One HLD concept. 60 seconds. Interview ready
Master System Design in 60-second interview-ready shorts
Learn High-Level Design (HLD) and System Design through 60-second, interview-focused shorts. Each lesson breaks down one important concept—from scalability, caching, databases, Kafka, distributed systems, consistency, load balancing, APIs, and microservices to real-world architecture patterns. Designed for software engineers preparing for FAANG and top product-company system design interviews. Learn one concept at a time, build strong HLD fundamentals, and become confident in explaining scalable systems.
🧭 44
modules
📚 94
chapters
🎬 220
ready to watch
⏳ 149
coming soon
- 1
Module 1#001–#010
System Design Interview Foundations
3 ch · 10/10 readyCh 1Understanding HLD Interviews3/3
Ch 2Requirements4/4
- 2
Module 2#011–#017
Traffic Management & Edge Architecture
2 ch · 7/7 readyCh 4Load Balancing3/3
- 3
Module 3#018–#025
Database Fundamentals
2 ch · 8/8 readyCh 6SQL & NoSQL5/5
- 4
Module 4#026–#031
Distributed System Fundamentals
2 ch · 6/6 readyCh 8CAP & Consistency3/3
- 5
Module 5#032–#037
Distributed Caching
2 ch · 6/6 readyCh 10Cache Architecture3/3
- 6
Module 6#038–#043
API & Service Architecture
3 ch · 6/6 readyCh 12Rate Limiting2/2
Ch 13API Gateway2/2
- 7
Module 7#044–#050
DNS & Networking
3 ch · 7/7 readyCh 15DNS2/2
Ch 16TCP & TLS3/3
- 8
Module 8#051–#053
API Design & Database Performance
2 ch · 3/3 readyCh 18API Performance1/1
Ch 19Database Query Optimization2/2
- 9
Module 9#054–#058
Database High Availability
3 ch · 5/5 readyCh 20Database Scaling1/1
Ch 21Replication2/2
- 10
Module 10#059–#065
Transactions & Concurrency
3 ch · 7/7 readyCh 23Transactions2/2
Ch 24Locking1/1
- 11
Module 11#066–#067
Messaging Fundamentals
1 ch · 2/2 ready - 12
Module 12#068–#075
Apache Kafka Fundamentals
3 ch · 8/8 readyCh 27Kafka Architecture2/2
Ch 28Delivery Semantics3/3
- 13
Module 13#076–#082
Kafka Ordering & Cluster Architecture
3 ch · 7/7 readyCh 30Ordering1/1
Ch 31Offsets3/3
- 14
Module 14#083–#092
Kafka Consumer Groups
2 ch · 10/10 readyCh 33Rebalancing5/5
- #083
Kafka Consumer Group Rebalancing Explained - #084
Kafka Consumer Assignment Strategies: Range vs RoundRobin vs Sticky - #085
Kafka Consumer Liveness: Heartbeats, Sessions & Timeouts Explained - #086
Kafka Consumer Lag Monitoring: Prevent Production Issues - #087
Kafka Lag Recovery Time: How Fast Can Consumers Catch Up?
Ch 34Consumer Performance5/5
- #088
Kafka Consumer Fetch & Batching: Boosting Throughput - #089
Kafka Fetch Limits vs Poll Records: Understanding the Difference - #090
Kafka Eager vs Cooperative Rebalancing: Key Differences - #091
Kafka Static Membership: Reducing Unnecessary Rebalancing - #092
Understanding Kafka Rebalance Listeners in High-Level Design
- #083
- 15
Module 15#093–#097
Kafka Offsets & Replay
2 ch · 5/5 readyCh 35Offset Reset2/2
- 16
Module 16#098–#103
Kafka Consumer Concurrency
2 ch · 6/6 readyCh 37Parallel Processing3/3
- 17
Module 17#104–#111
Kafka Error Handling
2 ch · 8/8 readyCh 39Retry Architecture4/4
- 18
Module 18#112–#116
Advanced Kafka Consumers
2 ch · 5/5 readyCh 41Partition Assignment2/2
- 19
Module 19#117–#120
Kafka Streams
2 ch · 4/4 ready - 20
Module 20#121–#124
Distributed Coordination
2 ch · 4/4 ready - 21
Module 21#125–#135
Consensus & Raft
2 ch · 11/11 readyCh 47Consensus6/6
- #125
Understanding Consensus in Distributed Systems - #126
Understanding Raft Consensus: Terms, Elections & Log Replication - #127
Understanding Raft Log Replication: matchIndex vs commitIndex - #128
Raft Leader Failure and Re-election Process Explained - #129
FAANG HLD 🔥 | Raft Safety — Why Committed Entries Survive Leader Failure! 🛡️ - #130
Understanding Quorum and Majority in Distributed Systems
