// DevOps · Systems · Reliability

Cassidy Marble

Building infrastructure that never sleeps · 10+ years designing, scaling, and automating high-availability systems across cloud, containers, and bare metal.

inquiry@marble.sh github.com/marble-sh ↗ LinkedIn ↗
01 :: About

Who I Am

I'm a Senior DevOps & Systems Engineer with over a decade of experience across startup and enterprise environments. I specialize in building infrastructure that scales, automates the tedious, and keeps production running without drama.

From Kubernetes cluster ownership to ML-driven incident response, I bring a reliability-first mindset to every layer of the stack: infrastructure-as-code, CI/CD pipelines, embedded systems, and everything in between.

02 :: Technical Arsenal

Core Competencies

Containerization & Orchestration

Production-grade Kubernetes ownership with 100% uptime track record. Deep Docker ecosystem expertise.

Kubernetes Docker Dynatrace

CI/CD & Automation

Custom Groovy pipelines serving 10k+ repos. GitOps-driven Ansible Galaxy collections and deployment automation.

Jenkins GitOps Ansible

Cloud & Infrastructure

Hybrid on-prem/cloud deployments at scale. Infrastructure-as-code with automated provisioning.

AWS IaC Linux

Databases

Redis Cluster at sub-10ms latency under millions of concurrent users. Full relational + NoSQL coverage.

PostgreSQL Redis MongoDB

Programming

Polyglot engineer comfortable from systems-level Rust/Go to JVM Groovy and scripting automation in Bash.

Go Rust Python Java Bash

Security & Embedded

IoT/embedded systems, HID access controls, perimeter security, and ML-driven threat detection platforms.

IoT ML Ops Cisco
03 :: Experience

Career History

2026–Present
Contract · Remote
Team Lead & Backstage SME
Internal Developer Portal Modernization
  • Led the architectural overhaul of a mission-critical Backstage-based portal, migrating a 106k-LOC monolithic codebase to an isolated plugin architecture with 80% test coverage and zero-downtime cutover.
  • Decomposed 24 plugins into 8 topic-specific workspaces with zero cross-plugin coupling; replaced a fragile Business-Unit abstraction with GitHub org as the source of truth.
  • Rebuilt RBAC as a two-tier policy module, enabling config-defined admin teams and org-scoped visibility; eliminated a 50% PR rework rate by removing shared-file merge conflicts.
  • Authored comprehensive technical documentation and conducted a workshop on AI-assisted migration, enabling the team to sustainably extend the platform.
2021–2025
Arizona, USA
Senior DevOps Engineer &
Systems Engineer (Reliability)
  • Built and maintained custom Groovy pipelines for Jenkins, generating build/deploy jobs for 10k+ repositories across 100+ developer teams.
  • Owned production Kubernetes cluster availability, achieving 100% uptime with 24/7 support using Dynatrace observability and K8s metrics.
  • Drove company-wide DevOps adoption via repository templates, cross-language best-practice tooling, and embedded team collaboration.
  • Designed and maintained a private Ansible Galaxy collection leveraging CI/CD and GitOps for cloud and infra automation.
  • Led ML-driven automated support system for real-time threat detection and service downtime response.
2017–2020
Wisconsin, USA
Senior Software &
Site Reliability Engineer
  • Migrated monolithic search to a Kubernetes microservices architecture, improving scalability and fault tolerance.
  • Implemented CI/CD pipelines that reduced deployment time by 60% and eliminated manual intervention.
  • Designed Redis Cluster caching achieving sub-10ms latency under millions of concurrent users.
  • Built monitoring dashboards and automated failover scripts, cutting search-related incidents by >70%.
2014–2016
Illinois, USA
Embedded Systems &
Security Infrastructure Engineer
  • Built automated camera-audit framework reducing manual inspection from weeks to minutes.
  • Designed high-throughput video-capture servers integrated with Cisco edge switching.
  • Programmed and maintained IoT/embedded systems: elevator controls, HID access, and perimeter security gateways.
2011–2014
Illinois, USA
IT & Infrastructure Lead
  • Designed and deployed Linux-based DNS and PXE/Netboot infrastructure with automated provisioning.
  • Built a custom lightweight Linux distribution with centralized logging, printing (CUPS), and auto-recovery.
  • Led campus network overhaul: CAT-6 cabling, VLAN segmentation, HP managed routing.
  • Extended hardware lifecycle, saving ~$30k in refresh costs and eliminating Windows licensing dependencies.
04 :: Recent Work

Platform Engineering & Internal Developer Portals

As team lead, I spearheaded the migration and modernization of a large-scale Backstage-based Internal Developer Portal — cutting technical debt, improving developer velocity, and establishing a clean, plugin-driven architecture.

Backstage Portal Refactor & Migration

Led a complete architectural overhaul of a mission-critical internal developer portal, migrating from a monolithic 106k-LOC legacy codebase to an isolated plugin-based architecture with 80% test coverage and zero production downtime.

Read the deep dive

Highlights

  • 100% uptime during the cutover
  • Reduced custom code from 106k → 9k LOC
  • 31% → 80% test coverage achieved
  • 12+ plugin repositories isolated and published