Speech Blubs
Lead JavaScript Engineer

Lead JavaScript Engineer

We’re looking for a Lead JavaScript engineer, who would join us and work on our Speech Blubs app (speechblubs.com), which has already helped over 4,000,000 kids from all around the world!

We help kids aged 1-5 develop their speech and primary language through approved therapeutic techniques, supported by machine learning algorithms, based on large scale data sets. That gives us the ability to personalize the product for each user.


  • Lead a team of engineers and help mentoring their careers.
  • Develop backend features on NodeJS in a team of 3+ engineers.
  • Constantly optimizing and improving the current codebase.
  • Cooperate closely with designers, product owners and Android and iOS teams.
  • Learn and adopt new technologies as soon as they are released.

Our stack:

  • We use NodeJS and MongoDB for our backend services.
  • We use JavaScript ES6 wherever possible.
  • We provide REST API, services and queues for our mobile apps.
  • We use Nuxt/Vue to build our frontend web apps.
  • For infrastructure we use Heroku, DigitalOcean and AWS.

What do we expect:

  • Excellent programming skills in JavaScript.
  • Experience with various data architectures and paradigms.
  • At least 3-4 years of experience in software engineering.
  • Expert knowledge of Git, Heroku and similar development tools.
  • Fluency in English language (written and spoken).

What brings extra points:

  • Experience developing services hosted on Heroku and/or AWS.
  • Experience developing scalable backend systems.
  • Experience developing responsive web apps.
  • Experience with analytics services.
  • Experience with unit testing.
  • Contribution to open source projects.
  • Knowledge of agile development workflows.

What do we offer:

  • Full-time contract with 6-month probationary period
  • Young, agile and ambitious team with the vision of making an impact
  • Structured pay raise plan based on personal bi-annual and annual goals
  • Personal mentorship, opportunities to visit conferences, take online technical courses and participate in internal development workshops
  • Flexible working hours and different home office / office combinations
  • All work equipment & open modern office space in the centre of Ljubljana

If you meet the above requirements and would like to join us, please send your application in English or Slovenian to jobs@blubblub.org.

More about Blub Blub

Blub Blub Inc. creates high-quality smart screen time for children through our flagship Speech Blubs app, which was released in 2017 and is now the #1 speech and language app and #5 top-grossing app for children in the U.S.A. The app boosts young children’s comprehension and extends their vocabulary, whilst improving their pronunciation, attention, and even their emotional regulation.

We intend to become a leading player in early childhood education sector, with the offering of products that will help our users from saying the first words to having all the skills necessary to have a headstart in school.

Our team includes designers, marketers, growth experts, UX experts, data analysts, engineers, marketers, content creators, early education experts and psychologists. We are user- and customer-centric, data-informed, impact driven, and revenue-oriented. 

We have offices in Ljubljana (Slovenia), but work globally with experts, therapists, modeling agencies, and video production partners from Florida, London, Madrid, Johannesburg, Zagreb, …

If you want to test our app, let us know and we will be happy to send you a promo code! 

Apply now:

If you’re excited about the opportunity send your application to jobs@blubblub.org