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Senior Embedded DSP Software Engineer, Audio

Department: Hardware

Location: Boston, Seattle

Req#: 4768

At Sonos we are passionate about building and delivering the finest HiFi audio experiences to our customers.  Our products stream all the music on earth, in every room, wirelessly, and you control it all from the palm of your hand.  It’s easy to use, but keeping things simple and bug free is hard work.

As an embedded DSP Software Engineer working as part of the hardware organization, you are a highly skilled embedded software engineer that thrives in new product development environment and being up close and personal with hardware. You will be working closely with our signal processing algorithm researchers to help refine, tune and optimize our audio and voice algorithms to execute efficiently and flawlessly on our embedded processor platforms. You will be responsible for helping to turn new ideas and technical innovations into products that continue to delight our customers and set the satisfaction bar higher. You will be a member of a team that is setting new standards for the audio industry and reshaping the way consumers engage with music. You will work independently as well as with a team of industry leading innovators in other engineering fields such as acoustics, mechanical, application software, hardware, and user experience. If you love music, solving challenging problems and doing things the right way every time, we would like to talk to you!

About You

You're not like everyone else.

You bring a unique perspective to the table. Transparency tops your list of values. Your smarts and creativity are off the charts, matched only by your humility. You want to collaborate with a team of diverse talent. You proactively contribute to a culture of respect and inclusion.

You enjoy a challenge.

Inquisitive and focused, you see every challenge as an opportunity. You're ambitious and unafraid to make mistakes because you learn from them and bounce back quickly. You don't stop until you get it right. "Impossible" isn't in your vocabulary. You're more interested in creating the future than waiting for it.

You love to listen.

You start every interaction from a place of listening and seeking to understand. You're culturally connected. You remember your first concert. You can readily recommend a binge-worthy show on Netflix, Hulu or HBO. You can't sit in traffic without a great audiobook, podcast or album. You can make a killer playlist. Your idea of a good weekend includes watching a movie or playing a video game.

What You’ll Do

•  Develop optimized and efficient implementations of DSP algorithms for audio and voice processing from MATLAB models and give direction and feedback to algorithm developers on how to best structure algorithms to efficiently map them to various DSP processor architectures. 

•  Understand the end-to-end signal processing pipeline and use the DSP blocks to build complete systems.  

•  Interface with other software teams to define the proper DSP building blocks and APIs and how best to partition and schedule the processing across cores in a multi-core SOC device.

•  Understanding where each and every processor cycle is being used so that the maximum amount of processor headroom is always available. 

•  Debug and isolate complex low level problems where the lines between software and hardware may not always be clear. 

•  Contribute to a portfolio of reusable and maintainable DSP processing blocks that can support multiple concurrent product development programs.  

Skills You’ll Need
•  7-10 years of real-time algorithm development on embedded DSP processors
•  Expertise in high fidelity audio and voice processing applications. 
•  Fluent in C and C++ programming languages.
•   Expertise with TI, Analog Devices or Cadence Hifi based DSP devices
•  Possess a solid understanding of time domain and frequency domain processing fundamentals. 
•  Thorough understanding of CPU architectures (ARM, MIPS) and complex SOC device and how to partition processing across multi-core architectures. 
•  Demonstrated ability to design and develop portable and maintainable code that is processor architecture and OS agnostic.
•  Code optimization for speed and memory usage using efficient C, processor intrinsic functions and low level assembly code. 
•  Familiar with developing under embedded RTOSs (VxWorks, QNX Free-RTOS, ucOS) 
•  Experience with benchmarking algorithm performance on embedded systems using software and hardware techniques. 
•  Highly proficient in the use of common source code control and defect tracking systems. (Jira, Perforce, Git, ClearQuest, ClearCase)
•  Successful use of various hardware and software debugging techniques including JTAG debuggers and emulators.
•  Also very helpful if you’re an active musician, audiophile or have possibly developed DAW plugins and may have some recording experience.

More About Sonos

In 2002, Sonos set out to reinvent the way people listen at home. The wireless home sound system we created makes it easier than ever to fill any and every room with music, podcasts, TV, and just about anything else you could ever want to hear-all with brilliant, immersive clarity. Since then millions of people in over 60 countries have made Sonos part of their lives.

Today we remain focused on innovation, thoughtfully designing products, inventing new technologies, expanding our software platform, crafting the best sound experience and making a positive social impact in the world.

We're empowering people to listen better because listening builds understanding and drives change. It even increases happiness and brings people together. Simply put, listening leads to a better life. (We've got the data to prove it.)

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Notice to U.S. Job Applicants: Sonos is an equal opportunity employer. We evaluate qualified applicants without regard to race, color, religion, sex, sexual orientation, gender identity, national origin, disability, veteran status, and other legally protected characteristics.

Follow the links to review the EEO is the Law poster and its supplement. The pay transparency policy is available here. Sonos is committed to working with and providing reasonable accommodations to individuals with disabilities. If you need a reasonable accommodation because of a disability for any part of the employment process, please send an e-mail to and let us know the nature of your request and your contact information.