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Lessons (17)

• System Design Interview Framework

  A seven-step path from an ambiguous prompt to a clear, trade-off-aware architecture discussion. ![Interview flow …

• What Is Software Architecture?

  … Learn quality attributes, trade-offs, the main architecture styles, and how to record decisions with ADRs. The big …

• Proxies, APIs and Real-Time Protocols

  … l6/protocols-realtime.svg) Need Good starting point Trade-off --- --- --- Public resource API REST over HTTPS Familiar and …

• Data Structures for Scale

  … l6/scale-data-structures.svg) Structure Useful question Trade-off --- --- --- Geohash / S2 / H3 What is near this location …

• The L6 System-Design Thinking Loop

  … Explain metrics, mitigation, and the durable fix. 💡 A good trade-off is specific: “I accept a few seconds …

• Kafka Producers

  … the speed knobs Setting Meaning Trade-off --- --- --- linger.ms Wait up to N ms to fill a batch …

• Event-Driven Architecture

  … Broker vs mediator topologies, the four kinds of event patterns, event design, and the real trade-offs. The …

• What Are Design Patterns?

  … They use known solutions, like "spiral staircase" or "L-shaped staircase", each with known trade-offs. When one …

• Microkernel (Plugin) Architecture

  … services called over HTTP/gRPC Webhooks, Shopify apps Trade-offs ✅ Strengths ❌ Weaknesses --- --- Extensible without touching the core Designing …

• CQRS & Event Sourcing

  … Powerful patterns, explained simply, with honest trade-offs. Part 1: CQRS The big idea A restaurant kitchen and …

• Monolith vs Microservices

  … events .- IS[Inventory svc] -- IDB[(inventory DB)] end The trade-offs Monolith Microservices --- --- --- Deploy Everything at once Each …

• DSA Interview Patterns Cheat Sheet

  … Mention trade-offs. 💡 Interviewers care about your thinking as much as the answer. Silence is the enemy; narrate …

• API Gateway, BFF & Service Discovery

  … Golden-signal metrics and traces for every call Trade-off: more moving parts, extra latency per hop and …

• Serverless Architecture

  … L3["λ update search"] -- OS[(OpenSearch)] Limits and trade-offs Limitation Typical value / impact --- --- Max execution time ~15 …

• Scaling, Load Balancing & Rate Limiting

  … take 1 OK[✅ 200 OK] Check -- no Rej[❌ 429 Too Many Requests] Algorithm Idea Trade-off --- --- --- Fixed window …

• Vertical Slice Architecture & the Modular Monolith

  … simple read needn't pass through six layers Trade-offs ✅ Features are easy to find, change and delete …

• Data in Microservices: Sagas & the Outbox Pattern

  … Options: Approach How Trade-off --- --- --- API composition A BFF/gateway calls each service and joins in memory Simple …