Overview
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Course Setup and the Incremental Ladder
Why "Commits to Pipelines"
How to Use This Course
The Incremental Ladder (Step 0 -> Step 7)
The Course Lenses
Diagram Legend and Notation Types

Version Control as the Source of Truth
Why VCS Anchors CI/CD
Changesets, Diffs, and Commit History
Branches, Tags, and Release Lines

Branching Models and Workflows
Trunk-Based vs Git-Flow-Like Models
Feature, Release, and Hotfix Branches
Trade-Offs: Speed, Stability, and Workflow Complexity

Repository Structures: Mono vs Poly
Monorepos, Polyrepos, and Hybrids
Impact on Builds, Pipelines, and Tooling
Code Ownership and Modularization

Commit Discipline and Code Review
Atomic Changes and Commit Hygiene
Review Workflows and Approval Patterns
Messages, Issue Links, and Traceability

Diagramming Developer Workflows
Commit-to-Merge Flows
Branching Diagrams and Release Trains
Mapping Repos to Teams and Services

Build Systems and Toolchains
Build Tools and Orchestration
Incremental vs Full Builds
Reproducibility and Determinism

Dependency Management
Manifests and Lockfiles
Version Ranges vs Pinning
Caches, Registries, and Security

Artifact Types and Packaging
Artifact Families
Versioning and Immutability
Deployable Units

Artifact Repositories and Promotion
Repositories for Packages, Images, and Binaries
Retention and Immutability Semantics
Promotion Flows

Build & Artifact Observability
Build Health Metrics
Dependency Graph Visibility and BOMs
Hotspots and Bottlenecks

CI Fundamentals
CI vs Nightly Builds
Builds and Tests on Every Change
Failing Fast as a System Property

Pipeline-as-Code
Declarative vs Imperative Pipelines
Shared Libraries and Templates
Versioning and Testing Pipeline Configurations

Triggering and Fan-Out
Trigger Types
Fan-Out for Multi-Service Change
Storming and Redundancy Control

Pipeline Stages and DAGs
Stage Design
DAG Modeling
Resource Management

CI Infrastructure
Runners, Agents, and Executors
Scaling Builds
Multi-Tenant CI Clusters

CI Health, Limits, and Anti-Patterns
Broken Main and Red Builds
Long Pipelines and Developer Frustration
Keeping CI Green

Test Taxonomy and the Test Pyramid
Layers of Tests
Pyramid vs Ice Cream Cone
Choosing a Balanced Portfolio

Designing Testable Systems
Seams, Contracts, and Dependency Injection
Test Doubles
Contract Tests for APIs and Services

Data, Environments, and Isolation
Test Data Management
Ephemeral vs Shared Environments
Cleanup and Containment

Test Execution in Pipelines
Parallelization and Sharding
Change-Impact Selection
Smoke vs Regression vs Full Sweep

Flaky Tests and Reliability
Detecting and Triage Workflows
Quarantine and Thresholds
Culture and Tooling

Quality Gates and Metrics
Coverage with Caveats
Quality Gates
Balancing Speed and Quality

From CI to CD
Continuous Delivery vs Continuous Deployment
Promotion-Based Pipelines
Manual Gates vs Full Automation

Environment Topologies and Promotion
Environment Lanes: dev, test, staging, prod and what "prod-like" is actually for
Promote vs Rebuild: artifact integrity versus environment-specific compilation and the risks of divergence
Drift and Drift Detection: preventing the environment boundary from silently changing the system

Deployment Mechanisms
Push vs Pull Deployments: control boundaries and how failure propagates
Deployment Primitives: conceptual orchestrators, rollout units, and state reconciliation
Configuration and Secret Injection: making runtime variability explicit, auditable, and reversible

Release Strategies
Rolling, Blue-Green, Canary: choosing a rollout topology that matches your failure tolerance
Feature Flags and Dark Launches: decoupling deploy from release to reduce blast radius
Rollback and Roll-Forward: designing recovery paths that work under stress

Progressive Delivery and Observability
Guardrails and SLO-Based Safety: using live signals as release constraints
Automated rollback triggers: thresholds, noise, and avoiding control-plane flapping
Release health views: connecting deploy events to user impact with minimal ambiguity

Multi-Service and Multi-Region Releases
Coordinated Microservice Releases: dependency ordering and minimizing cross-service deadlocks
Compatibility and Contracts: version skew, backward compatibility, and safe partial rollout
Region-Wise Rollouts: global coordination, regional blast radius, and operational pacing

What Is an Internal Developer Platform (IDP)?
Platform as Product for Developers: making the "easy path" the safe and supported path
Platform Layers: CI/CD, runtime, observability, catalogs and how they compose into one experience
Reducing Cognitive Load: avoiding "YAML fatigue" by moving complexity behind stable interfaces

