Composal
<!-- hacklab:yc-profile -- YC company profile Swarms of agents acting like users to find bugs before release Check features, not code. Composal sends a swarm of agents to use yo…
About Composal
YC company profile
Swarms of agents acting like users to find bugs before release
Check features, not code. Composal sends a swarm of agents to use your product like your users do. They test real flows and edge cases to show you what works, what breaks, and if it’s ready to ship.
- YC batch: Fall 2026
- Founded: 2026
- Team size: 3
- Location: London, United Kingdom
- Country: GB
- Status: Active
- Industry: B2B
- Stage: Early
- Tags: Developer Tools, DevSecOps, Cloud Computing, AI
- YC partner: Pete Koomen
Founders
Pandelis Zembashis — Founder/CEO
I'm co-founder and CEO of Composal. We help engineering teams continually test and validate what they build: our agents use the product, check real user flows and discover bugs before release. Previously, as CTO at Cosine, I built AI coding agents and the infrastructure behind them, including one of the first CLI harnesses, sandboxed execution from scratch and large-scale repository mirroring for data generation and model training. Now I help teams validate software at scale.
Jonathan Davies — Founder/CTO
Co-Founder and CTO of Composal. Previously Senior Software Engineer at PapayaDash. Before that built software for Telefonica, Mitie, and Vodafone
Jan Moehlmann — Founder
Founder at composal.ai (YC F26). Previously built commercial functions at 11x, Encord, Tractable
Source: Y Combinator · Retrieved 2026-11-02. Company information is self-reported on YC.