Senior Software Engineer (Full Stack)

and modern frontend tooling Develop robust backend services in JavaScript (and ideally contribute to existing .NET services) Design modular, scalable architectures that integrate with OJS, AWS, and Azure cloud platforms Optimise system performance and ensure seamless interaction between new and legacy components Lead code and architecture reviews, mentor other engineers, and promote technical excellence Collaborate closely with product and design teams to deliver impactful, user focused features Champion engineering best practices (SOLID, DRY, TDD) and leverage AI assisted tools to accelerate delivery What you'll bring: 4+ years of professional experience as a Full Stack JavaScript Engineer A degree in computer science or a related engineering discipline Deep expertise in React, JavaScript/TypeScript, HTML5, and CSS3 Strong backend development experience using JavaScript (and ideally familiarity with .NET) Proven ability to architect, build, and scale modern web applications Experience, parental leave Additional perks: Cycle to Work, Workplace Nursery salary sacrifice scheme, and top-quality equipment 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.

integrating with RESTful and GraphQL APIs Familiarity with relational databases such as PostgreSQL and modern DevOps workflows Strong understanding of Git, CI/CD, and agile delivery processes Excellent communication and collaboration skills; you thrive in a fast paced, product driven environment We'll be lucky if you have: Experience at high-growth startups or AI-driven product companies Prior work in LegalTech, AI, or document-focused workflows Experience with cloud-native architectures or microservices Familiarity with modern cross-platform frameworks like .NET MAUI, Blazor, or Electron A track record of mentoring engineers or driving architectural transformations 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

About the role We are looking for an exceptional Senior Full Stack Engineer to to reshape how legal professionals access and understand complex documents. In this role, you will drive the design, development, and optimisation of our next generation LegalTech products built on OJS and modern JavaScript frameworks. You will work across both the frontend and backend, building rich, performant user experiences and scalable services, while also leveraging knowledge of .NET principles to enhance and extend our existing backend systems. While we are gradually transitioning away from a .NET-heavy stack, we're looking for engineers who can contribute to that journey; people who love modern JavaScript development and are equally comfortable diving into existing .NET code when needed. You'll also shape architecture and define engineering best practices that enable performance, maintainability, and innovation. What you'll do: Build and scale high performance web applications using React, TypeScript