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Frontend Engineer

Remote

What we do:
Halcyon is the industry’s first dedicated, adaptive security platform that combines multiple proprietary advanced prevention engines along with AI models focused specifically on stopping ransomware.

Who we are:
Halcyon was formed in 2021 by a team of cyber industry veterans after battling the scourge of ransomware (and advanced threats) for years at some of the largest global security vendors. Comprised of leaders from Cylance (now Blackberry), Accuvant (now Optiv), Fireye and ISS X-Force (now IBM), Halcyon is focused on building products and solutions for mid-market and enterprise customers.

As a remote-native, completely distributed global 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.

 
The Role
 
At Halcyon, we're building a world-class anti-ransomware platform grounded in innovation and resilience. As part of that vision, we're looking for a mid-level Frontend Engineer to join our cloud team. You'll contribute to the development and evolution of our security platform's user interface, working within a modern React-based tech stack.
You'll join a team focused on building scalable, maintainable frontend systems that serve both internal and customer-facing functions. Your primary focus will be on React-based applications, with opportunities to shape our client-side rendered architecture. Prior experience with security products or data visualization would be a nice bonus.
 
Responsibilities
  • Contribute to feature development across our security platform's user interface, including dashboards, SOC analyst tools for alert triage, and
    asset management systems
  • Collaborate with product, design, and backend engineers to align on solutions and product requirements.
  • Develop, test, deploy, and monitor React-based frontend applications that are reliable, secure, and performant.
  • Support and enhance our client-side rendered React architecture, ensuring consistency and performance.
  • Maintain high standards for code quality, documentation, and operational reliability.
  • Participate in design discussions, code reviews, and incident response.
Skills and Qualifications
  • 3–6 years of frontend engineering experience, with recent experience in a React-based codebase.
  • Familiarity with modern React patterns (hooks, functional components) and TypeScript.
  • Strong understanding of modern web technologies, state management, and build tools (Vite, Webpack).
  • Experience building applications in a cloud-native environment, preferably with modern hosting platforms.
  • Working knowledge of modern CSS frameworks.
  • Comfortable working in a remote-first, asynchronous team environment.
Bonus Skills and Qualifications
  • Experience with Material-UI (MUI), Emotion, or similar component libraries.
  • Familiarity with TanStack Query (AKA react-query)
  • Experience with React Hook Form for form handling and validation.
  • Prior work in security products, data visualization, or high-availability systems.
  • Experience with Playwright for E2E testing.
  • Experience with AWS, Terraform, and GitHub Actions.
  • Knowledge of authentication systems and role-based access control.

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 a generous employer contribution.

  • 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.​

Base Salary Range: $120,000 - $170,000

In accordance with applicable state and federal laws, the range provided is Halcyon’s reasonable estimate of the base compensation for this role. The actual amount may differ based on non-discriminatory factors such as experience, knowledge, skills, abilities, and location. Base pay is one part of the total package that is provided to compensate and recognize employees for their work, and this role may be eligible for additional discretionary bonuses/incentives, and equity in the Company.

We understand it takes a diverse team of highly intelligent, passionate, curious, and creative people to develop the exceptional product we are building. Our dynamic team has incredible perspectives to share, just as we know you do, and we take great pride in being an equal opportunity employer.

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