Backtest result tables are usually pre-tax. We build a Python backtesting engine that includes fees and three types of taxes, lay out the rules and pass criteria before showing the results, and demonstrate how to evaluate it using only later periods, with the actual code and results.

When you run Claude Code unattended, the person who would normally approve and monitor it is gone. This shows how to fill those two roles with hooks, skills, headless `claude -p`, scheduled runs, permission allowlists, review gates, and usage budgets, using excerpts from operational files that run every day and examples of failures.

Everyone gives a similar answer to the first question in a technical interview. The difference comes in the follow-up questions. For each of 12 common Spring/JPA interview questions, we map out three levels of follow-up questions in advance and include key test code and expected results to verify each answer.