#Backend Interview

Backend Concepts you must know before any Interview Add more if you know Follow @missgandhi.tech for more [ engineering , technology , backend , system design , interviews , interview preparation , questions , frontend , software developer ] #engineering #engineer #technology #coding #programming #interviews #systemdesign #backend #frontend #jobinterview #jobpreparation #softwaredeveloper

💯 A Most asked questions❓for Backend Developers. How to optimise your API? Interview ready answer. 1- Asynchronous programming 2- Database query optimization 3-implement caching 4-dependency injection That's it to crack this question. #api #backenddeveloper #java #softwaredeveloper #coding #fast #database #interview #interviewprep

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Interviews aren’t about pretending to be someone else. They’re about telling your story in a way that highlights your value! Same truth. Better framing. 1. What’s your biggest weakness? Don’t confess something that disqualifies you. Pick a real but safe weakness, and show growth. You can say something like: “I tend to overanalyze my work because I want it to be perfect. But I’ve started setting time blocks and clear checkpoints so I stay efficient without compromising quality.” 2. Why did you leave your last job? Never turn this into a complaint session. Even if the environment wasn’t ideal, keep it professional and future-focused. You could say: “I learned a lot in my previous role, but I’m now looking for an environment where I can take on more ownership and expand my impact.” 3. Where do you see yourself in 5 years? They’re not asking for your life plan. They just want to know if you’re ambitious and aligned. You can say: “I see myself deepening my expertise in this domain and gradually stepping into mentorship or leadership responsibilities as I grow.” 4. Why is there a gap in your resume? Don’t frame it as failure or helplessness. Instead, show intention and growth. Gaps don’t scare employers, stagnation does. You can say: “I took that time to upskill, work on personal projects, and reassess what kind of role I truly wanted. It gave me clarity and strengthened my skill set.” 5. What do you do outside of work? Don’t say, “I just work.” That’s not impressive, but concerning. Share something real, and connect it back. For example: “I enjoy creating content about corporate life. It’s helped me improve communication, storytelling, and consistency.” If you’re in tech and navigating interviews right now, save this 💫 💭 Comment “INTERVIEW” and I’II DM you a 30 interview questions list with sample answers I prepared. #corporate #careertips #interviewprep #interviews #guidance

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Below are the Backend system design concepts that we should know💯👇 Comment ‘link’ to get this list. Learning these backend concepts will help you guys to understand the system designs easily. Core Concepts 1. What is an API 2. REST vs GraphQL 3. HTTP methods (GET, POST etc) 4. HTTP status codes (2xx, 4xx etc) 5. Stateless vs Stateful APIs 6. Authentication vs Authorization 7. Session-based auth vs JWT 8. OAuth 2.0 9. Rate limiting vs Throttling 10. Idempotency (especially for payments) ⸻ Databases & Data Handling 11. SQL vs NoSQL — when to use what 12. Indexes and how they speed up queries 13. ACID properties 14. Transactions & isolation levels 15. Database normalization vs denormalization 16. Pagination (offset vs cursor-based) 17. Sharding & partitioning 18. Read replicas & write scaling 19. Handling duplicate records 20. Optimistic vs pessimistic locking ⸻ Caching & Performance 21. What is caching and where to cache 22. Cache eviction strategies (TTL, LRU) 23. Cache consistency & stale cache problems 24. CDN and edge caching 25. Why cache can make systems wrong ⸻ Distributed Systems & Scaling 26. Load balancing (round-robin, least connections, hashing) 27. Horizontal vs vertical scaling 28. Microservices vs monoliths (trade-offs) 29. Service-to-service communication (sync vs async) 30. Message queues (Kafka, RabbitMQ, SQS) ⸻ Reliability & Real-World Problems 31. Exactly-once vs at-least-once processing 32. Retries, timeouts, and circuit breakers 33. Handling race conditions 34. Distributed locking 35. Event-driven architecture 36. Saga pattern (distributed transactions) 37. Graceful degradation 38. Observability (logs, metrics, tracing) 39. Deployments (blue-green, rolling) 40. Handling traffic spikes & viral load #SystemDesign #tech #backenddeveloper #interview #dailypost (backend interview preparation, system design concepts, software engineering interviews, Roadmap, interviews, career, growth)

