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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
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Behavioral Interview Prep

Ace the round that most engineers ignore. Master the STAR method, build your story bank, and walk into any behavioral interview with confidence.

🎯Overview & StrategyThe STAR method, 8 core themes, how companies evaluate you, and a full prep checklist.Start hereSTAR Method Deep DiveDetailed templates, before/after examples, timing guides, and power word lists.Framework📚Story Bank BuilderHow to mine your experience for 10–13 strong stories and map them to any question.Preparation💬Top 50 Questions & AnswersThe 50 most-asked behavioral questions with full STAR answers across all 8 themes.Essential🏢Amazon LP GuideAll 16 Leadership Principles with example questions, story strategies, and priority tiers.FAANG⚔️Conflict & Failure StoriesTactical guide for the hardest questions — full sample answers with golden rules.AdvancedQuestions to Ask34 thoughtful questions to ask interviewers, by type — including red-flag detectors.Pro tip
🎤 50 questions with full STAR answers
🏢 All 16 Amazon Leadership Principles covered
📖 10 story types to build your bank
Scoring rubric used by real interviewers
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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.

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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.

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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
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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.