Owner of "media stack" services for the Twilio Voice product.
Rewrote the webhook system from a legacy Twisted (Python) application to Java (Netty) for better scalability, performance and integration with rest of the stack. Required thorough understanding of asynchronous network programming, security (TLS, mitigating SSRF) and defensive programming techniques (throttling, rate limiting etc).
Designed and built a SIP registration system as part of the Twilio Global Low Latency project. Involved deploying services across multiple AWS regions and understanding AWS VPC, networking and firewalls. The backing store was Redis (with a sharding strategy) and the service was written in Java/Dropwizard.
Helped refactor a monolithic Java service that handled all Voice flows into multiple services. Required deep understanding of SIP/RTP. Role involved debugging call flows and interactions between services that spanned almost all Twilio products at the time.