developer-apis enterprise-software telephony
San Francisco, CA

Senior Software Engineer- Phone Numbers


Because you belong at Twilio

The Who, What, Where and Why


Twilio is looking for a Senior Engineer for the Phone Numbers business unit (part of the Twilio Super Network), designing systems to support product development and associated systems for phone number purchase, management, ops tooling, integration into upstack Twilio products, and compliance (both customer-facing and infrastructural). This role requires expertise with distributed systems architectures, service and microservice design, complex workflow automation in high-scale environments, and secure, compliant data management and associated reporting.

You will need to be able to think at scale, in a way that supports world-class product development, including architecting for devOps support to insure test, staging, and production environment and data integrity. You are also comfortable with designing for and managing large database clusters (e.g. mysql, postgres), and secure and resilient synchronization with company-external data stores. You bring experience with complex distributed systems, working in a Java production system, and comfort with Python, Scala, and the demands of status-related UX implementations. 

Bachelor's degree or equivalent experience required.


A great day for you would be working alongside multiple but collaborative teams, building solution for Phone Numbers products, internal tooling, security, monitoring, and related reporting and management. You will be helping team to design solutions to support millions of transactions and issuing accurate invoicing for our customers. At the same time, you will be helping more junior developers by mentoring them, providing guidance, and positively influencing their careers. Experience working with distributed teams will be an advantage.


Twilio is a company that is empowering the world’s developers with modern communication in order to build better applications.  Twilio's customers send millions of communications every day. These communications are a firehose of micro-transactions, processed at a fraction of a penny at a time, millions of events per second. For both our instant-provisioning and high-compliance systems, it's critical to both external and internal customers that we provision, manage, operate, and deliver phone numbers and related products and services in highly reliable and fully compliant with national regulations around the world.

As a shared platform within Twilio, we have a responsibility to ensure that our systems can quickly and easily scale to support new products, 3rd-party integrations and new use-cases. As a member of the Phone Numbers team, you'll have an opportunity to take on some of the most challenging problems in distributed computing, HTTP, data persistence, and more.

Twilio is truly unique; we are a company committed to your growth, your learning, your development and your entire employee experience.  We only win when our employees succeed and we're dedicated to helping you develop your strengths. We invest in weeks dedicated to tackling hard problems and creating your own ideas. We have a cultural foundation built on diversity, inclusion and innovation and we want you and your ideas to thrive at Twilio. Come join us.  


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.

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. Pursuant to the San Francisco Fair Chance Ordinance, we will consider for employment qualified applicants with arrest and conviction records.

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