developer-apis enterprise-software telephony
Madrid, Spain

Senior Software Engineer in Test



Because you belong at Twilio

The Who, What, Where and Why


Twilio is looking for a Senior Software Engineer in Test who wants to design and build test infrastructure for our media services, which power the best in class video SDKs.  You are great for this role if you enjoy finding weak points in complex systems. You will need to be able to think at scale and bring focus on solving resiliency, latency and quality challenges. You bring experience building test tools and infrastructure, load and stress testing complex distributed systems. Bonus points for experience with WebRTC, SIP, VoiP, websockets, mobile or frontend development. Bachelor's degree in a computer science related field is a minimum requirement.


A great day for you would be building test tools and being a quality advocate of Twilio’s newest and fastest growing products, Programmable Video. In doing so, you will provide best experience to builders and developers all over the world, who use us to add real-time video to their apps. You will be working alongside media server teams in Madrid in close collaboration with other video teams in California.


The Programmable Video team enables builders to create unique communication experiences to connect users in a video conference with real-time SDK control and REST APIs to control the experience, all based on WebRTC.  The Programmable Video team develops and operates the worldwide infrastructure for video processing, media, recordings and compositions and is a high growth product in the Twilio catalog.

Twilio is a company that is empowering the world’s developers with modern communication in order to build better applications.  This team is powering the company’s commitment to WebRTC, one of the newer product areas at Twilio.

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 Paseo del Club Deportivo, 1, Edif. 17 in Madrid. 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'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 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.

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