developer-apis enterprise-software telephony
Mountain View, San Francisco

Principal Software Engineer- Recordings


About the job:

Twilio's Cloud Communication Platform makes communications easy and powerful. With Programmable Voice, builders can create unique communication experiences to make, receive and control voice interactions around the globe.  The Programmable Voice team develops and operates the worldwide infrastructure for call processing, conference, voice media, recordings, and transcriptions.

As a Principal Software Engineer in Programmable Voice, you will design, develop, deploy and operate services across multiple teams to deliver real-time, highly available, low latency capabilities for next-generation internet and on-demand app communications.  You will ensure continuous operation at scale to meet high availability goals, focusing on solving resiliency, latency and quality challenges in our virtualized cloud environment.


  • Collaborate with Peers, Product Managers, Architects and Engineering leaders to define, architect and build new customer-facing features.
  • Operate Programmable Voice services based on Twilio standard procedures and guidelines, towards 24x7 availability, with high performance, scalable and zero downtime releases in AWS environment.
  • Employ Agile methodologies to continuously deliver value to customers.
  • Drive quality by writing unit, functional, load, performance and resiliency tests.
  • Release, monitor, and maintain features in a responsible, reliable way as part of our integrated DevOps practices.
  • Leadership is a behavioral trait, not a title, including leading architecture, design and code reviews as well as mentoring other engineers.


  • Minimum 5+ years experience building complex distributed systems across concerns of reliability, high-availability, performance, scalability, capacity planning, business continuity and automation.
  • Experience developing, deploying and scaling production systems in Java
  • Experience with modern scripting languages, preferably Python.
  • Experience managing large database clusters (e.g. mysql, postgres), and next generation distributed data stores is a plus
  • Experience with a scalable data pipeline, preferably with Kafka, Kinesis, Spark is a plus.
  • Can lead a small team through agile processes, continuous integration and test automation.
  • Direct experience with cloud services based on Amazon Web Services or similar.
  • Ideally, you have experience in a highly-available, uptime-critical production environment.
  • If you are not experienced in communications, no worries, you can learn.  We are seeking engineers who have solved complex problems at scale and have the aptitude to navigate uncharted waters.
  • Experience in large-scale distributed systems

Bonus points:

  • Understanding real-time communications technologies
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