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Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

2026-05-20 23:52:15 +09:00

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title

Codebase Onboarding

매 한 줄

"매 new engineer 의 first PR 의 ship 의 time 의 minimize — codebase mental model 의 building 의 single biggest leverage point". 2026 의 LLM-augmented onboarding 의 era 에서 의 Claude Code, Cursor, Sourcegraph Cody 의 통한 first-week productivity 의 historical 의 weeks 의 days 로 의 collapse — 매 documentation + tooling + buddy system 의 triplet 의 critical.

매 핵심

매 4 phases

Day 0–1: Environment — repo clone, build, test 의 green
Day 2–5: Map — system architecture, ownership boundary, glossary
Week 2: First PR — small bug fix or doc 의 contribution
Month 1: Ownership — feature 의 lead, on-call participation

매 friction sources (Microsoft 2024 study)

Tribal knowledge (60% of blockers)
Stale documentation (45%)
Build / dev-env setup (30%)
Implicit code conventions (28%)
Domain language gaps (25%)

매 응용

New hire ramp-up 의 5-day → 1.5-day 로 의 acceleration (LLM-assisted).
Acquisition integration — acquired team 의 codebase 의 onboard.
Open-source contributor 의 first-time contributor experience.
Inner-source — cross-team contribution friction 의 reduce.

💻 패턴

CLAUDE.md / AGENTS.md (LLM context primer)

# Project Context

## Stack
- Backend: Python 3.13, FastAPI, Postgres 16, Redis 7
- Frontend: Next.js 15 (App Router), React 19
- Infra: AWS, Pulumi, GitHub Actions

## Conventions
- Async-first; no sync DB calls in handlers.
- Tests: pytest, ≥85% coverage required.
- Commits: conventional commits (feat/fix/chore).

## Domain glossary
- "Account" = billing entity (≠ User)
- "Workspace" = collaboration scope
- "Project" = single deployment unit

## Key files
- `apps/api/main.py` — FastAPI entry
- `packages/db/schema.sql` — canonical schema
- `infra/pulumi/` — IaC

## Onboarding tasks
1. Run `make bootstrap` then `make test`.
2. Read `docs/architecture.md`.
3. Pick a "good-first-issue" label.

`make bootstrap` (one-command setup)

.PHONY: bootstrap test lint
bootstrap:
	@command -v mise >/dev/null || curl https://mise.run | sh
	mise install
	uv sync
	pnpm install
	docker compose up -d postgres redis
	uv run alembic upgrade head
	@echo "Bootstrap complete. Run 'make test' to verify."

test:
	uv run pytest -x --cov=src
	pnpm test

lint:
	uv run ruff check .
	pnpm lint

Architecture Decision Records (ADR)

# ADR-007: Why we chose Postgres over MongoDB
Date: 2024-11-12
Status: Accepted

## Context
We need transactional consistency for billing.

## Decision
Postgres 16 with row-level security.

## Consequences
+ Strong ACID for money flows
- Schema migrations require Alembic discipline

LLM-powered code map

from anthropic import Anthropic

client = Anthropic()

def codebase_summary(repo_files: list[str]) -> str:
    """Generate onboarding-friendly codebase map using prompt cache."""
    response = client.messages.create(
        model="claude-opus-4-7",
        max_tokens=4000,
        system=[
            {"type": "text", "text": "You are an onboarding assistant."},
            {"type": "text", "text": "\n".join(repo_files),
             "cache_control": {"type": "ephemeral"}},
        ],
        messages=[{"role": "user", "content":
            "Produce a 1-page codebase map for a new hire: "
            "entry points, key modules, dependency layers, gotchas."}],
    )
    return response.content[0].text

Buddy system + PR mentoring

@dataclass
class OnboardingPlan:
    new_hire: str
    buddy: str
    week1_tasks: list[str]
    week2_tasks: list[str]
    
    def daily_standup_questions(self) -> list[str]:
        return [
            "어제 의 가장 confusing 의 part?",
            "오늘 의 목표 의 1 of?",
            "block 의 의 의?",
        ]

"First PR by EOD-1" success metric

def first_pr_metrics(hires: list[dict]) -> dict:
    """Lead indicator of onboarding health."""
    return {
        "median_days_to_first_pr": median(h["days_to_first_pr"] for h in hires),
        "median_days_to_first_merge": median(h["days_to_first_merge"] for h in hires),
        "30d_active_pct": sum(h["still_active_30d"] for h in hires) / len(hires),
    }

매 결정 기준

상황	Approach
Greenfield team	Heavy CLAUDE.md, light ADR
Legacy codebase	Strong ADR archive, code map LLM, buddy system
Open source	Detailed CONTRIBUTING.md, good-first-issue queue
Acquired team	Pair programming weeks 1-2, glossary front-loaded
Remote-first	Async docs first, video walkthroughs

기본값: modern team 의 default — CLAUDE.md + make bootstrap + buddy + first-PR-by-EOD-3.

🔗 Graph

부모: Team Culture & Onboarding (팀 문화 및 온보딩)
변형: Program Comprehension Strategies
응용: Pull_Request_and_Issue_Tracking
Adjacent: GIT_PROTOCOL · Process_Reflection_Template

🤖 LLM 활용

언제: codebase summary generation, onboarding doc 의 audit (gap detection), new-hire Q&A bot. 언제 X: tribal knowledge 의 LLM 의 fully replace 의 X — buddy system 의 still 의 essential.

❌ 안티패턴

"Read the code": docs 의 absence 의 excuse 의 X. 매 entrypoint 의 explicit.
Stale README: bootstrap step 의 not-working 의 first-day blocker.
Trial-by-fire: 큰 critical 의 task 의 week-1 의 assign — burnout 의 amplify.
Single buddy bottleneck: buddy 의 vacation 의 의 onboarding 의 stall.

🧪 검증 / 중복

Verified (Microsoft 2024 Developer Velocity Lab; Stripe Increment Magazine onboarding issue).
신뢰도 A.

🕓 Changelog

날짜	변경
2026-05-08	Phase 1
2026-05-10	Manual cleanup — phases, CLAUDE.md, bootstrap, ADR, LLM code map

6.3 KiB Raw Blame History Unescape Escape