Full Stack Software Engineer (various levels) - Review team

Ljubljana, Slovenia | Engineering | Full-time | Fully remote


We are looking for Fullstack software engineers (various levels) with an appreciation for Frontend technologies to join the journey of building the Creative Automation team (CA).

What is our team responsible for? 

Our clients are running global campaigns with 10k+ ads making it impossible to review and discuss ads one by one. Our team is making collaboration at scale possible with our purpose built preview tool facilitating overview of thousands of ads side-by-side, search capabilities, real-time commenting, annotations, and by tapping into existing communication channels such as Slack. 

In the past we built 

  • Real-time collaborative commenting (like Google Docs)
  • A pin dropping to mark specific ad details.
  • High-performance infinite scroll of thousands of ads.
  • Google Doc like sharing capabilities.

What are the challenges ahead?  

  • Alternative ad overview layouts (grouping, sampling)
  • Integrating with existing client workflows - Slack app
  • Ad approvals
  • Comments with emojis and reactions 
  • Continues scalability improvements both on backend and frontend
  • Notifications pipeline revamp

What kind of tech stack do we use?

Our CA product is using NodeJs, PHP, MySQL, Redis and Python. For both products, on the front-end, we use Vue.js, NPM, Webpack and vanilla JavaScript when needed. Everything runs on the AWS cloud, and the Kubernetes cluster orchestrates it.

 What would be your responsibilities? 

  • Create performant interfaces that are a joy to use
  • Contribute to the technical direction of our modules, define them and execute on them
  • Help define and improve the architecture
  • Code, review other people's code, ensure code quality, be a good boy scout, etc..
  • Work with the Products, Customer support, and other internal teams to solve challenges
  • Teach and help junior/mid-level developers grow
  • Help plan and transfer old parts of the codebase to the state of the art


  • 3+ years of experience in programming and following modern software development processes. 
  • Have experience of building single-page applications using modern web technologies (Javascript / TypeScript / CSS / HTML) and frameworks (VueJS / React / Angular).
  • Have experience with server-side principles (scaling, concurrency, etc. and back-end technologies (PHP, Python, Golang, Ruby, etc.).
  • Have understanding and experience of relational databases (e.g., MySQL) or document databases (e.g., Mongo).
  • Have experience with writing a unit, integration, and end-to-end tests. 
  • Willingness to learn, sharing our passion for constant improvement 
  • Experience with complex business software and large codebases
  • Experience with developing and deploying performant frontend code
  • Show passion for learning, and help us learn too.
  • Be fluent in written and spoken English.

We appreciate:

  • Experience with TDD & CI 
  • A big plus is some interest in or experience with UX/UI
  • Understanding of various software paradigms and architecture styles (REST, OOP, functional programming, state management, etc.)
  • B.Sc. or higher in Computer Science or a related field  
  • Be open to collaborating in the tech community 

What do we offer? 

  • Competitive salary.
  • Unlimited remote working. You can choose to work from home indefinitely or join us in our Ljubljana office whenever you feel like it.
  • Flexible hours and work-life balance. We focus on results rather than schedules.
  • Professional growth. Up to €5.000 per year for conferences, books and trainings of your choice.
  • Top-notch working equipment.
  • Additional budget of 500 EUR for your home office equipment.
  • Health and pension coverage. We offer comprehensive health coverage and additional pension insurance up to 5,8% of your annual salary.
  • We have fun. We organise regular team & company events.
  • Employee well-being. Dedicated budget for any kind of sport activities such as fitness, yoga lessons, etc.
  • Free breakfasts & beverages available in the office.

About Celtra

At Celtra, we are building two world-class products. The first product (Creative Enablement or CE) has already been a growing market leader for a couple of years now, helping companies such as CNN, TripAdvisor, Bloomberg, NBCU, and Business Insider monetize their advertising inventory. It covers the entire lifecycle of launching a campaign: ad product ideation and design, ad content production, trafficking tags, and tracking performance. With our second, younger product (Creative Automation or CA), we are chasing a much bigger opportunity by helping brands produce a massive amount of content better, faster, and more efficiently. Although its development is still in the early days, it already includes an impressive list of customers such as Spotify, adidas, Shopify, Unilever, P&G, LEGO, Lululemon, and many others.