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Applied Systems
Applied Systems
120 articles covering applied systems concepts, patterns, and interview questions.
Architecture Scenarios
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How to choose a tech stack in an interview
What happens when you type a URL and press Enter
Cost optimization strategies in system design
Database and service migration strategies
Designing a real-time active user counter
How online database migrations work without downtime
How Things Work
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How Apache Flink checkpoints streaming state
How S3 stores and retrieves objects
How DynamoDB works internally
How Cassandra distributes and replicates data
How PostgreSQL executes a query
How Nginx processes a request
Cloud Services
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AWS core services for system design interviews
Azure core services for system design interviews
GCP core services for system design interviews
Incident Response
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Debugging a production incident
Writing a blameless post-mortem
Post-mortems
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Post-mortem: AWS Kinesis cascade 2020
Post-mortem: CrowdStrike BSOD 2024
Post-mortem: GitHub MySQL replication lag
Post-mortem: Slack message delays 2022