Backend Engineer | Rust & Python (m/f/d) | Legal AI Tech Start-up | Fully 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 Mission

As a Backend Engineer (m/f/d) you will play a vital role in developing Xayn’s privacy-first Legal AI solution helping professionals in the law research and advising domain.  You’ll build scalable, high-performance backend services while working closely with AI researchers and engineers to implement cutting-edge features and optimize system performance.

Your Team

The Tech team consists of around 10 individuals who work remotely or at the office in Berlin city center. Besides the development team, Xayn’s technical lead and an external consultant team handle various tasks related to providing Xayn’s development team with the necessary technical environment, ensuring the smooth operation and scalability of Xayn’s AI applications.  

Your Hiring Manager

Simon is heading the Tech Team (Development, Infrastructure). With more than 15 years of experience in software development, he is an advocate for product driven development, solving real life problems.

Your Responsibilities

• Develop and maintain scalable backend services using Rust, focusing on the core APIs that handle the heavy lifting for Xayn’s Noxtua platform
• Design, develop, and deploy secure and robust APIs with a focus on scalability, stability, and security for customer-facing services
• Manage Service and Tenant APIs using Python, including tenant creation, administration, and rights management for efficient customer operations
• Integrate AI libraries primarily in Python, implementing features close to LLMs (Large Language Models) and supporting AI-related API development
• Optimize algorithms and system performance to ensure speed, scalability, and overall system reliability across the platform
• Contribute to platform development with a focus on security and stability while designing and deploying new APIs for AI-driven features
• Collaborate with AI Engineers, DevOps, and Frontend Developers to implement solutions effectively and ensure seamless integration across teams

Our Tech Stack

• Programming: Rust, Python 
• Infrastructure: AWS, Docker, Kubernetes
• Database: e.g. PostgreSQL & Redis
• Version Control: GitHub
• CI/CD System: GitHub Actions
• Ticket System: Atlassian JIRA
• Documentation: Confluence
• Communication: Slack 
• Office Application: MS365 

Requirements

• Working Permission: EU
• Language: English (fluent)
• Strong proficiency in Rust and Python, with at least 2 years of Rust experience, including API development (e.g. with Tokio) and applying OpenAPI standards
• Expertise in backend development, including database integration (PostgreSQL), Docker containerization, and security practices like OAuth and secure coding
• Solid understanding of system architecture, with experience in microservices, scalable deployments using Kubernetes, and network architecture fundamentals
• Strong problem-solving and algorithmic skills, with a clean code approach and a focus on performance optimization
• Test-driven development mindset, with proven experience in extending Python projects, ensuring type-safe coding practices, and efficient collaboration within cross-functional teams

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.