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This is a fully remote position, open to candidates based in Spain.
Role Title: Senior Software Engineer
Role Type: Contractor (~15 hrs a week)
Location: Remote
the company is selecting Software Engineers to support a customer's innovative project. Your work will shape how models learn, reason, and perform through high-quality, real-world input. As an expert you will be creating Reinforcement Learning Environments which test and AI model's ability to solve complex software engineering problems related to fixing code, creating features, refactoring code and optimizing performance. On this project, you will create realistic, interesting,



and extremely challenging coding tasks for frontier AI models using your favourite repositories
You will design problems that require strong software engineering skills, such as tracking down subtle bugs, building non-trivial features, or improving performance.
Python3, Java, Rust, Go, C++, or TypeScript.
Deep understanding of algorithms, data structures, and software engineering principles.
Track record of delivering high-impact features from conception through delivery within cross-functional projects.
experts are paid per task that meets the project specifications.

📌 Software Engineer* (Madrid)
🏢 RemoteJobsOne
📍 Madrid