Backend concepts you should know 👇🏻 Comment "link" to get this document in Dm Core Concepts 1. What is an API 2. REST vs GraphQL 3. HTTP methods (GET, POST, PUT etc) 4. HTTP status codes (2xx, 4xx, 5xx) 5. Stateless vs Stateful APIs 6. Authentication vs Authorization 7. Session-based auth vs JWT 8. OAuth 2.0 (Login with Google, GitHub, etc.) 9. Rate limiting vs Throttling 10. Idempotency (especially for payments) ⸻ Databases & Data Handling 11. SQL vs NoSQL — when to use what 12. Indexes and how they speed up queries 13. ACID properties 14. Transactions & isolation levels 15. Database normalization vs denormalization 16. Pagination (offset vs cursor-based) 17. Sharding & partitioning 18. Read replicas & write scaling 19. Handling duplicate records 20. Optimistic vs pessimistic locking ⸻ Caching & Performance 21. What is caching and where to cache 22. Cache eviction strategies (TTL, LRU) 23. Cache consistency & stale cache problems 24. CDN and edge caching 25. Why cache can make systems wrong ⸻ Distributed Systems & Scaling 26. Load balancing (round-robin, least connections, hashing) 27. Horizontal vs vertical scaling 28. Microservices vs monoliths (trade-offs) 29. Service-to-service communication (sync vs async) 30. Message queues (Kafka, RabbitMQ, SQS) ⸻ Reliability & Real-World Problems 31. Exactly-once vs at-least-once processing 32. Retries, timeouts, and circuit breakers 33. Handling race conditions 34. Distributed locking 35. Event-driven architecture 36. Saga pattern (distributed transactions) 37. Graceful degradation 38. Observability (logs, metrics, tracing) 39. Deployments (blue-green, rolling) 40. Handling traffic spikes & viral load #BackendEngineering #SystemDesign #softwareengineering #softwareengineer #techcareers (backend interview preparation, system design concepts, API basics, backend engineering roadmap, software engineering interviews)

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1️⃣ MOCK INTERVIEW WITH THE COMPANY - Most people do not even know this is possible. What if I told you, you could literally do practice interviews with the company you’re about to interview with. - I have gotten practice interviews from Google, McKinsey, Microsoft and more…the key is leveraging alumni. - Filter on LinkedIn: Your School or Current Company + Location + Company (you’re interviewing at) + Role (you’re interviewing for). Then reach out over LinkedIn or Email. - My template: “Hi X! My name is Sean, I am a [student at X school] OR [currently at X company]. I have a first round at [insert company] for [insert role]. If you have capacity, I’d love to chat about your experience in the role and any interview tips.” —> convert this to a mock, school alum are especially willing to help. 2️⃣ COPY ANSWERS THAT WORK - I mean this quite literally. Copy the structure, the narratives, the storytelling style that already works for the industry + role you’re interviewing for, don’t try to reinvent the wheel. - Do this by watching YouTube videos on channels like Exponent and Rocketblocks. Then, copy the structure (not exact words). - Next level hack: do mock interviews with people who have landed the job before. Then ask them what worked for them then COPY it. - Even more next level: put all of your preparation into ChatGPT then ask it to help you practice. Since the information you give it is based on what already works, you get to practice with a “winning playbook”. 3️⃣ JOIN SECRET COMMUNITIES - Leverage secret communities on Slack and Discord for interview prep. Hear about what jobs are hiring, exchange interview information and schedule interview prep sessions. - IYKYK: some communities I have used are Lewis Lin Slack Channel, Product Haven, and Tech Interview Prep Discord. - These communities are honestly such a cheat code and so so helpful in prepping for interviews. If this was helpful, like and follow for more career tips and also see what’s beyond the 9 to 5! #interviewprep #interviewtips #interviewadvice #productmanagement #managementconsulting

This is a very common real-world backend interview question. API works in Postman but not in the browser — why? 1️⃣ CORS restriction Browsers enforce cross-origin rules. Postman does not. 2️⃣ Missing headers Auth tokens, cookies, or custom headers may not be sent automatically by the browser. 3️⃣ Different HTTP methods Browser may send preflight OPTIONS request before the actual call. 4️⃣ Session / cookie issues Cookies might be blocked, expired, or not allowed across domains. 5️⃣ HTTPS / security policies Mixed content or certificate problems can stop browser requests. ⸻ 🎯 Interview takeaway If it works in Postman but fails in browser → suspect CORS, headers, or cookies. Browser has rules. Postman doesn’t. { BackendEngineering, RESTAPI, Debugging, Security, SystemDesign, InterviewPrep } #BackendEngineering #RESTAPI #Debugging #SystemDesign #TechExplained

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