sam

[Vishwas R @VishwasR_]

@thecodemarathon @WhatsApp @kunalb11 This is super common. Blocking nos is useless as they keep switching. There’s a better way - document spam & push for compensation via RBI Ombudsman. I got ₹15,000 from Bajaj Finance + ₹5,000 from Kotak for their spam calls by following proper process.
https://t.co/BfdmsvJsmA

[I-WE-U Global PVT LTD @iweuglobal]

Dial 112 and get an entry done there that your FIR is not getting registered,
Approach SP office immediately regarding the FIR with the name of Police officer,
Simultaneously Get a lawyer to district court and file your complaint for Requesting to convert it into FIR.
The CJM will ask whether you visited SP office they will see that application as well
Will send an inquiry about case and will order FIR.

After this also if FIR is not registered
Go to High Court file a criminal writ against all including the CJM of district court and the FIR will be registered.

I know this is a huge struggle.
But accept it this is our system and i just gave you a free legal advice. To win. Cuz i feel for you man.

[sam @shanki2210]

@CricManjit @ishankishan51 9

[Ashish Pratap Singh @ashishps_1]

If you want to get good at coding interviews, consider learning these topics:

𝐃𝐚𝐭𝐚 𝐒𝐭𝐫𝐮𝐜𝐭𝐮𝐫𝐞𝐬: Arrays, Strings, Linked Lists, Stacks, Queues, Hash Tables, Matrix, Trees, Binary Search Trees, Heaps, Graphs, Trie, Union Find

𝐀𝐥𝐠𝐨𝐫𝐢𝐭𝐡𝐦𝐬: Sorting (Merge Sort, Quick Sort, Heap Sort, Counting Sort, Bucket Sort), Binary Search, Kadane’s Algorithm, Tree Traversal (in-order, pre-order, post-order, level-order), Graph Algorithms (DFS, BFS, Topological Sort, Minimum Spanning Tree, Dijkstra, Bellman Ford)

𝐏𝐫𝐨𝐛𝐥𝐞𝐦-𝐒𝐨𝐥𝐯𝐢𝐧𝐠 𝐓𝐞𝐜𝐡𝐧𝐢𝐪𝐮𝐞𝐬: Two Pointers, Sliding Window, Prefix Sum, Monotonic Stack, Top ‘K’ Elements, Fast and Slow Pointers, Bit Manipulation, Divide and Conquer, Recursion, Backtracking, Greedy, Dynamic Programming

[SumitM @SumitM_X]

As a Java developer,

Please learn:

1. Core Java Mastery
- OOP principles (SOLID, DRY, KISS)
- Generics, Lambda expressions, Functional interfaces
- Java Streams API (map/reduce, collectors)
- Java Collections framework
- Java Reflection API
- Exception handling

2. Multithreading & Concurrency
- Thread synchronization, Executors, Locks
- Fork/Join framework
- Understanding of race conditions, deadlocks, and thread pools
- Concurrency utilities (java.util.concurrent)

3. Design Patterns & Architecture
- Common design patterns (Singleton, Factory, Builder)
- Architectural patterns (MVC, - Microservices, Event-Driven Architecture)
- Dependency Injection (DI), Inversion of Control (IoC)

4. Java Memory Management
- Garbage Collection (G1, CMS, ZGC)
- JVM heap and stack management
- Profiling tools (JProfiler, VisualVM)
- Analyzing memory leaks, thread dumps, and heap dumps

5. Classloaders and Reflection
- Custom class loaders
- Dynamic class loading
- Reflection for runtime behavior manipulation

6. Spring Framework & Spring Boot
- Spring Core (Dependency Injection, AOP)
- Spring Boot (Auto-configuration, Microservices support)
- Spring Security (OAuth2, JWT)
- Spring Data (JPA, Hibernate integration)
- Spring Cloud (Netflix OSS, Circuit Breakers)

7. Microservices Architecture
- Service discovery (Eureka, Consul)
- Load balancing, distributed tracing, and circuit breaking
- API Gateway (Zuul, NGINX)
- Asynchronous communication with Kafka, RabbitMQ

8. RESTful Web Services
- REST principles, building APIs
- JSON/XML handling
- API versioning, OpenAPI/Swagger documentation

9. Java I/O and NIO
- Blocking vs non-blocking I/O (NIO)
- Asynchronous I/O, channels, selectors
- File handling, serialization and deserialization

10. Reactive Programming
- Project Reactor, RxJava
- Event-driven architecture, backpressure
- Reactive streams, non-blocking IO

11. JPA/Hibernate
- ORM principles, entity relationships
- Lazy vs eager loading
- Caching strategies, query optimization

