AppSec Engineer
- Level
- Mid
- Work type
- Remote · US only
Not stated in the posting: salary, visa.
Open. First seen 6 November 2026.
About the role
We're looking for a hands-on Cyber Security Engineer to sit at the intersection of AI-driven tooling and real-world security research. In this role, you'll own the end-to-end triage and validation lifecycle for vulnerability reports generated by our AI-powered static analysis platform, separating true positives from noise, writing proof-of-concept exploits, and reporting vulnerabilities upstream to the appropriate vendor.
This is a deeply technical role built for someone who thinks like an attacker, thrives in ambiguous environments, and has a track record of finding and exploiting vulnerabilities.
What You'll Do
- Triage and validate vulnerability reports produced by our AI static analysis tool, verifying severity, exploitability, and business impact
- Write proof-of-concept exploits for critical vulnerabilities to confirm true positives
- Analyze false positives to identify patterns and provide structured feedback to engineering
- Author detailed vulnerability reports that will be submitted to upstream vendors and open source projects
What We're Looking For
- Experience in a security engineering, vulnerability research, or penetration testing role
- Demonstrated CTF experience through participation in competitive CTFs (e.g. DEFCON, PlaidCTF) with writeups
- Hands-on real-world vulnerability research and exploitation experience is preferred
- Proficiency reading and auditing code across multiple programming languages
- Prior bug bounty participation is preferred
- Based in US or Canada
The team: Engineering HIRES STEADILY
This role is one of 6 open in Engineering. 2 were posted in the last 30 days and the oldest in June: a team that hires all year rather than one being built.
WHAT THE TEAM WORKS WITH, ACROSS ITS POSTINGS
Cybersecurity (6 of 6), Penetration Testing (6 of 6), LLM (4 of 6), Python (4 of 6), Android (2 of 6), CI/CD (2 of 6), Docker (2 of 6)
OTHER ROLES ON THIS TEAM
- Senior Software Engineer, Mobile Security Analysis posted Oct 15
- Senior Software Engineer, Mobile Security Analysis posted Oct 15
- AppSec Engineer posted Jun 5
- Backend Software Engineer posted Jun 4
- Backend Software Engineer posted Jun 4
From the team and dates on Theori's own job board.
Other openings for this role
2 open postings for this role in United States, first posted 3 October 2026. The company is likely hiring for more than one position. None has been taken down and posted again.
- 6 November 2026 – open (this posting)
- 3 October 2026 – open
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