Full Stack Engineer/Agile Engineer

17 hours ago

London, United Kingdom Definely Full time

We’re looking for exceptionally talented Senior Full Stack Engineers with deep expertise in .NET/C# and WPF to join our growing team.
In this role, you will lead the full software development lifecycle: from design and implementation to testing, deployment, and ongoing support for our core LegalTech products. You’ll build and enhance rich WPF-based Windows desktop applications, scalable backend services, and cloud-integrated solutions. While the title includes “Full Stack,” this is not a traditional web development role; your focus will be on high-performance Windows applications and associated backend systems.

You’ll also play a key role in mentoring engineers, driving architectural improvements, and shaping engineering practices that ensure performance, maintainability, and innovation.

Application Development
NET Framework and .NET Core backend services, APIs, and libraries.
Implement modular application architectures to support scalability and maintainability.
Integrate with cloud platforms (AWS, Azure) for distributed computing and storage.

Quality & Best Practices
Champion best practices including SOLID, DRY, KISS, and test-driven development (TDD) to ensure code quality and building of new features.
Leverage AI-assisted tools (e.g., Apply performance and memory profiling techniques to ensure optimal runtime behaviour.
Tackle complex technical challenges across frontend and backend systems.
Design solutions with a strong emphasis on asynchronous programming, multithreading, and regular expression optimisation.
Continuously improve system performance and developer experience through innovation and tooling.

NET and C# across frontend and backend development.
~ Deep expertise in WPF, including XAML, data binding, custom controls, UI animations, and MVVM.
~ Strong experience building Windows desktop applications with attention to UI/UX design.
~ NET Framework and .NET Core.
~ Proven use of performance and memory profilers to debug and optimise applications.
~ Experience working with Visual Studio, JetBrains Rider, ReSharper, and modern DevOps pipelines.
~ Experience with AI-assisted coding tools (e.g., Familiar with relational databases (e.g., PostgreSQL) and RESTful APIs.
~ Comfortable in a fast-paced, agile environment.


Exposure to other AI-powered developer tools and workflows.
NET MAUI, Blazor, or Avalonia.
Understanding of cloud-native design, distributed systems, and DevOps best practices.

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.

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.

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