F

F5

Multi-cloud app security and delivery platform

Principal Engineer

Full-Time
$225.6k - $338.4k/yr+ Incentive compensation + Bonus + Restricted stock units
Expert
Bachelor's, Master's
San Jose, CA, USA
Hybrid
Software EngineeringBackend Engineering
Company Historically Provides H1B Sponsorship

About the job

Requirements
  • A Bachelor's or Master's degree in Computer Science or Computer Engineering, or equivalent experience.
  • 12+ years of software engineering experience building high-performance networking, API gateway, application delivery, distributed control plane, or cloud security infrastructure software.
  • Strong hands-on programming skills in Go, C, or Rust.
  • Demonstrated experience with Kubernetes internals, container orchestration, and multi-cloud networking primitives, including AWS, Azure, GCP, and Private Cloud.
  • Solid understanding of the AI Software Development Lifecycle, modern AI application platforms, traffic optimization, and enterprise security protocols.
  • Proven ability to drive complex technical projects from concept to production deployment.
Responsibilities
  • Design, code, and deploy resilient, scalable features for enterprise AI control planes and data planes using Go, C, and Rust.
  • Implement advanced security controls, semantic policy enforcement, rate limiting, load distribution, and observability mechanisms tailored for high-throughput AI workloads and LLM pipelines.
  • Build Kubernetes-native operators, custom resource definitions, and high-performance proxy plugins bridging multi-cloud and on-premises environments.
  • Mentor senior and staff engineers, conduct architectural reviews, drive code quality standards, and enforce engineering best practices across teams.
  • Work closely with product management and platform architects to refine technical specifications and deliver robust platform releases.

About the company

F5 offers multi-cloud application services and security to keep apps secure and available across different hosting environments. Its products include web application and API protection (WAF and API security), bot defense, fraud prevention, and application delivery features like load balancing and access management. The solutions protect and accelerate applications wherever they run, combining security with delivery in a single toolkit, sold as licenses, subscriptions, and support contracts, plus professional services. The goal is to help customers securely deliver fast, reliable applications across any cloud or data center while reducing abuse and ensuring smooth user access.

Company Size

5,001-10,000

Company Stage

IPO

Headquarters

Seattle, WA

Founded

1996

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Simplify's Take

What believers are saying

  • Q3 FY2026 revenue reached $865 million, up 11%, with 19% product growth.
  • F5 raised FY2026 guidance to 9%–10% revenue growth after stronger demand.
  • MuleSoft integration and Dreamforce 2026 visibility should accelerate AI-security sales cycles.

What critics are saying

  • CVE-2026-94127 was actively exploited on September 22, 2026, undermining trust.
  • February 2026 securities litigation alleges F5 concealed the 2025 BIG-IP breach.
  • Cloudflare, NetScaler, and Radware pressure F5 on cost, simplicity, and modernization.

What makes F5 unique

  • iRules keeps BIG-IP programmable without changing applications, a sticky enterprise control point.
  • F5 AI Security Platform spans models, agents, APIs, and hybrid multicloud environments.
  • Workforce AI Security extends network-path governance to employee AI use and agent actions.

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Benefits

  • Comprehensive medical, dental, & vision coverage
  • Paid employee life & disability insurance
  • Employee Assistance Program (EAP)
  • Competitive pay
  • Employee Stock Purchase Plan
  • 401(k) with company match
  • Health and daycare saving accounts (HSA and FSAs)
  • Tuition assistance
  • Adoption assistance
  • 20 days of vacation and 25 days of vacation after year 5
  • 10 days of sick leave
  • 8 Weeks Paid FMLA & Family Leave

Growth & Insights and Company News

6 month growth

0%

1 year growth

0%

2 year growth

0%
Yahoo Finance
Oct 31st, 2026
F5 beats Q3 estimates with $917.4M revenue, but shares fall on margin pressure

