Join to apply for the Engineering Lead (React) role at Definely

2 days ago Be among the first 25 applicants

Join to apply for the Engineering Lead (React) role at Definely

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.

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 React Team Lead to guide 2 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.



Key responsibilities:

Team Leadership & Mentorship

• Lead and inspire a team of React developers, fostering a collaborative environment where knowledge sharing is valued and encouraged
• Mentor team members, helping them grow their skills and advance their careers
• Promote best practices and maintain high code quality standards across the team
  
  

• Architect and develop sophisticated React applications that integrate with Microsoft Word, M365, Word Online, etc. using Office.js
• Write clean, efficient, and maintainable code
• Drive technical decisions and ensure scalable, performant solutions
• Think outside of the box to workaround any OfficeJS limitations.
  
  

• Collaborate closely with cross-functional teams to bring innovative features to life
• Create exceptional user interfaces that prioritize user experience and accessibility
• Continuously optimize application performance and responsiveness
  
  

• Establish robust testing and debugging processes to ensure high-quality, reliable software
• Maintain comprehensive documentation for code, APIs, and system architecture
• Implement security best practices to protect user data and ensure system integrity
  
  

• Troubleshoot and resolve complex technical challenges.
• Contribute to architectural discussions and drive the evolution of our tech stack.
• Improve 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, TypeScript, 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 optimize React apps (prevent useless re-rendering, memoization, 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.
  
  

• Knowledge of Microsoft Office Add-in guidelines and Office Store submission processes
• Background in LegalTech or professional services software
• Previous experience working with in-browser text editors, specially if you were part of optimization efforts to make the experience snappier.
• Experience in product-focused or startup environments.
• Exposure to other AI-powered developer tools and workflows.
  
  

• We offer a highly competitive salary that reflects your skills, experience, and contributions.
  
  

• Join a fast-growing startup where your ideas matter; experiment, innovate, and see your work come to life.
  
  

• Work in a truly meritocratic environment alongside ambitious, driven professionals who push each other to excel.
  
  

• Collaborate with some of the world’s top law firms, financial institutions, and multinational corporations.
  
  

• Enjoy a vibrant office in the heart of Aldgate with the option to work in a hybrid environment. We tend to come into the office 2-3 times a week, although you can come in more!
  
  

• Access top-tier training, mentorship, and continuous support to advance your career.
  
  

• Enjoy 25 days of holiday per year, plus UK bank holidays, to recharge and unwind.
  
  

• Secure your future with our competitive pension scheme.
  
  

• Access to Vitality healthcare, including dental and optical.
  
  

• Work in a way that suits your lifestyle, with the freedom to balance professional and personal priorities.
  
  

• We support working parents with generous parental leave policies that go far beyond statutory requirements.
  
  

• Save on a new bike and accessories while promoting a healthier, more sustainable commute.
  
  

• Saving working parents lots of money through our salary sacrifice scheme!
  
  

• Get the tools you need to perform at your best, from cutting-edge tech to ergonomic office setups.
  
  

Seniority level

• Seniority level

  Mid-Senior level

Employment type

• Employment type

  Full-time

Job function

• Job function

  Engineering and Information Technology

• Industries

  Software Development

Referrals increase your chances of interviewing at Definely by 2x

Get notified about new Lead Engineer jobs in London, England, United Kingdom.

Senior Innovation and Design Engineer, Worldwide Design and Engineering

London, England, United Kingdom 1 week ago

London, England, United Kingdom 1 month ago

Senior Solutions Design Engineer, Worldwide Design and Engineering

London, England, United Kingdom 2 weeks ago

London, England, United Kingdom 2 days ago

London, England, United Kingdom 5 days ago

London, England, United Kingdom 5 months ago

London, England, United Kingdom 1 month ago

Lead Software Engineer- Front-End Continuous Integration

London, England, United Kingdom 2 weeks ago

SENIOR MECHANICAL DESIGN ENGINEER (DATA CENTRES) - LONDON

London, England, United Kingdom 1 month ago

Senior Engineering Manager (FM & Workplace)

City Of London, England, United Kingdom £85,000.00-£95,000.00 6 days ago

London, England, United Kingdom 1 month ago

London, England, United Kingdom 1 month ago

London, England, United Kingdom 2 weeks ago

Manufacturing Principal Strategic Solution Engineer

London, England, United Kingdom 2 weeks ago

London, England, United Kingdom 1 day ago

Brentford, England, United Kingdom 1 week ago

Senior Mechanical Engineer - Building Services

London, England, United Kingdom 2 weeks ago

Manufacturing Principal Strategic Solution Engineer

London, England, United Kingdom 2 weeks ago

London, England, United Kingdom 2 weeks ago

Senior Manager – Research and Development Engineering

Paddington, England, United Kingdom 4 days ago

London, England, United Kingdom 6 days ago

London, England, United Kingdom 1 month ago

Principal Mechanical Engineer (Building Services)

Feltham, England, United Kingdom 1 month ago

Erith, England, United Kingdom 2 weeks ago

Senior Software Engineer QA - Entertainment Release

Harrow, England, United Kingdom 2 weeks ago

Senior Solutions Engineer (IDV) (Hybrid)

London, England, United Kingdom 2 months ago

Senior Mechanical Engineer (Mission Critical)

Greater London, England, United Kingdom 3 days ago

Associate Director Mechanical Engineering

Greater London, England, United Kingdom 2 weeks ago

Greater London, England, United Kingdom 2 weeks ago

Senior Manager – External Research and Development Engineering

Paddington, England, United Kingdom 5 days ago

London, England, United Kingdom 1 month ago

Enfield, England, United Kingdom 1 month ago

We’re unlocking community knowledge in a new way. Experts add insights directly into each article, started with the help of AI.