Replay and Reprocessing in Event-Driven Systems
Learn how to replay event streams safely, choose offsets and cursors, isolate side effects, and recover projections without confusing replay with retry.
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TCP Congestion Control: Flow, Loss, and Fairness
Learn how TCP congestion control limits traffic, responds to ACKs and loss, and affects throughput, latency, and fairness, with Linux inspection commands.
Trace and Secure a Web Request
Trace a web request from DNS through routing, TCP, TLS, and HTTP with safe commands, then classify failures and review least-privilege security evidence.
Backend Engineering Roadmap
Build the skills to design, secure, test, deploy, and operate backend services, from programming fundamentals through databases and distributed systems.
Backend Configuration, Environments, and Dependencies
Learn how backend services load configuration, separate development from production, validate settings, and manage dependencies without leaking secrets.
Background Jobs, Scheduling, and Worker Pools
Design background jobs and worker pools with bounded concurrency, safe retries, scheduling, and production checks that keep slow work out of request paths.
Choosing a Backend Programming Language
Compare Python, JavaScript, Java, Go, and C# for backend work, then choose a first language based on your goals, project needs, and learning path.
Consumer-Driven Contract Testing for Backend Services
Learn how consumers define API expectations and providers verify them in CI, with practical workflows, failure modes, and deployment safeguards.
CSRF, CORS, and SSRF: Defending Web Request Boundaries
Learn how CSRF, CORS, and SSRF differ, then apply cookie, origin, allowlist, and egress controls to protect browser and server request boundaries.
Debugging Backend Applications
Use a repeatable backend debugging workflow to reproduce failures, inspect evidence, test one hypothesis at a time, and verify fixes safely in production.