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Engineering Knowledge Base

PrepareforTechInterviews

A practical, structured reference for Java backend engineers. Covering interview preparation, DSA training, engineering books, and cloud certification — all in one place.

13+
Learning Paths
20
DSA Weeks
8
Engineering Books
15+
AWS Topics
500+
Pages of Content

Learning Paths

Choose your domain. Each path builds from fundamentals to senior-level topics with practical examples, interview questions, and real-world context.

Interview Preparation Roadmap

A three-phase curriculum for engineers targeting backend, system design, and Java/Spring interviews.

Explain choices with at least one alternative
📈 Describe what breaks first at 10× traffic
🔧 Connect concept → trade-off → operations
🚨 Avoid definition-only answers
View Full Interview Roadmap →

Keep Your Engineering Skills Sharp

Consistency is key to mastering technical interviews. Solve today's curated LeetCode problem, or test your conceptual knowledge of Java and Spring Boot.

🔀 Random Challenge

🎯 Topic Explorer

20-Week DSA Coding Roadmap

A structured algorithm curriculum from arrays to graph theory and dynamic programming. Each week targets one core pattern with progressive difficulty.

🚀 Study Intensity Level:

🎯 20-Week DSA Progress Tracker

Tracking progress for the active NeetCode 150 list

0 / 150 Solved (0%)
🟢 Easy:0 / 40
🟡 Medium:0 / 92
🔴 Hard:0 / 18
Week 1: Arrays & StringsLesson Doc 📖
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SolvedProblemDiffTarget Companies
Two Sum#1🔗Easy
Longest Common Prefix#14🔗Easy
Find the Index of the First Occurrence in a String#28🔗Easy
Group Anagrams#49🔗Medium
Maximum Subarray#53🔗Medium
Length of Last Word#58🔗Easy
Rotate Array#189🔗Medium
Contains Duplicate#217🔗Easy
Product of Array Except Self#238🔗Medium
Valid Anagram#242🔗Easy
Subarray Sum Equals K#560🔗Medium
Find Pivot Index#724🔗Easy
Running Sum of 1d Array#1480🔗Easy
Build Array from Permutation#1920🔗Easy
Concatenation of Array#1929🔗Easy
Week 2: Two Pointers & WindowLesson Doc 📖
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Week 3: Linked ListsLesson Doc 📖
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Week 4: Hash Tables & SetsLesson Doc 📖
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Week 5: Stacks & QueuesLesson Doc 📖
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Week 6: Binary TreesLesson Doc 📖
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Week 7: Graph FoundationsLesson Doc 📖
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Week 8: Advanced GraphsLesson Doc 📖
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Week 9: Binary SearchLesson Doc 📖
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Week 10: Recursion & BacktrackingLesson Doc 📖
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Week 11: Intervals & Sweep LineLesson Doc 📖
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Week 12: Heaps & GreedyLesson Doc 📖
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Week 13: Dynamic Programming 1DLesson Doc 📖
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Week 14: Dynamic Programming 2DLesson Doc 📖
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Week 15: Advanced Sliding WindowsLesson Doc 📖
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Week 16: TriesLesson Doc 📖
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Week 17: Shortest Paths & MSTLesson Doc 📖
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Week 18: Disjoint Set UnionLesson Doc 📖
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Week 19: Bit Manipulation & MathLesson Doc 📖
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Week 20: Comprehensive ReviewLesson Doc 📖
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🗺️ 20-Week Lesson Navigation Blueprint

Week 1Arrays & Prefix SumsRunning totals, subarray sumsWeek 2Two Pointers & Sliding WindowContainer with water, substringsWeek 3Linked Lists & PointersReversal, cycle detection, mergeWeek 4Hash Tables & SetsFrequency counting, anagram, groupingWeek 5Stacks, Queues & MonotonicParentheses, next greater elementWeek 6Binary Trees & BSTDFS/BFS, LCA, BST operationsWeek 7Graph FoundationsBFS, DFS, adjacency listWeek 8Advanced GraphsTopological sort, DijkstraWeek 9Binary SearchSearch space reduction, rotated arraysWeek 10Recursion & BacktrackingPermutations, N-Queens, subsetsWeek 11Intervals & Sweep LineMerge intervals, meeting roomsWeek 12Heaps & GreedyK-largest, task schedulingWeek 13Dynamic Programming 1DFibonacci, house robber, DP stringsWeek 14Dynamic Programming 2DGrid DP, edit distance, LCSWeek 15Advanced Sliding WindowVariable windows, multi-conditionWeek 16Tries & Prefix TreesAutocomplete, word searchWeek 17Shortest Paths & MSTDijkstra, Bellman-Ford, Prim, KruskalWeek 18Disjoint Set UnionUnion-find, Kruskal, connectivityWeek 19Bit Manipulation & MathXOR tricks, prime sieveWeek 20Comprehensive ReviewMock interviews, system + coding
View Full DSA Curriculum →

Engineering Books

Distilled notes and key takeaways from the most impactful engineering books — organized by track.

💡 Recommended reading order — Software Craft: Clean Code → Clean Architecture → Effective Java  | Deep Dive: DDIA → Building Microservices → OCP Java SE 21

Cloud Certifications — AWS DVA-C02

Targeted preparation for the AWS Certified Developer – Associate (DVA-C02) exam with exam tips, traps, and scenario-based practice questions on every topic page.

Development with AWS Services32%
Security26%
Deployment24%
Troubleshooting & Optimization18%
Topic 01DVA-C02 RoadmapFull exam roadmap and study strategyTopic 02LambdaInvocation, cold start, layers, destinationsTopic 03DynamoDBKeys, GSI/LSI, streams, DAX, single-tableTopic 04API GatewayREST vs HTTP API, authorizers, throttlingTopic 05S3Storage classes, lifecycle, encryptionTopic 06IAM & CognitoRoles, policies, STS, user/identity poolsTopic 07SQS, SNS & EventBridgeMessaging patterns, fan-out, FIFO, KinesisTopic 08CloudFormation & SAMIaC, stack management, SAM for serverlessTopic 09RDS & ElastiCacheMulti-AZ, read replicas, Redis vs MemcachedTopic 10ECS, ECR & FargateContainer orchestration, task roles, IAMTopic 11CI/CD (CodePipeline)Pipelines, buildspec, deploy actionsTopic 12CloudWatch & X-RayMetrics, alarms, distributed tracing, logsTopic 13KMS & Secrets ManagerEnvelope encryption, rotation, SSMTopic 14Step FunctionsStandard vs Express, Map state, callbacksTopic 15Exam Tips & Mock ExamLast-minute facts, 50 practice questions

⚠️ High-priority exam topics — Lambda (invocation types, cold start, versioning) · DynamoDB (single-table design, GSI/LSI, DAX) · SQS (visibility timeout, DLQ, FIFO) · IAM (policy evaluation, role assumption) · CloudFormation (change sets, rollback triggers, cross-stack refs)

View Full AWS Study Path →

Ready to level up?

Pick a path and start building depth. Every page connects concepts to real engineering decisions, interview scenarios, and production systems.