Ch 48Other Consensus Systems5/5
- #125
- 22
Module 22#136–#145
Distributed System Failure Modes
2 ch · 10/10 readyCh 49Failure Models5/5
Ch 50Time & Ordering5/5
- 23
Module 23#146–#155
Distributed System Communication
2 ch · 10/10 readyCh 51RPC5/5
Ch 52Service Communication5/5
- 24
Module 24#156–#165
Microservices Architecture
2 ch · 10/10 readyCh 53Microservices Fundamentals5/5
Ch 54Microservices Reliability5/5
- 25
Module 25#166–#175
Resilience Engineering
2 ch · 10/10 readyCh 55Failure Protection5/5
- 26
Module 26#176–#185
Observability
2 ch · 10/10 readyCh 57Observability Fundamentals5/5
- #176
Understanding Logs, Metrics, and Traces in Software Engineering - #177
Observability in Distributed Systems: Debugging Production Issues - #178
Structured Logging: Debugging Production Issues Faster - #179
Understanding Correlation IDs in Microservices Architecture - #180
Understanding Distributed Tracing in Microservices Architecture
Ch 58Metrics & Monitoring5/5
- #176
- 27
Module 27#186–#195
Search Systems
2 ch · 10/10 readyCh 59Search Fundamentals5/5
Ch 60Elasticsearch / OpenSearch5/5
- #191
Elasticsearch Architecture: How Distributed Search Works - #192
Elasticsearch Shards vs Replicas: Partitioning vs Duplication - #193
Elasticsearch Indexing: Why Can't You Search Your Document Yet? - #194
Elasticsearch Query Execution: How Searches Work Across Shards - #195
Elasticsearch Refresh: Why Your Document Isn’t Searchable Yet
- #191
- 28
Module 28#196–#205
Object Storage & File Systems
2 ch · 10/10 readyCh 61Object Storage5/5
Ch 62Distributed Files5/5
- 29
Module 29#206–#215
Database Deep Dive
2 ch · 10/10 readyCh 63Storage Engines5/5
- #206
Elasticsearch Cluster Sizing: How Many Nodes Do You Need? - #207
Understanding Elasticsearch Node Roles for Scaling Clusters - #208
Elasticsearch Split Brain: Master Election and Quorum Explained - #209
Understanding Elasticsearch Snapshots: Replicas vs Backups - #210
Understanding Elasticsearch Cross-Cluster Replication (CCR)
Ch 64Database Internals5/5
- #211
Understanding Elasticsearch ILM for Cost Management - #212
Elasticsearch Data Streams vs. Time-Based Indices: Which to Choose? - #213
Elasticsearch Zero-Downtime Reindexing: The Alias Switch Trick - #214
Elasticsearch Reindexing: Understanding the Dual-Write Trap - #215
Elasticsearch Query Optimization: Filters and Caching
- #206
- 30
Module 30#216–#216
NoSQL Databases
1 ch · 1/1 readyCh 65Key-Value Stores1/1
- •
Module#217–#234
Elasticsearch Advanced Search
2 ch · 4/18 readyChSearch Relevance & Vector Retrieval4/13
- #217
Elasticsearch Aggregations: Buckets, Metrics, and Cardinality - #218
Elasticsearch Autocomplete: Completion vs. Edge N-Grams vs. Search-as-You-Type - #219
Elasticsearch Fuzzy Search: Handling Typos in Queries - #220
Understanding Elasticsearch Synonyms and Analyzers - #221Elasticsearch Relevance Scoring: BM25, Field Boosting & Query TuningSoon
- #222Elasticsearch Function Score: Business Signals, Recency & Decay FunctionsSoon
- #223Elasticsearch Rescoring: Two-Stage Ranking & Query RescoreSoon
- #224Elasticsearch Hybrid Search: BM25, Vector Search & Reciprocal Rank Fusion (RRF)Soon
- #225Elasticsearch Semantic Search: Embeddings, Inference & Vector IndexingSoon
- #226Dynamo-Style DatabasesSoon
- #227Consistent Hashing in Dynamo-Style SystemsSoon
- #228Quorum-Based ReplicationSoon
- #229Hinted HandoffSoon
Ch 66NoSQL Patterns0/5
- #230Cassandra ArchitectureSoon
- #231Cassandra Partition KeysSoon
- #232Cassandra Clustering KeysSoon
- #233MongoDB ArchitectureSoon
- #234MongoDB ShardingSoon
- #217
- 31
Module 31#235–#244
Time-Series & Analytics
2 ch · 0/10 ready⏳ This module is being recorded. Follow along, it’s coming soon.
