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- Tasks: Design and build sophisticated React applications for legal professionals worldwide.
- Company: Join a forward-thinking tech company with a collaborative culture.
- Benefits: Competitive salary, equity, flexible working, and generous holiday allowance.
- Why this job: Shape the future of tech while mentoring others and tackling exciting challenges.
- Qualifications: 4+ years in React development and strong collaboration skills.
- Other info: Enjoy a dynamic environment with opportunities for growth and innovation.
The predicted salary is between 36000 - 60000 £ per year.
Location: London
Employment Type: Full time
Location Type: Hybrid
Department: Technology
About the role: We’re looking for a Senior Engineer with strong technical depth and a passion for building exceptional user experiences. You’ll 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’ll 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’ll 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’ll 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’ll 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
Senior Software Engineer in City of London employer: Cornerstone VC
Contact Detail:
Cornerstone VC Recruiting Team
StudySmarter Expert Advice 🤫
We think this is how you could land Senior Software Engineer in City of London
✨Tip Number 1
Network like a pro! Reach out to your connections in the tech industry, especially those who work at companies you're interested in. A friendly chat can lead to referrals, which can significantly boost your chances of landing that Senior Software Engineer role.
✨Tip Number 2
Show off your skills! Create a portfolio showcasing your best React applications and any projects that highlight your experience with Microsoft Office integrations. This will give potential employers a taste of what you can bring to the table.
✨Tip Number 3
Prepare for technical interviews by brushing up on your coding skills and understanding performance optimisation techniques. Practice common coding challenges and be ready to discuss your past projects and how you've tackled complex problems.
✨Tip Number 4
Don’t forget to apply through our website! It’s the best way to ensure your application gets seen by the right people. Plus, it shows your enthusiasm for joining our team at StudySmarter!
We think you need these skills to ace Senior Software Engineer in City of London
Some tips for your application 🫡
Tailor Your CV: Make sure your CV highlights your experience with React and Microsoft Office integrations. We want to see how your skills align with the role, so don’t be shy about showcasing relevant projects!
Craft a Compelling Cover Letter: Your cover letter is your chance to shine! Share your passion for building user experiences and how you’ve tackled complex technical challenges in the past. Let us know why you’re excited about joining our team!
Showcase Your Collaboration Skills: Since we value teamwork, mention any experiences where you’ve collaborated with product and design teams. Highlight how you’ve mentored others or contributed to architectural discussions – we love a team player!
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’s super easy!
How to prepare for a job interview at Cornerstone VC
✨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 your knowledge of integrating with Microsoft Office products, especially Office.js, as this will likely come up during technical discussions.
✨Showcase Your Problem-Solving Skills
Be prepared to discuss complex technical challenges you've faced in the past. Think about specific examples where you’ve implemented performance optimisations or automated workflows, as these experiences will demonstrate your ability to troubleshoot and improve processes.
✨Collaboration is Key
Since the role involves working closely with product and design teams, be ready to talk about your experience collaborating with others. Highlight instances where you’ve mentored team members or contributed to architectural discussions, showcasing your leadership and teamwork skills.
✨Ask Insightful Questions
Prepare thoughtful questions about the company’s tech stack evolution, team dynamics, or their approach to user experience. This not only shows your interest in the role but also gives you a chance to assess if the company culture aligns with your values.
