Because you belong at Twilio.

The Who, What, Why and Where

Twilio is growing rapidly and seeking a Principal Engineer to be a key member of the Twilio Flex R&D unit. Flex is Twilio’s contact center platform and is a unique solution that provides customers with the building blocks they need to build a fully customized contact center solution to meet their needs. You would be one of the first Principal Engineers in Bangalore, India for the Flex R&D unit. Reporting to an Engineering Director, you will play a key role in developing new capabilities for Flex with high reliability, scale, automation and observability, and will own your services end to end. Additionally, you will influence and implement architectural solutions that will enable Twilio to achieve our goal of being the world’s most trusted customer engagement platform.


Twilio is looking for a Principal Engineer who lives the Twilio Magic and has a demonstrated track record of building highly scalable and reliable enterprise native cloud applications, with an API first approach, has experience and exposure to the entire development lifecycle from idea to design, requirements to implementation, testing through deployment, and beyond into support. Not only will you be responsible for solving some of the most complex and exciting technical problems in the industry, you will also be working across the product scope based on priority needs and work directly with others to provide advice and guidance on implementation approach, lead cross-team technical discussions, build relationships across architecture and engineering that help resolve bottlenecks and provide the best production solution. You will also:

  • Bachelor’s or Master’s degree in Computer Science or related industry experience
  • demonstrated ability designing and developing highly-available, high-scale, secure, critical native cloud enterprise SaaS applications in Java, Go or Python.
  • Knowledge of architectural patterns and archetypes for building mature services, especially for distributed and multi-regional deployments.
  • Excellent abilities in high level service design - modeling interfaces and internals in a proper modular, composable, and extensible ways.
  • Experience with AWS, GCP or other public cloud infrastructure platforms. Multi-region deployment is a plus.
  • Experience building distributed systems at scale based on microservices architecture.
  • Experience with container technologies - Docker/Kubernetes.
  • Extensive experience with REST API design and implementation.
  • Experience with UI technologies and Micro Frontend implementation - JavaScript, React, Angular.
  • Experience with SQL/NoSQL databases and caches.
  • Familiarity with streaming systems such as Kafka, Flink, Spark
  • Experience implementing modern automated testing and CI/CD pipelines. Develop, Test, Deploy your code.
  • Ability to translate architecture vision into concrete system designs.
  • Champion of good engineering habits: development and test techniques, security, tech debt reduction.
  • Strong belief in automation over toil.
  • Positive attitude and ability to learn and execute quickly in a small team
  • Excellent written and verbal communication skills
  • Strong expertise in solving complex production issues.
  • Familiar with Scrum and Agile methodologies.
  • Previous experience with Contact Center and Customer Engagement solutions is a plus.


As a Principal Engineer (L5), you will:

  • EMPOWER OTHERS: Collaborate with other team members, including our Product team, to help influence, own, and improve our product offering
  • DRAW THE OWL: Influence teams to continuously be improving while supporting progressive ways to solve problems; adopt new technologies and strategies where applicable.
  • BE BOLD: Drive architecture and building systems for multiple orders of magnitude of growth. Every big idea starts small: open up the boundaries and keep setting a higher standard as solving small problems can bring big results. Never settle and keep pushing yourself and the teams forward.
  • DON’T SETTLE: Drive quality by writing unit tests, functional tests, and performance tests in a continuous delivery environment. Always look for the next opportunity for Twilio to improve our quality, reliability and security to continuously earn our customers trust.
  • BE AN OWNER: Support production operations, building, releasing and assisting with team on-call. Teams will be small and empowered so that you can move fast and ship to production multiple times in a 2 week sprint
  • WRITE IT DOWN: Evaluate opportunities, risk and technical strategies and provide key findings to internal stakeholders.

How You Work

  • Independent: Ask questions when something doesn’t make sense, and take ownership of initiatives in an organized fashion.
  • Organized: Meet deadlines and maintain high-quality work.
  • Communicative: Communicate clearly and concisely, orally and in writing.
  • Growth-minded: Eager and open to learn and evolve quickly.
  • Self-structured: Strong ability to work independently and efficiently, prioritize multiple tasks, and complete reliably.
  • Collaborative: Able to take ideas from many different sources and guide a group towards consensus.
  • Think strategically with an eye towards the future while being able to plot a course from the present.
  • Make critical decisions on high level technical strategy and set direction for a group of disparate engineers.
  • Comfortable working in a fast paced environment while continuously evaluating emerging technologies while mentoring junior engineers.


Twilio Flex is an omni-channel contact center platform built on top of Twilio’s communications products. Flex is a truly innovative SaaS solution which incorporates programmability into every layer of the stack allowing our customers to create a unique solution that meets their needs. This creates an amazing opportunity as well as an exciting engineering challenge to deliver a capable SaaS product that we invite our customers directly into so that they can customize its use. In this role, you will work with other engineering teams to extend the feature set offering to customers and therefore the overall solution reach of Flex. Your success would deliver great customer experiences at major brands around the world (Twilio’s customers), and you would enable them to deliver better services to their customers.

Twilio is a company that is empowering the world’s developers with modern communication in order to build better applications. 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 have a cultural foundation built on diversity, inclusion, and innovation and we want you and your ideas to thrive at Twilio.


This position will be located in our Bangalore, India office. Around the world, Twilio offers benefits and perks to support the physical, financial, and emotional well being of you and your loved ones. You will experience a company that believes in small teams for maximum impact; seeks well-rounded talent to ensure a full perspective on our customers’ experience, understands that this is a marathon, not a sprint; that continuously and purposefully builds an inclusive culture that empowers everyone to do their best work and be the best version of themselves.

About us:

Millions of developers around the world have used Twilio to unlock the magic of communications to improve any human experience. Twilio has modernized communications channels like voice, text, chat, video and email by virtualizing the world’s communications 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.


Important COVID-19 Guidance (For candidates applying to roles in the United States):

To comply with Executive Order 14042, all Twilio employees working in the U.S. are required to submit proof of vaccination for COVID-19 unless they qualify for a medical or religious accommodation / exemption. Employees onboarded after January 4, 2022 must submit proof of vaccination or receive approval for an exemption prior to their Twilio start date.   

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