A long-running personal site for technology, life, projects, and ideas.https://zjh-personal-site.pages.dev/enhttps://zjh-personal-site.pages.dev/en/notes/software/architecture/api-contract-collaboration-guide/https://zjh-personal-site.pages.dev/en/notes/software/architecture/api-contract-collaboration-guide/A practical API contract guide covering REST, OpenAPI, errors, pagination, authentication, compatibility, and frontend-backend delivery workflow.Fri, 15 May 2026 00:00:00 GMThttps://zjh-personal-site.pages.dev/en/notes/software/architecture/frontend-backend-architecture-map/https://zjh-personal-site.pages.dev/en/notes/software/architecture/frontend-backend-architecture-map/A practical map for understanding how frontend, backend, data, deployment, and observability fit together in modern web systems.Fri, 15 May 2026 00:00:00 GMThttps://zjh-personal-site.pages.dev/en/notes/software/backend/auth-access-control-practical-guide/https://zjh-personal-site.pages.dev/en/notes/software/backend/auth-access-control-practical-guide/A practical guide to login, sessions, cookies, JWT, OAuth, RBAC, resource-level authorization, frontend/backend collaboration, and launch checks.Fri, 15 May 2026 00:00:00 GMThttps://zjh-personal-site.pages.dev/en/notes/software/backend/backend-architecture-practical-guide/https://zjh-personal-site.pages.dev/en/notes/software/backend/backend-architecture-practical-guide/A practical backend architecture guide covering APIs, service layers, databases, cache, async jobs, reliability, observability, and deployment.Fri, 15 May 2026 00:00:00 GMThttps://zjh-personal-site.pages.dev/en/notes/software/backend/database-cache-practical-guide/https://zjh-personal-site.pages.dev/en/notes/software/backend/database-cache-practical-guide/A practical guide to database choices, schema design, constraints, indexes, transactions, migrations, Redis caching, and cache consistency in real projects.Fri, 15 May 2026 00:00:00 GMThttps://zjh-personal-site.pages.dev/en/notes/software/devops/harness-cicd-delivery-guide/https://zjh-personal-site.pages.dev/en/notes/software/devops/harness-cicd-delivery-guide/A practical guide to Harness CI/CD, covering pipelines, stages, steps, services, environments, infrastructure definitions, feature flags, and real project adoption.Fri, 15 May 2026 00:00:00 GMThttps://zjh-personal-site.pages.dev/en/notes/software/devops/observability-reliability-practical-guide/https://zjh-personal-site.pages.dev/en/notes/software/devops/observability-reliability-practical-guide/A practical guide to logs, metrics, traces, alerting, SLOs, error budgets, incident review, and launch checks for real production systems.Fri, 15 May 2026 00:00:00 GMThttps://zjh-personal-site.pages.dev/en/notes/software/frontend/frontend-engineering-architecture-guide/https://zjh-personal-site.pages.dev/en/notes/software/frontend/frontend-engineering-architecture-guide/A practical frontend architecture guide covering rendering modes, components, state, data loading, performance, and delivery.Fri, 15 May 2026 00:00:00 GMThttps://zjh-personal-site.pages.dev/en/notes/robotics/ros/robot-urdf-modeling-guide/https://zjh-personal-site.pages.dev/en/notes/robotics/ros/robot-urdf-modeling-guide/A practical route for understanding, validating, and improving robot description files across links, joints, frames, URDF/Xacro, robot_state_publisher, RViz, and MoveIt.Thu, 14 May 2026 00:00:00 GMThttps://zjh-personal-site.pages.dev/en/notes/software/devops/docker-daily-development-guide/https://zjh-personal-site.pages.dev/en/notes/software/devops/docker-daily-development-guide/A daily Docker workflow covering images, containers, Dockerfile, Compose, persistence, and the commands that matter in real development.Thu, 14 May 2026 00:00:00 GMThttps://zjh-personal-site.pages.dev/en/notes/software/tools/git-commit-history-workflow/https://zjh-personal-site.pages.dev/en/notes/software/tools/git-commit-history-workflow/A reusable daily Git guide covering core concepts, common commands, checkout habits, collaboration, and productivity tools.Thu, 14 May 2026 00:00:00 GMThttps://zjh-personal-site.pages.dev/en/journal/spring-room/https://zjh-personal-site.pages.dev/en/journal/spring-room/A small note about space, light, and beginning again.Tue, 12 May 2026 00:00:00 GMThttps://zjh-personal-site.pages.dev/en/journal/a-small-walk/https://zjh-personal-site.pages.dev/en/journal/a-small-walk/A few lines that appeared on the road.Mon, 11 May 2026 00:00:00 GMT