Senior Core Infrastructure Engineer

Designs, implements, and optimizes components in distributed systems with an emphasis on scalability, resiliency, and operability. Delivers features and load/performance tests; leverages data plane platforms and distributed state tools for high-volume retrieval, storage, and processing; and reviews peers’ implementations for scalability compliance. Builds fault-tolerant paths (redundancy, replication, automatic failover), applies recovery‑oriented principles, and implements retries, circuit breakers, and timeouts. Proactively detects and mitigates issues via tests, alarms, dashboards, and telemetry; authors runbooks and participates in incident response and RCAs. Implements standard replication and synchronization, develops automation/IaC for troubleshooting and maintenance, and applies advanced security controls (encryption, access, remediation) while ensuring change, compliance, and documentation standards are met.

Responsibilities

We are seeking a Senior Core Infrastructure Engineer to join our DNS Data Plane team. You will design, build, and operate high-performance, highly reliable DNS services that power critical infrastructure at a global scale. This role focuses on performance-sensitive systems, distributed networking, and operational excellence, balancing correctness, latency, and resiliency.

• Design and implement DNS data plane components across authoritative and recursive request paths, emphasizing low-latency, high-throughput processing.
• Build services and libraries in Go, C, Java, or Python, selecting the appropriate language and approach for each component’s performance and operational requirements.
• Optimize CPU, memory, and network I/O through efficient event loops, concurrency models, socket tuning, profiling, and benchmarking.
• Own data plane components end to end, including architecture, implementation, testing, safe rollout, observability, capacity planning, and ongoing operational health.
• Develop and maintain metrics, logs, traces, SLOs, dashboards, alerts, and practical on-call playbooks.
• Improve reliability through fault-tolerant design, graceful degradation, safe deployment practices, and proactive capacity planning.
• Collaborate with control plane, security, SRE, and operations teams to deliver end-to-end DNS platform improvements.
• Provide technical leadership through architecture reviews, code reviews, and mentorship, raising engineering standards across the team.
• Take ownership of production outcomes by proactively identifying and driving performance, reliability, security, and operational improvements.

• At least five years of experience building, managing, or operating large-scale distributed infrastructure in SaaS, cloud, or hybrid-cloud environments.
• At least three years of hands-on experience with Linux operating systems.
• Strong experience building and operating production-grade distributed systems or network services.
• Proficiency in one or more of Go, C, Java, or Python, with the ability and interest to work across languages when needed.
• Solid understanding of Linux systems, networking fundamentals, TCP/UDP, sockets, concurrency, and performance profiling.
• Demonstrated experience designing highly available systems and delivering safe production rollouts using practices such as canaries, progressive deployments, and feature flags.
• Strong ownership and sound technical judgment, with the ability to navigate ambiguity and drive complex problems to durable resolution.

• Deep DNS knowledge, including relevant RFCs, DNS over UDP and TCP, EDNS(0), DNSSEC, caching behavior, zone transfers, rate limiting, and load balancing.
• Experience with high-performance systems patterns such as epoll/kqueue, asynchronous I/O, low-lock or lock-free data structures, and packet processing.
• Familiarity with DDoS mitigation, abuse prevention, and traffic engineering for L4 and L7 services.
• Experience with containers and orchestration platforms such as Kubernetes, including service meshes and network policies where relevant.
• Infrastructure-as-code experience, particularly with Terraform.
• Strong testing discipline, including unit, integration, fuzz, property-based, performance, and chaos testing.
• Experience operating mission-critical, 24/7 services.
• Experience using AI-assisted development tools to accelerate coding, testing, debugging, and documentation while maintaining strong engineering judgment, ownership, code quality, and security standards.

• You deliver measurable improvements in latency, throughput, reliability, and operational efficiency.
• You take end-to-end ownership of the systems you build, from initial design through long-term production health.
• You evolve the DNS platform through clean architecture, strong operational readiness, and secure-by-design practices.
• You identify risks and opportunities early and drive pragmatic improvements beyond the immediate task.
• You raise team standards through mentorship, thoughtful technical leadership, and a culture of operational excellence.

Qualifications

Career Level - IC3

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