Core CS and placement prep

• Operating SystemsPractice

  0/18 lessons

  1. Processes and threads55 min
  2. CPU scheduling50 min
  3. Synchronization and deadlocks50 min
  4. Memory management and paging55 min
  5. File systems and I/O55 min
  6. Module assignment: OS lab simulator50 min
  7. System calls, interrupts and kernel mode40 min
  8. Fork, exec and wait45 min
  9. Pipes, sockets and shared memory45 min
  10. Signals and how a process handles them45 min
  11. Thread models: user, kernel and hybrid40 min
  12. Condition variables and monitors45 min
  13. Classic problems: dining philosophers and readers-writers45 min
  14. Spinlocks, atomic operations and memory ordering45 min
  15. Demand paging and copy-on-write40 min
  16. Thrashing and the working set model45 min
  17. Multi-level page tables and the TLB45 min
  18. Heap allocation, fragmentation and the buddy system45 min

  Module quiz

• DBMSPractice

  0/18 lessons

  1. The ER model and keys45 min
  2. Normalization50 min
  3. Transactions and ACID50 min
  4. Indexing and concurrency control50 min
  5. SQL interview questions55 min
  6. Module assignment: a bookshop database55 min
  7. Relational algebra: select, project and join45 min
  8. Functional dependencies and attribute closure50 min
  9. Lossless joins and dependency preservation45 min
  10. Two-phase locking and deadlocks50 min
  11. Write-ahead logging and crash recovery50 min
  12. Join algorithms: nested loop, hash and sort-merge50 min
  13. Views and materialized views35 min
  14. Stored procedures and triggers40 min
  15. Database engines compared: document, key-value, column and graph45 min
  16. Two-phase commit and distributed transactions50 min
  17. SQL injection and parameterised queries35 min
  18. Connection pooling and the N+1 query problem45 min

  Module quiz

• Computer NetworksPractice

  0/16 lessons

  1. Network layers and addressing45 min
  2. TCP and UDP50 min
  3. HTTP, HTTPS and DNS50 min
  4. Routing and sockets50 min
  5. Module assignment: network toolkit50 min
  6. Ethernet frames, MAC addresses and ARP40 min
  7. IPv6 addresses and prefixes40 min
  8. ICMP, ping and traceroute40 min
  9. NAT and DHCP45 min
  10. TLS handshake and certificates40 min
  11. QUIC and HTTP/340 min
  12. HTTP caching and cookies45 min
  13. WebSockets and server-sent events45 min
  14. Email protocols: SMTP, IMAP and POP345 min
  15. Network troubleshooting with dig, curl, ss and tcpdump45 min
  16. CDNs and anycast45 min

  Module quiz

• OOP Interview QuestionsPractice

  0/14 lessons

  1. The four pillars of OOP45 min
  2. SOLID principles50 min
  3. Design patterns, an introduction50 min
  4. Common OOP interview questions50 min
  5. Module assignment: Vehicle rental desk55 min
  6. Classes, constructors and object lifetime45 min
  7. Abstract classes vs interfaces45 min
  8. Overloading vs overriding35 min
  9. Composition over inheritance40 min
  10. Immutability and access modifiers45 min
  11. RAII and memory in C++50 min
  12. Builder and Adapter patterns45 min
  13. Exceptions: checked, unchecked and when to throw45 min
  14. equals, hashCode and Comparable45 min

  Module quiz

• Resume and PortfolioPractice

  0/11 lessons

  1. Resume structure for freshers45 min
  2. Writing strong resume bullets50 min
  3. Projects and your GitHub profile55 min
  4. LinkedIn and your online presence50 min
  5. Module assignment: resume and portfolio kit55 min
  6. ATS-friendly formatting and keywords40 min
  7. Skills section and certifications40 min
  8. Education, CGPA and coursework35 min
  9. Tailoring a resume to a job description45 min
  10. Cover letters and referral messages35 min
  11. Internships and fresher experience entries35 min

