Job Description

The role

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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.


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Key responsibilities

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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

Technical Excellence

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.

Product Development

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

Quality & Documentation

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

Problem Solving & Innovation

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.

About you

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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.

Nice to have

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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.

About Definely

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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 LegalTech 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 Fast50 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 streamline their workflows and mitigate risks.

What we offer

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Competitive Salary

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

Impact & Growth

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

High-Performance Culture

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

Prestigious Partnerships?

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

Prime London Location & Hybrid Flexibility?

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!

Ongoing Learning & Development?

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

Time Off?

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

Pension Plan?

Secure your future with our competitive pension scheme.

Private Healthcare?

Access to Vitality healthcare, including dental and optical.
Flexible Working?

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

Enhanced Parental Leave

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

Cycle to Work Scheme?

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

Workplace Nursery Scheme?

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

Top-Quality Equipment?

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

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Data Privacy Notice

?By submitting your application, you agree that DEFEYENE LEGAL SOLUTIONS LIMITED ('Definely') may collect, process, and store your personal data as part of our recruitment process. We will use the information you provide to assess your qualifications for the role you are applying for and to communicate with you regarding your application.Your personal data will be stored for up to 12 months, after which it will be securely deleted unless we have another lawful basis to retain it. You have the right to access, correct, or request the deletion of your data at any time.For more details on how we handle your personal data and your rights, please send us an email to hr@definely.com and we will send your our privacy policy.

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If you have any concerns about how your data is being processed, please do not hesitate to contact us.