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., * Develop, deploy, and maintain production-grade software systems across frontend and backend

• Work closely with software, DevOps, ML, and research teams to industrialize core technologies
• Contribute to high-impact projects for large enterprise and government customers
• Take ownership of system design, APIs, and application workflows
• Maintain high engineering standards through testing, documentation, and clean code practices

• Bachelor's degree or higher in Computer Science, Engineering, or equivalent industry experience
• Strong expertise in Python; additional experience with Rust or C/C++ is a plus
• Experience level aligned with junior (1-2 years), mid (3+ years), or senior (5+ years) profiles
• Experience in frontend and backend development
• Proficiency with TypeScript and frameworks such as Flask or FastAPI
• Experience deploying software in cloud environments such as AWS
• Strong knowledge of Git and CI/CD pipelines
• Excellent communication skills and ability to collaborate across disciplines

Preferred 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 Spark
• Experience working in cross-functional teams and designing scalable software architectures

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 qualifications
• Signing bonus upon joining and a retention bonus at contract completion
• Relocation support if applicable
• Fixed-term contract until June 2026
• Hybrid working model with flexible hours
• International, highly technical environment within a fast-scaling Series B company