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About the Role

Join the Baldur squad within User Platform (UP) to shape the technology powering secure access across every Spotify client and third-party integration through our OAuth 2.0 infrastructure. Your work will support engineers building mobile and desktop experiences, platform teams, and third-party developers, impacting millions of users daily.

Responsibilities

• Collaborate with a highly autonomous and supportive engineering squad responsible for Spotify’s delegated authorization and session management platforms.
• Design, build, and evolve critical infrastructure powering Spotify applications and partner integrations using shared C++ libraries and native Swift on iOS.
• Develop secure, reliable, and performant delegated authorization flows, including token issuance, refresh, revocation, and session lifecycle management across multiple platforms.
• Partner with client and backend engineers to integrate with core authorization services, including Keymaster for OAuth token issuance, client registration, and token revocation.
• Improve how credentials and access tokens are securely stored and managed on-device while balancing security, reliability, and application performance.
• Contribute to the evolution of Spotify’s authorization frameworks, including OAuth 2.0 and Spotify-specific implementations, enabling new platforms and product experiences.
• Drive technical improvements, share knowledge with teammates, and help shape the long-term technical direction of delegated authorization and session management.

Requirements

• Strong proficiency in C++.
• Experience building native iOS applications in Swift, or excitement to develop Swift expertise while applying C++ skills.
• Experience designing, building, or maintaining security-sensitive systems such as authorization, authentication, token management, credential storage, or related platforms.
• Systems-thinking mindset and enjoyment in solving complex engineering challenges spanning client and backend technologies.
• Solid understanding of software architecture, secure system design, and modern authorization protocols such as OAuth 2.0.
• Thoughtful approach to problems with strong attention to detail and a focus on building secure, reliable, and maintainable solutions.
• Clear communication and enjoyment in collaborating with engineers across multiple teams and technical disciplines.
• Experience working with shared cross-platform codebases and understanding how native platform layers interact with common C++ libraries.
• Enjoyment working on large-scale distributed systems where contributions improve experiences for hundreds of millions of Spotify users.

Skills

• C++
• iOS
• Swift
• OAuth 2.0
• Software Architecture
• Secure System Design
• Token Management
• Credential Storage
• Cross-platform codebases

Location

• London
• Stockholm

Work Type

• Hybrid

Experience Level

• Senior

About the Company

• Spotify is an equal opportunity employer.
• Our platform is for everyone, and so is our workplace.
• We are passionate about inclusivity and making sure our entire recruitment process is accessible to everyone.
• We have ways to request reasonable accommodations during the interview process and help assist in what you need.

Equal Opportunity

• Spotify is an equal opportunity employer.
• You are welcome at Spotify for who you are, no matter where you come from, what you look like, or what’s playing in your headphones.
• The more voices we have represented and amplified in our business, the more we will all thrive, contribute, and be forward-thinking!
• So bring us your personal experience, your perspectives, and your background.
• It’s in our differences that we will find the power to keep revolutionizing the way the world listens.
• We are passionate about inclusivity and making sure our entire recruitment process is accessible to everyone.
• We have ways to request reasonable accommodations during the interview process and help assist in what you need.
• If you need accommodations at any stage of the application or interview process, please let us know - we’re here to support you in any way we can.