Senior C++/iOS Engineer - User Platform

About the Position

Senior C++/iOS Engineer - User Platform

Stockholm / London

Engineering – Platform /

Permanent / Remote

We’re looking for a Senior C++/iOS Engineer to join the Baldur squad within User Platform (UP). Baldur owns Spotify’s Session Management and Delegated Authorization domains-the systems that enable applications to securely obtain, use, and manage access tokens for hundreds of millions of users. In this role, you’ll help shape the technology that powers secure access across every Spotify client and third-party integration.

Your work will support engineers across Spotify building mobile and desktop experiences, platform teams, and third-party developers integrating with Spotify’s authorization platform. You’ll collaborate across disciplines to build secure, reliable, and scalable authentication experiences that have a direct impact on millions of people every day.

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, 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, 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++, along with experience building native iOS applications in Swift, or you're excited to develop your expertise in Swift while applying your 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 that span client and backend technologies.
• Solid understanding of software architecture, secure system design, and modern authorization protocols such as OAuth 2.0.
• Thoughtful problem-solving approach, with strong attention to detail and a focus on building secure, reliable, and maintainable solutions.
• Clear communication skills 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 in working on large-scale distributed systems where contributions improve experiences for hundreds of millions of Spotify users.

We Offer

• Flexibility to work from London or Stockholm.
• Hybrid work model with some in-person meetings.

About the Company

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. Our platform is for everyone, and so is our workplace. 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.

At Spotify, 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.

We may use artificial intelligence (AI) tools to support parts of the hiring process, such as reviewing applications, analyzing resumes, or assessing responses. These tools assist our recruitment team but do not replace human judgment. Final hiring decisions are ultimately made by humans. If you would like more information about how your data is processed, please contact us. Find our AI notice here: Spotify AI Notice