Find a job 
Featured Companies 
Featured Universities 
For Companies At a Glance
- Tasks: Design and build sophisticated React applications for legal professionals worldwide.
- Company: Join Definely, a pioneering LegalTech company transforming legal workflows.
- Benefits: Competitive salary, equity, hybrid work, and generous holiday allowance.
- Why this job: Shape the future of legal tech while mentoring others and driving innovation.
- Qualifications: 4+ years in React, strong coding skills, and experience with Microsoft Office integrations.
- Other info: Enjoy a supportive culture with excellent career growth and learning opportunities.
The predicted salary is between 30000 - 50000 £ per year.
We are looking for a Senior Engineer with strong technical depth and a passion for building exceptional user experiences. You will 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, you will act as a technical expert and a trusted partner helping to guide best practices, influence decisions, and mentor others through collaboration and example.
What you will do:
- Design and build sophisticated React applications integrating with Microsoft Word, M365, and other Office products using Office.js.
- 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 you will 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 Office.js 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.
We will 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
At Definely, we are 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. We create a supportive environment driven by a shared commitment to connection, growth and success.
By submitting your application, you agree that Definely may collect, process, and store your personal data as part of our recruitment process. 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, please contact hr@definely.com.
Senior Software Engineer in London employer: Definely
Contact Detail:
Definely Recruiting Team
StudySmarter Expert Advice 🤫
We think this is how you could land Senior Software Engineer in London
✨Tip Number 1
Network like a pro! Reach out to your connections in the industry, especially those who work at Definely or similar companies. A friendly chat can sometimes lead to insider info about job openings or even a referral.
✨Tip Number 2
Show off your skills! Create a portfolio showcasing your best React projects. Make sure to highlight any experience with Microsoft Office integrations and performance optimisation techniques. This will give you an edge when chatting with potential employers.
✨Tip Number 3
Prepare for interviews by brushing up on common technical questions related to React and TypeScript. Practice coding challenges and be ready to discuss your past projects and how you tackled complex problems. Confidence is key!
✨Tip Number 4
Don’t forget to apply through our website! It’s the best way to ensure your application gets seen. Plus, we love seeing candidates who take the initiative to connect directly with us.
We think you need these skills to ace Senior Software Engineer in London
Some tips for your application 🫡
Tailor Your CV: Make sure your CV is tailored to the Senior Software Engineer role. Highlight your experience with React, TypeScript, and any relevant projects that showcase your skills in building user-focused applications.
Craft a Compelling Cover Letter: Your cover letter is your chance to shine! Use it to explain why you're passionate about the role and how your background aligns with our mission at Definely. Don’t forget to mention your experience with Microsoft Office integrations!
Showcase Your Collaboration Skills: Since collaboration is key in this role, be sure to include examples of how you've worked with product and design teams in the past. We love seeing how you’ve contributed to team goals and mentored others!
Apply Through Our Website: We encourage you to apply directly through our website. It’s the best way for us to receive your application and ensures you’re considered for the role. Plus, it shows you’re keen on joining our team!
How to prepare for a job interview at Definely
✨Know Your Tech Stack
Make sure you’re well-versed in React, TypeScript, and the other technologies mentioned in the job description. Brush up on performance optimisation techniques like memoisation and code splitting, as these will likely come up during technical discussions.
✨Showcase Your Collaboration Skills
Since this role involves working closely with product and design teams, be prepared to discuss your past experiences collaborating with others. Share specific examples of how you’ve contributed to team goals and mentored junior developers.
✨Prepare for Architectural Discussions
Think about how you would approach architectural decisions and improvements. Be ready to share your thoughts on evolving tech stacks and how you’ve influenced best practices in previous roles.
✨Demonstrate Problem-Solving Abilities
Expect to tackle some complex technical challenges during the interview. Prepare to discuss how you’ve approached troubleshooting in the past and any automation or AI-assisted workflows you’ve implemented to drive continuous improvement.