F5 beat Wall Street expectations in its latest quarter, with revenue up 13.3% year on year to $917.4 million. Adjusted earnings were $4.42 per share, 3.9% above analyst estimates. Chief executive officer Francois Locoh-Donou credited demand for AI-powered security and hybrid multi-cloud products. More than 300 customers deployed its AI-driven web application firewall within six months, and direct AI bookings topped $100 million. Operating margin fell to 23.1% from 25.4% a year earlier, as spending on sales, marketing and inventory rose. Management expects costs to stay high in the near term. F5 guided fourth-quarter revenue of $885 million at the midpoint. Shares trade at $363.89, down from $459.36 before the results.

Yahoo Finance
Oct 28th, 2026
F5 stock may be 14% overvalued at $459.36 despite Telenor AI deal

F5 shares may be about 14% overvalued, according to a discounted cash flow (DCF) analysis by Simply Wall St. The stock trades at $459.36, a little above the model's estimate of intrinsic worth. The model starts from F5's free cash flow of about $994 million over the last twelve months. It assumes growth that follows analyst forecasts in the near term and slows later. F5 has returned 203.0% over three years and trades at 35.8 times earnings. It recently teamed up with Telenor on an AI service plane running on NVIDIA-powered sovereign infrastructure. Community views differ. The bull case sees the stock 11% undervalued, while the bear case sees it 5% overvalued, citing annual recurring revenue growth of just 3.3%.

F5, Inc.
Oct 22nd, 2026
Strengthening Data Protection and Governance for AI Applications

Later this year, F5 will add groundbreaking data protection and governance capabilities to the F5 Application Delivery and Security Platform.

Yahoo Finance
Oct 21st, 2026
Telenor AI Factory picks F5 to power sovereign AI service plane on NVIDIA infrastructure

Telenor AI Factory has chosen F5's BIG-IP Next for Kubernetes as the service layer for its NVIDIA-powered sovereign AI infrastructure, F5 (NASDAQ: FFIV) announced on October 21, 2026. The platform helps Norwegian and European organisations use AI services while keeping control over where their data is processed, stored, and accessed. Running on NVIDIA BlueField DPUs, it applies policy, tenant isolation, telemetry, and traffic control directly in the AI service path. Telenor plans to add token-aware governance and more advanced inference traffic optimisation as its commercial services grow. "F5 gives us a policy and traffic-control layer we can build on as we scale services for customers," said Kaaren Hilsen, chief executive officer of Telenor AI Factory.

Channel Post MEA
Oct 12th, 2026
F5 helps service providers modernize critical network services.

