Location: Poland We Are: RTB House is a next-generation performance demand-side platform (DSP) that uses proprietary Deep Learning AI algorithms to help brands grow. The company is the market leader in driving performance using Deep Learning across the entire purchase funnel. Founded in 2012, and now operating in 90+ markets, RTB House has always been private-by-design. It embraces first-party advertising and a relentless approach to innovation. RTB House offers end-to-end Deep Learning-powered AdTech products and solutions to maximize conversion, drive new customer acquisition, create engagement, and fuel long-term demand for a global base of clients. As a Senior TypeScript Engineer, you will play a key role in designing, developing, and maintaining internal tools and libraries that support our teams across the organization. You will have the opportunity to work with the latest frameworks and libraries, shape the tech stack for each project, and tackle complex development challenges that require creativity and innovation. You Will: Develop and maintain internal tools using a variety of technologies. Build web applications (TypeScript) that support team workflows. Design, develop, and maintain internal TypeScript libraries. Select and adapt the most suitable libraries and frameworks for each project. Solve complex development challenges with a creative, problem-solving approach. Desired Experience: Strong knowledge of TypeScript and Node.js. Experience with NestJS. Hands-on experience with React / Next.js. Experience with Google Cloud Platform (GCP). Experience with Docker. Minimum of 5 years of professional experience with the above technologies. Knowledge of OOP principles, clean code, and clean architecture. Familiarity with design patterns and the ability to apply them. Experience in writing unit tests and end-to-end tests. Very good knowledge of Git and Linux. Solid understanding of SQL. Communicative level of English. Independence, proactivity, and eagerness to learn and grow. Nice to Have: Knowledge of Google Analytics or Google Tag Manager. Previous experience in the AdTech/Advertising industry. We Offer: The opportunity to contribute to one of the most exciting online projects in Poland with global reach. Hands-on experience in RTB, the fastest-growing and most innovative area of online advertising. Development-focused tasks and a strong emphasis on continuous learning and skill improvement. Apply now! You don't need to tick every box to apply. If you are passionate about digital marketing, send us your CV, and we'll review it.