Backend engineer building reliable systems where state, failure, and recovery matter.

I work mainly with Java/Kotlin, Spring, TypeScript, Python, Redis, RabbitMQ, and AWS. My interests are distributed-workload design, concurrency contracts, resilient browser automation, and turning production constraints into small, verifiable APIs.

• Resource reputation and recovery — reputation-pool is a dependency-free Java engine for leasing resources that can fail, cool down, and recover. reputation-pool-cloud is its hosted open-core counterpart.
• Asynchronous workload pipelines — I design boundaries around queues, session ownership, idempotency, backpressure, and failure recovery for long-running external work.
• Backend systems that can be explained — I prefer explicit state transitions, measurable invariants, and tests that challenge the contract rather than merely exercise the happy path.

I am a Backend Engineer at Lemong, an AI company building services for the F&B industry.

• 댓글몽 helps independent store owners bring delivery-platform reviews into one place, generate AI response drafts, detect dissatisfied customers, and schedule tailored replies.
• 댓글몽 Biz gives franchise headquarters and stores shared AI review operations, cross-store review/order/sales insights, and marketing-reply workflows for customer retention.

I work across the backend APIs, browser-automation workers, and asynchronous job pipelines that make those customer-facing workflows reliable at scale.

I am a member and contributor of Kotest, the Kotlin testing framework. My work there focuses on public API design, concurrency-safe extension points, and Kotlin Multiplatform correctness.

• Designed and implemented a type-safe, hierarchical test metadata API — #5905 for #5103. The design separates registration-time mutation from immutable execution-time snapshots.
• Replaced a global custom equality registry with a comparison-scoped DSL, avoiding nondeterminism under parallel test execution — #6010 for #5910.
• Preserved Kotlin assertion type safety while fixing a Kotlin/Native IR linker failure — #5789, #5828.

Other merged Kotest work covers JSON matcher extensibility, JSON Schema anyOf / oneOf, assertion diagnostics, and fluent assertion consistency: #5756, #5795, #5807, #5835.

I also contribute across the JVM ecosystem:

• Lettuce #3762 — removed a blocking Mono.block() path from Redis URI masking so reactive threads do not fail during connection setup.
• Armeria #6683 and #6713 — improved built-in configuration and graceful-shutdown documentation.

I keep exploring and contributing around Spring Batch, Spring Cloud, Redis clients, service frameworks, and test infrastructure.

I write design notes about concurrency, resource ownership, queue behavior, and public API boundaries at my engineering blog.