Senior Software Engineer - Windows RC

Senior Software Engineer (Windows)

Company: DNSFilter
Location Preference: Tampa, Florida (Hybrid possible)
Role Type: Full-time

About DNSFilter:
DNSFilter is revolutionizing network security with fast, accurate, and reliable threat protection and content filtering. Our AI-driven threat intelligence empowers businesses worldwide to block threats proactively. We foster a collaborative, innovative, and results-oriented culture dedicated to creating a safer internet.

The Role:
We are seeking a Senior Software Engineer specializing in Windows development to join our product engineering team. You will be instrumental in building and maintaining our roaming client software, which runs on over a million machines, securing customer networks by filtering DNS traffic and blocking incoming risks. This is a critical role in our hyper-growth SaaS startup.

In this role, you will:

• Be a key member of the Product Engineering team, working on our Windows Roaming Client application responsible for device/user identity management, DNS resolver modification, DNS request interception, and managing sub-services like VPN and User Behavior Analytics (CyberSight).
• Build, modify, and support applications using .NET Framework/Core C# and PowerShell.
• Utilize Windows Native APIs via P/Invoke calls for system actions and information gathering.
• Collaborate with cross-functional teams to define, design, and ship new features.
• Contribute to the continuous improvement of development and deployment processes.
• Demonstrate strong ownership from project inception to delivery.
• Leverage AI to accelerate learning and productivity, and advocate for its use within the department.

To qualify for this role, you have:

• 5+ years of experience as a Software Engineer developing and maintaining Windows applications.
• Proficiency in C#, .NET, and PowerShell.
• Knowledge of Windows application development, debugging, and multithreading.
• Understanding of networking fundamentals (TCP/IP, DNS, HTTP/S) and interaction with the Windows network stack.
• Proficiency with traffic capture tools (Wireshark), log gathering, and data preparation for reporting.
• Understanding of different Windows OS versions.
• Experience developing and maintaining scripts (PowerShell, Shell, etc.).
• Proven ability to leverage AI tools (e.g., GitHub Copilot, Claude, LLMs) to accelerate coding, debugging, and unit test generation while maintaining high security and performance standards.
• Experience integrating AI into the SDLC (documentation, PR summaries, architectural prototyping).
• Knowledge and experience in all aspects of the SDLC.
• Experience working remotely with minimal supervision.
• Passion for producing quality products, strong work ethic, and excellent organizational skills.
• Strong commitment to collaborative work in a remote environment.
• Ability to overlap work hours with the 8:00 AM - 5:00 PM EST timezone, Monday-Friday.

Bonus points for:

• Ability to work hybrid from the Tampa office.
• Knowledge or experience with Ruby, Go, Next.js, and TypeScript.
• Knowledge of feature flag management tools (e.g., LaunchDarkly).
• Experience working with multiple distributed/global teams.
• Experience building a security product.
• Excellent documentation skills.
• Awareness of AppSec, OSS licensing, and security tools.

We Offer:

• Clear pathways for promotion based on performance.
• Passionate and intelligent colleagues.
• Paid company-wide week off at the end of each year.
• Flexible Vacation Policy.
• Awesome company swag.
• Full medical, dental, and vision benefits (US, UK, Canada).
• Short-term disability, life benefits, and available long-term disability.
• Retirement savings account options with company matching.
• In-person annual gatherings (previous: Dominican Republic trip).

Compensation:

• U.S. hiring salary range: $125,000—$135,000 USD.
• Pay-for-performance model with opportunities for compensation advancement.
• Hiring base pay depends on factors like level, function, experience, business needs, and geographic location.

DNSFilter participates in the E-Verify program.
DNSFilter utilizes software to identify and eliminate Deepfake candidates to ensure hiring integrity.