Core Developer - Polkadot Runtime

This position is listed on behalf of a partner company, who manages all applications and next steps. Our partner is looking for a Core Developer - Polkadot Runtime based in Spain.

Join a remote-first global engineering team building foundational infrastructure for the next generation of the internet. In this role, you’ll work on core runtime functionality that underpins a resilient and decentralized blockchain ecosystem. You’ll design and implement cutting-edge protocols used by the network and by teams building applications on top of it. Your work will have a direct impact on core technology while giving you the opportunity to solve complex systems problems alongside experienced engineers. You’ll contribute to open-source projects and collaborate in an environment built around transparency, peer review, and technical excellence. This is an opportunity to help shape decentralized technology while working flexibly with a globally distributed team.

Accountabilities

• Design and implement cutting-edge protocols and core runtime functionality that support a decentralized blockchain ecosystem.
• Build and maintain foundational protocol components used by the network and by teams developing applications on top of it.
• Develop tooling, abstractions, and infrastructure that make it easier for developers to build reliable and innovative decentralized applications.
• Collaborate closely with product, design, and engineering teams to translate technical requirements into effective solutions.
• Contribute to open-source development practices, including participating in peer reviews as both a reviewer and reviewee.
• Take ownership of technical initiatives, work autonomously, and remain accountable for project outcomes.
• Analyze complex systems and contribute to architectural and system design decisions.
• Communicate technical concepts and project outcomes clearly to both technical and broader audiences, including through written content and presentations.

Requirements

• Professional software engineering experience with a strong understanding of system design and complex distributed or technical systems.
• Ability to work independently, investigate challenging problems, and develop effective solutions with limited supervision.
• Strong analytical and problem-solving skills, with an ability to understand complex architectures and their interactions.
• Experience collaborating in an open-source or similarly transparent engineering environment is highly valuable.
• Comfortable participating in peer review processes and both giving and receiving constructive technical feedback.
• Strong sense of ownership, accountability, and responsibility for delivering high-quality outcomes.
• Excellent communication skills, including the ability to explain complex technical subjects clearly in plain English.
• Ability to collaborate effectively with multidisciplinary and geographically distributed teams.
• Genuine interest in blockchain, decentralized technologies, open-source software, and the future of the internet is desirable.

Benefits

• Fully remote and flexible working environment.
• Opportunity to work on foundational blockchain infrastructure and open-source technology.
• Collaboration with experienced engineers and leading minds in the Web3 ecosystem.
• Opportunity to make a direct impact on widely used decentralized technology.
• Global, distributed team with an open-source culture centered on collaboration and peer review.
• Opportunities to meet colleagues throughout the year through team and company-wide retreats.
• Contractor engagement through a UK-based entity.
• Inclusive and diverse international working environment.
• Professional growth opportunities through exposure to complex technical challenges and emerging blockchain technologies.
• Background checks are conducted through a trusted third-party provider as part of the hiring process.