12. Database Optimization
- SQL optimization, indexing, and transactions
- NoSQL databases (MongoDB, Cassandra)
- ACID principles, CAP theorem

13. Distributed Systems
- Consistency, availability, partitioning (CAP)
- Event sourcing, CQRS (Command Query Responsibility Segregation)
- Distributed caching (Redis, Hazelcast)
- Tools: Apache ZooKeeper, Consul, etcd

14. Testing & TDD/BDD
- Unit testing (JUnit, Mockito)
- Integration and functional testing
- Behavior-driven development (Cucumber)

15. CI/CD & DevOps
- Continuous integration (Jenkins, CircleCI)
- Containerization with Docker
- Orchestration with Kubernetes
- Source control (Git), versioning, branching strategies

16. Performance Tuning & Optimization
- JVM tuning, garbage collection optimization
- Caching strategies, load balancing
-Tools for profiling and monitoring (Prometheus, Grafana)

17. Security
- Authentication/authorization (OAuth2, JWT)
- Secure coding (OWASP guidelines)
- Encryption (TLS/SSL), CSRF/XSS prevention

18. Cloud Platforms & API Gateways
- AWS, Azure, GCP deployment
-API Gateway (Zuul, NGINX) for rate-limiting and routing
- Cloud-native microservices tools

19. Logging & Monitoring
- Centralized logging (ELK Stack, Graylog)
- Distributed tracing (Jaeger, Zipkin)
- Application Performance Monitoring (APM)

20. Caching Mechanisms
- In-memory caching (Ehcache, Caffeine)
- Distributed caching (Redis, Memcached)
- Cache invalidation strategies (LRU, LFU)

21. Build Tools
- Maven and Gradle for dependency management
- Multi-module project handling
- Continuous delivery pipelines

22. Message Queuing Systems
- Kafka, RabbitMQ for event-driven microservices
- Pub/Sub models, distributed message brokers

[SumitM @SumitM_X]

As a Java developer,

Please learn:

1. Core Java Mastery
- OOP principles (SOLID, DRY, KISS)
- Generics, Lambda expressions, Functional interfaces
- Java Streams API (map/reduce, collectors)
- Java Collections framework
- Java Reflection API
- Exception handling

2. Multithreading & Concurrency
- Thread synchronization, Executors, Locks
- Fork/Join framework
- Understanding of race conditions, deadlocks, and thread pools
- Concurrency utilities (java.util.concurrent)

3. Design Patterns & Architecture
- Common design patterns (Singleton, Factory, Builder)
- Architectural patterns (MVC, - Microservices, Event-Driven Architecture)
- Dependency Injection (DI), Inversion of Control (IoC)

4. Java Memory Management
- Garbage Collection (G1, CMS, ZGC)
- JVM heap and stack management
- Profiling tools (JProfiler, VisualVM)
- Analyzing memory leaks, thread dumps, and heap dumps

5. Classloaders and Reflection
- Custom class loaders
- Dynamic class loading
- Reflection for runtime behavior manipulation

6. Spring Framework & Spring Boot
- Spring Core (Dependency Injection, AOP)
- Spring Boot (Auto-configuration, Microservices support)
- Spring Security (OAuth2, JWT)
- Spring Data (JPA, Hibernate integration)
- Spring Cloud (Netflix OSS, Circuit Breakers)

7. Microservices Architecture
- Service discovery (Eureka, Consul)
- Load balancing, distributed tracing, and circuit breaking
- API Gateway (Zuul, NGINX)
- Asynchronous communication with Kafka, RabbitMQ

8. RESTful Web Services
- REST principles, building APIs
- JSON/XML handling
- API versioning, OpenAPI/Swagger documentation

9. Java I/O and NIO
- Blocking vs non-blocking I/O (NIO)
- Asynchronous I/O, channels, selectors
- File handling, serialization and deserialization

10. Reactive Programming
- Project Reactor, RxJava
- Event-driven architecture, backpressure
- Reactive streams, non-blocking IO

11. JPA/Hibernate
- ORM principles, entity relationships
- Lazy vs eager loading
- Caching strategies, query optimization

12. Database Optimization
- SQL optimization, indexing, and transactions
- NoSQL databases (MongoDB, Cassandra)
- ACID principles, CAP theorem

13. Distributed Systems
- Consistency, availability, partitioning (CAP)
- Event sourcing, CQRS (Command Query Responsibility Segregation)
- Distributed caching (Redis, Hazelcast)
- Tools: Apache ZooKeeper, Consul, etcd

14. Testing & TDD/BDD
- Unit testing (JUnit, Mockito)
- Integration and functional testing
- Behavior-driven development (Cucumber)

15. CI/CD & DevOps
- Continuous integration (Jenkins, CircleCI)
- Containerization with Docker
- Orchestration with Kubernetes
- Source control (Git), versioning, branching strategies

