DevSecOps: Layman to MAANG-Competitive

Phase 0 · Days 1–6

How Computers Work + OS Essentials

CPU, memory, kernel, and the OS primitives that explain every container behavior you'll meet later.

Phase 1 · Days 7–14

Linux + Bash Scripting

Filesystem, permissions, SSH, systemd, and Bash automation — provisioning and hardening Linux from scratch.

Phase 2 · Days 15–23

Networking: Life of a Packet

OSI, TCP/UDP internals, DNS, HTTP, TLS, and load balancing — narrating the full life of a packet.

Phase 3 · Days 24–26

Git Like a Professional

Commit, branch, merge, rebase, stash, bisect, hooks, and trunk-based workflows.

Phase 4 · Days 27–31

Python (or Go) for Automation

Scripting automation in Python, plus enough Go to read the tools you use every day.

Phase 5 · Days 32–38

Docker

Images, layers, namespaces, cgroups, Compose, and multi-stage builds — containerizing the real stack.

Phase 6 · Days 39–41

Docker Internals

What `docker run` actually does under the hood — OCI, containerd, runc, and raw namespaces.

Phase 7 · Days 42–46

Distributed Systems Fundamentals

Consensus, quorums, replication, and delivery semantics — the theory that explains every distributed tool that follows.

Phase 8 · Days 47–56

Kubernetes Core

The Kubernetes control plane, workloads, and self-healing, from etcd's Raft quorum to rollout strategies.

Phase 9 · Days 57–61

Kubernetes Networking

Services, Ingress, CoreDNS, NetworkPolicies, and the CNI landscape.

Phase 10 · Days 62–64

Kubernetes Storage

Persistent volumes, CSI, dynamic provisioning, and why StatefulSets aren't a backup strategy.

Phase 11 · Days 65–69

Kubernetes Security

RBAC, Pod Security Standards, admission control, and real secrets management.

Phase 12 · Days 70–73

Helm + K8s Distributions

Helm charts and templating, plus an honest comparison of Kubernetes distributions.

Phase 13 · Days 74–77

GitOps: ArgoCD

GitOps with ArgoCD — Git as the source of truth for what is actually running.

Phase 14 · Days 78–84

CI/CD + Shift-Left Security

CI/CD with security gates built in — secrets scanning through DAST, failing builds on real risk.

Phase 15 · Days 85–92

PostgreSQL + Database Internals

PostgreSQL from indexes and EXPLAIN ANALYZE down to WAL, MVCC, and the query planner.

Phase 16 · Days 93–98

Redis + Messaging

Redis caching/locking patterns and RabbitMQ/Kafka messaging, applying Phase 7's delivery semantics.

Phase 17 · Days 99–108

Observability: Metrics, Logs, Traces

Metrics, logs, and traces — Prometheus, Grafana, Loki, OpenTelemetry, and SLO-driven alerting.