Silmaril

Security for agents that self-improves

y-combinatorSpring 2026🇺🇸 San Francisco2 people

silmaril.dev in LinkedIn 𝕏 Twitter

Aum Upadhyay, Eduardo Velasco · 2 co-founders

2026Founded

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Profile coverage4 of 8 · missing Funding, Signals, Customers, Stack / tools · last run 8/8/2026

About

Silmaril is the first security for agents that self-improves. It understands application context to block 2x as many threats as current SOTA defenses with 10x lower latency. Customers plug us into agentic frameworks like LangGraph with 5 lines of code. Silmaril has stopped $28M of damages for customers.

2 founders

Aum Upadhyay

Founder

Co-Founder & CEO at Silmaril. I built the security and privacy framework at AWS that prevented over $1.8B in damages. Now I bring that same defensive mindset to Silmaril, working with customers to ship prompt injection defense.

in LinkedIn 𝕏 @aumup001

Eduardo Velasco

Founder

Co-Founder & CTO at Silmaril. I prove the risks are real by finding exploits myself. I chained a prompt injection into root access inside ChatGPT. Ex-Amazon tech lead specializing in low latency ML models that generated $400M in annual revenue.

in LinkedIn 𝕏 @EduardoVel36291