Software Developer - AI & Analytics Team

Ever wonder how Spotify creates ads that look as stunning in English as in Arabic? How Adidas generates beautifully crafted dynamic creatives for tens of thousands of products? Or how Warner Bros shows billions of ads across the globe on mobile phones, websites, and even TV within milliseconds? The software we create here at Celtra makes this as easy as pie, and we need your help!

Join us as a Software Developer building AI-powered features, designed to streamline creative processes, as well as develop and enhance machine learning models that boost client's ad performance on the Celtra platform. 

With prior knowledge of machine learning, this role will primarily focus on implementing and integrating cutting-edge AI models into real-world applications. It involves working with bleeding-edge technologies, fine-tuning models to improve performance, and developing features powered by these models. You’ll also work closely with underlying data sources—exploring and understanding database structures and content to effectively support model development and feature implementation. While not the core focus,  a solid understanding of working with data at this level will be key to succeeding in the role. The role also involves ongoing research and staying current with the latest advancements in the field.

What Kind of Tech Stack Do We Use?

On the backend, you can find Scala, NodeJS, PHP, MySQL, Spark, Snowflake, and also MongoDB, Kinesis. On the frontend, we use Vue.js, Typescript and Vanilla JS when needed. Everything runs on the AWS cloud, and the ECS cluster orchestrates it. We also love CI/CD, IaC and do daily deployments to ensure your contributions see the light of day as soon as the QA team is happy.

We also actively embrace AI-assisted development with Cursor to boost productivity, iterate on PoCs and explore new ways of building software.

Your responsibilities:

• Analysing advertisement data to get a deeper understanding of peculiar details.
• Conducting research, innovating and implementing cutting-edge AI models.
• Preparing clear and concise tech specs for complex features.
• Driving a full product cycle for features and improvements.
• Optimizing architecture for maintainability, composability, etc.

You will thrive in this position if you have: 

• At least 2-4 years of experience in a similar position, programming and following modern software development processes.
• Experience with modern web technologies (Javascript, TypeScript, CSS, HTML) and frameworks (VueJS / React / Angular).
• Experience with back-end technologies (PHP / Node.js, etc.).
• Experience with Python programming
• Have a genuine interest in AI/ML (models, agents, …) and exploring new technologies.
• Be proactive, analytical, a good communicator and a team player.
• Have a product mindset.

Why Celtra?

• Impact: Shape the future of creative and help solve some of the biggest challenges ad tech is facing today.
• Culture: We’re bold, collaborative, and proudly a little bit quirky - because doing great work should also be fun.
• Growth: Work with some of the sharpest minds in creative tech, tackle new challenges, and grow faster than you thought possible.

What do we offer?

• Hybrid working. You can choose to work from home or join us in our Ljubljana office.
• Flexible schedule. You’re trusted to create the right conditions for your best productivity.
• Continuous education. Up to 1000 EUR per year for conferences, books, and courses of your choice.
• Equipment of your choice.
• Knowledge shares. 
• Additional pension and health insurance.
• WFH budget. An additional budget of 500 EUR to set up your home space.
• Employee well-being. Dedicated budget for any kind of wellness activities such as fitness, yoga, etc.

About Celtra

Celtra helps enterprise advertisers, media, and agencies design, approve, and deliver digital creative across the ever-growing number of campaigns, markets, designs, and variants. Celtra’s Creative Automation & Enablement Software for helps brands move faster than ever while dramatically scaling content production. Companies like adidas, TripAdvisor, Spotify, Unilever, NBCU, Lululemon, YETI, Vice, and hundreds more partner with Celtra to cut production costs while increasing efficiencies and output in the cloud.

Empowering Creativity through Diversity & Inclusion

Our mission is to empower creativity - and we cannot fulfill our mission without different perspectives. Diversity drives innovation, and Celtra is committed to diversity, equity, inclusion, and belonging. 

Every employee is empowered at Celtra - no matter your race, age, religion, gender identity, sexual orientation, physical or mental ability, or ethnicity.  We hire the best, and develop our teams through continuous education and mentorship, in a community where everyone can bring their whole selves to work.

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