Golden Paths and Paved Roads
Opinionated Defaults: why standardization is a reliability strategy, not only a productivity one
One Obvious Way: defining a canonical service lifecycle from build to deploy
Flexibility Without Fragmentation: supporting exceptions without creating a second platform

Scaffolding and Service Creation
Service Templates: repo + pipeline + infra skeleton as a repeatable boundary package
Bootstrapped Security and Observability: shipping "secure and observable by default" as platform policy
Onboarding and First-10-Minutes Experience: designing time-to-first-success as a platform KPI

Developer Portals and Catalogs
Ownership and Metadata: service catalogs as the map that makes accountability possible
UI for Pipelines, Deploys, Incidents, Docs: making platform state visible and navigable
Integrating Runbooks and ADRs: connecting automation to human decision-making during incidents

Platform Extensibility
Plugin Models: extension without forking the platform's core
Integrating Third-Party Tools: scanners, APM, and ecosystem components as controlled dependencies
Guardrails on Customization: preventing local optimization from breaking platform invariants

Platform Metrics and Developer Experience
Delivery Performance Metrics: lead time, deploy frequency, change fail rate, MTTR as system outcomes
DX Metrics: wait time, friction, satisfaction and how they predict platform adoption
Metrics into Roadmaps: using evidence to choose investments and retire low-value complexity

Governance and Policy in Pipelines
Policy-as-Code Boundaries: expressing required stages and constraints in machine-enforceable form
Approvals and Separation of Duties: designing human checks that resist collusion and reduce mistake risk
Least Privilege in CI/CD: minimizing what pipelines can do and constraining blast radius

Secrets, Credentials, and Supply Chain Security
Secret Storage, Rotation, Injection: treating secret movement as a privileged data plane
Provenance and Signing: code signing, artifact signing, and why "who built this" matters
Scanning Code, Dependencies, Images: catching supply-chain risk where it enters the pipeline

Compliance Requirements in CI/CD
Traceability from Commit to Deploy: constructing an evidence chain that survives audits and incidents
Change Management and Audit Trails: approvals, justifications, and immutable records as system features
Evidence Generation: building automated compliance outputs without turning governance into manual toil

Guardrails vs Gates
Preventative vs Detective Controls: choosing where to stop bad change versus where to detect and respond
Soft vs Hard Enforcement: rollout strategies that increase safety without creating a shadow process
Autonomy vs Control: maintaining developer flow while meeting regulatory and security obligations

Incident & Vulnerability Response via Pipelines
Emergency Change and Break Glass: designing exceptional paths that remain auditable and safe
Coordinated Patching via CI/CD: scaling response across fleets without losing correctness
Backports and Multiple Release Lines: keeping long-lived versions secure without endless divergence

Platform Architecture: Control Planes and Data Planes
Control Plane Concepts: configuration, policy, and state as the platform's governing surface
Data Plane Workloads: builds, tests, deployments and the isolation requirements they impose
One Engine or Many: composing pipeline engines and clusters without losing a unified experience

Multi-Tenancy and Scale in CI/CD
Tenancy Models: team, project, org boundaries and what can fail together
Fair Scheduling and Noisy Neighbor Control: quotas, prioritization, and protecting critical paths
Rate Limits and Resource Governance: preventing platform overload from becoming company-wide outage

Platform Teams and Operating Models
Platform-as-a-Product: roadmaps, support, and lifecycle management for internal users
Roles and Interfaces: platform PMs, SREs, DX engineers, advocates and how responsibility is partitioned
Feedback Loops to Roadmap: turning developer pain into prioritized platform work

Integrating CI/CD with the Rest of the Ecosystem
Observability, Incidents, On-Call: connecting delivery events to operational reality
Tickets, Docs, Flags, Runtime Config: integrating adjacent control systems without duplication
Data and AI Workflows in CI/CD Contexts: extending pipeline thinking beyond application code (conceptual)

Migration and Modernization
From Scripts to Standard Pipelines: defining target patterns and migrating without halting delivery
Incremental Migration of Legacy Apps and Repos: sequencing changes to preserve trust
Coexistence Strategies: running old and new platforms in parallel without fragmenting governance

Case-Style Reference Architectures
Small Org Reference: simple pipelines and lightweight platform boundaries
Mid-Size Reference: multi-team IDP with standardized golden paths and shared services
Large Enterprise Reference: multi-region CI/CD with strong governance and regulated workload support

Evolution and Next-Gen Developer Platforms
Continuous Everything: integrating security, compliance, and broader workflows into delivery systems
AI-Assisted Development and Self-Healing Pipelines: conceptual capabilities and the new failure modes they introduce
Long-Term Maintenance: deprecation, compatibility, and evolving platforms without breaking trust

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Layers of Tests

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