Ch 67Time-Series Systems0/5
- #235Time-Series Database ArchitectureSoon
- #236Time-Series Data ModelingSoon
- #237Retention PoliciesSoon
- #238Time-Based PartitioningSoon
- #239Downsampling & AggregationSoon
Ch 68Analytics0/5
- #240OLTP vs OLAPSoon
- #241Data Warehouse ArchitectureSoon
- #242Data Lake ArchitectureSoon
- #243Data Lakehouse ArchitectureSoon
- #244Batch vs Stream ProcessingSoon
- 32
Module 32#245–#254
Stream Processing & Data Pipelines
2 ch · 0/10 ready⏳ This module is being recorded. Follow along, it’s coming soon.
Ch 69Stream Processing0/5
- #245Stream Processing ArchitectureSoon
- #246Event Time vs Processing TimeSoon
- #247WatermarksSoon
- #248Late-Arriving EventsSoon
- #249Windowed AggregationsSoon
Ch 70Data Pipelines0/5
- #250ETL vs ELTSoon
- #251Change Data CaptureSoon
- #252Database CDC with KafkaSoon
- #253Event SourcingSoon
- #254CQRSSoon
- 33
Module 33#255–#264
Security in System Design
2 ch · 0/10 ready⏳ This module is being recorded. Follow along, it’s coming soon.
Ch 71Authentication0/5
- #255Authentication vs AuthorizationSoon
- #256Session-Based AuthenticationSoon
- #257JWT AuthenticationSoon
- #258OAuth 2.0Soon
- #259OpenID ConnectSoon
Ch 72API Security0/5
- #260API KeysSoon
- #261Access Tokens vs Refresh TokensSoon
- #262Token Expiration & RotationSoon
- #263mTLSSoon
- #264Zero Trust ArchitectureSoon
- 34
Module 34#265–#274
Security & Data Protection
2 ch · 0/10 ready⏳ This module is being recorded. Follow along, it’s coming soon.
Ch 73Data Security0/5
- #265Encryption at Rest vs Encryption in TransitSoon
- #266Symmetric vs Asymmetric EncryptionSoon
- #267Hashing vs EncryptionSoon
- #268Password Hashing & SaltSoon
- #269Key Management SystemsSoon
Ch 74Application Security0/5
- #270SQL InjectionSoon
- #271Cross-Site ScriptingSoon
- #272CSRFSoon
- #273SSRFSoon
- #274Secure API DesignSoon
- 35
Module 35#275–#284
Multi-Region & Global Systems
2 ch · 0/10 ready⏳ This module is being recorded. Follow along, it’s coming soon.
Ch 75Global Architecture0/5
- #275Single Region vs Multi-RegionSoon
- #276Active-Passive ArchitectureSoon
- #277Active-Active ArchitectureSoon
- #278Global Load BalancingSoon
- #279GeoDNSSoon
Ch 76Global Data0/5
- #280Cross-Region Database ReplicationSoon
- #281Multi-Region Data ConsistencySoon
- #282Data ResidencySoon
- #283Global FailoverSoon
- #284Disaster Recovery Across RegionsSoon
- 36
Module 36#285–#294
Disaster Recovery & Business Continuity
2 ch · 0/10 ready⏳ This module is being recorded. Follow along, it’s coming soon.
Ch 77Disaster Recovery0/5
- #285Backup vs ReplicationSoon
- #286RPO & RTOSoon
- #287Backup StrategiesSoon
- #288Point-in-Time RecoverySoon
- #289Disaster Recovery TestingSoon
Ch 78Availability Architecture0/5
- #290High Availability ArchitectureSoon
- #291Fault DomainsSoon
- #292Availability ZonesSoon
- #293N+1 RedundancySoon
- #294Eliminating Single Points of FailureSoon
- 37
Module 37#295–#304
Containers & Platform Architecture
2 ch · 0/10 ready⏳ This module is being recorded. Follow along, it’s coming soon.
Ch 79Containers0/5
- #295Containers vs Virtual MachinesSoon
- #296Container NetworkingSoon
- #297Container StorageSoon
- #298Container Health ChecksSoon
- #299Container ScalingSoon
Ch 80Kubernetes0/5
- #300Kubernetes ArchitectureSoon
- #301Kubernetes Pods & DeploymentsSoon
- #302Kubernetes ServicesSoon
- #303Kubernetes IngressSoon
- #304Kubernetes Horizontal Pod AutoscalingSoon
- 38
Module 38#305–#314
Cloud & Infrastructure
2 ch · 0/10 ready⏳ This module is being recorded. Follow along, it’s coming soon.
