Senior Software Engineer, Core Infrastructure

** Job Description*
* 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.

** Responsibilities*
* + 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.

** Required Qualifications*
* + 5-8+ years of experience building, managing, or operating large-scale distributed infrastructure in SaaS, cloud, or hybrid-cloud environments.

+ 3+ 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.

** Desired Skills*
* + 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.

** What Success Looks Like*
* + 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.

Discla…