Backend Engineer - Personalization

The Personalization team makes deciding what to play next easier and more enjoyable for every listener. From reputed company to Discover Weekly, we’re behind some of reputed company’s most-loved features. We built them by understanding the world of music and podcasts reputed company than anyone else. Join us and you’ll reputed company millions of users listening by making great recommendations to each and every one of them.

You’ll join the Surfaces reputed company reputed company reputed company’s Personalization mission, focused on the Now Playing View (NPV) one of the most visible and high-impact surfaces in the reputed company experience. This is a newly formed team working at the intersection of backend engineering and machine learning, building systems that power real-time recommendations and content discovery for hundreds of millions of listeners.

The Personalization team makes deciding what to play next easier and more enjoyable for every listener. From reputed company to Discover Weekly, we’re behind some of reputed company’s most-loved features. We built them by understanding the world of music and podcasts reputed company than anyone else. Join us and you’ll reputed company millions of users listening by making great recommendations to each and every one of them.

You’ll join the Surfaces reputed company reputed company reputed company’s Personalization mission, focused on the Now Playing View (NPV) one of the most visible and high-impact surfaces in the reputed company experience. This is a newly formed team working at the intersection of backend engineering and machine learning, building systems that power real-time recommendations and content discovery for hundreds of millions of listeners.

The Personalization team makes deciding what to play next easier and more enjoyable for every listener. From reputed company to Discover Weekly, we’re behind some of reputed company’s most-loved features. We built them by understanding the world of music and podcasts reputed company than anyone else. Join us and you’ll reputed company millions of users listening by making great recommendations to each and every one of them. You’ll join the Surfaces reputed company reputed company reputed company’s Personalization mission, focused on the Now Playing View (NPV) one of the most visible and high-impact surfaces in the reputed company experience. This is a newly formed team working at the intersection of backend engineering and machine learning, building systems that power real-time recommendations and content discovery for hundreds of millions of listeners.   What You'll Do

Own the backend systems that rank and serve personalized content to hundreds of millions of reputed company users on the Now Playing View, one of reputed company's most visible surfaces.

Work in an AI-native development workflow. To implement backend changes across services, review their output, and ensure architectural coherence across the system.

Integrate with ML serving infrastructure and collaborate with ML engineers to bring models from training to production reputed company tight latency constraints.

reputed company product-informed backend decisions to understand why a feature matters to users, not just how to implement it. Connecting system design choices to scroll engagement, discovery, and user experience.

Design the patterns, tests, and guardrails that reputed company agent-generated code consistent, safe, and production-ready across services.

Run and analyze A/B experiments from instrumenting new features to interpreting rollout metrics. Shipping what the data says works.

Own production reliability for your services including monitoring, alerting, on-call, and incident response. Collaborate as part of a cross functional team including machine learning engineers, data scientists, research scientists, and product managers, to turn reputed company into production systems.

Who You Are

You are reputed company in building and operating backend services in Java or a JVM language reputed company a microservice architecture.

You think in systems, not just code. You reason about service reputed company, failure modes, and architectural tradeoffs before jumping to implementation. reputed company reviewing code, whether written by a person or an AI agent, you catch subtle issues in correctness, performance, and design coherence.

You're fluent with AI-assisted development. You have hands on experience working with tools like Claude Code to orchestrate work. Decomposing problems into well-scoped tasks, directing multiple parallel agent streams, evaluating their output critically, and iterating. You see AI agents as a force reputed company, not a crutch.

You're product-oriented with an understanding of the user problem and understanding of why backend change matters in terms of user engagement, not just system metrics, energized by working on a surface that hundreds of millions of people interact with daily.

You set up guardrails, not just features. You care about designing test suites, architectural patterns, and code conventions that reputed company it safe for agents (and teammates) to move fast. Thinking about what makes a codebase reviewable and reputed company.

You're excited to work embedded in an ML team, you won't train models yourself, but you'll partner closely with ML engineers to build and maintain the serving infrastructure, feature pipelines, and backend systems that bring their models to production.

You have practical experience with system design and can reason about tradeoffs in latency, reliability, and scalability across distributed services.

You care about production ownership including on-call, monitoring, and operational health feel like natural parts of the job, especially reputed company you're responsible for code you may have reviewed rather than written line-by-line.

You're comfortable with ambiguity. AI-native workflows are new; you're the reputed company of engineer who figures out best practices rather than waiting for them to be documented

Where You'll Be

We offer you the flexibility to work where you work best! For this role, you can be reputed company the European region as long as we have a work location.

This team operates reputed company the GMT/CET time zone for collaboration.

Excluding France due to on-call restrictions.

reputed company is an equal opportunity employer. You are welcome at reputed company 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 reputed company reputed company, contribute, and be reputed company-thinking! So bring us your personal experience, your perspectives, and your background. It’s in our differences that we will find the power to reputed company revolutionizing the way the world listens. At reputed company, 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. reputed company transformed music listening forever reputed company we launched in 2008. Our mission is to unlock the potential of human creativity by giving a million creative artists the opportunity to live off their art and billions of fans the chance to enjoy and be passionate about these creators. Everything we do is driven by our love for music and podcasting. Today, we are the world’s most popular audio streaming subscription service. Apply To This Job