Principal Full Stack Engineer - Localization

Twilio, Madrid, Madrid, Spain

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Because you belong at Twilio.

The Who, What, Why and Where

Twilio is growing rapidly and is looking for a talented, passionate and curious Principal Software Engineer to be a key leader in extending Twilio’s platform to International customers. This person will be technical leader of a newly formed team that builds a common translation and localization platform that will power Twilio’s developer console, docs, products, and other web properties. This position is critical in supporting Twilio’s International expansion and will build a platform that provides leverage to Twilio’s product and engineering teams.


Twilio is looking for a leader who lives the Twilio Magic and has a demonstrated track record of technical leadership.  They also have:

  • 7+ years of JavaScript experience with deep familiarity with best coding standards and proven record of high quality coding skills
  • 5+ years experience with the modern Web stack: notably React, Typescript, and Node.js. If you've worked with other frameworks (like Vue or Ember) that's a plus as well
  • Well versed (and opinionated) on what makes a good REST API. Experience in Java, Python, C++, or C#
  • Good working knowledge with cloud service providers and highly distributed systems
  • Aptitude for leading cross-team technical discussions and decisions
  • Strong technical and leadership acumen - Lead technical decisions for your team and influence technical decisions across your functional domains.
  • Expertise leading technical decision-making in collaboration with architecture and product needs to determine appropriate technologies for delivering an excellent customer experience
  • Expertise in agile processes, continuous integration, and test automation
  • Experience building and supporting mission critical, performant user-facing systems
  • Experience with building web localization frameworks, workflow/translation pipelines, and test/validation tools


As a Principal Software Engineer, you will live the Twilio Magic values:

  • DRAW THE OWL:  You will lead and guide teams in determining the appropriate technologies, structuring of data, and workflows in support of localization and translation of Twilio’s web properties.
  • DON’T SETTLE: You will partner with other architects, technical leadership and stakeholders to ensure all technology solutions align with product, security, and your long term vision and roadmap.
  • EMPOWER OTHERS: You must be a strong team leader. You enjoy mentoring and collaboration across engineering and product teams.
  • BE AN OWNER: Ensure the successful delivery of projects from vision, through execution, and reliable, dependable, scalable, operations.


Twilio is a fast growing company, rapidly expanding the breadth of our product offerings and the geographies we serve. The Global Twilio team is responsible for one of the major growth vectors for Twilio. We work closely with a broad set of internal stakeholders and international customers to bring the Twilio product portfolio into new markets. Our work has a significant impact on the trajectory of the company.

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 Paseo de la Castellana 77,  Madrid office. Around the world, Twilio offers benefits and perks to support the physical, financial, and emotional well being of you and your loved ones. No matter where you are based, 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 democratized 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.


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.