Senior UI Engineer (m/f/d) | Legal AI Tech Start-up | Full Remote

Job Description

The AI startup Xayn develops Noxtua, Europe’s first sovereign Legal AI. Noxtua helps lawyers analyze and draft legal documents and research legal questions while being legally competent and compliant. Hosted in the EU, Noxtua meets high standards of confidentiality in handling client data, professional secrecy (e.g. Section 203 German Criminal Code, Section 43e German Federal Code for Lawyers), and European data protection. Noxtua is powered by specialized proprietary AI models. The models are trained with high-quality legal data provided by the Legal AI Alliance which the tech startup Xayn initiated with the international business law firm CMS. This makes Noxtua the secure, independent, and specialized European Legal AI.

The Berlin-based AI company Xayn was born out of research at Oxford University and Imperial College London by Dr Leif-Nissen Lundbæk and Professor Michael Huth. Founded in 2017, Xayn’s academic vision remains, with a workforce comprised of approx. 30% PhDs. The startup has received investment funding of 19.5 million EURO from Global Brain Corporation, KDDI Open Innovation Fund, Earlybird, and Dominik Schiener.

Your Team

You will join our Tech Team of around 10 people, including: 3 Frontend Engineers led by Aurélien as well as 1 UI Designer, 4 AI Engineers as well as Backend and DevOps Engineers.  

Your Hiring Manager

Aurélien leads the Frontend Engineering Team. With extensive experience in software development and a hands-on, pragmatic leadership style, Aurélien values independent thinking and efficient solutions that drive real-world impact.

Your Responsibilities

• Develop UI Components: Using React, TypeScript, hooks, and responsive design
• Performance Optimization: Implement code splitting, lazy loading, and caching techniques
• Design Implementation: Pixel-perfect execution from Figma designs with Tailwind and animations
• Backend Integration: Connect APIs using RESTful services, integrating WASM solutions for encrypted communication
• Testing & Debugging: Write tests using Vitest ensuring clean, functional code
• End-to-End Responsibility: From design handover to backend integration, ensuring APIs fetch the right data
• Tech Stack Optimization: Streamline tooling, optimizing the codebase for better scalability & clean code best practices

Our Tech Stack

• Programming: React, Native JavaScript, TypeScript & Node.js
• Testing: e.g. VItest
• Ticket System: Atlassian JIRA
• Repository: Github
• CI/CD System: GitHub Actions
• Documentation: Confluence
• Communication: Slack 
• Office Application: MS365 

Requirements

• Working Permission: Germany
• Language: English (fluent)
• Full development lifecycle: Worked across the full development lifecycle, from design to backend connection with React, TypeScript, Hooks, and Context API, HTML5, CSS3, Web Components
• Backend integration experience: Node.js, API design, authentication mechanisms (JWT, OAuth & Keycloak)
• Delivery: Delivered results in evolving fast-paced startup environments
• Technical Debt: Optimized technical debt and implemented best coding practices in previous roles
• Optional: Familiarity with tools such as Webpack, Docker, Git, and CI/CD pipelines

Benefits

• Working hours: Flexible working hours: Full-time (32- 40h/week).
• Vacation: 26 days + December 24th & 31st off
• Remote: 100% remote work possible (given a German residence), other countries upon request  
• Discounts: e.g. Urban Sports Club Membership 
• Equipment: Laptop (Lenovo or Mac), second screen, keyboard etc.  

Sounds good? Then, we look forward to receiving your CV via our online application form.