Senior Software Engineer

We are hiring a Senior Software Engineer for a fixed-term contract ending in June 2026, based in Barcelona or Zaragoza with a hybrid working model.This role is with a leading European deep-tech company working at the intersection of AI, machine learning, and advanced computing. You will collaborate with world-class engineers and researchers to industrialize cutting-edge technologies and deliver solutions to large enterprise and public-sector customers.What is offered:Competitive annual salary, depending on experience and qualificationsSigning bonus upon joining and a retention bonus at contract completionRelocation support if applicableFixed-term contract until June 2026Hybrid working model with flexible hoursInternational, highly technical environment within a fast-scaling Series B companyRole responsibilities:Develop, deploy, and maintain production-grade software systems across frontend and backendWork closely with software, DevOps, ML, and research teams to industrialize core technologiesContribute to high-impact projects for large enterprise and government customersTake ownership of system design, APIs, and application workflowsMaintain high engineering standards through testing, documentation, and clean code practicesRequired experience:Bachelor's degree or higher in Computer Science, Engineering, or equivalent industry experienceStrong expertise in Python; additional experience with Rust or C/C++ is a plusExperience level aligned with junior (1–2 years), mid (3+ years), or senior (5+ years) profilesExperience in frontend and backend developmentProficiency with TypeScript and frameworks such as Flask or FastAPIExperience deploying software in cloud environments such as AWSStrong knowledge of Git and CI/CD pipelinesExcellent communication skills and ability to collaborate across disciplinesPreferred experience:Hands-on experience working with LLMs and related tools (HuggingFace, OpenAI APIs, vector databases)Experience with distributed systems or frameworks such as Ray or SparkExperience working in cross-functional teams and designing scalable software architecturesThis is a fixed-term contract role ending in June 2026.