xiaoqi l.

Senior backend engineer (Go / Python) with 6+ years building high-traffic production systems: large-scale recommendation systems, big data infrastructure, and streaming pipelines. What I work on • Recommendation systems: candidate generation, ranking, real-time feature serving • Data infrastructure: batch and streaming pipelines with Kafka & Kinesis • Experimentation: feature flags and A/B testing (maintainer of Bucketeer, open-source, Go) • Backend services and APIs: design, scaling, refactoring, architecture reviews • Python quant tooling: market data pipelines, broker API automation, ML-based volatility models Stack • Languages: Go, Python, Java • Data & messaging: Kafka, Kinesis, MySQL, PostgreSQL, Elasticsearch • Infra: Docker, Kubernetes, AWS, GCP Based in UTC+8, with good overlap with Japan, Asia-Pacific, and US evenings.