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Babel Profiles Logo Babel Profiles · IT - Software Development

Ai / Llm Senior Fullstack Engineer

Spain 65000.00 - 78000.00 EUR / Year · Job Posted July 03, 2026
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Job Description

We are partnering with a global leader in the Legal Tech Sector that is reshaping the future of the industry! By integrating advanced AI and data analytics into one of the most comprehensive legal databases worldwide, our client enables professionals to work smarter and faster at scale. This is a unique opportunity to bring your expertise to a mission-driven, fast-moving organization with a real impact on the market. As a Senior Full Stack Engineer, you will play a key role in building and scaling the core features that legal professionals around the world rely on daily. This is a Python-first position where your primary focus will be designing and implementing robust backend services. On the frontend, it is highly flexible: the client is welcome engineers with solid experience in modern technologies like React, JavaScript, or TypeScript, as long as you are comfortable contributing to a modern user experience. It’s the perfect match if you love backend architecture but want to maintain a strong grip on full-stack development. Our client operates on a hybrid basis for those living in Madrid or Barcelona, leveraging their local hubs. However, if you are based anywhere else in Spain, they offer the flexibility of working fully remote.

Job Responsibility

  • Backend Development & Architecture: Design and build scalable backend systems and APIs using Python and Flask, ensuring our distributed services stay fast, reliable, and easy to maintain as we grow
  • End-to-End Collaboration: Work closely with product managers, designers, and frontend devs to launch solid features, helping out with frontend integration when needed without losing your primary focus on the backend
  • Integrations & Ecosystem: Handle seamless connections between our core backend, headless CMS platforms (like Strapi), internal systems, and third-party services
  • Engineering Excellence & Infrastructure: Keep code quality high through automated testing, meaningful code reviews, and better deployment workflows using Docker, Git, and CI/CD pipelines
  • Performance & Cloud Scaling: Own system monitoring, troubleshoot production bottlenecks, and improve security and scalability across our cloud and containerized environments

Requirements

  • 5+ years of experience in Python backend and full-stack roles, with a proven track record of shipping production-ready code
  • Deep knowledge of Python and a strong background designing REST APIs and working within microservices architectures
  • Solid frontend skills: comfort working with JavaScript/TypeScript and at least one modern framework or library (like React, Angular, Lit, or similar)
  • Hands-on with DevOps basics: daily use of Docker, Git, and setting up or maintaining CI/CD pipelines
  • Performance-oriented mindset: good handling of Unix systems, debugging tools, and performance metrics (like Core Web Vitals, Lighthouse, or DevTools)
  • Full professional level of English

Nice to have

  • Experience working with Web Components and headless CMS platforms like Strapi
  • Familiarity with Next.js, SSR, or SSG rendering strategies
  • Previous background in LegalTech or regulatory technology sectors

What we offer

  • Competitive Salary of EUR 65,000 -78,000K
  • Hybrid model with lots of flexibility
  • Collaborative, multicultural team environment
  • Mental health and well-being support
  • Career growth, leadership mentoring, and ownership of core systems
  • Projects with real-world impact in the legal tech space
  • Access to innovative tools and a fast-paced, mission-driven environment
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