Software Engineer (.NET)

The roleWe are looking for a talented software .NET developer with extensive experience in .NET/C# to join our team. In this role, you’ll design, develop, and maintain our Definely products—from rich WPF-based desktop applications to resilient backend services. This is an opportunity to lead by example, mentor junior team members, and drive the technical excellence that defines our suite of products.‍Key ResponsibilitiesApplication DevelopmentArchitect, design, and implement rich desktop applications using WPF.Leverage modern UI design principles and patterns (such as MVVM) to ensure clean, maintainable, and scalable code.Build and maintain robust backend services, APIs, and libraries using .NET/C#.Technical Leadership & CollaborationParticipate in design and code reviews to ensure high-quality, maintainable solutions.Collaborate closely with product managers, designers, and other engineers to align on requirements and deliver innovative features.Provide technical mentorship and guidance to less experienced developers.Quality & Best PracticesWrite clean, well-documented code accompanied by unit and integration tests.Continuously improve application performance, scalability, and security.Advocate for and implement best practices and modern software development methodologies (e.g., Agile/Scrum).Problem Solving & InnovationTroubleshoot and resolve complex technical issues as they arise.Contribute to architectural discussions and help drive the evolution of our technology stack.‍About you5+ years of professional software development with a focus on .NET/C#.Proven track record in building WPF desktop applications with a keen eye for design and usability.Solid experience designing and implementing backend services.Proficiency with both .NET Framework and .NET Core.Strong understanding of object-oriented design, design patterns, and SOLID principles.Deep expertise in WPF, including XAML, data binding, custom controls, and UI animations.Comprehensive knowledge of UI/UX design principles and best practices, ensuring that applications are both functional and visually appealing.Experience working with relational databases (e.g., PostgreSQL).Familiarity with RESTful API design and integration.Excellent problem-solving abilities and attention to detail.Strong communication and collaboration skills.Ability to work effectively in a fast-paced, agile environment.Experience building VSTO Word Add-On is a plus.Experience with cloud platforms such as AWS and Azure.Knowledge of CI/CD pipelines and DevOps best practices.Familiarity with additional front-end technologies or modern UI frameworks.Prior experience in a product-focused or startup environment is a plus.‍About DefinelyAt 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 offerCompetitive SalaryWe offer a highly competitive salary that reflects your skills, experience, and contributions.Impact & GrowthJoin a fast-growing startup where your ideas matter; experiment, innovate, and see your work come to life.High-Performance CultureWork in a truly meritocratic environment alongside ambitious, driven professionals who push each other to excel.Prestigious Partnerships‍Collaborate with some of the world’s top law firms, financial institutions, and multinational corporations.Prime London Location & Hybrid Flexibility‍Enjoy 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 & Development‍Access top-tier training, mentorship, and continuous support to advance your career.Time Off‍Enjoy 25 days of holiday per year, plus UK bank holidays, to recharge and unwind.Pension Plan‍Secure your future with our competitive pension scheme.Private Healthcare‍Access to Vitality healthcare, including dental and optical. Flexible Working‍Work in a way that suits your lifestyle, with the freedom to balance professional and personal priorities.Enhanced Parental LeaveWe support working parents with generous parental leave policies that go far beyond statutory requirements.Cycle to Work Scheme‍Save on a new bike and accessories while promoting a healthier, more sustainable commute.Workplace Nursery Scheme‍Saving working parents lots of money through our salary sacrifice scheme!Top-Quality Equipment‍Get the tools you need to perform at your best, from cutting-edge tech to ergonomic office setups.‍Data Privacy Notice‍By 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.


THE ROLE
We are looking for a talented software .NET developer with extensive experience in .NET/C# to join our team. In this role, you’ll design, develop, and maintain our Definely products—from rich WPF-based desktop applications to resilient backend services. This is an opportunity to lead by example, mentor junior team members, and drive the technical excellence that defines our suite of products.

‍


KEY RESPONSIBILITIES
Application Development


- Architect, design, and implement rich desktop applications using WPF.
- Leverage modern UI design principles and patterns (such as MVVM) to ensure clean, maintainable, and scalable code.
- Build and maintain robust backend services, APIs, and libraries using .NET/C#.

Technical Leadership & Collaboration


- Participate in design and code reviews to ensure high-quality, maintainable solutions.
- Collaborate closely with product managers, designers, and other engineers to align on requirements and deliver innovative features.
- Provide technical mentorship and guidance to less experienced developers.

Quality & Best Practices


- Write clean, well-documented code accompanied by unit and integration tests.
- Continuously improve application performance, scalability, and security.
- Advocate for and implement best practices and modern software development methodologies (e.g., Agile/Scrum).

Problem Solving & Innovation


- Troubleshoot and resolve complex technical issues as they arise.
- Contribute to architectural discussions and help drive the evolution of our technology stack.

‍


ABOUT YOU

- 5+ years of professional software development with a focus on .NET/C#.
- Proven track record in building WPF desktop applications with a keen eye for design and usability.
- Solid experience designing and implementing backend services.
- Proficiency with both .NET Framework and .NET Core.
- Strong understanding of object-oriented design, design patterns, and SOLID principles.
- Deep expertise in WPF, including XAML, data binding, custom controls, and UI animations.
- Comprehensive knowledge of UI/UX design principles and best practices, ensuring that applications are both functional and visually appealing.
- Experience working with relational databases (e.g., PostgreSQL).
- Familiarity with RESTful API design and integration.
- Excellent problem-solving abilities and attention to detail.
- Strong communication and collaboration skills.
- Ability to work effectively in a fast-paced, agile environment.
- Experience building VSTO Word Add-On is a plus.
- Experience with cloud platforms such as AWS and Azure.
- Knowledge of CI/CD pipelines and DevOps best practices.
- Familiarity with additional front-end technologies or modern UI frameworks.
- Prior experience in a product-focused or startup environment is a plus.



‍


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 Notice‍By 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.

Locationremote, London, United KingdomEmployment TypeFull timeLocation TypeHybridDepartmentTechnology

Locationremote, London, United Kingdom


LOCATION
remote, London, United Kingdom
Employment TypeFull time


EMPLOYMENT TYPE
Full time
Location TypeHybrid


LOCATION TYPE
Hybrid
DepartmentTechnology


DEPARTMENT
Technology