Back-End Developer (Full time, Barcelona)

Key responsibilities

• Design and implement APIs powering Origin, Sentinel, and Nexus

• Develop scalable microservices and data pipelines

• Ensure high performance, security, and reliability of back-end systems

• Collaborate with front-end developers and data scientists

• Optimize databases and support real-time analytics delivery

Qualifications

• 3+ years as back-end developer (Python, Node.js, or Go)

• Strong knowledge of SQL / PostgreSQL, APIs, cloud infrastructure

• Familiarity with authentication, data security, and scaling architectures

• English fluency required

• Bonus: experience in SaaS, data products, or competitors (Prewave, Ecovadis, Greenly, top 5 strategy firms)

What we offer

• Full-time contract in Barcelona

• Competitive salary and equity package

• Chance to work on global-scale sovereignty solutions

• Collaborative environment in a mission-driven scale-up