Senior QA Engineer

Who we are DigiCert is a global leader in intelligent trust. We protect the digital world by ensuring the security, privacy, and authenticity of every interaction. Our AI-powered DigiCert ONE platform unifies PKI, DNS, and certificate lifecycle management, to secure infrastructure, software, devices, messages, AI content and agents. Learn why more than 100,000 organizations, including 90% of the Fortune 500, choose DigiCert to stop today’s threats and prepare for a quantum-safe future at www.digicert.com Job summary DigiCert DNS is revitalizing its engineering culture and adopting modern software design and delivery techniques.  We are looking for intellectually passionate people who learn quickly, thrive in a fast-paced environment and stay current with the latest technologies.  We want people who fit our emerging Agile/Devops culture, enjoy debating and learning from differing opinions, and have a high level of engagement. Strong programming and software design skills are essential, so we'll ask you to write code during most steps of the interview process. What you will do Define and lead test strategy and quality approach for DNS and distributed platform services. Design and execute high-scale load and performance tests simulating real-world DNS traffic patterns. Validate: DNS resolution accuracy, Propagation consistency, Failover mechanisms (GTD, traffic routing), and Latency and availability SLAs. Build and maintain automation frameworks for API, system, and performance testing. Perform end-to-end validation across distributed services and microservices architectures. Troubleshoot complex issues across: Application layer, Network/DNS layer, and Infrastructure layer. Work closely with developers to identify root causes and ensure defect resolution. Ensure systems meet functional and non-functional requirements (scalability, reliability, performance). Mentor QA and engineering team members on best practices in testing distributed systems. Collaborate with stakeholders to define quality metrics, acceptance criteria, and release readiness. Drive improvements in test coverage, automation, and release quality. What you will have Bachelor’s degree in Computer Science, Engineering, or related field, or equivalent experience. 7+ years of experience in software quality engineering or testing enterprise systems. 2+ years of experience working with distributed systems or high-scale platforms. Strong experience in DNS concepts and systems, including: DNS resolution, caching, TTL, Authoritative vs recursive DNS, and Load balancing, GeoDNS, traffic routing. 2+ years of experience working in Unix/Linux environments. Strong experience with test automation (Java/Python preferred). Experience testing RESTful APIs and microservices architectures. Hands-on experience with performance and load testing tools (e.g., JMeter, Gatling, k6). Experience with cloud platforms (AWS preferred) and distributed architectures. Familiarity with CI/CD pipelines and automation frameworks. Experience working with relational and NoSQL databases. Strong debugging and problem-solving skills across multiple system layers. Ability to communicate clearly and influence technical decisions. Nice to have Experience testing DNS platforms or networking systems. Familiarity with tools like: dig, nslookup, tcpdump, Wireshark. Experience with containerized environments (Docker, Kubernetes). Exposure to observability tools (Splunk, Prometheus, Grafana, CloudWatch). Experience with chaos testing tools (Gremlin, Chaos Monkey). Benefits Generous time off policies Top shelf benefits Education, wellness and lifestyle support #LI-SD1