Backend / infrastructure engineer focused on Go, Java, distributed systems, storage, networking, and practical developer tooling.

I keep this profile centered on code that can be read, run, and reviewed: reusable service foundations, database internals, systems notes, and small upstream fixes where behavior, API contracts, or documentation were ambiguous.

• Backend service foundations: configuration, structured logging, health checks, graceful shutdown, Docker packaging, and CI hygiene.
• Distributed systems and storage: database internals, indexing, recovery, query execution, replication experiments, RPC, and observability.
• Open-source maintenance work: narrow fixes, reproducible reports, compatibility edge cases, and documentation that reduces reviewer ambiguity.
• Developer-facing assets: templates, notes, checklists, and examples that are easy to run locally and inspect in public.

• happydb — Java database internals project covering storage, indexing, MVCC-style visibility, recovery, query execution, optimization, and replication experiments.
• go-service-starter — minimal production-minded Go HTTP service starter with config loading, structured logging, health checks, graceful shutdown, and Docker packaging.
• go-http-middleware-kit — reusable net/http middleware for request IDs, structured logging, panic recovery, timeouts, and real IP handling.
• CSAPPLabsAndNotes — CS:APP lab notes and systems-learning material.

Selected upstream work includes behavior fixes, compatibility cleanup, and documentation improvements across infrastructure projects:

• HashiCorp go-retryablehttp: retry semantics, logger safety, request-body edge cases, deadline-aware waits, and zero-value client behavior.
• Prometheus client_golang / procfs: timestamp limit handling, proc stat parser limits, and wrapped process counters.
• golang-jwt/jwt: required issued-at validation option.
• go-chi/chi: Host-based routing behavior in RouteHeaders.
• spf13/pflag: typed empty values, bool-like flags, IP defaults, and parser compatibility fixes.
• urfave/cli: shell-completion and legacy alias handling.
• GitHub CLI, OpenTelemetry, GitHub Docs, Docker Docs, and rclone documentation / developer-experience fixes.

• For backend engineering style: start with go-service-starter and go-http-middleware-kit.
• For storage and systems depth: start with happydb and CSAPPLabsAndNotes.
• For upstream contribution history: see the linked contribution ledger and repository activity.

Languages:      Go, Java, C/C++, SQL, TypeScript
Interests:      Backend infrastructure, RPC, distributed systems, storage, networking
Strengths:      CS fundamentals, source-level debugging, reusable engineering assets
Open to:        Backend / infrastructure / systems engineering opportunities

• Portfolio: happysnaker.github.io/Resume
• Blog / project pages: happysnaker.github.io
• Technical proof index: docs/technical-proof-index.md
• Upstream contribution ledger: docs/upstream-contribution-ledger.md
• Email: happysnaker@foxmail.com