Network Engineer

This role can be based in either Singapore or in the United States. 

Ahrefs is seeking an experienced Network Engineer to join our team and help manage our large-scale distributed infrastructure. In this role, you will be responsible for the design, implementation, and maintenance of our network infrastructure, ensuring high availability, performance, observability, and security.

Our system is a big part of custom OCaml code and also employs third-party technologies - Debian, ELK, Puppet, Ansible and anything else that will solve the task at hand. In this role, be prepared to deal with 100+ petabytes storage cluster, 3,000+ bare-metal servers, experimental large-scale deployments and all kinds of software bugs and hardware deviations on a daily basis.

Responsibilities

• Design, implement, document, and maintain a robust and scalable network infrastructure to support Ahrefs' distributed crawler and web services
• Configure and manage network devices such as routers, switches, load balancers, as well as Linux servers
• Improve and monitor network observability and performance, troubleshoot issues related to network connectivity, latency, and throughput for network devices and servers
• Implement network security measures, including firewalls, VPNs, and access control lists
• Collaborate closely with the infrastructure team to ensure seamless integration between network and server infrastructure
• Participate in the on-call rotation to provide 24/7 support and incident response
• Automate network management tasks and develop scripts to improve efficiency

Requirements

• Deep understanding of network protocols on different levels (TCP/IP , BGP , OSPF , etc.) and network architectures
• Extensive experience with network devices and network operating systems from major vendors (e.g., Cisco, Juniper, NVIDIA)
• Strong knowledge of network security principles and best practices
• Proficiency in network automation tools (e.g., Ansible, Puppet, Python, Bash scripting)
• Experience with virtualization technologies (e.g., VLANs, VXLANs, GRE tunnels)
• Familiarity with cloud networking concepts and services (e.g., AWS VPC, Azure Virtual Network)
• Strong troubleshooting and problem-solving skills
• Excellent communication and documentation skills
• Bachelor's degree in Computer Science, Information Technology, or a related field

Preferred Qualifications

• Experience working with bare-metal servers and large-scale distributed systems
• Knowledge of Linux operating system internals and kernel-level networking
• Familiarity with monitoring and logging tools (e.g., ELK stack, Prometheus, Grafana)
• Experience with OCaml or other functional programming languages is a bonus

Who We Are

Ahrefs runs an internet-scale bot that crawls the whole web 24/7, storing huge volumes of information to be indexed and structured in a timely fashion. Our backend system is powered by a custom petabyte-scale distributed key-value storage to accommodate all that data coming in at high speed. With this data, Ahrefs builds analytics services for end-users in the Search Engine Optimization (SEO) space and a web-scale search platform.

We are a lean and robust team who strongly believe that better technology leads to better solutions for real-world problems.

Our motto is "first do it, then do it right, then do it better".