CI/CD & Delivery Case Studies
Real-world CI/CD & Delivery case studies: what happened in production, the architecture behind it, the numbers and the lessons to take to your own team.
How a 300-Engineer Monorepo Cut CI Time by 78% with Remote Caching and Affected-Only Builds
A fast-growing SaaS platform tamed a sprawling monorepo by combining Nx remote caching with affected-graph builds, slashing median CI from 47 min to 10 min and saving $180k/year in compute.
CI/CD & Delivery · advanced · 12 min read
How a B2B SaaS Platform Migrated 200 Services to GitOps with Argo CD
A 120-engineer SaaS company replaced ad-hoc kubectl and CI-push deployments with Argo CD GitOps across 200 services, cutting deployment failures by 70% and mean time to recovery from 45 minutes to under 5.
CI/CD & Delivery · intermediate · 12 min read
How a B2B SaaS Team Cut CI Pipeline Time from 45 Minutes to 8
A 120-engineer SaaS team slashed CI from 45 min to 8 min using layer caching, parallel test sharding, and affected-test selection — without rewriting their test suite.
CI/CD & Delivery · beginner · 12 min read
How a B2B SaaS Team Cut Failed Deployments by 80% with Canary Releases and SLO-Driven Rollback
A 120-engineer SaaS company replaced big-bang deploys with canary releases gated by error-budget burn, cutting user-facing incidents from 14 to 3 per quarter and mean time to recovery from 47 to 8 minutes.
CI/CD & Delivery · intermediate · 12 min read
Knight Capital 2012: How an Incomplete Deployment and a Reused Flag Lost $460 Million in 45 Minutes
A stale deployment flag reactivated dead code on one of eight servers, causing Knight Capital's trading system to flood markets with unintended orders and lose $460M in 45 minutes.
CI/CD & Delivery · beginner · 12 min read
The Cloudflare July 2019 Outage: How One Regex Took Down a Global CDN
A single catastrophic backtracking regex in Cloudflare's WAF rules consumed 100% CPU across every PoP worldwide, dropping 82% of HTTP traffic for 27 minutes.
CI/CD & Delivery · intermediate · 12 min read
The Cloudflare November 2025 Outage: How a Database Permission Change Broke Global Proxy Traffic
A database ACL change caused a config file to double in size, crashing Cloudflare's proxy on 132 PoPs for 66 minutes. The lesson: schema-level gates matter as much as code review.
CI/CD & Delivery · advanced · 12 min read
The CrowdStrike July 2024 Outage: How a Single Content Update Crashed 8.5 Million Windows Machines
A logic error in a CrowdStrike Falcon sensor content update caused 8.5 million Windows hosts to BSOD on boot, exposing the danger of pushing untested kernel-level updates without staged rollouts.
CI/CD & Delivery · intermediate · 12 min read