Software Engineering & Language Mastery Portal

Welcome to the unified knowledge portal. This platform brings together comprehensive study notes, executable C# and SQL implementations, architecture blueprints, and tri-lingual language drills.

TIP

Obsidian Graph View: Press Ctrl+G or tap the Floating Graph icon (FAB dock) to open the interactive Obsidian Graph Modal for visual note exploration.

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📌 Focused Learning Tracks

🧠 Data Structures & Algorithms

• 04 DSA Solutions Hub: NeetCode 150 & LeetCode Solution Hub
• LeetCode Master Catalog: LeetCode C# Solution Suite
• NeetCode 150 Track: NeetCode 150 Master Track
• Core DSA Theory: Mastering Big O & Algorithmic Complexity
• Interview Cake C#: Interview Cake 37 Problem Solutions

⚙️ Backend & System Architecture

• Backend Engineering Guide: Backend Developer Master Roadmap & Guide
• System Design Case Studies: 12 System Design Architectures
• SQL Problem Solving: LeetCode & HackerRank SQL

🌐 Tri-Lingual Language Mastery

• English: IT Vocab, STAR Behavioral Prep, CEFR C1/C2 Drills
• Japanese: JLPT N5 & N4 Grammar, Kanji, Daily Dialogues
• Mandarin: Pinyin Tone Auditing, Stroke Order, Conversational Drills

🏆 Anthropic Claude Certifications Track

• Claude Certified Associate (CCAO-F):
  • Prompt Engineering & Messages API Architecture
  • XML Tagging Conventions & Boundary Isolation
  • Sampling Parameters & Autoregressive Control
  • Constitutional AI & Safety Guardrails
  • 30-Question Foundations Mock Exam (Pearson VUE)
• Claude Certified Developer (CCDV-F):
  • Claude Messages API, Streaming & Token Lifecycle
  • Model Context Protocol (MCP) Core Architecture
  • Tool Use & Function Calling Engineering
  • Claude Code CLI, Prompt Caching & Cost Optimization
  • 35-Question Developer Mock Exam (Pearson VUE)
• Claude Certified Architect – Foundations (CCAR-F):
  • Agentic Architecture Patterns & Workflow Orchestration
  • RAG vs. 200K+ Long-Context Architecture Economics
  • Structured Outputs, JSON Schema Enforcement & Determinism
  • LLM Evaluation Harnesses, Benchmarks & LLM-as-a-Judge
  • 40-Question Architect Foundations Mock Exam (Pearson VUE)
• Claude Certified Architect – Professional (CCAR-P):
  • Enterprise Security, Compliance & Multi-Tenant Isolation
  • Enterprise Multi-Agent Systems & Deadlock Prevention
  • Enterprise Cost, Latency Governance & Batch Processing
  • Fine-Tuning, Prompt Distillation & System Optimization
  • 50-Question Master Architect Mock Exam (Pearson VUE)

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🏷️ Domain Tag Matrix

Explore knowledge nodes across the graph by category:

Domain	Popular Tags
DSA & Algorithms	dsa · leetcode · neetcode-150 · hash-map · sliding-window · dynamic-programming
Backend & Architecture	backend · csharp · dotnet9 · system-design · sql
Languages & Communication	english · japanese · mandarin

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🗂️ Core Content Map

Category	Description	Primary Data Source
Data Structures & Algorithms	13 Core Modules, 10 Advanced Modules, C# Unit Tests	01_DSA/01_theory_and_patterns/, 01_DSA/02_dsa_solutions/
Interview Cake Solutions	37 Executable C# Algorithm Solutions	01_DSA/03_interview_cake/
SQL & Database Benchmarks	PostgreSQL Schemas, LeetCode SQL & HackerRank	02_Technical_Skills/03_sql_solutions/
Backend & Infrastructure	27 Technical Skill Tracks (.NET, Java, C++, Distributed Systems)	02_Technical_Skills/01_theory_and_concepts/
System Design Solutions	TinyURL, Rate Limiter, Key-Value Store, Chat System, etc.	02_Technical_Skills/02_system_design_solutions/
Languages (EN / JP / CN)	English Technical Communication, Japanese N5/N4, Mandarin	03_Languages/

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