Staff Full Stack Engineer - Sell Side Engine

This position is listed on behalf of a partner company, who manages all applications and next steps. Our partner is looking for a Staff Full Stack Engineer - Sell Side Engine based in Spain.

• This is a highly hands-on Staff Engineer role focused on solving complex technical problems within a rapidly scaling energy technology environment.
• You will join a small, high-impact product squad responsible for rebuilding the systems that support renewable energy origination, contracting, onboarding, and growth.
• The role combines deep backend and systems engineering with the flexibility to contribute to frontend development when needed.
• You will make architecture-level decisions across integration-heavy systems, working with pricing, data, billing, and risk platforms.
• A major focus will be turning manual and error-prone commercial processes into scalable, automated products that can support new business categories.
• You will work with significant autonomy, operating within ambiguity and taking complex problems from definition through production delivery.
• This is an opportunity for an exceptional engineer to directly influence critical market infrastructure while helping build the technology behind a more transparent and efficient energy ecosystem.