About the role
Summary
We're looking for an experienced Senior Software Engineer to help build the next generation of AI-driven security analysis at Theori. You'll play a key role in designing and implementing analysis capabilities that power Xint, our autonomous penetration testing framework, with a focus on mobile applications.
This is a foundational role on our US engineering team, ideal for someone with a reverse engineering background who wants to turn hands-on security research into automated systems. The work spans commercial products and U.S. government research efforts.
Key Responsibilities
- Design, develop, and maintain analysis capabilities that power Theori's AI security platforms.
- Build static and binary analysis tooling in Python on top of established reverse engineering frameworks.
- Develop instrumentation and test infrastructure for evaluating applications on real devices.
- Work with security researchers to turn manual techniques into automated, repeatable analysis.
- Measure and improve analysis quality against real-world targets.
- Write clean, well-tested, and maintainable code in Python and related technologies.
- Document and present technical results to customers and internal stakeholders.
Requirements
- 5+ years of professional software engineering experience building production systems.
- Strong proficiency in Python.
- Experience with reverse engineering tools such as Binary Ninja, IDA Pro, or Ghidra.
- Solid understanding of mobile platform internals, Android, iOS, or both.
- Familiarity with program analysis concepts such as control flow, data flow, and taint tracking.
- Self-directed, ownership-oriented, and comfortable driving projects from design to deploymen
- U.S. citizenship.
- Based in, or willing to relocate to, the Washington, DC metro area. The role is remote day-to-day, with periodic on-site work at client facilities in the DC area.
Nice to Have
- Experience with dynamic instrumentation tools such as Frida.
- Background in vulnerability research, including published CVEs.
- Experience with fuzzing.
- Familiarity with AI/LLM-driven workflows.
- Prior work on government-funded research programs.
- CTF experience.
- Active TS/SCI clearance.
What We Offer
Compensation & Benefits
- Competitive salary + equity
- Health, dental, and vision insurance
- Generous PTO policy
- Remote work (DC metro based)[2] [3]
- Laptop + home office stipend
- 401(k) match
Team Culture
- Ship features that matter
- Modern Python-based stack
- Strong focus on testing and quality
- Clear documentation and processes
- Collaborative, low-ego team
- Career growth and mentorship
Work-Life Balance
- Flexible hours, remote-first[4] cultureremote with occasional client-site days
- No on-call rotations or weekend deployments
- Focus on outcomes, not hours
Why Join Theori?
- Cutting-edge product: AI-driven security tools that protect real systems
- Smart team: Collaborate with world-class engineers and security researchers
- Growth stage: Join early and help define the culture of our North American team
- Real impact: Shape how AI transforms cybersecurity
Hiring Process
- 30-min intro call with hiring manager
- 60-min technical interview
- Offer