Senior Software Engineer (React)
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Job Summary
About the role
Were looking for a Senior Engineer with strong technical depth and a passion for building exceptional user experiences. Youll play a key role in shaping our front-end architecture collaborating closely with product and design teams and delivering scalable performant solutions used by legal professionals worldwide.
As a senior member of the team youll act as a technical expert and a trusted partner helping to guide best practices influence decisions and mentor others through collaboration and example.
What youll do:
Design and build sophisticated React applications integrating with Microsoft Word M365 and other Office products using .
Write clean scalable and maintainable code while driving performance and reliability.
Collaborate with product design and engineering teams to deliver user-focused accessible features.
Contribute to architectural discussions and help shape the evolution of our tech stack.
Mentor and support team members through knowledge sharing code reviews and best practice guidance.
Troubleshoot complex technical challenges and drive continuous improvement through automation and AI-assisted workflows.
Maintain high-quality standards with robust testing documentation and security practices.
What youll bring:
4 years of hands-on experience building production React applications.
Strong proficiency in React TypeScript JavaScript HTML CSS and modern web technologies.
Experience integrating with Microsoft Office especially and Word add-ins.
Familiarity with agentic coding assistants such as Claude Code or similar AI tools.
Excellent communication and collaboration skills in English.
Proven ability to work independently while contributing effectively to team goals.
Experience working successfully in hybrid or remote development environments.
Solid understanding of React performance optimisation (e.g. memoisation code splitting avoiding unnecessary re-renders).
Experience with Git version control best practices and CI/CD pipelines.
Well be lucky if you have:
Knowledge of Microsoft Office Add-in guidelines and Office Store submission processes.
Experience optimising in-browser text editors for speed and responsiveness.
Prior experience in product-focused or startup environments.
Exposure to AI-powered developer tools and automation workflows.
What we offer:
Competitive salary & annual bonus
Equity in Definely
Quarterly team socials & annual company offsite
Hybrid working (Tues & Thurs in-office) 1 month work from anywhere
25 days holiday bank holidays
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
About Definely
At Definely were 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 were 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 Deloittes prestigious UK Technology Fast50 in 2023 and backed by Microsoft Google and Octopus Ventures were 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.
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 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 more details on how we handle your personal data and your rights please send us an email to and we will send your our privacy policy.
If you have any concerns about how your data is being processed please do not hesitate to contact us.
Required Experience:
Senior IC
Key Skills
- Spring
- .NET
- C/C++
- Go
- React
- OOP
- C#
- AWS
- Data Structures
- Software Development
- Java
- Distributed Systems
