Definely means becoming part of a forward‑thinking, collaborative team that prioritises innovation and people. We create a supportive environment driven by a shared commitment to connection, growth and success.

Recognised in the top 25 of Deloitte's prestigious UK Technology Fast
50 in 2023 and backed by Microsoft, Google and Octopus Ventures, we’re trusted by leading law firms and in‑house legal teams, including A&O Shearman, Dentons, Deloitte, and Barclays, to…