Senior C++ Engineer

About us

Soundtrack is a B2B scale-up company providing music streaming services for businesses. We serve small customers like the café around the corner, and much bigger brands like Joe & the Juice, Toni & Guy and TAG Heuer. On the inside, we're a bunch of talented, motivated and humble designers, engineers and music experts. We believe in product-led growth, where the product is the primary driver of customer acquisition, conversion and expansion.

The Role

We’re looking for a Sweden based Senior Software Developer with strong experience in C++ and a passion for building seamless audio experiences. You’ll join Play & Control, the team responsible for ensuring that music plays beautifully and reliably across all our platforms.

While the "Control" side focuses on orchestration and coordination, you will join the "Play" side that owns the playback engine itself: how music is rendered, synchronized, and streamed. This is a high-impact role shaping the future of Soundtrack’s technology. You’ll work with a small, experienced team to evolve our in-house playback library - the critical layer connecting our backend to the app experience.

Responsibilities

In this role, you will together with the team:

• Architect and maintain our cross-platform playback ability - Today it's a cross-platform C++ library, but there might be other solutions going forward.
  
• Design and optimize the playback library that powers music streaming, ensuring low latency and high fidelity.
  
• Modernize existing systems, driving architectural decisions for refactoring and adopting new technologies.
  
• Collaborate across teams (frontend, platform, and backend) to ensure seamless integration across mobile, desktop, and embedded devices.
  
• Guarantee performance across diverse environments (Linux, Windows, Android, iOS, macOS).
  
• Innovate by exploring improvements in audio processing, network resilience, and cloud connectivity
  

About You

Just like us, you love music. You're curious, open-minded, and driven by craftsmanship. You thrive in collaborative environments, enjoy solving complex technical challenges, and take pride in building systems that people can rely on every day.

You’re comfortable diving deep into existing code, exploring how everything fits together, and then making it better. You value quality, understand performance, and see the beauty in well-structured, maintainable systems.

Requirements

• 5+ years of professional experience as a software engineer.
• Strong experience with C++.
• Proven ability to build and maintain cross-platform codebases.
• Solid understanding of systems programming, async design patterns, memory management, and performance optimization.
• Comfortable collaborating in a distributed, cloud-based environment

Beneficial

• Experience with build systems like CMake.
• Background in audio streaming or real-time media processing.
• Experience working with Linux-based embedded systems, specifically Yocto.
• Familiarity with other languages in our stack: Scala, Rust, Swift, Kotlin or Go.
• Exposure to cloud-based infrastructure (Kubernetes, GCP).
• Interest in music technology and sound systems
  

Employee Benefits

• We offer a flexible workplace with the possibility to work remotely
• Generous pension plan
• Yearly budget for health, wellness and personal development
• Laptop and mobile phone of your choice with included cellular subscription
• Regular social activities such as team events, meet ups, after works and off-sites
• Daily breakfast served at the office

At Soundtrack, we believe that diversity fuels creativity and innovation. We're committed to building a team that reflects a variety of backgrounds, perspectives, and experiences. We welcome applications from individuals of all races, ethnicities, genders, ages, abilities, religions, sexual orientations, and identities.

We reserve the right to close this vacancy early if we identify a suitable candidate before the application deadline. To ensure consideration, w