Ch 81Cloud Architecture0/5
- #305IaaS vs PaaS vs SaaSSoon
- #306Cloud Load BalancersSoon
- #307Cloud Auto ScalingSoon
- #308Cloud Storage ArchitectureSoon
- #309Cloud Database ArchitectureSoon
Ch 82Infrastructure Architecture0/5
- #310Infrastructure as CodeSoon
- #311Immutable InfrastructureSoon
- #312Blue-Green DeploymentSoon
- #313Canary DeploymentSoon
- #314Rolling DeploymentSoon
- 39
Module 39#315–#324
System Design Patterns
2 ch · 0/10 ready⏳ This module is being recorded. Follow along, it’s coming soon.
Ch 83Core Architecture Patterns0/5
- #315API Gateway PatternSoon
- #316Backend-for-Frontend PatternSoon
- #317Strangler Fig PatternSoon
- #318Sidecar PatternSoon
- #319Ambassador PatternSoon
Ch 84Distributed Architecture Patterns0/5
- #320Event-Driven ArchitectureSoon
- #321Pub/Sub ArchitectureSoon
- #322Event Sourcing ArchitectureSoon
- #323CQRS ArchitectureSoon
- #324Materialized View PatternSoon
- 40
Module 40#325–#339
Real-World System Design
This is where Tejav transitions from “learn concepts” to “design systems in interviews.”
3 ch · 0/15 ready⏳ This module is being recorded. Follow along, it’s coming soon.
Ch 85Social & Communication Systems0/5
- #325Design WhatsAppSoon
- #326Design a Chat SystemSoon
- #327Design TelegramSoon
- #328Design SlackSoon
- #329Design a Notification SystemSoon
Ch 86Content & Media0/5
- #330Design YouTubeSoon
- #331Design NetflixSoon
- #332Design InstagramSoon
- #333Design TikTokSoon
- #334Design a Video Upload & Processing SystemSoon
Ch 87Commerce & Payments0/5
- #335Design AmazonSoon
- #336Design an E-Commerce CartSoon
- #337Design a Payment SystemSoon
- #338Design a Payment GatewaySoon
- #339Design an Order Management SystemSoon
- 41
Module 41#340–#349
More Real-World System Design
2 ch · 0/10 ready⏳ This module is being recorded. Follow along, it’s coming soon.
Ch 88Location & Travel0/5
- #340Design UberSoon
- #341Design Google MapsSoon
- #342Design a Ride Matching SystemSoon
- #343Design a Location Tracking SystemSoon
- #344Design a Food Delivery SystemSoon
Ch 89Productivity & Platforms0/5
- #345Design Google DriveSoon
- #346Design DropboxSoon
- #347Design Google Docs CollaborationSoon
- #348Design a Distributed Task SchedulerSoon
- #349Design a Job Queue SystemSoon
- 42
Module 42#350–#359
Advanced System Design
2 ch · 0/10 ready⏳ This module is being recorded. Follow along, it’s coming soon.
Ch 90High-Scale Systems0/5
- #350Design a URL ShortenerSoon
- #351Design Twitter / XSoon
- #352Design a News FeedSoon
- #353Design a Recommendation SystemSoon
- #354Design a Trending Topics SystemSoon
Ch 91Distributed Infrastructure0/5
- #355Design a Distributed Rate LimiterSoon
- #356Design a Distributed Lock ServiceSoon
- #357Design a Distributed ID GeneratorSoon
- #358Design Snowflake-Style Unique IDsSoon
- #359Design a Distributed Configuration ServiceSoon
- 43
Module 43#360–#369
FAANG System Design Interview Mastery
2 ch · 0/10 ready⏳ This module is being recorded. Follow along, it’s coming soon.
Ch 92Interview Problem Solving0/5
- #360How to Estimate QPS in a System Design InterviewSoon
- #361How to Estimate Storage RequirementsSoon
- #362How to Estimate BandwidthSoon
- #363How to Estimate Cache SizeSoon
- #364How to Estimate Database CapacitySoon
Ch 93Architecture Decision Making0/5
- #365How to Choose the Right DatabaseSoon
- #366How to Choose Between SQL and NoSQLSoon
- #367How to Choose Between Kafka, Queue & Pub/SubSoon
- #368How to Choose Between Cache, Database & Search EngineSoon
- #369How to Present a Complete System Design in a FAANG InterviewSoon
mastered started ready coming soon



















































































































































