16. Performance Tuning & Optimization
- JVM tuning, garbage collection optimization
- Caching strategies, load balancing
-Tools for profiling and monitoring (Prometheus, Grafana)

17. Security
- Authentication/authorization (OAuth2, JWT)
- Secure coding (OWASP guidelines)
- Encryption (TLS/SSL), CSRF/XSS prevention

18. Cloud Platforms & API Gateways
- AWS, Azure, GCP deployment
-API Gateway (Zuul, NGINX) for rate-limiting and routing
- Cloud-native microservices tools

19. Logging & Monitoring
- Centralized logging (ELK Stack, Graylog)
- Distributed tracing (Jaeger, Zipkin)
- Application Performance Monitoring (APM)

20. Caching Mechanisms
- In-memory caching (Ehcache, Caffeine)
- Distributed caching (Redis, Memcached)
- Cache invalidation strategies (LRU, LFU)

21. Build Tools
- Maven and Gradle for dependency management
- Multi-module project handling
- Continuous delivery pipelines

22. Message Queuing Systems
- Kafka, RabbitMQ for event-driven microservices
- Pub/Sub models, distributed message brokers

[Vivo @vivoplt]

Backend Development Project Ideas

• Authentication API
• CRUD API For Users
• Blog Backend
• URL Shortener
• Pagination and Search API
• File Upload API
• Rate Limiter API
• Muti User chat Application
• Multi role user System
• O Auth2 Login API
• Job Queue System
• Recommendation System
• Video Steaming Service
• High Performance API With Caching
• Distributed File Storage System

[Abhishek Singh @0xlelouch_]

I recently asked my friends who got fired from Amazon, these are the common DSA questions they ask in interviews!

1. Arrays + HashMaps (frequency, prefix sums, subarray counts)

2. Two Pointers (sorted tricks, dedupe, partition)

3. Sliding Window (longest/shortest window, k distinct, fixed window)

4. Binary Search (classic + binary search on answer)

5. Stack Patterns (monotonic stack, parentheses, next greater)

6. Heaps / Priority Queue (top-k, scheduling, k-way merge)

7. Trees (traversals, BFS levels, LCA, diameter)

8. Graphs (BFS/DFS, cycle detection, topological sort)

9. Dynamic Programming (1D/2D basics: LIS, knapsack-ish, string DP)

10. Greedy (intervals, sorting-based decisions, activity selection)

[Abhishek Singh @0xlelouch_]

Here are the system design questions that keep showing up (and what the interviewer is really probing):

1. Design a URL Shortener (but at Amazon scale)
They’ll push: hot keys, read-heavy traffic, cache strategy, storage growth, TTL, abuse prevention.

2. Design a Rate Limiter for an API Gateway
They’ll push: token bucket vs leaky bucket, per-user vs per-IP, distributed counters, Redis vs in-memory, consistency under bursts.

3. Design a Notification System (email/SMS/push)
They’ll push: retries, DLQ, idempotency keys, delivery guarantees, provider failures, fan-out at scale.

4. Design a File Upload / S3-like Object Store
They’ll push: multipart upload, checksum integrity, dedupe, metadata store, access control, lifecycle policies.

5. Design a Real-time Chat / Messaging System
They’ll push: ordering, offline delivery, read receipts, multi-device sync, websockets, storage model.

6. Design a Feed System (Twitter/Instagram-like)
They’ll push: fanout-on-write vs fanout-on-read, cache invalidation, ranking, storage, backpressure.

7. Design a Metrics / Monitoring System
They’ll push: ingestion pipeline, aggregation windows, cardinality explosions, retention, query performance.

8. Design a Distributed Logging / Tracing Platform
They’ll push: sampling, correlation IDs, storage cost, indexing strategy, high write throughput.

9. Design an E-commerce Checkout / Order System
They’ll push: idempotency, inventory reservation, payment failures, saga pattern, consistency vs availability.

10. Design a Queue / Task Processing System (SQS-lite)
They’ll push: visibility timeout, retries, at-least-once semantics, dedupe, ordering vs throughput.

---

What Amazon evaluates in every one of these

Requirements clarity (you ask good questions before drawing)

Tradeoffs (CAP, cost, latency, correctness)

Failure thinking (timeouts, retries, partial failures, backpressure)

Data model + APIs (not just components)

“How would you run this in prod?” (metrics, alerts, rollbacks, migrations)

If you can talk through those 5 dimensions calmly, you’re already ahead of most candidates.

