SingleStore (formerly MemSQL) is a real-time HTAP database — combines transactional and analytical workloads in a distributed, columnar-and-rowstore engine. Late-stage. The interview emphasizes deep distributed-database systems work, query optimization, and the unique architectural tradeoffs of an HTAP system.
Process
Recruiter screen → 60-minute coding (C++ or Go for engine roles, Python for tools) → onsite virtual: 2 coding, 1 system design (distributed-systems-flavored), 1 craft deep-dive, 1 behavioral. Cycle: 4–6 weeks.
What they actually ask
- Design a sharded distributed SQL engine with rowstore and columnstore
- Design a query optimizer that picks across storage formats
- Design a real-time ingestion pipeline (Kafka → SingleStore)
- Coding: medium-hard DSA, often with concurrency or systems framing
- Behavioral: ownership, deep technical taste, distributed-systems craft
Levels and comp (2026)
- SE: $175K–$235K total
- Senior SE: $250K–$345K total
- Staff: $360K–$485K total
- Principal: $495K–$670K total
Prep priorities
- Be fluent in C++ (the engine) and SQL deeply
- Understand distributed query execution, sharding, replication (Raft)
- Brush up on columnar storage, vectorized execution, and query optimization
Frequently Asked Questions
Is SingleStore remote-friendly?
Hubs in San Francisco (HQ), Seattle, Portugal, India. Many engineering roles fully remote within supported geographies.
How does SingleStore compare to Snowflake, ClickHouse, or CockroachDB?
Snowflake is analytical-only at scale. ClickHouse is open-source columnar-focused. Cockroach is OLTP-focused distributed SQL. SingleStore differentiates on HTAP — real-time read+write at scale. Comp competitive for senior+ database systems work.
What is the engineering culture?
Senior-heavy, technically deep, calmer pace. Strong distributed-systems craft.