F5 helps service providers modernize critical network services. On: October 12, 2026 F5 today announced enhanced cloud-native network functions and new observability capabilities that help service providers modernize critical network services as they move from virtualized infrastructure to Kubernetes and cloud-native architectures. Service providers are under pressure to support growing 5G, edge, IT, and emerging AI workloads, boost efficiency, and maintain the performance, security, and operational control required for carrier-grade services. Moving network functions to Kubernetes lets operators use infrastructure more flexibly but also introduces additional requirements for traffic management, security, lifecycle operations, and visibility across increasingly distributed environments. F5 now accelerates this transition. "Service providers should not have to choose between cloud-native agility and the performance, security, and control required for critical network infrastructure," said Kunal Anand, Chief Product Officer at F5. "BIG-IP Cloud-Native Edition brings proven F5 BIG-IP capabilities into Kubernetes, giving network and cloud operations teams a more consistent way to deploy, secure, observe, and operate 5G, edge, and AI infrastructure at scale." Independent testing by The Tolly Group of selected BIG-IP Cloud-Native Network Functions within BIG-IP Cloud-Native Edition demonstrated substantial infrastructure-efficiency gains in Kubernetes-based DNS and CGNAT workloads compared with virtualized network function deployments. In a DNS scenario, F5 processed 1.9x more queries per second while using 91.5% less CPU. In a CGNAT scenario, F5 delivered comparable throughput while using 79.7% less CPU and 98.5% less memory. A broader cloud-native solution for service providers F5 BIG-IP Cloud-Native Edition extends capabilities from the F5 Application Delivery and Security Platform within Kubernetes-based service provider environments, bringing together complementary capabilities across cloud-native networking, application delivery, security, and observability. BIG-IP Cloud-Native Network Functions extend core BIG-IP network and security services into Kubernetes-native environments, including DNS, CGNAT, network security, subscriber policy enforcement, and traffic management. BIG-IP Next for Kubernetes operates at the Kubernetes network layer, providing networking, application delivery, security, and manageability. BIG-IP eBPF Observability provides kernel-level application and network visibility for troubleshooting distributed environments. Modernizing critical network services for Kubernetes Enhanced F5 BIG-IP Cloud-Native Network Functions provide Kubernetes-native traffic management and security capabilities designed for service provider environments. * Expanded traffic management: Broad Layer 4-7 support, including ingress and egress networking and support for TCP, UDP, HTTP/2, Diameter, SCTP, GTP, and SIP, helps operators move a wider range of network services into Kubernetes rather than limiting modernization to HTTP-based applications. * Subscriber-aware policy enforcement: Operators can dynamically apply quality-of-service (QoS), traffic-shaping, and content-filtering policies based on subscriber and service requirements, supporting differentiated services while maintaining consistent policy enforcement. * Cloud-native lifecycle management: Kubernetes-native deployment and management workflows let teams automate common configuration and lifecycle tasks as network functions move from VM-based to containerized infrastructure. By moving these services into Kubernetes-native deployments, operators can make more flexible use of compute and memory resources, more efficiently using infrastructure as network traffic and service demands grow. Deeper visibility across distributed Kubernetes environments Network, security, application, and platform teams often rely on different tools when troubleshooting the same problem. New F5 BIG-IP eBPF Observability provides a consistent source of application and network telemetry across distributed Kubernetes clusters, enabling teams to examine app behavior, container activity, and network flows together when investigating performance or connectivity issues. * Real-time, low-overhead telemetry: Operations teams gain granular network and app insights across Kubernetes environments without requiring application-by-application instrumentation. * Scalable visibility: Kubernetes-native deployment models and a resource-efficient architecture support visibility across distributed environments, helping teams investigate issues without adding another heavy monitoring layer. * Shared operational context: BIG-IP eBPF Observability provides correlated application and network context to determine whether an issue originates in the application, container, or network to reduce investigation time. Independent validation of cloud-native network functions The Tolly Group tested BIG-IP Cloud-Native Network Functions against virtualized network function deployments in the same Kubernetes environment across two essential service provider workloads. * DNS: F5 processed 1.9x more queries per second with 91.5% less CPU demand and 48% lower average latency than the tested VNF configuration. * CGNAT: F5 delivered comparable throughput with 79.7% less CPU demand, 98.5% less memory consumption, and 82% lower p95 latency than the tested VNF configuration. These results demonstrate how Kubernetes-native network functions can help operators increase workload density and reduce infrastructure requirements for the workloads tested. Extending BIG-IP as service provider infrastructure evolves Service providers have relied on BIG-IP across physical and virtual infrastructure for critical networking and security services. As those environments increasingly incorporate Kubernetes, F5 is extending those capabilities into the architectures operators are adopting while providing a path to maintain familiar operational models and policies. BIG-IP Cloud-Native Edition gives service providers a broader cloud-native solution across traffic management, networking, security, and observability. It also creates opportunities for operators to adopt additional F5 capabilities as their infrastructure evolves across 5G core, edge, IT, and newer workload environments. BIG-IP Cloud-Native Network Functions, BIG-IP Next for Kubernetes, and BIG-IP eBPF Observability address different layers of that transition while helping customers maintain familiar networking, security, and operational models. Availability BIG-IP Cloud-Native Edition and the capabilities highlighted in this announcement are available now for service provider environments.