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Zeni Study
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    • Learn Python In 7 Days
      • Day 1 : Variable + if/else
      • Day 2: Loops
      • Day 3 : Array + String
      • Day 4 — Functions
      • Day 5 — Dictionaries - Hashmap
      • Day 6 — Files & Errors
      • Day 7 — Mini Project & Programmer Thinking
    • Machine Coding:
      • Day 1 — Bank account + Wallet :
      • Day 2 : RateLimiter + seat booking
      • Day 3 : Library Management + Classroom Attendance System
      • Day 4 : Bank account and notification system.
      • Day 5 : Key-value and payment processor.
      • Day 6 : Discount engine + Seat booking( in depth)
      • Day 7: Parking lot System :
    • Machine coding extended:
      • Day 7.5 — Parking Lot (Constraint-Heavy Variant)
      • Day 8 : Order + Payment System
      • Day 8 — Extension Round (Mid-Interview Change)
      • Day 9 — Ticket Booking with Expiry (Simulated Time)
      • Day 9 — Extension Round (Seat Lock Ownership + Forced Unlock)
    • SQL + DB Thinking course
      • Day 1 — Tables, Rows & Thinking in Data
      • Day 2 — Relationships & Foreign Keys (Thinking in Connections)
      • Day 3 — Filtering, Aggregation & Answering Data Questions
      • Day 4 — JOINs (Combining Tables the Right Way)
      • Day 5 — Subqueries, EXISTS & NOT EXISTS (Thinking in Layers)
      • Day 6 — Indexes, Constraints & How Databases Think
      • Day 7 — Full SQL Interview Simulation (SDE-1 Ready)
      • Extended Day 1 — Core Business Systems (Deep Practice)
      • Extended Day 2 — Booking & Platform Systems (High-Depth Practice)
      • Extended Day 3 — Content & Learning Platforms (Capstone Practice)
    • icon picker
      LLD: Java
      • DAY 1 — Core Foundations (SDE-2 Level)
      • DAY 2 — State, Time & Domain Correctness
      • DAY 3 — Extensibility & Failure Handling (SDE-2 Core Signal)
      • DAY 4 — Concurrency, Scheduling & Consistency (SDE-2 Critical)
      • DAY 5 — Workflow Design & Config-Driven Systems (SDE-2+)
      • DAY 6 — Eventing & Usage-Based Systems (Advanced SDE-2)
      • DAY 7 — Interview Simulation (Hard, Production-Grade)
      • Hidden Edge Cases Interviewers Expect (Day-wise)
      • Detailed Testing file:
    • Assignment:
      • If else Practice Set
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LLD: Java
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