Senior Front-End Engineer

Ljubljana, SI

Front End Engineers at Celtra build and own innovative web apps using modern JavaScript, advanced CSS, Vue.js and Backbone.js with a desire to create beautiful web apps with great user experience. 

You will be responsible:

  • for improving architecture of our Single-Page Applications
    • writing scalable and maintainable CSS
    • improving unit, integration and end-to-end tests
    • improving our predictable state container
    • improving front-end development tools and development process to improve productivity of other developers,
  • act as technical lead on front-end projects, either new web app needs to be build from scratch or complex feature needs to be added on our existing Backbone.js + Vue.js,
  • technical leadership of new web apps or adding a new complex UI features,
  • constantly bringing new ideas and knowledge to the team.


What we expect? 

  • A critical thinker with the capability of making decisions with dedication to product quality.
  • 4+ years of experience
  • Diverse and deep experience in modern web technologies, with focus on Javascript, CSS and HTML.
  • Experience with JavaScript frameworks (VueJs, Backbone, Angular, Ember, React).
  • Understanding of modern concepts behind frameworks (state management, virtual DOM, reactivity, server-side rendering...).
  • Write code that is efficient, reliable, and easy to understand.
  • Good understanding of web app performance.
  • Proficiency with Chrome Developer Tools.
  • Web browser performance.
  • Write technical specifications and doing code reviews.
  • Experience with front-end automated tests.
  • Experience with multiple languages and programming paradigms.
  • Fluent written and spoken English - you will be using it every day.
  • Someone who can work with product owners and the QA team to implement and deliver features in a timely manner.
  • Up to date with current and future trends of the web platform.
  • Good general programming knowledge and understanding of modern software development processes.


What brings you extra points?

  • Knowledge of server-side technologies (PHP, Ruby on Rails, Python).
  • UI/UX expertise.
  • B.Sc. or higher in Computer Science or a related field (or a very good reason for not having one).


What do we offer?

  • Work in a highly diverse and fast-paced international environment
  • Generous education budget for conferences, classes, literature or studies
  • Equipment of your choice while working on the latest tech
  • Cosy work environment in our office located in Ljubljana’s city center
  • Highly competitive base salary and quarterly bonuses for performance
  • A fridge and shelves that are always full of cold drinks, fresh fruit, snacks and chocolates
  • Weekly breakfasts, smoothies and quarterly massages on sight accompanied with bi-monthly activities 


What does Celtra do?

  • Celtra is one of the fastest growing companies in mobile advertising today. AdCreator, our award-winning platform for creating, serving and analysing mobile ads is powering 5000+ brands such as Uber, Netflix, Coca Cola, AT&T, Kraft, P&G, Nike, Intel and many others.

Recent Openings