Open to opportunities

chang liu

@changliu1

Message

I build high-throughput backend systems for social content, recommendations, and ticketing.

China

Message

What I'm looking for

I'm looking for backend engineering work on high-throughput distributed systems, real-time recommendation, and production infrastructure, ideally in a fast-paced cross-functional environment with algorithm, client, and infrastructure teams.

At ByteDance, I build backend services for Douyin social content and on-device recommendation, including comment threading, @mention notifications, interactive sticker metadata, and real-time personalization platforms. I design Go APIs serving 10M+ DAU traffic paths with P99 latency under 30ms, and I build tooling that improved testing efficiency by 30%.

Previously at Trip.com, I optimized ticket ordering infrastructure handling flash-sale spikes above 50,000 QPS, fixed distributed inventory overselling, and reduced peak perceived order latency from about 800ms to under 100ms through RabbitMQ asynchronous processing. I also bring speech-recognition research experience from Shanghai AI Laboratory, where I processed audio datasets and evaluated Whisper, Kaldi, and WeNet.

Experience

Work history, roles, and key accomplishments

Current

Backend Engineer, Social Content & On-Device Intelligence

Current

ByteDance

Mar 2025 - Present (1 year 5 months)

Led backend development of core social content features on Douyin, including comment threading, @mention notification pipelines, and interactive sticker metadata services. Architected an on-device personalized recommendation platform and contributed to story recommendation recall and ranking backend.