The role
We’re looking for exceptionally talented Full Stack Engineers with deep expertise in .NET/C# to join our growing team.
In this role, you’ll own the full software development lifecycle—from planning and designing to developing, testing, and maintaining our Definely products. You’ll work on rich WPF-based desktop applications, robust backend services, and cloud-integrated solutions that power our global LegalTech platform.
This is a chance to lead technical initiatives, mentor junior engineers, and drive the technical excellence that defines our product suite.
Key responsibilities
Application Development
Architect, design, and implement rich desktop applications using WPF, leveraging modern design patterns like MVVM for clean, scalable code.
Build and maintain resilient backend services, APIs, and libraries using .NET (Framework & Core).
Integrate with cloud platforms (AWS, Azure) to deliver scalable solutions.
Technical Leadership & Collaboration
Lead design and code reviews to ensure high-quality, maintainable solutions.
Collaborate with product managers, designers, and engineers to deliver innovative features.
Provide technical mentorship to less experienced developers.
Quality & Best Practices
Write clean, well-documented code with comprehensive unit, integration, and end-to-end tests, supporting rapid release cycles.
Continuously improve performance, scalability, and security.
Advocate for and implement modern engineering practices (Agile/Scrum, CI/CD).
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
5+ years of professional, product-focused full stack development experience with .NET/C#.
Proven track record of building Windows desktop applications with a strong focus on UI/UX.
Deep expertise in WPF, including XAML, data binding, custom controls, and UI animations.
Solid experience designing and implementing backend services.
Proficiency with .NET Framework & .NET Core.
Strong knowledge of object-oriented design, design patterns, and SOLID principles.
Comprehensive understanding of UI/UX principles, ensuring applications are both functional and visually appealing.
Hands-on experience with Visual Studio and/or JetBrains Rider, along with ReSharper for refactoring and code quality.
Familiarity with AI-assisted coding tools (e.g., GitHub Copilot, Claude Code) to accelerate development.
Experience with relational databases (e.g., PostgreSQL) and RESTful APIs.
Understanding of cloud platforms (AWS, Azure).
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
Experience in product-focused or startup environments.
Prior experience building VSTO Word Add-Ins.
Exposure to other AI-powered developer tools and workflows.
Knowledge of performance profiling and optimization for Windows apps.
Familiarity with modern cross-platform frameworks like .NET MAUI, Blazor, or Avalonia.
Understanding of cloud integration and distributed services.
About Definely
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
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.
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.
If you have any concerns about how your data is being processed, please do not hesitate to contact us.