Alignerr Corp. is seeking Back End Developers in Madrid to design, build, and optimize the server-side systems and APIs that power AI products — from data pipelines and model-serving infrastructure to scalable microservices that handle real-world traffic at scale. This is a fully remote, versátil contract role. Whether you're a seasoned engineer looking for meaningful project work or a strong developer ready to apply your skills to AI-adjacent infrastructure, this is your chance to build things