[Akshay Shinde @ConsciousRide]

As an Engineer you should know the following concepts

Idempotency → Prevents duplicate payments
Pagination → Keeps your DB from dying
Versioning → Lets you evolve APIs without breaking clients
Rate limiting → Protects your service from abuse
Error codes → Helps clients handle failures correctly
Caching → Reduces load by 90%
JWT security → Prevents leaking sensitive data
N+1 queries → The difference between 10ms and 10s response time
Docs → Stops the `how does this API work?` Slack messages
Consistency → Choose the right tradeoff for your use case

[Nitin.nn @NitinthisSide_]

DSA give u this -

Graviton - 50LPA
Google - 20-45 LPA
Microsoft - 15-40 LPA
Amazon - 12–35 LPA
Rubrik - 50LPA
Tower -50LPA
Quadeye -50LPA
Adobe - 12-30 LPA
Uber - 15-35 LPA
Flipkart - 10-28 LPA
Goldman Sachs - 12-30 LPA
Sprinklr - 15-40 LPA
Intuit - 14-35 LPA
Apple - 18-45 LPA

[pulkit mittal @pulkit_mittal_]

Today’s HLD interviews rarely stop at scale.
Most of the popular distributed systems are eventually consistent, but strong consistency is where interviews get tricky.

Here’s a list of problems you must practice to learn this:
1. Distributed Counter
2. Leaderboard with Strong Ordering
3. Ticket Booking System
4. Inventory Reservation System
5. Distributed Cache Invalidation System
6. Quota / Rate Enforcement System
7. Locking Service
8. Configuration Rollout System

You can check my pinned post for the sources to learn these concepts.

[Swati @Heymaxi01]

As a backend engineer:Mandatory skill list:SOLID
Multithreading
Immutability
Streaming & messaging
Caching
Security (SSL, JWT, OAuth)
Factory · Decorator · Singleton · Observer
TDDIgnore at your own risk.
These separate juniors from seniors.

[Swati Ahuja @aiandchai]

I curated 400+ LeetCode problems into 90 patterns (helped me crack Salesforce, Intuit, and Microsoft)

I know LeetCode can feel overwhelming for beginners - especially when you’re close to interviews and don’t know which questions to focus on. Blind 75/95 and similar lists are a decent starting point, but let’s be honest: solving just ~100 questions usually isn’t enough to crack top interviews.

That’s why I put together a curated sheet that organizes 360 problems into 90 core patterns.
Yes, there are other pattern-based resources out there, but you won’t find this level of granularity in patterns anywhere else. Every problem in this sheet is sourced from real interviews in the last 6 months at companies like Google, Meta, Amazon, and Uber.
I originally created this sheet for myself, and it personally helped me crack interviews at Salesforce (twice), Intuit, Microsoft, and several mid-range companies over the years.

Sharing it here in case it helps someone else in their prep journey.
https://t.co/Q3j2sr4dMq

[Abhishek Singh @0xlelouch_]

Top 10 DSA problems that still dominate coding rounds:

1. Two Sum (hash map)
2. Sliding Window Max / Longest Substring (window + freq map)
3. Binary Search on answer (min capacity, koko bananas)
4. Merge Intervals (sort + scan)
5. Top K Frequent (heap / bucket)
6. LRU Cache (hash map + doubly linked list)
7. Kth smallest in BST / inorder (stack)
8. Linked List cycle + reverse (fast/slow)
9. Islands / shortest path (BFS/DFS)
10. DP classics (coin change, LIS)

Learn to code these fast, explain tradeoffs, and handle edge cases and you should be able to clear most rounds.

[Divya Porwal @divyaporwal_]

Companies that hire off-campus and pay at par with MAANG (sometimes even more):
Uber
Atlassian
Adobe
Salesforce
Intuit
LinkedIn
Airbnb
Stripe
Databricks
Snowflake
Rubrik
Confluent
Nutanix
Goldman Sachs
DE Shaw

[JVC Sreeram (Bulls Eye) @sreeramjvc]

Baggage Tag Number

6E186098

@IndiGo6E it has been more than 32 hours & my bag is yet to be traced. Kindly act asap & keep me informed. It is causing huge inconvenience.

[UEFA @UEFA]

🏆👏 @ChelseaFC are honoured at the 2025 Monaco season kick-off for becoming the first club to win all six UEFA men's club competitions.

[sam @shanki2210]

@boymiles_ @CFCCritic_ @ibzsmo3k Pipe down and talk once your team does qualify for the bare minimum.

[Purva Desai @purvadesai98]

MLA @ShelarAshish of BJP is attempting to illegally grab a Prime property on S. V. Road, Khar west.

Society’s complaints not being registered by the @MumbaiPolice

@mhadaofficial @BJP4India @BJP4Mumbai @CMOMaharashtra @PMOIndia @mid_day @NDTVMarathi @Mumbaikhabar9 @ABPNews