Silmaril

<!-- hacklab:yc-profile -- YC company profile Security for agents that self-improves Silmaril is the first security for agents that self-improves. It understands application con…

Website

About Silmaril

YC company profile

Security for agents that self-improves

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.

YC batch: Spring 2026
Founded: 2026
Team size: 2
Location: San Francisco
Country: US
Status: Active
Industry: B2B
Stage: Early
YC partner: Garry Tan

Founders

Aum Upadhyay — Founder/CEO

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.

LinkedIn · X

Eduardo Velasco — Founder/CTO

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.