The problem
Complex distributed systems fail in ways traditional tests miss
What they do
Deterministic simulation testing that finds and reproduces deep software bugs
Traction ~40 clients incl. Jane Street, Ethereum
Hiring trend
- Open roles
- 22
- Ops roles
- 2
- Headcount
- ~91
~91 staff; 24 open roles
Hiring in
- Vienna
- London
- San Francisco
- Remote (Japan)
Funding
- Last round
- $105M
- Stage
- Series A
- Date
- Dec 2025
Led by Jane Street
- Hiring+1.522 open roles on the live job board (10–29 roles = +1.5)
- Funding recency+1.5Series A · $105M, Dec 2025 (10 months ago): 6–12 months = +1, $100M+ round +0.5
- Traction+0.75Some growth: ~40 clients incl. Jane Street, Ethereum
- Red flags0None found in the last 24 months
- Total3.751.5 + 1.5 + 0.75 − 0 = 3.75 → Tempo (3.5–4.24)
Distance (Half) is a separate read on how long the lead can last. It doesn't change the score.
Distance
Half · edge: hard to leave
Created deterministic simulation testing; relied on by Jane Street and Ethereum, ~40 clients.
Sources: PR Newswire: Jane Street leads Antithesis $105M Series A (Dec 2025) ↗
Last checked Oct 25, 2026