At DNSFilter we have a singular mission: to challenge the way the industry thinks about security via DNS—and we need your help! We’ve come a long way over the past few years. In 2021 we had a successful $30 million Series A funding round, and in 2022 we became the fastest DNS security tool on the planet and joined forces with privacy-focused VPN Guardian! This year we’re continuing our product-fueled growth by adding new features to assist our customers with their DNS-layer security and broadening our solution to align with the Secure Web Gateway market.

As our company grows, we realize we have a missing piece and that’s where you come in! We are looking for a .NET Engineer to join Guardian to help us build a native Guardian Firewall app for Windows as well as help us grow our GuardianConnect SDK platform compatibility.

We recognize that people come with a wealth of experience and talent beyond just the technical requirements of a job. If you feel like this job is for you, please apply. We believe diversity of experience and skills, including transferable skills, combined with passion is a key to innovation and excellence; therefore we encourage people from all backgrounds to apply to our positions!

Job Description

  • Build and maintain Guardian Firewall and associated GuardianConnect Software Development Kit (SDK) for Windows
  • Work with stakeholders to identify features, highlight areas of concern, and build out technical solutions
  • Deliver new features, improvements, and real business value to our customer base
  • Tackle additional tasks outside of your core specialization in order to meet the team commitments
  • Works with our partners to integrate Guardian and DNSFilter solutions
  • Research, document, and propose improvements to DNSFilter applications and processes


  • Recent experience developing and maintaining Windows services/agents developed with .NET Framework
  • Recent experience writing high-level to middle-level software that interfaces tightly with the underlying Windows OS
  • Experience as a .NET Developer
  • Strong background in networking application development, multithreading, parallel programming, and using TPL (Task Programming Library)
  • Excellent OS-level knowledge of Windows and experience with scripting
  • Experience with application code-signing processes
  • A strong understanding of computer networking and DNS protocol
  • Knowledge of HTTP and REST APIs to connect to back-end services
  • Experience building and running CICD workflows in GitHub Actions
  • Proficient understanding of code versioning tools such as git or others
  • The ability to breakdown complex technical problems into manageable tasks
  • Attention to detail and pride in your work
  • A strong commitment to collaborative work in a remote environment

Bonus points for:

  • Experience with the WireGuard VPN transport protocol
  • Experience with Windows networking applications development
  • Familiarity with researching obscure Win32 APIs
  • Knowledge of Microsoft App Store related APIs (such as in-app purchases)
  • A strong understanding of data structure design and practical knowledge in querying languages such as SQL
  • An energetic & entrepreneurial team player who is a strong and proactive communicator
  • Self-starter who operates independently while being collaborative with the broader team
  • Remote working experience
  • Past experience working in a fast-paced private equity or venture capital-backed company


  • A 100% work-from-home position with a company that values and fosters personal and professional growth
  • Passionate and intelligent colleagues who work hard and have a good time doing it
  • Rotating 4-Day work week
  • Paid company-wide week off at the end of each year
  • Flexible Vacation policy
  • Awesome company swag
  • Home office buildout allowance
  • Full medical, dental, and vision benefits for US Based Employees
  • Full short-term disability and life benefits; available long-term disability
  • In-person Annual Gatherings. Last time we all spent a week on a beach in Cancun!

The hiring range for this role is: $140,500 to $165,000 USD AnnuallyDNSFilter is a pay for performance organization, which means there is the opportunity to advance your compensation with performance over time. The hiring base pay is dependent upon many factors such as level, function, training, transferable skills, work experience, business needs, and/or geographic location. As a fully remote company, our compensation reflects the cost of labor across several U.S. and global geographic markets. We pay differently based on those defined markets. Our Talent Team can share more about the specific salary range for the job location during the hiring process.