Software Development Engineer in Test- Flex Agent UI

Twilio, London, United Kingdom

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Join the team as a Software Development Engineer in Test

Who we are & why we’re hiring
Twilio powers real-time business communications and data solutions that help companies and developers worldwide build better applications and rich customer experiences.

Although we're headquartered in San Francisco, we're on a journey to becoming a globally antiracist company that supports diversity, equity & inclusion wherever we do business. We employ thousands of Twilions worldwide, and we're looking for more makers, creators, and visionaries to help fuel our growth momentum.

About the job
At Twilio, our mission is to power the future of communications. We are growing fast and looking for a Software Development Engineer in Test to join our globally distributed Flex R&D organization, on our UI team based in London, UK. 

Twilio Flex is a fully programmable cloud contact center platform that enables mission critical customer communications for businesses such as Lyft, Shopify, Nike and many others.

Our modern UI enables several personas to get more done, through a single easy to use workspace living in the browser. 

We are looking for a motivated individual to help us to take Quality to the next level.

In this role, you’ll:

  • Work with the agile team to contribute to the overall quality of the product 
  • Write automated test scenarios
  • Write acceptance criteria and test cases
  • Collaborate with various stakeholders from Twilio’s R&D teams
  • Help troubleshooting issues and production escalation 
  • Maintain test suites and dashboards
  • Advocate for code quality and contribute to define quality standards and practices

Not all applicants will have skills that match a job description exactly. Twilio values diverse experiences in other industries, and we encourage everyone who meets the required qualifications to apply. While having “desired” qualifications make for a strong candidate, we encourage applicants with alternative experiences to also apply. If your career is just starting or hasn't followed a traditional path, don't let that stop you from considering Twilio. We are always looking for people who will bring something new to the table!


  • 4+ years of software development and/or testing experiences
  • Proficiency in modern development languages such as Java, Python, Javascript, Typescript
  • Experience with modern testing frameworks such as Cypress, Selenium, etc
  • Expert in Quality Assurance testing techniques
  • Proficiency in writing automation test suites as well as performing manual testing
  • Strong communication skills: in person, on paper, or in code. You can explain technical concepts to product managers, other engineers, and support
  • Passion for code quality, making things better and can-do attitude


  • Proficiency in Typescript and Cypress.io
  • Experience in coaching engineers on testing best practices
  • Experience with implementing and maintaining CI/CD test pipelines using tools like Jenkins/CircleCI or similar
  • Experience with AWS, containers and virtualization tools
  • Champion of good engineering habits: development techniques, security, tech debt balance
  • Experience with Agile software development approaches

This role is based in our beautiful office in SoHo square, central London, UK.
Flexible working model might apply. 

What We Offer

There are many benefits to working at Twilio, including, in addition to competitive pay, things like generous time-off, ample parental and wellness leave, healthcare, a retirement savings program, and much more. Offerings vary by location.

Twilio thinks big. Do you?

We like to solve problems, take initiative, pitch in when needed, and are always up for trying new things. That's why we seek out colleagues who embody our values — something we call Twilio Magic. Additionally, we empower employees to build positive change in their communities by supporting their volunteering and donation efforts.

So, if you're ready to unleash your full potential, do your best work, and be the best version of yourself, apply now!

If this role isn't what you're looking for, please consider other open positions.

About Twilio

Twilio's mission is to fuel the future of communications. Developers and businesses use Twilio to make communications relevant and contextual by embedding messaging, voice, and video capabilities directly into their software applications. Founded in 2008, Twilio has over 800 employees, with headquarters in San Francisco and other offices in Bogotá, Dublin, Hong Kong, London, Madrid, Malmö, Mountain View, Munich, New York City, Singapore and Tallinn.

Want to learn more about Twilio? Visit Twilio's website.