Senior Software Engineer / Tech Lead

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RTB House is seeking Senior Engineers for its Bidding Platform organization, which processes over 20 million requests per second for real-time ad auctions globally. The role involves designing and leading system changes for high performance, scalability, and observability, developing tools to improve user performance metrics, and implementing, testing, deploying, monitoring, and maintaining HTTP/gRPC services and batch jobs in Java and Python. Candidates must have deep technical expertise in complex IT systems, internet protocols, concurrent programming, distributed systems, production system monitoring, performance analysis, and knowledge of high scalability and availability. C1 level English and Polish required. Experience in AdTech/Real Time Bidding and Real User Monitoring systems is a plus. Technologies used include Java, Python, Aerospike, Memcached, Google Cloud Platform, BigQuery, MinIO, Kafka, Clickhouse, PostgreSQL, Elasticsearch, Kubernetes, Prometheus, Jenkins, and Graphite. The position offers remote work or office locations in Warsaw or Cracow, cooperation on a B2B contract, and a focus on high code quality and interdisciplinary teamwork.