Agent Engineer- Rust Developer (mid to senior)

The Role

Halcyon’s goal is to deliver an anti-ransomware solution that breaks new ground as to what a security product can deliver. As part of this effort, we are hiring Agent Engineer- Rust Focused to help build and evolve the systems that power our endpoint agents. Our agent is the main endpoint communications hub and analysis engine that is used to help ensure our customers are protected from the threat of ransomware. If you’re passionate about security and want to make a real difference, we’d love to hear from you.

Responsibilities

• Core Agent Platform Development: Design, build, and maintain scalable, cross-platform systems and services—primarily in Rust—that support endpoint tooling, secure bi-directional agent–cloud communication, and enterprise alerting capabilities. Contribute to components across their lifecycle, with a focus on implementation, reliability, and performance in real-world customer environments. Collaborate closely with backend and product teams to ensure seamless integration with Halcyon’s core services, while emphasizing security, efficiency, and operational quality.
• Cross-Platform Code Contribution: Work with multi-platform logic in Rust while ensuring compatibility and optimal performance across different operating systems and architectures.
• Debugging & Optimization: Use logs, debuggers, and profiling tools to analyze performance, diagnose issues, and ensure correct behavior across all supported platforms.
• Test & Maintain Code Quality: Write unit and integration tests for your code, adhering to consistent coding style guidelines and overall product architecture.
• Team Collaboration: Communicate effectively with other developers and teams to ensure the component integrates well within the overall product architecture and maintains interoperability across platforms.

Skills and Qualifications

• Experience 5+ years of total experience
• Ability to develop high-quality, production-ready code in Rust.
• Ability to work independently and take ownership of tasks from design through delivery.
• Knowledge and experience with the following Rust crates: threading, async, tokio.
• Experience or familiar with one of the following- Windows, Linux and/or macOS APIs
• Strong verbal and written communication skills.

Bonus Skills and Qualifications

• Experience developing production systems in Python.
• Experience with system-level programming and OS internals
• Familiarity with SQL
• Knowledge of additional languages (C++)
• Knowledge of endpoint security concepts and threat detection

Benefits:

Halcyon offers the following benefits to eligible employees:

• Comprehensive healthcare (medical, dental, and vision) with premiums paid in full for employees and dependents.
• 401k plan with 3% employer match
• Short and long-term disability coverage, basic life and AD&D insurance plans.
• Medical and dependent care FSA options.
• Flexible PTO policy
• Parental leave
• Generous equity offering

The Company reserves the right to modify or change these benefits programs at any time, with or without notice.

#LN-DNI

Base Salary Range: $160-220k, 10% bonus, and equity.