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. In 2026, RTB House launched rtb.com, a self-service platform specifically designed to allow small and medium-sized businesses and agencies to deploy auto-built creatives and maximize performance on any budget. We are looking for Engineers to support our Bidding Platform organization which is the core of the RTB business, processing over 24 million requests per second while maintaining a latency of under 50 ms to participate in real-time auctions and display advertisements to our customers. Why RTB House? If you are looking for a place where you can work on technically complex and demanding solutions, this is the opportunity for you! You Will: - Design and programming of a wide range of modules and components as part of a system that supports over 24M queries per second and low latency. - Work on the optimization of the developed software in terms of response time and resource consumption. - Ensure the reliability and scalability of the solutions built - Create performance and correctness tests for new system components - Analyse new technologies in terms of their applicability in production conditions - Develop tools for monitoring and analysing the operation of the production system - Continuous optimization of existing tools and processes Desired Experience: - Excellent understanding of how complex IT systems work (from the hardware level, through software, to algorithmics). - Proficiency in programming. - Very good knowledge of fundamental Internet protocols and technologies (DNS, HTTP, cookies and others). - Good knowledge of basic methods of creating concurrent programs and distributed systems (from thread level to continent level). - Practical ability to observe, monitor and analyse the operation of production systems (and draw valuable conclusions from it). - The ability to critically analyze the solutions created in terms of performance (from estimating the theoretical performance of the designed systems to detecting and removing actual performance problems in production). - General knowledge of issues (typical problems and methods of solving them) in the areas of 'high scalability' and 'high availability'. - C1 level in English and Polish - Background in Computer Science, Algorithmic complexity, and System Architecture (formal CS degree, competitive programming experience like OI/ICPC, or equivalent track record). Selected Technologies: - Java, Python - Aerospike, Memcached - Google Cloud Platform, BigQuery, MinIO - Kafka, Clickhouse - PostgreSQL - Elasticsearch - Kubernetes, Prometheus - Jenkins, Graphite We Offer: - Projects focused on extreme performance and high code quality – clean code and solid code reviews are our standard. - Collaboration within an interdisciplinary, self-sufficient team (including DevOps, database experts, backend developers, product designers, and QA engineers). - Access to modern technologies and the opportunity to apply them in large-scale, high-impact projects. - Cooperation based on B2B contract. - You can cooperate 100 % remotely or choose one of our office spaces in Warsaw or Cracow. 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.

Distributed Systems Engineer

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