Senior Distributed Systems Engineer / Tech Lead

Senior Engineers support the Bidding Platform organization, the core of the business, processing over 20 million requests per second to participate in real-time auctions and display advertisements to customers in 90+ countries. The role suits engineers who want to work on technically complex and demanding solutions.

Senior Engineers combine deep technical expertise with a strong sense of ownership and take Tech Lead roles in complex, cross-team projects.

You will

• Design and lead implementation of system changes that deliver high performance, scalability, and observability for displaying and tracking ads worldwide.
• Develop tools and optimizations to drive measurable improvements in critical user performance metrics.
• Implement, test, deploy, monitor, and maintain HTTP/gRPC services and batch jobs in Java and Python, including environment setup, configuration code, and production monitoring.
• Provide hands-on technical leadership by solving complex system challenges, participating in project planning and scoping, and ensuring high coding standards through code reviews.

Requirements

• Excellent understanding of how complex IT systems work, from hardware through software to algorithms.
• Very good knowledge of fundamental internet protocols and technologies, including DNS, HTTP, and cookies.
• Good knowledge of methods for creating concurrent programs and distributed systems, from thread level to geo-distributed clusters.
• Practical ability to observe, monitor, and analyze production systems and draw valuable conclusions.
• Ability to critically analyze solutions for performance, from theoretical performance estimation to detecting and removing production performance issues.
• General knowledge of typical problems and solutions in high-scalability and high-availability systems.
• C1-level English and Polish.

Nice to have

• Experience in AdTech/Real Time Bidding.
• Experience contributing to Real User Monitoring (RUM) systems.

Selected technologies used

• 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, with solid code reviews as standard.
• Collaboration in an interdisciplinary, self-sufficient team including DevOps, database experts, backend developers, product designers, and QA engineers.
• Hardware and software tailored to your preferences, such as a MacBook and AI tool licenses.
• Flexible working conditions with no core hours and fully remote cooperation available.