Principal Software Engineer

Company Overview

At F5, we strive to bring a better digital world to life. Our teams empower organizations across the globe to create, secure, and run applications that enhance how we experience our evolving digital world. We are passionate about cybersecurity, from protecting consumers from fraud to enabling companies to focus on innovation. Everything we do centers around people. That means we obsess over how to make the lives of our customers, and their customers, better.

And it means we prioritize a diverse F5 community where each individual can thrive.

F5, Inc. seeks Principal Software Engineer in Louisville, CO.

• Administer UNIX based systems, networking appliances, public/private clouds, and application delivery technologies.
• Engage with internal engineering teams to develop tooling and frameworks to drive full observability and automation of the environment.
• Enhance data‑driven engineering culture by providing statistical trends and analysis using real service data.
• Design and implement zero‑downtime deployment approaches, real‑time logging, alerting, and monitoring solutions, and code instrumentation, utilizing the features of NGINX Plus.
• Coordinate with solution architects to design secure, highly available solutions that meet objectives, automating solutions whenever possible.
• Develop solutions to identify reliability risks, monitor application growth, and triage production issues.
• Part‑time telecommuting is an option. Hybrid work from company office in Louisville, CO.

• Five (5) years of experience in a related field.

• Programming languages: C++, Python, Go. Shell scripting (including restricted I/embedded shells).
• Deep understanding of UNIX‑based systems with hands‑on experience administering large fleets of servers under FreeBSD, Linux, Solaris OS running on different architectures (Intel, ARM, SPARC, Power
  
  PC).
• SDLC methodology in software release engineering;
  Agile/Scrum approach; collaboration and cross‑functional teamwork (Jira, Git Lab Projects).
• NGINX Plus – extended proprietary software built on top of NGINX open‑source core, providing L4/L7 load balancing, caching, reverse proxy, dynamic reconfiguration, and live activity monitoring capabilities.
• Virtualization technologies and hypervisors (Xen, VMware, KVM, OpenVZ, LXC); security/isolation and resource management concepts of containers (name spaces, control groups); orchestration and management platforms (Kubernetes, Open Shift, EKS/AKS).
• Implementing ADC (Application Delivery Controller) solutions in highly distributed shared hosting environments backed by network appliances from Cisco/Crescendo + dynamic SDN (Software‑Defined Networking); leveraging dynamic routing protocols at scale (OSPF, BGP); managing L4/L7 load balancers (HAProxy, Nginx, Envoy, Traefik).
• Public and private clouds – AWS, Azure, GCP, OCI; focused on building multi‑cloud SaaS platforms and services.
• Dev Ops processes, tooling, and IaC – CI/CD workflows in Git Hub/Git Lab; administering self‑hosted runners;
  Git Ops (FluxCD);
  Terraform, Terragrunt;
  Ansible.
• Database engines – relational (Postgre
  
  SQL, MySQL); time‑series/No
  
  SQL (Prometheus/Mimir, Cassandra, Scylla
  
  DB);
  Click House.
• SRE / observability / monitoring / incident management – LGTM stack (Loki, Grafana, Tempo, Mimir);
  Grafana Cloud;
  Pager Duty;
  Sentry;
  Datadog; ELK stack (Elasticsearch, Logstash, Kibana).

$225,680 – $254,400 per annum.

F5 offers competitive pay, 401(k), and other benefits. F5 reserves the right to change or terminate any benefit plan without notice.

Hybrid:
Employees within 30 commutable miles of an F5 office are required to work from the office a minimum of 30 business days per quarter.
Remote:
Primarily work from a designated home location but can come into an F5 office to work or travel to an off‑site location as needed.

It is the policy of F5 to provide equal employment opportunities to all employees and employment applicants without regard to unlawful considerations of race, religion, color, national origin, sex, sexual orientation, gender identity or expression, age,…