QuestDB (YC S20) — High-performance time series database
QuestDB is a high-performance open source database for the most demanding workloads. Native support for Parquet, Iceberg and SQL keeps your data portable, AI-ready, without vendor lock-in.
QuestDB is a Y Combinator company in the Summer 2020 batch. Its directory entry describes it as: High-performance time series database. The founders listed are Nicolas Hourcard (Founder), Tancrede Collard (Founder), Vlad Ilyushchenko (Founder) (Y Combinator directory entry, July 2, 2020).
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QuestDB is a high-performance open source database for the most demanding workloads. Native support for Parquet, Iceberg and SQL keeps your data portable, AI-ready, without vendor lock-in.
QuestDB is designed from the ground up to operate as close to the hardware as possible - eliminating ingestion bottlenecks and lowering overall hardware requirements.
QuestDB powers mission-critical infrastructure for companies in Capital Markets, Crypto, Space Exploration, Energy and Robotics/Physical AI.
Nicolas Hourcard
Founder
Tancrede Collard
Founder
Vlad Ilyushchenko
Founder
Founders, titles and bios as the company published them. Photographs are our own copies of the ones on that record, so they do not break when the original link expires.
One of 338 companies held here in B2B › Infrastructure.
No investor is drawn from a Form D — the form states how many invested and never who. The one investor on this graph is named because a batch has exactly one.
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Example from a real report (our sample on Target): “In March 2026, Target announced a planned incremental $1 billion operating investment” Source: Target Corporation (press release)
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The Short Answer
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Who Runs It, And How To Reach Them
The Money: Funding, Valuation, Runway
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Warning Bells
Sources
1 cited source found
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