Job Title: Full Stack AI Engineer

Company Name: Definely

Job Details: HybridFull,Time

Job Url: https://hiring.cafe/viewjob/9wvnloru59ubcw63

Job Description: Posted 23h agoFull Stack AI Engineer@ DefinelyView All JobsWebsiteLondon, England, United KingdomHybridFull TimeResponsibilities:Designing LLM agents, Building scalable systems, Integrating AI across full stackRequirements Summary:Senior full-stack AI engineer with production ML/LLM experience, strong Python and .NET skills, front-end and back-end capabilities, and cloud/Kubernetes knowledge.Technical Tools Mentioned:Python, .NET, C#, JavaScript, Kubernetes, AWS, GCP, LLMs, AI tools (Claude Code, Cursor, Codex)
About the roleWe are looking for a Senior Full Stack AI Engineer to join our AI team and help us build cutting-edge legal solutions for some of the world’s largest law firms.In this role, you will leverage your deep expertise in machine learning, natural language processing, large language model (LLM) agents, and programming, alongside full stack development, to push the boundaries of legal technology. You’ll be collaborating closely with ML engineers, software engineers, and domain experts to integrate advanced NLP techniques into our products and deliver end-to-end user-facing experiences.You have strong front-end (JS) and back-end (Python, .NET, etc.) development skills, and are comfortable working across both backend systems and user-facing interfaces, taking ownership of features from idea to production.It’s a role for someone who is comfortable working in a fast-paced, sometimes ambiguous environment, enjoys solving complex problems, and wants to have a direct impact on product and technical direction.What you'll do:Designing and deploying LLM agents and agentic architectures to automate complex legal workflowsBuilding and maintaining scalable, production-grade systems that are reliable, secure, maintainable, and observableWorking across the full stack to integrate AI capabilities into user-facing productsOwning features end-to-end, from prototyping through to production and iterationCollaborating closely with ML engineers, software engineers, and domain experts to bring AI-driven features into the productContributing to the direction of our AI initiatives by staying up to date with developments in NLP, machine learning, agentic systems, and full stack technologiesWhat you'll bring:Experience working with LLMs in production and integrating ML/LLM components into product systems (streaming, async jobs, state, caching, evaluation)Strong Python (ideally .NET, C# as well) backend development skills, with experience building APIs and services, and comfort contributing to front-end applicationsA solid understanding of software development principles, including design patterns, data structures, and algorithmsExperience using AI tools (such as Claude Code, Cursor, Codex) and interest in leveraging them to improve engineering efficiencyStrong communication skills, with the ability to explain complex technical concepts clearly to both technical and non-technical audiencesA strong appreciation of Kubernetes, Infrastructure as Code, GitOps, CI/CD practices, and cloud infrastructure (AWS or GCP)Comfort working in a fast-paced, sometimes ambiguous start-up environment with changing prioritiesWhat we can offer you:💰 Competitive salary & annual bonus📈Share options🎉 Quarterly team socials & annual company offsite🏠 Hybrid working + 🌍 1 month “work from anywhere”🏖️ 25 days holiday + bank holidays🎂 Take your birthday off📚 £750 annual learning & development budget🩺 Private healthcare (incl. dental & optical)👶 Enhanced parental leave🚲 Additional perks: Cycle to Work, Workplace Nursery salary sacrifice scheme, and top-quality equipmentAbout DefinelyDefinely is revolutionising how legal professionals access and understand information in complex documents. Our LegalTech solutions integrate directly into legal workflows, enabling teams to draft, review, and interpret contracts more efficiently, without breaking focus.We’re proud to be recognised among the Top 25 in Deloitte’s UK Technology Fast 50 and backed by Revaia, Microsoft, Google, and Octopus Ventures. Trusted by top firms like A&O Shearman, Dentons, Deloitte, and Barclays, we’re building tools that empower legal teams to work smarter and reduce risk.At Definely, you’ll be part of a mission-driven, collaborative, and ambitious team committed to innovation and growth.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 people@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.