What does the Engineering hiring burst signal mean?

The Engineering hiring burst signal indicates a specific pattern of engineering acceleration. Full classification logic and the four-signal taxonomy are documented at /methodology and /signals.

Where can I find PostHog's historical signal data across periods?

The startup hub at /startup/posthog consolidates every period of historical signal data for PostHog, including commit-velocity change, contributor growth, and signal classification. The free /api/signals.json endpoint exposes the same data for programmatic access.

Q4 2025 · Historical Snapshot

PostHog — Q4 2025 Engineering Signal

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Signal — Q4 2025

In Q4 2025, PostHog showed +11% commit velocity change with 100 active contributors (+60% growth). Signal type: Engineering hiring burst. 6 new repositories created in the 30 days preceding this period. Ranked #16 of 32 in Data Infrastructure for Q4 2025.

Metrics — Q4 2025

Commit Velocity (14d)

746

Velocity Change

+11%

Contributors

100

+60% growth

New Repos (30d)

Context

Sector: Data Infrastructure (full Q4 2025 ranking)

Stage at time of snapshot: Growth

Geography: US

Signal classification: Engineering hiring burst — learn what this signal means

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Metrics — Q4 2025

Context

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Metrics — Q4 2025

Context

See PostHog's current signal