As our client's data business grows, the Data Division's AI Platform Services team is building applications and platforms for customers using data in AI and ML projects. As a Senior Software Engineer, Backend, you will build the APIs, services, integrations, and data-access systems behind those products. You will help make complex data workflows reliable, secure, observable, and scalable for customer-facing and internal applications. Responsibilities * Build and evolve reliable backend services, GraphQL and REST APIs, and integrations that power customer-facing and internal applications. * Design and maintain clear API contracts and data-access patterns for application workflows. * Work with relational and NoSQL databases to deliver dependable, scalable application behavior. * Build asynchronous and event-driven processing where it improves product workflows and system resilience. * Improve testing, observability, performance, and operational readiness for the systems you own. * Own substantial work from implementation through deployment, production support,



and incremental improvement. * Partner with frontend engineers, product, design, and data teams to deliver useful product capabilities. * Contribute to code reviews, shared engineering practices, and peer learning. Requirements * Experience making significant contributions to production backend systems, APIs, or services. * Agentic development is a core part of how you work: you use it deliberately to explore, build, and deliver projects, and can articulate the practices that make it effective. * Strong experience with TypeScript and Python for server-side application development. * Experience designing, building, and integrating GraphQL and REST APIs. * Experience with relational databases such as PostgreSQL or MySQL, and NoSQL systems such as DynamoDB or Cloud Firestore. * Experience building and operating serverless functions with AWS Lambda or Cloud Run functions. * Experience with automated testing, debuggi

📌 Senior Python Engineer (Comunidad de Madrid)
🏢 NIX
📍 Comunidad de Madrid