Summary
Txema León is a seasoned backend developer and tech lead based in Madrid with 11 years of professional experience and 6+ years focused on Node.js, DDD, hexagonal architecture and TDD. He has led teams and shaped architectural visions for logistics and AI-infused platforms, implementing microservices, event-driven systems and ML pipelines in production. Comfortable across Python and TypeScript, he has built scalable services on AWS (ECS, Lambda, SQS), integrated models with Whisper and XGBoost, and improved observability and developer experience through Sentry, Elastic APM and CI/CD automation. His work spans GraphQL API design and React/Next.js admin interfaces, as well as large-scale SIM/eSIM automation systems that manage tens of thousands of devices. Known for fostering technical excellence via mentorship, code reviews and documentation, he blends hands-on implementation with strategic architecture. He often combines practical product needs with advanced patterns (CQRS, DDD) to keep systems maintainable under rapid growth.
11 years of coding experience
14 years of employment as a software developer
Superior systems degree Superior Systems degree, Superior systems degree Superior Systems degree at IES Jovellanos
English