At Celtra, data is an important part of the products we build. We ingest and transform data from a range of internal and external sources and use it to power analytical features, APIs, and increasingly AI-powered experiences for our users. We are looking for a Software Developer, Data to join our product engineering team. This is a software engineering role focused on building product-facing data systems and features end to end - from understanding and modeling the data to pipelines, backend services, and user-facing experiences. You will work across the stack, own features through production, and help us build reliable and maintainable systems that turn data into useful product capabilities. What tools do we use? Our data platform is centered around Snowflake and dbt, with Fivetran and custom integrations handling data ingestion. We use Terraform for infrastructure as code and CI/CD extensively to automate testing and delivery. Our application stack is built primarily with TypeScript, with Vue.js on the frontend. The team also builds backend services, analytical APIs, workers, and orchestration infrastructure. AI is also part of how we build software. We have an AI-assisted SDLC in place where engineers orchestrate coding agents to offload repetitive and tedious work, while staying responsible for technical decisions, quality, and outcomes. 1. Your Responsibilities - Own and build product features end to end, working across data pipelines, backend services, and frontend when needed, and taking them through to production. - Understand the data and its sources, and design and evolve data models that are clear, maintainable, and reusable. - Build and improve our data pipelines and infrastructure, from ingestion and transformation to orchestration, reliability, and production operation. - Build analytical APIs, services, and frontend experiences that make data available to our products and users. - Work with product stakeholders, clients, and vendors to understand needs, investigate problems, and turn them into practical technical solutions. - Contribute to the evolution of our data platform, including data quality, governance, observability, and AI-powered capabilities. 2. Qualifications - Strong SQL and data modeling skills, with experience building ETL/ELT pipelines and working with layered transformation patterns such as raw/staging, intermediate, and curated data models. - Solid software engineering fundamentals, with experience building and operating production systems and backend services. - Good understanding of software engineering practices such as automated testing, CI/CD, and production observability. - Ability to independently own and deliver moderately complex engineering work, from understanding the problem through implementation and production operation. - Good verbal and written English communication skills. 3. What brings extra points? - Hands-on experience with Snowflake, dbt, Fivetran or other ingestion frameworks, Terraform, or TypeScript. - Experience building distributed systems, asynchronous workflows, or orchestration systems. - Experience designing data quality, observability, or governance systems. - Experience building or improving development harnesses for coding agents and agentic workflows. - Experience developing AI agents or systems that provide AI applications with access to structured company data. - Familiarity with frontend frameworks such as Vue.js. 4. What we value You don't need to know every tool in our stack. What matters more is that you are curious, proactive, and motivated to grow. We value engineers who like to understand how things really work, take ownership beyond the initial implementation, and are comfortable working across different parts of the stack. You should enjoy turning ambiguous problems into practical solutions and continuously expanding what you can take on independently. 1. Why Celtra? - Impact: Create high-quality digital work for leading global brands across a wide range of campaigns and formats. - 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, London and New York, and team get-togethers that keep us connected. - Growth: You will learn from experienced team members and grow into bigger roles as you go. 2. What we offer? - Flexible working hours and hybrid work based on a fixed number of in-office days. - A dedicated educational budget to explore new skills and deepen your expertise. - 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. Apply here: https://celtra.com/careers/openings/#op-706810-software-developer-data
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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's 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're 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. 1. 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. 2. What brings extra points? - Knowledge of Vue.js. - Knowledge of global state management concepts. 1. Why Celtra? - Impact: Create high-quality digital work for leading global brands across a wide range of campaigns and formats. - 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, London and New York, and team get-togethers that keep us connected. - Growth: You will learn from experienced team members and grow into bigger roles as you go. 2. What do we offer? - A buddy and a mentor that will help you grow professionally, plus a well structured onboarding / professional development plan. - Flexible working hours and hybrid work based on a fixed number of in-office days. - Top-notch working equipment. - Regular team & company events. - Free breakfasts & beverages available in the office. Apply here: https://celtra.com/careers/openings/#op-421095-software-developer-intern-
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