Senior Network Engineer

AHREFS PTE. LTD.; Singapore; On-site; SGD 70,000 - 120,000; Full time

Job summary

A leading company in digital marketing technology is seeking an experienced Network Engineer to enhance the performance and security of their network infrastructure. The successful candidate will manage a large-scale distributed environment, ensuring high availability and robust design. With responsibilities spanning network design, implementation, and troubleshooting, this role is vital for supporting business operations 24/7. candidates with a Bachelor's degree in Computer Science and robust network expertise will excel in this dynamic role.

Qualifications

• Deep understanding of network protocols (TCP/IP, BGP, OSPF).
• Experience with network devices (Cisco, Juniper).
• Proficient in network automation (Ansible, Python, Bash).

Responsibilities

• Design and maintain scalable network infrastructure.
• Manage network devices and troubleshoot connectivity issues.
• Implement network security measures and automate tasks.

Skills

Network Protocols

Network Security

Troubleshooting

Network Automation

Communication Skills

Education

Bachelor's degree in Computer Science

Tools

Ansible

Puppet

OCaml

ELK stack

Prometheus

Grafana

Job description

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