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Senior ClickHouse Engineer

2 weeks ago

Sweden Moralis Full time
About Moralis

Moralis is redefining how businesses access blockchain data. Our APIs, streaming tools, and multi-chain integrations help developers and enterprises build Web3 applications faster, cheaper, and at scale. We're a lean, global team with a big mission: to become the go-to data layer for the decentralized internet.

Role Overview

We're looking for a dedicated and experienced ClickHouse DBA to take full ownership of our analytical database infrastructure. As more of our product shifts to ClickHouse, we need a specialist who can keep our clusters fast, reliable, and cost-efficient. You'll partner closely with our backend and infra teams, enabling them to move faster while ensuring the database remains rock solid.

What You'll Do

Cluster Operations

  • Manage and scale ClickHouse clusters (replication, sharding, distributed tables).
  • Handle schema evolution, partitioning strategies, and TTLs.
  • Maintain data consistency across replicas and shards.
  • Plan and execute upgrades with zero or minimal downtime.

Performance & Optimization

  • Profile and optimize heavy queries and table engines.
  • Tune key configs (max_threads, max_memory_usage, merge settings, I/O schedulers).
  • Benchmark cluster performance (ingest throughput, query latency, merge rate).
  • Work with engineers to optimize schema and query patterns.

Monitoring & Reliability

  • Maintain observability stack: Prometheus, Grafana, and system logs.
  • Set up alerting on query performance, merges, replicas, and disk usage.
  • Own backup and restore processes (S3, NFS, or local snapshots).
  • Test and document disaster recovery scenarios.
What We're Looking For
  • 2+ years hands-on ClickHouse experience and 4+ years working as a DBA with distributed or analytical databases.
  • Strong understanding of replication, partitioning, and distributed table design.
  • Experience with performance tuning and large-scale OLAP workloads.
  • Familiarity with observability stacks (Prometheus/Grafana).
  • Hands-on experience managing production clusters with high uptime requirements.
  • Comfortable taking full ownership of mission-critical systems.
Nice-to-Have
  • Experience with multi-cluster or cross-region setups.
  • Familiarity with ClickHouse Cloud or Altinity.Cloud.
  • Experience using S3/object storage as part of a ClickHouse deployment.
  • Background in Druid, Pinot, BigQuery, Snowflake, or similar OLAP systems.
  • Contributions to ClickHouse open source.
Who You Are
  • Deeply detail-oriented and passionate about performance and reliability.
  • Comfortable working remotely and asynchronously in a fast-paced environment.
  • Proactive about improving infrastructure, automation, and data quality.
  • Excited to work in the Web3/data space and learn new technologies.
What We Offer
  • Compensation: Competitive part-time engagement with flexible hours and the ability to convert to full-time as the role evolves.
  • Ownership: You'll own our ClickHouse infrastructure end-to-end.
  • Culture: Remote-first, async-friendly, and product-led team distributed across Europe and beyond.