Senior iOS Developer building SwiftUI features for Lightspeed’s hospitality commerce platform. Improving POS workflows, integrations, reliability, and expansion into global markets.
About the role
- Endpoint Engineer building macOS EDR sensors for Ent’s workspace security platform. Designing privileged agents, telemetry pipelines, and prevention controls across customer fleets.
Responsibilities
- Design, build, and ship the privileged daemon, per-user agents, and system extensions comprising the macOS agent
- Observe process, file, network, device, and user-interaction activity and convert it into intent signals
- Own EDR-class detection and prevention end to end, including instrumentation, event enrichment, correlation, rule evaluation, and interception logic
- Instrument telemetry using the Endpoint Security framework, Network Extensions, FSEvents, IOKit, and event taps
- Design and maintain the launchd-managed, multi-process architecture and XPC protocols
- Implement code-signing-based peer authentication and safely handle untrusted input in privileged processes
- Harden the agent against tampering, bypass, and evasion
- Keep CPU, memory, and I/O within strict budgets while processing thousands of events per second
- Build test harnesses and automated regression coverage, including VM-based end-to-end testing
- Resolve high-severity customer escalations involving crashes, hangs, performance regressions, missed detections, permission failures, and deployment failures
- Partner with security research, AI, platform, and product teams on ML classification, policy enforcement, interventions, and investigation timelines
- Review code, mentor engineers, document design decisions, and share ownership of release quality and on-call
Requirements
- 10+ years designing, building, and delivering production native systems software
- Strong, current Swift skills, including modern concurrency (actors, Sendable, structured concurrency)
- Substantial experience in endpoint security, OS internals, or comparable performance-critical code
- Deep knowledge of macOS internals, including process and thread lifecycle, memory management, file systems, code signing and entitlements, launchd, XPC and Mach IPC, and the TCC permission model
- Production experience with the Endpoint Security framework and/or Network Extensions
- Understanding of the system extension lifecycle that replaced kernel extensions
- Experience building or operating an EDR, EPP, XDR, DLP, or insider-risk product, or equivalent detection-and-response engineering
- Practical fluency in attacker TTPs
- Low-level debugging skills with lldb, crash-dump and hang analysis, and Instruments or equivalent
- Experience with multithreaded and concurrent programming under load
- Track record of deploying code on large fleets without degrading end-user experience
- Understanding of enterprise deployment realities, including MDM profiles, notarization, staged rollout, and auto-update
- Scripting fluency in Python, shell, or equivalent
- Clear written and verbal communication with distributed teams and customers when needed
- Reverse engineering, malware analysis, or exploit and vulnerability research background (bonus)
- Experience shipping on-device ML inference (Core ML, ONNX Runtime, or llama.cpp-class runtimes) in a resource-constrained agent (bonus)
- Experience with browser extension or native-messaging integrations for telemetry capture (bonus)
- Cross-platform endpoint agent experience with Windows or Linux sensors alongside macOS (bonus)
Benefits
- Meaningful equity on top of salary
- 90% of medical, dental, and vision coverage paid by Ent
- 75% coverage for dependents
- Flexible PTO
- 12 weeks of fully paid maternity leave (birth, adoption, or foster)
- 8 weeks of fully paid paternity leave
- $100 monthly lifestyle account for fitness, wellness, learning, and more
- $500 home office stipend for remote employees
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Degree requirement
No Education Requirement
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