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DNSFilter · 17 hours ago

Senior macOS Developer

United States

Full-time

Remote

Senior Level

$140K/yr - $160K/yr

5+ years exp

DNSFilter is a rapidly growing company dedicated to creating a safer internet for businesses and organizations worldwide. They are seeking a Senior Software Engineer specializing in macOS development to design, build, and maintain a macOS and iOS system extension that intercepts and routes DNS traffic for intelligent filtering and protection.

Cyber SecurityMachine LearningNetwork Security

Comp. & Benefits

Responsibilities

Be a key member of our Product Engineering organization, developing our next-generation macOS client application and System Extension that securely intercepts and routes DNS/network traffic

Design, build, and maintain a NetworkExtension-based application using Apple's NEDNSProxyProvider and/or NEFilter frameworks to filter and control DNS queries

Collaborate closely with QA and product teams to define requirements and acceptance criteria for new features

Deliver real business value to our customer base

Expand your knowledge on all technologies within our ecosystem

Qualification

MacOS developmentSystem ExtensionsNetworkExtension frameworksDNS fundamentalsSwiftObjective-CMacOS development toolsGitCommunication skillsTeam collaboration

Required

5+ years of experience developing and maintaining macOS applications

Strong experience with System Extensions (SEXT) and NetworkExtension frameworks (NEDNSProxyProvider, NEFilterControlProvider, etc.)

Deep understanding of DNS fundamentals, including TCP/IP, DoH, and DoT protocols

Proficiency in Swift and Objective-C, with additional experience in Go, C, or C++ preferred

Familiarity with macOS development tools (Xcode, Instruments, lldb, tcpdump, Wireshark)

Experience with code signing, entitlements, provisioning profiles, and notarization

Knowledge of MDM platforms (Jamf, Mosyle) and deployment best practices in enterprise environments

Experience with Git, modern CI/CD pipelines, and automated testing frameworks

Strong communication skills and comfort working in distributed, asynchronous teams

Availability to work hours overlapping 9am–5pm EST, Monday–Friday

Preferred

Deep knowledge of macOS internals and system-level debugging

Experience implementing DNS filtering, proxying, or network interception technologies

Familiarity with continuous integration systems (GitHub Actions, Jenkins, etc.)

Experience with scripting languages (Python, Shell, or Go) for build and deployment automation

Exposure to TLS, mutual authentication, or certificate pinning

Understanding of endpoint protection, security auditing, or privacy compliance standards

Close proximity to our Tampa, FL office

Benefits

Pathway to promotion to additional organizational positions and responsibilities based upon results and performance, not just time in the chair. You help us grow, and we will help you grow.

Passionate and intelligent colleagues who work hard and have a good time doing it

Paid company-wide week off at the end of each year

Flexible Vacation Policy

Awesome company swag

Full medical, dental, and vision benefits for US, UK, and Canada-based employees

Full short-term disability and life benefits; available long-term disability

Retirement savings account options with vested company matching for qualifying employees

In-person annual gatherings. Last time we all spent a week on a beach in Cancun!