Senior Javascript Developer Job Offer

Who we are

Mailtrack is the leading solution for professionals using Gmail for sales, communication, hiring and any other business activities. We empower more than 2M users with our free plan and over 110,000 paying users worldwide.

We are a diverse and multicultural team. We hire the best and most passionate people willing to impact millions of users using Gmail. Our mission is to create amazing and simple tools to manage your communication that you will use every day.

Trust, scalability, reliability and ease of use is our focus. We want to become the leading solution for Gmail users worldwide and become the most reliable solution to connect professional users with Gmail.

What we do

Mailtrack is a Gmail extension that provides email marketing services: campaigns, mail merge, email tracking, PDF tracking and link tracking among many other features.

Our users are based all around the world and have very different needs and profiles (teachers, lawyers, real state agencies, small sales departments, amongst others).

What you’ll do

As a Javascript developer, you’ll be responsible for maintaining and expanding the browser extension that provides Mailtrack’s service. You will be asked, as well, to write modular and testable code to power up our extension and occasionally nodejs backend code that we use in some of our services. We work in an agile environment with extreme programming principles in mind, like continuous integration, test-driven development and refactoring. Our squads do not include QA or operations roles so you will develop these skills as well, always with a focus on automation.

What are we looking for?

  • Your job will be mainly to write code for our browser extension, so a minimum experience of 4 years developing frontend applications, with no particular framework but solid understanding of frontend technologies (Javascript, CSS, and HTML).
  • Be able to write nodejs code that powers some of our backend services.
  • All communications in Mailtrack are in Spanish so you need to be able to communicate fluently in Spanish(written and spoken). We require, as well, a good level of written English.
  • And last, but not least, you are a team player, you enjoy working with people and solving problems together.

Extra points if you

  • Worked previously using the libraries that we use in our stack: Typescript, Webpack, Rxjs, React, Redux, SASS and Jest.
  • Understand functional programming and have experience working with observables (we use rxjs).
  • Have previously developed browser extensions, gmail addons, or worked with Google Apis (especially Gmail).
  • We do not require a formal degree but we value candidates who have obtained an engineering degree.
  • As we have a testing mindset, we appreciate candidates who are used to writing tests, not only unit but also functional (we use

What we offer

  • We work at a stress-free sustainable pace to develop features we think will improve an existing product.
  • We are a company proud of taking care of our employees, with extensive benefits to reconcile work and family life. We pay private health insurance for you and your family and have a company-wide week break.
  • We focus on the continuous improvement of our employees and aim to help them develop themselves professionally to the highest level, so we have internal training and a personal budget for external training and conferences.
  • Flexible working hours and choose to work either remotely or from our excellently located Barcelona office (Rambla Catalunya/Còrsega) with a sunny terrace.
  • Competitive salary
  • Choice of Linux laptop.

Apply at

The data controller is THE MAIL TRACK COMPANY, S.L. (“Mailtrack“) with registered office at calle Córcega 301, Ático 2ª, 08008 – Barcelona (Spain). The purpose of the processing of the data contained in your CV and obtained throughout the interviews is the development of the recruitment process. The processing of your data is based on the application of pre-contractual measures as it is a necessary activity to evaluate your profile for the recruitment process. Your data will not be disclosed or communicated to third parties, unless expressly required by law or unless you give us your consent. Your data will be kept for one year in order to be able to consider your profile for future vacancies. After this time, your data will be blocked, and once the legal limitation periods have expired, deleted. You can exercise your rights regarding data protection at the following address: You may also seek the assistance of the Spanish Data Protection Agency at

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