Big-O explained with growth numbers, 8 worked Java examples, amortized analysis and the master theorem, plus cheat sheets for data structures, sorts and Java collections.
30 technical questions (Java, OOP, SQL, OS, networks, coding) and 15 HR questions with sample answers, plus how the rounds work, a project STAR template and a 30-day plan.
Spring Security 7 JWT auth the current way: SecurityFilterChain, JwtEncoder login, resource server validation, roles, @PreAuthorize, refresh token rotation, tests and 12 interview questions.
Why handwritten notes work for data structures and algorithms, what belongs on each page, two sample pages to copy, and a six-week plan to build and revise your own set.
The data structures and algorithms that coding interviews actually ask about, the questions that come with each, and the dozen patterns that solve most problems, with Java examples.
The SQL questions data analyst interviews ask most, each with a working query: joins and anti-joins, WHERE vs HAVING, NULLs, window functions, top N per group, month-over-month growth and cohorts.
What full-stack developer interviews test at each layer, from the JavaScript event loop and React hooks to REST, JWT, SQL, system design and Docker, with sample answers and a four-week plan.
12 scenario-based Java threading interview questions: what the code prints, where the bug is and how to fix it, from lost updates and deadlocks to ThreadLocal leaks and virtual-thread pinning.
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