Senior C#/.NET Full Stack Engineer

About Us

DNSai LLC is an independent technology company focused exclusively on building practical, high-performance tools for understanding and working with the Domain Name System (DNS). We are not an email security company. DNSai is a Cyber Security DNS Utility, a purpose-built set of utilities that make DNS data easier to access, interpret, and apply to real-world workflows across IT, security operations, research, and digital operations.

We are looking for a highly skilled and motivated Senior C#/.NET Full Stack Engineer with extensive experience across the C#/.NET ecosystem, AWS, Azure, Docker, and Kubernetes to join our growing team. You will play a key role in developing and maintaining both frontend and backend systems behind our DNS utilities — services that must stay fast, accurate, and reliable while processing large volumes of DNS data.

Responsibilities

• Design, develop, and maintain scalable and secure applications and DNS utilities using C# and .NET technologies.
• Build and maintain cloud-based infrastructure on AWS and Azure for high-throughput, low-latency DNS data processing.
• Develop and implement RESTful APIs that expose DNS lookup, enrichment, and analysis capabilities to internal and external consumers.
• Collaborate with product, research, and design teams to turn complex DNS data into clear, usable tooling.
• Utilize Docker and Kubernetes to containerize applications and ensure smooth deployment pipelines.
• Troubleshoot, debug, and optimize applications for performance and reliability at scale.
• Write efficient, maintainable, and testable code following best practices.
• Participate in code reviews and ensure adherence to coding standards.
• Implement CI/CD pipelines to streamline deployments using AWS and Azure services.
• Ensure security and data protection across applications and services, in line with the expectations of a cyber security utility.
• Stay up-to-date with DNS standards, security trends, and platform technologies to enhance development practices.
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Requirements

• Proven experience as a Full Stack Developer, with a focus on C# and .NET technologies.
• Solid understanding and hands-on experience with AWS and Azure cloud services.
• Expertise in containerization technologies such as Docker and Kubernetes.
• Strong experience with SQL and NoSQL databases (e.g., SQL Server, MongoDB).
• Familiarity with frontend technologies (e.g., JavaScript, React.js, Angular) is a plus.
• Experience in building and consuming RESTful APIs.
• Knowledge of version control systems like Git.
• Strong problem-solving skills and the ability to debug complex issues.
• Familiarity with agile methodologies and CI/CD processes.
• Excellent communication and collaboration skills to work with cross-functional teams.

Preferred Qualifications

• Working knowledge of DNS concepts and protocols (record types, resolvers, zone data, DNSSEC, passive DNS), or a strong interest in learning them quickly.
• Experience with microservices architecture and serverless computing.
• Familiarity with DevOps practices and infrastructure-as-code tools (e.g., Terraform).
• Understanding of security best practices and cloud-native security services.
• Experience with high-volume data pipelines or network/telemetry data.
• Experience with testing frameworks (unit, integration, and UI testing).

Why DNSai?

• Competitive salary and flexible payment method.
• Deep, focused work in a single problem domain — DNS — rather than scattered consulting projects.
• Opportunities for growth and professional development.
• Flexible working hours and full remote work opportunity.
• Work in a collaborative, innovative and inclusive environment.