# Silmaril

[Silmaril on Hacklab](https://hacklab.so/org/silmaril)

Startup · 2 people on Hacklab

## Links

- [Website](https://silmaril.dev/)
- [Y Combinator](https://www.ycombinator.com/companies/silmaril)
- [LinkedIn](https://www.linkedin.com/company/silmarilsecurity)
- [X](https://x.com/Silmarildev)

## About

<!-- 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 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](https://www.linkedin.com/in/aum-upadhyay-517016269/) · [X](https://x.com/aumup001)

### 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.

[LinkedIn](https://www.linkedin.com/in/eduardo-velasco-b10ba826b/) · [X](https://x.com/EduardoVel36291)

[Source: Y Combinator](https://www.ycombinator.com/companies/silmaril) · Retrieved 2026-11-02. Company information is self-reported on YC.

## Current staff

- [Aum Upadhyay](https://hacklab.so/aum-upadhyay) — Founder/CEO (Present)
- [Eduardo Velasco](https://hacklab.so/eduardo-velasco) — Founder/CTO (Present)