Core Software Engineer (C++) - Remote

Responsibilities

• Contribute to, analyze, and optimize the performance of the core ClickHouse database, including query optimization, distributed query optimization, relational operators (aggregation and joins), caching, and low-level optimizations like SIMD instructions.
• Ensure database performance does not deteriorate by extending existing and adding new performance tests using real-world or synthetic datasets.
• Serve as a resource for the Support Engineering team, debugging advanced performance issues, including on-call rotation and participation in external community support channels.
• Collaborate with other teams to assess impact of new features on performance and reliability.
• Work with open-source community: resolve issues, review and finish PRs, answer questions in mail, chats, Google groups, external Slack channels.

Requirements

• Solid professional software development experience in C++, including experience with Unix/Linux systems.
• Strong knowledge in database internals and design.
• Experience in performance engineering (ideally databases; also high-frequency trading, simulation, real-time data processing).
• Strong production debugging skills.
• Excellent communication and collaboration across engineering teams.
• Passion for efficiency, availability, scalability, and data governance.
• Ability to thrive in fast-paced startup environment with high responsibility and ownership.

Nice-to-haves

• Experience with ClickHouse.
• Experience in security, privacy, and compliance.
• Experience with TCP/IP and network programming.
• Experience developing cloud infrastructure services, preferably with Kubernetes.
• Experience giving public talks at technical conferences and meetups.
• Previous contributions to open source projects.