Phase 0 — GNU/Linux, Git, Python Internals & Testing

Welcome to Phase 0. Before touching web frameworks or distributed queues, a mid-level backend engineer must own their runtime environment: Linux processes and streams, Git's internal DAG, Python's memory/object model, strict typing, and deterministic automated testing.

Modules & Lessons

01 — GNU/Linux & OS Fundamentals

• 01 — Processes, File Descriptors, Exit Codes & Signals
• 02 — Filesystem, Inodes, Permissions & /proc Inspection
• 03 — Shell Stream Pipelines & Server Diagnostics

02 — Git Internals & Engineering Workflow

• 01 — Git Object Model: Blobs, Trees, Commits & DAGs
• 02 — History Hygiene: Interactive Rebase, Bisect & PR Discipline

03 — Python Memory, Object Model & Type System

• 01 — Object References, Mutability, Recycling & Memory Leaks
• 02 — The Python Data Model, Iterators & $O(1)$-Memory Generators
• 03 — Strict Typing, Generics, Protocol & Runtime Boundaries
• 04 — Context Managers (with), RAII & Exception Hierarchies

04 — Automated Testing & Verification

• 01 — Deterministic Unit Testing, AAA & Fixtures
• 02 — Dependency Inversion, Fakes vs Mocks & Boundary Testing

Capstone Milestone: pulseforge/ v0.1

At the end of Phase 0, you will complete PulseForge v0.1: an $O(1)$-memory streaming structured log parser, strict schema validator, and CLI diagnostic runner backed by a full unit test suite.