Daniel Cho - Backend Engineer

7 years building backend systems. Focused on high-throughput data pipelines and distributed storage. I care about correctness, observability, and writing systems that operators can reason about at 3am.

Previously infrastructure at Coupang, now doing contract work and maintaining a few open-source projects.

Tech Stack

Go Rust Python PostgreSQL Redis Kafka gRPC Kubernetes Terraform ClickHouse

Open Source

strmux Go

Lightweight stream multiplexer for building custom RPC protocols. Zero-alloc hot path, backpressure-aware.

342 stars28 forks

pagecache-rs Rust

Lock-free page cache for embedded storage engines. Inspired by LMDB with concurrent reader support.

189 stars14 forks

sqldiff Python

Schema-aware SQL migration diffing tool. Generates safe, reviewable ALTER statements from two snapshots.

127 stars9 forks

watchpg Go

Real-time PostgreSQL replication slot monitor with Prometheus metrics and Slack alerting.

86 stars11 forks

Writing

Debugging a 40ms Tail Latency in Our gRPC Gateway Mar 2026

Why We Stopped Using Connection Pooling (and What We Did Instead) Jan 2026

Building a WAL That Survives Kernel Panics Nov 2025

Practical Backpressure Patterns in Go Sep 2025

ClickHouse for Application Engineers: What I Wish I Knew Jul 2025

Experience

Senior Backend Engineer

Coupang

2021 - 2025 · Data infrastructure team

Backend Engineer

Toss (Viva Republica)

2019 - 2021 · Payment processing

Software Engineer

Naver Cloud

2017 - 2019 · Object storage