Frontend Software Developer

Ljubljana, Slovenia | Product Development | Full-time


We are looking for Frontend Software Developer who will develop and maintain a web framework responsible for ad loading, ad lifecycle management and event tracking with a focus on performance optimization and cross platform support (desktop browsers, mobile browsers, in-app browsers, …).

A bit about our stack 

  • Running completely on AWS
  • Frontend: Vanilla Javascript, Vue.js
  • Backend: PHP, Scala, Go, Python
  • Data: MySQL (RDS), Spark, Snowflake, Databricks, DynamoDB, MongoDB
  • Provisioning & orchestration: Kubernetes, Docker
  • Other Technologies: Video tools, CloudFormation, S3, ELB, SNS, SQS, Kinesis, Bazel, Airflow


What do we expect:

  • Good knowledge of modern web technologies with focus on Vanilla JavaScript, CSS and HTML
  • Understanding of various software paradigms and architecture styles (REST, OOP, MVC, ORM, etc)
  • Experience with Web Development for Mobile Devices
  • Experience with relational databases
  • Good understanding of modern software development processes
  • Fluent written and spoken English - you will be using it every day
  • Dedication to learn and improve
  • Dedication to product quality and attention to detail
  • Persistence - It is not uncommon to find no answers on stackoverflow for some of the problems we encounter
  • Ability to work fluently in a team and reaching out to other teams is not a proble

What brings extra points:

  • Knowledge on backend technologies and principles (scaling, concurrency, etc.)
  • Experience with TDD & CI
  • Experience with SumoLogic, Databricks and Snowflake
  • Experience with CLI video & image tools
  • UI/UX expertise


About Celtra

We are a hi-growth AdTech company with 180+ employees around the globe with offices in Boston, New York, San Francisco, London, Ljubljana and Singapore. Celtra is self-service enterprise software for automating and scaling creative production. Celtra enables creative and marketing teams to design, approve, and deliver digital creative across the ever growing number of channels, ad formats, variations, and markets. Companies like VICE, Unilever, Lululemon, CNN, and Hearst partner with Celtra to cut production costs while increasing efficiencies and output in the cloud.

Here it’s all about looking beyond the surface, beyond the numbers, and really trying to see the qualities that are at the core of the person, their talents; the discovered ones or better still, the undefined ones. We look for people who naturally want to take responsibility for their own success, and strive to do something that has a tangible impact. To our best talent, we give the freedom to do the unusual.

We take good care of our people. 

  • We offer a competitive benefits and compensation package
  • We place great importance on the professional development of our employees 
  • We provide employees with top notch working equipment 
  • We provide work-life benefits that allow flexibility at different stages of life
  • We offer a dynamic workplace and quality working conditions 
  • We provide plenty of opportunities for employees seeking a more active lifestyle