Software Developer Intern

Please note that a valid student status in Slovenia is required for this position. At Celtra, we are leading a creative revolution. In a world where digital content consumption is skyrocketing and audience expectations evolve daily, traditional production models can no longer keep up - and that is where we come in. Our creative solutions help media owners and operators monetize inventory more effectively, bridge the creative supply gap for brands and agencies, and deliver faster, smarter, and more personalized experiences. We are not just keeping up with industry shifts - we are setting the pace. Now, we are looking for a Software Developer Intern who will have an opportunity to work on our products, used by top companies and thousands of people on a daily basis. You will be joining one of our cross-functional teams and, with the support of our mentors, you will get your hands dirty by working on some interesting projects. 1. What tools 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. 2. Your responsibilities: - Developing frontend and backend of our products that are used by top companies and thousands of people on a daily basis. - On the frontend you will be implementing rich experiences in our apps, participating in revamping the client-side architecture and general redesign of the product frontend. - On the backend you will mainly work on our APIs (REST, web sockets) and family of background jobs. - Making sure we maintain a high level of quality by writing automated tests. Qualifications: - Understanding of RESTful API architecture. - Knowledge of HTML5 and CSS. - Knowledge of JavaScript. - Knowledge of at least 1 backend programming language (Python, PHP, Ruby, Java, Go, Scala etc.). - Good verbal and written English communication skills. - Willingness to constantly learn and improve. - Team player. - Active student status in Slovenia. 1. Why Celtra? - Impact: Help shape products used by leading media companies and publishers across the globe. - Culture: We are inventive, collaborative, and proudly a little bit quirky - because doing great work should also be fun. - Flexibility: Hybrid with strong hubs in Ljubljana and New York, and team get-togethers that keep us connected. - Growth: You will learn from experienced product managers, engineers, and designers - and grow into bigger roles as you go. 2. What do we offer? - Buddy and mentor that will help you grow professionally, plus a well structured development plan. - Hybrid working. You can choose to work from home or join us in our Ljubljana office. - Flexible working hours. - Top-notch working equipment. - We have fun. We organise regular team & company events. - Free breakfasts & beverages available in the office. Apply here: https://celtra.com/careers/openings/#op-421095-software-developer-intern-