Senior Product Security Engineer, Halcyon
$190-250k
+ 10% bonus + Equity
Cybersecurity tools to protect against ransomware
Be an early applicant
Cybersecurity tools to protect against ransomware
201-500 employees
Be an early applicant
$190-250k
+ 10% bonus + Equity
201-500 employees
Company mission
Halcyon's mission is to defeat ransomware.
Role
Who you are
- 5+ years in product security or endpoint-focused consulting, with hands-on testing of Windows-based agents or EDR/AV products
- Experience building fuzzers or integrating existing fuzzing frameworks for native code
- Experience and capability in building automated test harnesses from the ground up
- Strong Windows OS internals knowledge, especially user-mode hooking and Win32 API behaviors
- Proficient in C/C++ and Python, with solid experience calling with Windows APIs
- Experience reviewing and validating security findings
- Comfortable researching and suggesting security features end-to-end and creating technical content
Desirable
- Rust development experience, particularly around FFI or unsafe code
- Published tooling or research in vulnerability discovery, fuzzing, and/or automated test frameworks
- Hands-on experience with CI platforms (GitHub Actions, Jenkins) to automate security workflows
What the job involves
- Ligned with this mission, we’re hiring a Senior Product Security Engineer to ensure our most innovative defenses make it into every release. These cutting-edge capabilities will keep our customers ahead in the fight against ransomware
- Design and implement security test harnesses from scratch to simulate real-world ransomware behavior
- Develop and integrate fuzzers (libFuzzer, AFL/WinAFL, or custom tools) for automated crash and vulnerability discovery
- Build user-mode hooking instrumentation and explore EDR bypass techniques to exercise agent internals
- Triage, reproduce, and analyze security findings against our agent and libraries
- Perform root-cause analysis on crashes or logic flaws; build minimal PoC exploits or reproducer cases
- Deep understanding of Windows internals (ring transitions, memory management, Win32 API) with focus on user-mode security hooks
- Collaborate on driver-level or API-level integrations when necessary (no kernel-driver dev required)
- Play a critical role in developing cutting-edge ransomware protections and security features that will have a real-world impact
- Work alongside highly skilled security researchers and engineering teams building next-generation security solutions
- Have the opportunity to shape the process by which security innovations transition from research into real-world implementations
Our take
As cyber attacks become increasingly complex, especially in the mode of ransomware, companies such as Halcyon are becoming an ever more important weapon in the fight for cybersecurity. Though only formed in 2021, its founders have extensive experience as researchers at cybersecurity unicorn Cylance, amongst other notable companies in the sector.
Halcyon’s product stands out from similar - and abundant - offerings thanks to its melding of multi-proprietary advanced prevention engines and AI models designed specifically to seek out and destroy ransomware threats. It's the flexibility and reactivity of these two multi-tiered facets that have made Halcyon a trusted partner for companies on the Forbes Global 2000 list.
With significant funding behind it, Halcyon will ramp up the development of its platform's features and continue expanding its customer base.
Kirsty
Company Specialist at Welcome to the Jungle
Company
Funding (last 2 of 4 rounds)
Nov 2024
$100m
SERIES C
Dec 2023
$40m
SERIES B
Total funding: $204m
Company benefits
- A Remote Native Global Team - As a remote first, completely distributed team, we recognize great talent can exist anywhere. We invite you to apply to a job you’re interested in and we'll work a plan to meet your needs.
- Health & Wellness - We offer comprehensive health benefits to meet you and your family’s needs, including 100% covered Medical, Dental and Vision insurance for you and all your dependents.
- Competitive Compensation Packages - We offer competitive compensation packages with equity, depending on position, along with a generously matched retirement plan, unlimited PTO, paid sick time and holidays
- Future Planning & Time Off - We offer paid time off to take care of yourself! Relax and recharge on us. We also include paid parental leave, short & long term disability insurance, life insurance and more
Company HQ
Congress Avenue Historic District, Austin, TX
Leadership
Jon Miller
(CEO & Co-Founder)Previously CEO and Founder at Boldend, Advisory Board member at Cylance, Vice President at Accuvant LABS, Managing Consultant at IBM.
Ryan Smith
(CTO & Co-Founder)Currently Owner at Hustle Labs. Previously Chief Research Officer at Boldend, Advisory Board Member at Cylance.
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