At Sonos we want to create the ultimate listening experience for our customers and know that it starts by listening to each other. As part of the Sonos team, you’ll collaborate with people of all styles, skill sets, and backgrounds to realize our vision while fostering a community where everyone feels included and empowered to do the best work of their lives.

Senior DSP Software Engineer | IC3

This role is an office-based position

This position is considered office-based. Qualified applicants must live within commuting distance of our Glasgow office and should expect to be in office 3 days a week.

At Sonos we want to create the ultimate listening experience for our customers and know that it starts by listening to each other. As part of the Sonos team, you'll collaborate with people of all styles, skill sets, and backgrounds to realize our vision while fostering a community where everyone feels included and empowered to do the best work of their lives.

The Wearables DSP team implements and integrates the audio signal processing that runs on Sonos headphones and other battery-powered products: active noise cancellation, transparency, voice pickup, Bluetooth audio, and music playback. We take algorithms from our acoustics and innovation partners and turn them into efficient, well-tested production code running on resource-constrained embedded DSPs, supported by our own tuning, simulation, and code-generation tooling. As a Senior DSP Software Engineer you will own the implementation of audio algorithms from reference model to shipping product, and bring strong software engineering discipline to everything you touch. You will work with a small, experienced team on both our current products and the next generation of Sonos products.

What You'll Do

• Design, implement, and maintain audio signal processing software in C/C++ on embedded fixed-point and floating-point DSP platforms, owning features and subsystems from requirements through release.
• Turn algorithm specifications and reference models (MATLAB or Python) from our acoustics and innovation partners into efficient, maintainable, production-quality implementations, working through precision, headroom, and numerical issues.
• Build and extend automated testing for DSP code: unit tests, bit-exact and tolerance-based regression against reference models, host-based simulation, and continuous integration.
• Profile and optimize on target hardware for cycles, memory, and power, and communicate trade-offs clearly to inform product and architecture decisions.
• Own and evolve our Python tooling for algorithm parameter definition, tuning, code generation, and test automation, improving productivity across the team.
• Port and adapt algorithm implementations across DSP platforms, designing for reuse and portability.
• Diagnose and resolve complex defects that span algorithms, firmware, and hardware, working closely with firmware, audio, acoustics, and app teams.
• Prototype and evaluate new algorithms and features to help assess feasibility and scope for future products.
• Contribute to design discussions, technical documentation, and code reviews, giving constructive feedback and mentoring early-career engineers.
• Plan and estimate your work, and communicate progress and risks proactively.

What You'll Need

Basic Qualifications

• Bachelor's degree or equivalent in Electrical Engineering, Computer Engineering, Computer Science, Audio Engineering, Mathematics, or a related discipline.
• Approximately 5 years of relevant industry experience developing embedded or real-time software, including signal processing, or equivalent demonstrated competence.
• Strong C and/or C++ programming skills, with experience shipping production embedded code.
• Solid grounding in digital signal processing fundamentals: sampling, z-transform, FIR and IIR filter design and implementation, frequency transforms, and multirate processing.
• Experience implementing and verifying DSP algorithms on resource-constrained targets, including fixed-point arithmetic.
• Proficiency in Python or MATLAB for analysis, tooling, and test automation.
• Experience with professional software engineering practices: Git, code review, and automated testing or continuous integration.
• Experience profiling and debugging on target hardware using embedded toolchains and debuggers.
• Ability to communicate technical ideas clearly in writing and in conversation, including with colleagues in other disciplines.
• Qualified applicants must be able to work from the Glasgow or Louisville office 5 days per week.

Preferred Qualifications

• Experience with embedded DSP platforms such as Cadence Tensilica HiFi, Qualcomm Kalimba, Analog Devices DSPs, or Arm Cortex-M with CMSIS-DSP, including SIMD or vector optimization.
• Experience building developer tooling, such as code generation, host-based simulation, or CI infrastructure for embedded targets.
• Experience in audio, speech, or acoustics products, such as headphones, hearables, telephony, or Bluetooth audio.
• Familiarity with adaptive filtering or real-time control concepts, such as those used in active noise cancellation. Specialist ANC experience is not required.
• A track record of mentoring less experienced engineers and of taking ownership of work handed over from others.
• A curious, growth-oriented mindset and a record of following through on commitments.

Inclusion: Research shows that some candidates may not apply for roles if they don't meet all the criteria. If you don't have 100% of the skills listed, we still strongly encourage you to apply if interested.

Visa Sponsorship: Sonos is unable to sponsor or take over sponsorship of an employment visa for this role at this time. We ask that applicants be authorized to work for us in country of role posting, both now and in the future.

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Your profile will be reviewed and you'll hear from us once we have an update. At Sonos we take the time to hire right and appreciate your patience.