The Role
Join the Baldur squad to design and build Spotify's delegated authorization and session management systems. Develop secure, cross-platform C++ libraries and native iOS Swift components for token issuance, refresh, revocation, and on-device credential storage, collaborating with client and backend teams to scale OAuth 2.0 infrastructure used by millions.
Summary Generated by Built In
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.
What You'll Do
- 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.
Who You Are
- You have 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.
- You have experience designing, building, or maintaining security-sensitive systems such as authorization, authentication, token management, credential storage, or related platforms.
- You bring a systems-thinking mindset and enjoy solving complex engineering challenges that span client and backend technologies.
- You have a solid understanding of software architecture, secure system design, and modern authorization protocols such as OAuth 2.0.
- You approach problems thoughtfully, with strong attention to detail and a focus on building secure, reliable, and maintainable solutions.
- You communicate clearly and enjoy collaborating with engineers across multiple teams and technical disciplines.
- You have experience working with shared cross-platform codebases and understand how native platform layers interact with common C++ libraries.
- You enjoy working on large-scale distributed systems where your contributions improve experiences for hundreds of millions of Spotify users.
Where You'll Be
- This role is based in London or Stockholm.
- We offer you the flexibility to work where you work best! There will be some in person meetings, but still allows for flexibility to work from home.
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.
Skills Required
- Strong proficiency in C++
- Experience building native iOS applications in Swift or willingness to develop Swift expertise
- Experience designing, building, or maintaining security-sensitive systems (authorization, authentication, token management, credential storage)
- Solid understanding of OAuth 2.0 and modern authorization protocols
- Experience working with shared cross-platform C++ codebases and native platform interactions
- Systems-thinking mindset and experience with large-scale distributed systems
- Strong software architecture, secure system design, and attention to detail
- Clear communication and collaboration across multiple engineering teams
Spotify Compensation & Benefits Highlights
The following summarizes recurring compensation and benefits themes identified from responses generated by popular LLMs to common candidate questions about Spotify and has not been reviewed or approved by Spotify.
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Flexible Benefits — Employees consistently praise the total compensation package beyond base salary, highlighting a mix of RSUs, cash incentives, and stipends alongside core pay. The package is described as flexible and customizable through equity choices (e.g., RSUs, options, cash) that can be tailored for long-term wealth building.
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Leave & Time Off Breadth — Time-off offerings are repeatedly highlighted as substantial, including generous vacation, paid sick days, volunteer time, and flexible holidays. These policies are framed as a meaningful part of the overall rewards experience beyond salary.
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Healthcare Strength — Health coverage is portrayed as comprehensive, spanning medical, dental, vision, life insurance, disability coverage, and mental health support. Additional employer contributions to HSAs are cited as strengthening the overall health and wellness value proposition.
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The Company
What We Do
Spotify transformed music listening forever when it launched in Sweden in 2008. Discover, manage and share over 50m tracks for free, or upgrade to Spotify Premium to access exclusive features including offline mode, improved sound quality, and an ad-free music listening experience.
