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Five9 is seeking a Senior Software Engineer to rapidly modernize our internal platform tooling and drive full-stack engineering maturity. This is primarily a hands-on developer role - you will own the transformation of existing internal tools to be 12-factor compliant, building polished front-end interfaces alongside robust back-end services, and embedding world-class telemetry (Grafana, Prometheus, Loki) throughout the platform. 

You will also provide architectural direction for software supporting our Infrastructure-as-a-Service (IaaS) platforms, orchestration systems, and platform engineering initiatives. You will champion modern 12-factor application design, transition legacy pipelines into Kubernetes-native GitOps workflows, and mentor mid-tier developers - all while keeping shipping velocity high. 

This is a private cloud/on-premise infrastructure position. We build and manage our own bare-metal and virtualized data center footprint. Do not apply if your experience is exclusively in public cloud environments (AWS, GCP, or Azure). Candidates must have hands-on, practical experience with physical/on-premise hardware orchestration, hypervisors, and managing Kubernetes on bare-metal/private-cloud layers. 

Key Responsibilities 

• 12-Factor Application Modernization (Primary Focus) 

  • Rapidly audit and refactor existing internal tools and services to strictly comply with 12-factor application principles - configuration via environment, stateless processes, explicit dependency declarations, disposability, and dev/prod parity. 
  • Own end-to-end delivery of modernized services: back-end APIs (Go/Python) paired with clean, functional front-end interfaces (React or Vue) that surface platform data and controls to internal users. 
  • Decompose monolithic or ad-hoc scripts into properly structured, independently deployable services with clearly defined interfaces. 
    
• Full-Stack Development
   
  • Build and maintain internal web UIs using modern front-end frameworks (React or Vue) - dashboards, tooling consoles, and operational interfaces that teams actually want to use. 
  • Design and develop robust REST/gRPC back-end APIs in Go and Python following clean architecture patterns. 
  • Ensure front-end and back-end components are instrumented end-to-end with traces, metrics, and structured logs from day one. 

• Observability & Telemetry  

  • Own the platform observability stack: design, implement, and continuously improve our Grafana, Prometheus, and Loki deployment for all internal services. 
  • Define and enforce instrumentation standards - every new or refactored service must ship with meaningful RED metrics, structured JSON logs forwarded to Loki, and distributed traces. 
  • Build and maintain Grafana dashboards and alerting rules that provide actionable signal for on-call engineers; define and manage SLIs/SLOs across critical platform services. 
  • Implement Prometheus exporters for custom internal services and integrate alerting with PagerDuty or equivalent. 
  • Drive log aggregation strategy with Loki - label taxonomy, retention policies, and LogQL query libraries for common operational queries. 

• Architecture & API Development 

  • Design, develop, and support robust APIs and automation services from scratch using Go and Python. 
  • Conduct architecture reviews and enforce design standards across the platform engineering team. 
  • Drive the modernization of legacy platform components with a bias toward simplicity and operational transparency. 

• CI/CD & GitOps Transformation 

  • Lead the refactoring of existing deployment pipelines to be fully Kubernetes-native. 
  • Define and implement disciplined software release cycles using GitLab CI/CD and ArgoCD for GitOps-driven deployments. 
  • Establish automated testing gates (unit, integration, contract) as hard requirements in the pipeline. 

• Technical Leadership & Mentorship 

  • Mentor mid-tier developers, establish coding standards, enforce peer reviews, and reduce technical debt. 
  • Improve engineering maturity across the team - instill a culture of instrumentation-first development where observability is never an afterthought. 
  • Maintain and overhaul technical documentation; make it easy for new engineers to onboard and contribute. 

• Infrastructure as Code (IaC) 

  • Drive enterprise-grade infrastructure automation and orchestration using Ansible, AWX, and Terraform. 
  • Oversee the secure and highly available architecture of core lifecycle services such as Harbor and GitLab. 
    

Required Qualifications

• • 8+ years of software engineering with proven technical leadership and architectural design experience. 
  • Full-Stack Development: Strong front-end skills (React or Vue) alongside deep back-end experience - you are comfortable owning the full request lifecycle from UI click to database. 
  • Observability Expertise: Deep, hands-on expertise with Grafana, Prometheus, and Loki - not just deploying them, but designing dashboards, writing PromQL/LogQL, building exporters, and enforcing instrumentation standards across a team. 
  • 12-Factor Mastery: Demonstrated experience auditing and refactoring real applications to be 12-factor compliant in a production environment. 
  • Programming: Deep expertise in Python and Go (Golang) for building distributed systems and enterprise APIs. 
  • Kubernetes Certification: CKA or CKAD strictly required (CNCF). Hands-on experience with on-premise clusters, preferably Rancher. 
  • Cloud & Infrastructure: Strong experience with OpenStack, private cloud environments, and foundational infrastructure networking. 
  • Automation & Tooling: Extensive experience with Ansible, AWX/Tower, Harbor, and GitLab. 
  • Modern Delivery: Proven expertise in SDLC practices, code refactoring, automated testing, and GitOps (ArgoCD). 

Preferred Qualifications 

• • Experience designing and shipping internal developer portals or operational tooling used by platform and SRE teams. 
  • Hands-on experience with distributed tracing (Jaeger, Tempo, or OpenTelemetry) to complement the Grafana/Prometheus/Loki stack. 
  • Deep practical experience implementing SRE principles at large-scale enterprise. 
  • Familiarity with Bare Metal as a Service (BMaaS) provisioning and integration. 
  • Experience navigating ITIL change management processes within highly automated CI/CD frameworks. 
  • Experience establishing engineering standards and driving a culture of accountability and continuous improvement.