macOS Endpoint Security Engineer

This

position

is

listed

on

behalf

of

a

partner

company,

who

manages

all

applications

and

next

steps.

Our

partner

is

looking

for

a

macOS

Endpoint

Security

Engineer

based

in

the

United

States
.

We

are

looking

for

an

experienced

macOS

Endpoint

Security

Engineer

to

contribute

to

the

development

of

advanced

endpoint

protection

technology.

In

this

role,

you

will

work

on

a

sophisticated

security

sensor

designed

to

monitor

file,

process,

network,

and

identity

activity,

prevent

malicious

behavior,

and

deliver

security

telemetry

to

cloud-based

systems.

You

will

focus

on

low-level

macOS

systems

programming,

building

reliable

and

high-performance

software

using

modern

C++

and

Swift.

Working

within

a

cross-platform

engineering

environment,

you

will

help

maintain

shared

codebases

supporting

macOS,

Windows,

and

Linux.

The

position

requires

strong

expertise

in

concurrency,

memory

management,

debugging,

and

performance

optimization.

This

is

an

opportunity

to

tackle

complex

cybersecurity

challenges

while

strengthening

the

security

and

reliability

of

enterprise

devices.

Accountabilities:

Develop,

enhance,

and

maintain

macOS

endpoint

security

components

using

modern

C++

(C++17/C++20),

Swift

6,

and

Objective-C++.

Contribute

to

the

development

of

an

endpoint

security

sensor

that

monitors

file,

process,

network,

and

identity

activities,

blocks

malicious

behavior,

and

transmits

security

telemetry.

Implement

and

maintain

macOS

System

Extensions

and

Endpoint

Security

clients,

including

authorization

(AUTH)

events,

notification

events,

user

and

MDM

approval

workflows,

and

extension

upgrades.

Develop

and

optimize

system-level

components

using

Foundation,

CoreFoundation,

Grand

Central

Dispatch

(GCD),

pthreads,

POSIX/BSD

APIs,

Mach

IPC,

launchd,

and

XPC.

Build

and

maintain

network

security

capabilities

using

Network

Extensions,

including

flow-level

and

packet-level

content

filtering,

and

Network.framework.

Implement

security

mechanisms

involving

code-signature

verification,

certificate

validation,

Keychain,

entitlements,

hardened

runtime,

and

macOS

privacy

permissions.

Support

hardware

and

storage-related

functionality

through

IOKit

and

DiskArbitration.

Optimize

application

performance,

concurrency,

CPU

utilization,

and

memory

consumption

to

ensure

high

reliability

and

minimal

system

overhead.

Investigate

and

resolve

complex

technical

issues

using

Instruments,

os_signpost,

LLDB,

crash

logs,

and

os_log.

Develop

and

maintain

automated

tests

using

XCTest,

sanitizers,

fuzz

testing,

and

xcodebuild-based

continuous

integration

pipelines.

Ensure

software

compatibility

across

Apple

Silicon

and

Intel-based

Mac

systems.

Collaborate

with

cross-platform

engineering

teams

to

maintain

shared

codebases

supporting

macOS,

Windows,

and

Linux.

Contribute

to

application

packaging,

installation,

notarization,

and

deployment

through

MDM

solutions

such

as

Jamf

and

Microsoft

Intune.

Support

software

quality,

secure

development

practices,

and

production

reliability

throughout

the

development

lifecycle.

Requirements:

6–10

years

of

professional

software

engineering

experience,

with

consideration

for

more

senior

candidates.

Strong

proficiency

in

modern

C++,

particularly

C++17/C++20,

and

Swift

6,

including

async/await,

actors,

and

strict

concurrency

checking.

Hands-on

experience

with

Objective-C++

and

integrating

Swift,

C++,

and

C

APIs.

Strong

macOS

systems

programming

knowledge,

including

Foundation,

CoreFoundation,

GCD,

pthreads,

POSIX/BSD

APIs,

and

Mach

IPC.

Experience

with

launchd

daemons

and

agents,

XPC

C

APIs,

and

NSXPCConnection.

Practical

experience

in

at

least

one

or

more

of

the

following

areas:

Endpoint

Security

and

System

Extensions:

Endpoint

Security

clients,

authorization

and

notification

events,

extension

approvals,

MDM

integration,

and

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