developer-apis enterprise-software telephony
San Francisco, CA

Sr. Software Engineer - Web Infrastructure



Because you belong at Twilio

The Who, What, Where and Why

Web Infrastructure is a Platform team responsible for the front door of Twilio's Web Applications. Our services handle all web application traffic for Twilio. Our team is unique in that our services are used by Twilio customers and engineers alike.  If you are excited about scale, web technology, and world class web experiences you will learn a lot and act as a force multiplier on this team.

Are you passionate about ensuring that web application experiences are engaging with low latency and high reliability? Are you able to think at scale and ensure your services are able to scale horizontally?  Have you thought about how to enable teams to develop web application experiences in a decentralized fashion with consistency and cohesiveness? If the answer is yes to any of these questions, we want to talk to you!  


Twilio is looking for an intelligent, creative, and inspired Senior Software Engineer to join the Web Infrastructure team. We are seeking individuals with a demonstrated capacity to learn and adapt. Candidates should have demonstrated success working collaboratively to build highly reliable, low latency distributed backend systems. They should also have experience mentoring teammates to develop talented software engineers.

  • Experience in cloud architectures and complex distributed systems
  • Experience using caching technologies
  • Experience with load balancing and CDN technologies
  • Experience with web application performance tuning
  • Bonus points for experience implementing authentication and authorization for web applications
  • Bonus points for evented architectures and technologies
  • Bachelors degree in Computer Science or equivalent experience is required


A great day for you would be working on a small collaborative engineering team, building services and tooling to enable Twilio engineers to surface their Twilio web applications safely, easily, and quickly.  As a Senior Software Engineer on the Web Infrastructure team, you will be expected to:

  • Design, implement, and support microservices at scale in a collaborative environment
  • Mentor junior engineers to grow professionally
  • Champion and implement operational best practices and serve on-call for the team’s services
  • Participate actively in sprint, weekly, and quarterly ceremonies
  • Demonstrate quickness in learning and ability to teach constantly
  • Test rigorously and thoroughly
  • Communicate complex ideas simply through verbal and written communication


The Web Infrastructure team is responsible for our Web Application Platform which services all web console traffic.  As the front door for all web console experiences, our services have high uptime requirements and ambitious performance requirements. Twilio is comprised of 100+ autonomous empowered engineering teams that are startups responsible for a part of Twilio. There are various web application teams that build the UX for Twilio products. Our team provides a web application proxy that is a part of every web application page and view.  It is extremely important for us to build reliable, available, performant services!


Twilio believes in the power of Platforms to create leverage and empower developers. Our internal platforms enable our own small teams of developers to stand on the shoulders of giants, enabling them to focus on making world class services that delight our customers.

Twilio is truly unique: We are a company committed to your development, your growth, and your entire employee experience. We only win when our employees succeed and we're dedicated to helping you develop your strengths. Because we believe in our engineering staff, we dedicate two weeks out of the year to internal hackathons, where folks can tackle any challenge they see fit.


This position will be located in our beautiful office at 375 Beale Street in San Francisco. You will enjoy our incredible perks: catered meals, snacks, game room, ergonomic desks, massages, Wednesday Night dinners, bi-weekly All Hands and more. What you will also get to experience is a company that believes in small teams for maximum impact; that strives to balance work and home life, that understands that this is a marathon, not a sprint; that continuously and purposefully builds an inclusive culture where everyone is able to do and be the best version of themselves. We seek people who naturally demonstrate our values, who are challenged by problems, empower others to thrive, people who can draw the owl and not be beholden to one playbook.

About us:

More than 2 million developers around the world have used Twilio to unlock the magic of communications to improve any human experience. Twilio has democratized communications channels like voice, text, chat, and video by virtualizing the world’s telecommunications infrastructure through APIs that are simple enough for any developer to use, yet robust enough to power the world’s most demanding applications. By making communications a part of every software developer's toolkit, Twilio is enabling innovators across every industry — from emerging leaders to the world’s largest organizations — to reinvent how companies engage with their customers. Founded in 2008, Twilio has over 1,000 employees, with headquarters in San Francisco and other offices in Bogotá, Dublin, Hong Kong, London, Madrid, Mountain View, Munich, New York City, Singapore and Tallinn.

Twilio is proud to be an equal opportunity workplace and is an affirmative action employer. We are committed to equal opportunity regardless of race, color, ancestry, religion, gender, gender identity, parental or pregnancy status, national origin, sexual orientation, age, citizenship, marital status, disability, or Veteran status and operate in compliance with the San Francisco Fair Chance Ordinance.

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