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Principal Performance Test Engineer

Department: Software

Location: Boston, Seattle

Req#: 2891

We seek to create the ultimate listening experience by combining great sounding hardware with flexible and well-designed software. Sonos operates in three of the most innovative and fast-paced areas of today’s software landscape: deep hardware-software co-design and integration, Internet music services, and apps for smartphones and tablets. Through our software, we are making the home stereo system a first class participant in the Internet of Things, transforming it from something analog, disconnected, and dumb, to something digital, connected, and smart.


Sonos is passionate about delivering superior quality Wireless HiFi systems to our customers. Our work environment is highly-collaborative, fast-paced and challenging. The problems are complex and the solutions elegant. Throughout our rapid growth, we have delivered great products while maintaining a best-in-class quality bar.


As a Principal Performance Engineer, you will work with a small Scrum team to validate the scalability of Web Services and APIs in a distributed, highly complex system. You will benchmark current systems, develop models, design and execute tests, analyze results, identify bottlenecks, configure/optimize cloud infrastructure parameters, and then repeat the test suite to achieve maximum performance. You will collaborate closely with your partners in software development to define and execute the test strategies and tactics, including automation. If you love music, solving challenging problems, and delivering high-quality products, we want to talk with you!

About You

Our band is large. And while there’s plenty of room for all kinds of personalities and skill sets to succeed, there are certain qualities that will help you thrive here.

Like a never-accept-less work ethic. An exceptionally low ego-to-talent ratio (none of the first, tons of the latter). A relentless craving to push past your limits and try new things. The smarts and the humble confidence to take on big challenges, make mistakes fast and early, embrace tough feedback, then recover quickly with fresh, startlingly perfect solutions. A fearless willingness to defend great work. And a tendency to totally geek out on music.

If this sounds like you, read on and let’s connect soon.

What You’ll Do
  • Develop and execute a performance testing strategy for Sonos’ Web Services and APIs, simulating both real world load scenarios and hypothetical failure scenarios.  You will need to test performance, capacity, and scalability across multiple systems and services from hardware, cloud, and databases.
  • Write and maintain custom automation code (as any “off-the-shelf” tools will likely need to be adapted to Sonos’ specific architecture and needs) for scale testing to automate the deployment of large scale test infrastructure, load test automation and reporting capabilities.
  • Design, develop and maintain automated performance tests at both system and component level and include performance regression testing in to a Continuous Integration environment
  • Incorporate performance evaluation into our continuous integration process & deployment pipeline. Establish best practices for performance testing across the organization.
  • Work with engineering teams to understand the application/platform non-functional requirements and develop strategies to verify and validate the same by translating the requirements to meaningful and effective test scenarios.
  • Design and develop various types of performance tests like scalability, stress, soak, system high availability etc.
  • Work with development & test teams to analyze system behavior, isolate bottlenecks, tune and resolve defects related to performance and capacity.
  • Collaborate with Engineering & Operations teams to tune, configure, and optimize cloud platform components and services and ensure operational readiness for production.
  • Analyze, review and present performance results with findings & risk analysis & recommendations to stakeholders.
  • Investigate, log, track, and triage bugs to determine root cause and establish prioritization.
Skills You’ll Need
  • BS/BA in Computer Science, Software Engineering, or equivalent experience.
  • 7+ years of Software Test or SQA experience with an emphasis in performance, load, capacity, and scale testing.
  • Deep, hands-on experience with performance testing tools (Jmeter, the Grinder, Gatling, Chaos Monkey, etc)
  • Experience with cloud technology (AWS required)
  • Experience with performance test planning, automation, execution, application analysis & troubleshooting in an Agile development environment
  • Full stack performance engineering capabilities, ranging from instrumenting application tier to analyzing back-end data stores (e.g., Cassandra, MySQL), API gateways and caching infrastructures
  • Deep knowledge of test automation principles, with scripting/programming experience in Python, Java, Ruby, etc.
  • Experience in APM tools like Appdynamics, Dynatrace, New Relic, etc.
  • Experience in using Application profiling tools like YourKit, VisualVM, JProfiler or JVM tools like Jmap, Jstack, Eclipse MAT, IBM Heap Analyzer to pinpoint issue
  • Service monitoring and alerting expertise; working knowledge of one or more of the following - Cloudwatch, Sensu, Graphite/Grafana, Kibana/ELK stack, logstash, rsyslogd,etc.
  • 1+ year of Ansible/Ansible Tower or similar deployment orchestration tools (Puppet, Chef, Salt)
  • Experience with caching layer technologies (memcached / Elasticache, redis) and CDN services such as Akamai etc.).
  • Excellent analytical and troubleshooting skills.
  • Excellent verbal and written communications skills.
How to Audition
Apply now and if there is a strong match, we'll reach out!
More About Our Band

In 2002, we set out to reinvent home audio for the digital age. Our mission–to fill every home with amazing sounding music. Yes, it was an ambitious goal. Challenging, too. And that hasn’t changed.

Since those early days, we’ve remained tirelessly focused on finding innovative ways to make listening out loud, with friends and loved ones, the truly transformative experience it should be. We’ve seen our vision capture the imaginations of music lovers in more than 60 countries, as we’ve continued to introduce products, software, and technologies that help people share the songs they love, discover new music they never knew existed, and experience richer, more musical lives.

At Sonos, we are building a team with extraordinary talent to help us fill every home with music. We are committed to equal employment opportunity regardless of race, color, ancestry, religion, sex, national origin, sexual orientation, age, citizenship, marital status, disability, gender identity or Veteran status.