  Module quiz

• Interview PreparationPractice

  0/17 lessons

  1. DSA interview strategy50 min
  2. Behavioural interview answers50 min
  3. Mock interviews and the hiring process50 min
  4. Offers and negotiation50 min
  5. Mock question bank50 min
  6. A four-week preparation plan45 min
  7. Module assignment: Interview toolkit55 min
  8. Clarifying questions before you code40 min
  9. Graph and tree problems in interviews50 min
  10. Recognising dynamic programming45 min
  11. Explaining your solution while you code40 min
  12. Debugging under interview pressure40 min
  13. Take-home assignments and project discussions50 min
  14. Remote interview setup40 min
  15. Asking good questions at the end35 min
  16. Follow-up emails and handling rejection40 min
  17. Reviewing a recorded mock interview40 min

  Module quiz

• System Design IntroPractice

  0/16 lessons

  1. Requirements and back-of-the-envelope estimation46 min
  2. Load balancers and caching46 min
  3. Databases at scale and message queues47 min
  4. Design a URL shortener48 min
  5. Design a chat application48 min
  6. Module assignment: plan a photo-sharing service50 min
  7. Design a rate limiter50 min
  8. Design a news feed50 min
  9. Design a notification service50 min
  10. Design a key-value store50 min
  11. Design a web crawler45 min
  12. Consistent hashing40 min
  13. Leader election, failover and split brain45 min
  14. API design: pagination, idempotency and versioning50 min
  15. Design an online ticket booking system45 min
  16. Design a video streaming service50 min

  Module quiz

• Low-Level DesignPractice

  0/10 lessons

  1. How to run a low-level design interview40 min
  2. Design a parking lot55 min
  3. Design a vending machine with the State pattern40 min
  4. Design an elevator system45 min
  5. Design a library management system50 min
  6. Design a splitwise-style expense sharer55 min
  7. Design a text editor with undo using Command42 min
  8. Design a chess game50 min
  9. Design a file system with Composite45 min
  10. Design an in-memory pub-sub system50 min

• HR Round PrepPractice

  0/5 lessons

  1. Tell me about yourself30 min
  2. Why this company and why this role35 min
  3. Weaknesses and resume gaps40 min
  4. Relocation, shifts and bond questions40 min
  5. Background checks and document checklist35 min

• Mock Interview SetsPractice

  0/6 lessons

  1. Timed mock: OS and concurrency round45 min
  2. Timed mock: DBMS and SQL round40 min
  3. Timed mock: networking round30 min
  4. Timed mock: OOP and low-level design round45 min
  5. Timed mock: HR round40 min
  6. Full loop simulation for one day45 min

• Freelancing and Remote WorkPractice

  0/12 lessons

  1. What Freelancing Involves35 min
  2. Choosing a Niche to Sell40 min
  3. Client Case Studies35 min
  4. Freelancing Platforms Compared40 min
  5. Finding Clients Beyond Platforms40 min
  6. Writing a Proposal That Wins45 min
  7. Pricing: Hourly, Fixed and Value45 min
  8. Scope and Change Requests45 min
  9. Contracts and Statements of Work45 min
  10. Invoices, Taxes and Getting Paid45 min
  11. Remote Work and Async Communication40 min
  12. Module Assignment: Proposal and Contract55 min

• System Design in DepthPractice

  0/16 lessons

  1. Capacity estimation drills40 min
  2. Load balancer algorithms and health checks40 min
  3. Cache write strategies40 min
  4. Cache invalidation, TTLs and stampedes45 min
  5. Sharding strategies and hot keys45 min
  6. Replication: leaders, followers and lag45 min
  7. CAP theorem and PACELC with real trade-offs45 min
  8. Quorums and consistency models50 min
  9. Queue delivery guarantees and idempotent consumers45 min
  10. Backpressure, retries and dead-letter queues45 min
  11. Rate limiter algorithms compared45 min
  12. Design a URL shortener at scale50 min
  13. Design a chat system45 min
  14. Design a news feed40 min
  15. Search and log pipelines40 min
  16. Design review checklist45 min

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