macOS Endpoint Engineer / Agent Developer

Location: Remote (Worldwide)

Employment Type: Full-Time (Contract)

Compensation: USD $6,000–15,000/month

FitNext Exclusive: No

Company Overview

Our client is an early-stage cybersecurity startup backed by Y Combinator, building next-generation AI-powered endpoint security technology.

The company is developing an intelligent Data Loss Prevention (DLP) and Insider Risk platform that detects suspicious data movement directly on employee devices through advanced endpoint telemetry and AI-driven threat detection. Built by engineers from companies such as AMD, JPMorgan, NASA, and Uber, the platform is already trusted by enterprise security leaders and is entering an exciting growth phase after launching its native endpoint architecture.

As one of the first engineers focused on the macOS platform, you'll own a critical part of the product and work directly with the founding team on architecture, technical strategy, and implementation.

Challenge

We are looking for a macOS Endpoint Engineer to design, build, and ship a production-grade macOS endpoint agent from the ground up.

This role requires deep expertise in macOS internals, Endpoint Security Framework, System Extensions, and system-level telemetry collection. You will own the architecture, implementation, deployment, and lifecycle of the agent while ensuring maximum system stability and performance.

You'll work closely with the founding team to define how telemetry is collected, processed, and streamed to an AI-powered security platform. This is a highly autonomous role where technical leadership is just as important as hands-on engineering.

Key Responsibilities

• Design, build, and maintain a production-grade macOS endpoint agent from architecture through deployment.
• Implement safe and reliable system-level telemetry collection using macOS APIs and operating system internals.
• Capture endpoint events including browser uploads, file movements, web searches, file renaming, and other indicators of suspicious activity.
• Stream telemetry efficiently to backend services while minimizing system overhead.
• Design deployment strategies including MDM policies, staged rollouts, secure update mechanisms, and rollback procedures.
• Ensure the endpoint agent operates safely without impacting customer system stability or performance.
• Reverse engineer and integrate macOS system APIs when necessary.
• Collaborate closely with the founding team on architecture decisions and technical strategy.
• Document architecture, deployment processes, and operational best practices.

Must Have

• 5+ years of professional software engineering experience.
• Proven experience designing, building, and shipping production macOS endpoint agents end-to-end.
• Deep knowledge of macOS internals, including Endpoint Security Framework, System Extensions, and system-level programming.
• Strong experience collecting endpoint telemetry safely without compromising operating system stability.
• Proficiency in Rust, or strong C++ experience with the ability and willingness to develop in Rust.
• Experience deploying endpoint agents at customer scale, including MDM policy management, staged rollouts, and update delivery.
• Strong understanding of software architecture for endpoint applications.
• Ability to work independently and lead technical decisions in a fast-paced startup environment.

Nice to Have

• Previous experience at endpoint security, DLP, EDR, or Insider Risk companies.
• Experience with companies such as Palo Alto Networks, CrowdStrike, SentinelOne, Cyberhaven, or Microsoft Defender.
• Experience developing endpoint agents for both macOS and Windows.
• Browser extension development experience.
• Cross-platform telemetry collection experience.
• Experience working in early-stage startups or founding engineering teams.
• Reverse engineering experience.
• Background in cybersecurity or endpoint protection technologies.

Soft Skills

• Strong ownership mentality with the ability to independently lead critical engineering initiatives.
• Excellent systems thinking and architectural decision-making skills.
• Highly autonomous and comfortable operating in fast-moving startup environments.
• Strong problem-solving abilities focused on reliability, performance, and stability.
• Ability to mentor and collaborate closely with technical founders.
• Excellent communication and documentation skills.
• Attention to detail when working with low-level systems where reliability is critical.
• Comfortable balancing speed of execution with production-quality engineering.

Benefits

• Fully remote position (Worldwide).
• Competitive compensation ranging from USD $6,000 to $15,000 per month, depending on location and experience.
• Opportunity to become one of the first engineering hires at a YC-backed Seed-stage cybersecurity startup.
• High ownership over a mission-critical product component.
• Direct collaboration with the founding team and significant influence over technical architecture.
• Work on cutting-edge endpoint security, systems programming, and AI-powered cybersecurity technology.
• Performance bonuses available during the initial ramp-up period.
• Long-term growth opportunities as the engineering team scales. 

Hiring Process

1. Application Review
2. Introductory Call
3. Take-Home Assignment
4. System Design Interview
5. Final Interview
6. Offer
7. Hiring