Security Systems Software Engineer: LLVM, Firmware & Fuzzing

Ascendion

Redmond (WA)

On-site

USD 166,000 - 172,000

Full time

14 days+

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Benefits offered by this job

Medical insurance

Dental insurance

Vision insurance

401(k) retirement plan

Paid time off

Job summary

Ascendion is seeking a Software Design Engineer 4 in Redmond to build and enhance AI-driven firmware security analysis pipelines. You will develop low-level tooling in C++, Python, and LLVM, transform firmware into analyzable LLVM IR, and improve fuzzing workflows.

Collaboration across security researchers, compiler engineers, and leadership will drive open-source readiness and production-grade tooling. The role focuses on LLVM transformations, fuzzing integration, crash triage, and automation

Qualifications

Bachelor's degree in Computer Science, Computer Engineering, or equivalent.
Strong experience developing software in C/C++.
Hands-on experience with compiler technologies, LLVM, or low-level systems programming.
Experience with fuzzing frameworks (libFuzzer, AFL, AFL++) and security tooling.
Proficiency with Python for automation and tooling.

Responsibilities

Build and enhance security analysis pipelines.
Develop preprocessing pipelines that convert firmware/C/C++ to LLVM IR.
Implement LLVM-based transformations for off-target analysis and fuzzing.
Create and refine code-analysis workflows, including call-graph extraction and metadata generation.
Design and maintain fuzzing campaigns using modern frameworks and AI-assisted techniques.
Improve crash triage and automate analysis of security findings.
Contribute to open-source readiness, documentation, and CI/CD automation.