About vLex
vLex is a global provider of legal intelligence and research solutions, offering access to one of the world's largest collections of legal information, including case law, legislation, regulations, and secondary sources. Leveraging cutting-edge artificial intelligence (AI) and data analytics, vLex empowers law firms, corporations, academic institutions, and government agencies with smarter, faster, and more comprehensive legal research tools.
Clio, the world’s leading provider of legal technology, has signed a definitive agreement to acquire vLex. This transaction is a major milestone in Clio’s platform evolution and a turning point for the future of legal work. It combines Clio’s legal operating system - trusted by more than 200,000 legal professionals - with vLex’s cutting-edge legal intelligence platform, which includes Vincent, its groundbreaking AI, built on the industry’s most comprehensive global legal database. Together, these platforms establish a new category of intelligent legal technology at the intersection of the business and practice of law, empowering legal professionals to seamlessly manage, research, and execute legal work within a unified system.
Learn more here.
As a Senior Backend Engineer, you will play a key role in building and scaling the core services and infrastructure that power vLex products, and specially our flagship AI product, Vincent AI. You’ll work closely with research engineers, system engineers, frontend developers and the product team.
This role is ideal for someone who thrives on solving challenging technical problems, cares deeply about performance and reliability, and wants to make a global impact in the legal tech domain.
Scalable retrieval systems: Architect and optimize backend systems that support searching across billions of legal documents with high availability and low latency.
Workflow automation services: Build APIs and services that robustly enable. automation of complex legal tasks, ensuring traceability and security, using distributed computed orchestration solutions such as temporal.io or cadence.
Real time collaboration: Develop the backend component for a solution that supports real time collaboration between users and between users and AI agents.
As a Senior Engineer, Backend, you will:
Lead the design, development, and optimization of backend services and APIs that support vLex’s products at scale.
Drive technical decisions and ensure best practices for performance, reliability, security, and maintainability.
Collaborate with cross-functional teams—including product managers, research engineers, and legal engineers—to translate business needs into technical solutions.
Build and maintain large-scale distributed systems, ensuring robustness and efficiency in production.
Contribute to strategic planning by identifying opportunities to improve scalability, architecture, and developer productivity.
Participate in code reviews, mentoring, and technical discussions to raise the bar for engineering excellence.
Help improve monitoring, observability, and operational processes to support 24/7 production services.
Document and communicate architectural decisions, implementation details, and system designs.
Qualifications, Experience and Skills
Bachelor’s or Master’s degree in Computer Science, Engineering, or a related field (or equivalent experience).
5+ years of professional experience in backend engineering.
Proficiency in Python
Hands-on experience with cloud environments (AWS, GCP, or Azure) and containerization (Docker, Kubernetes).
Solid understanding of system design, scalability, and performance optimization.
Experience integrating or supporting ML/AI services in production is a strong plus.
Excellent communication skills and ability to collaborate effectively in cross-functional teams.
A strong desire to continuously learn, challenge yourself, and refine your craft.
An interest in how technology transforms the legal industry is highly valuable.
At vLex, we care about your well-being. Our benefits package is designed to support your health and help you maintain a fulfilling balance between your professional and personal life.
Dynamic and collaborative work environment
Flexible working arrangements
Commitment to mental health and overall well-being
Career development and learning opportunities
Inclusive and multicultural teams
Creativity-driven culture and innovative projects
Team-building activities and community events
Access to state-of-the-art legal technology
International work environment with exposure to global markets.
vLex is an equal opportunity employer. We celebrate diversity and are committed to creating an inclusive environment for all employees.
By applying to this job offer, you agree that your data may be transferred to other companies within the group, namely: VCALL SERVICES, S.L. and FELIX SPAIN BIDCO, S.L. Please find the applicable Privacy Policy here: https://vlex.es/privacy