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All 31 posts grouped by category
Web Development (1)
Web Development › Python: FastAPI (2)
Web Development › OS Settings (2)
Cloud & Architecture › AWS (5)
- [AWS] NAT Gateway How-To & Setup Guide — Private Subnet Internet & Cost Optimization 2026-02-14
- [AWS] Cutting Infrastructure Costs by 55% — Graviton (ARM) Migration & Fixed-Cost Optimization 2026-02-12
- [AWS] EC2 SSH Error — Fixing UNPROTECTED PRIVATE KEY FILE (.pem chmod 400) 2026-02-08
- [AWS] Cutting NAT Gateway Costs — Building a NAT Instance with iptables (Part 2) 2024-12-29
- [AWS] Cutting NAT Gateway Costs — Building a NAT Instance from an AMI (Part 1) 2024-12-28
Cloud & Architecture › Server Setup (1)
Cloud & Architecture › Database (1)
Reviews › Career (6)
- Samsung Electronics Coding Test — Recurring Implementation Modules (Java) 2024-10-08
- Samsung Electronics Coding Test — 5 Attempts Recap (Samsung Research · Innovation Center · Device Platform) 2024-10-08
- [New Grad] SK AX (formerly SK C&C) — Coding Test + Interview (Final Offer) Recap (2023 H2) 2023-12-05
- [New Grad] Hyundai Motor — CarCloud Role — Coding Test + 1st Interview (Rejected) Recap (2023 H1) 2023-05-12
- [New Grad] LG Electronics — Coding Test + 1st/2nd Interview (Rejected) Recap (2022 H2) 2022-12-15
- [New Grad] KT DS — Coding Test + Interview (Final Offer) Recap (2021 H2) 2021-12-22
Reviews › Grad School (2)
Reviews › Conferences (2)
Study › System Design Book (1)
Error Docs › Python (1)
Data Analysis & Statistics (7)
- Understanding Hypothesis Testing — Test Statistic, Null/Alternative, p-value, Significance Level, Critical Value 2026-05-27
- Implementing t-Tests in Python with SciPy — One-Sample, Two-Sample (Student's·Welch's), Paired 2024-11-05
- The Central Limit Theorem — Definition, Experiments, and Uses 2024-11-03
- Testing Means — the t-test (One / Two: Student's·Welch's / Paired) 2024-11-03
- Confidence Intervals — Meaning, Intuition, and a Common Misconception 2024-10-13
- What Are Degrees of Freedom — Why We Divide by n-1 to Estimate Variance 2024-09-30
- Uncertainty, Variability & Variance — Understanding the Nature of Probability 2024-09-30