Senior Software Engineer, Cloud Network

Role Description

This is a full-time Senior engineering position based in Virginia, US.

What you will be doing:

• Design, build, and operate the systems that power Slack’s global cloud networking stack—including ingress/egress load balancing, service-to-service networking, DNS, CDN, and traffic management.
• Develop and automate detection, mitigation, and response systems to defend against DDoS and other large-scale network threats.
• Contribute to infrastructure-as-code and automation frameworks to improve reliability, repeatability, and efficiency.
• Troubleshoot complex issues across applications, distributed systems, and networks in Linux-based environments.
• Partner closely with AWS and other engineering teams to scale Slack’s worldwide infrastructure and adopt new cloud technologies.
• Drive improvements in system observability, reliability, and ease-of-use by iterating quickly on designs and collaborating across engineering.
• Participate in on-call rotations to ensure the availability and resiliency of critical Slack infrastructure.

Qualifications

• U.S. Citizenship or Permanent Residency (Green Card holder). We are unable to provide visa sponsorship for this role.
• 5+ years of experience in software engineering, with a strong focus on distributed systems, cloud-native applications, and microservices.
• Hands-on experience with cloud providers such as AWS or GCP.
• Strong knowledge of TCP/IP, DNS, DNSSEC, and related network protocols.
• Proven track record of building tools, automation, or services using one or more programming languages (e.g., Go, Ruby, Python, C/C++).
• Extensive experience with infrastructure-as-code (Terraform, CloudFormation).
• Prior experience deploying, operating, and debugging server software on Linux.
• Strong interpersonal and communication skills; able to explain complex technical concepts to designers, support staff, and fellow engineers.
• A BS, MS, or Ph.D. in Computer Science, Engineering, or related technical field (or equivalent work experience).

Requirements

• A domain expert within the AWS ecosystem (NLB, VPC / IAM / S3 / EC2).
• Experience contributing to or operating large-scale, highly available production systems.
• Knowledge of DDoS detection/mitigation strategies and automation frameworks.
• Interest in cost optimization and operational efficiency at cloud scale.

Benefits

• Time off programs
• Medical, dental, vision, mental health support
• Paid parental leave
• Life and disability insurance
• 401(k)
• Employee stock purchasing program