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Christopher Xu

@christopherxu

Senior Software Engineer at Zoolatech who built production LLM retrieval pipelines and resilient Go services.

At Zoolatech, I designed Python/FastAPI services connecting product workflows to language models, retrieval pipelines, and external APIs. I built document ingestion and retrieval on PostgreSQL and pgvector, returning source references with generated responses.

I also built Go integration services and Kafka consumers with bounded concurrency, cancellation, idempotent processing, and retry handling. At Airbnb, I built payment orchestration APIs and booking and payout event handlers designed to prevent duplicate processing.

Experience

Work history, roles, and key accomplishments

Senior Software Engineer

Zoolatech

Sep 2024 - Sep 2026 (2 years)

Designed and shipped Python/FastAPI services connecting product workflows to language models and retrieval pipelines. Built Go integration services and Kafka consumers with idempotent processing, and developed LangGraph workflows for multi-step tool execution.

Python fastAPI Go Kafka PostgreSQL Pgvector LangGraph Lang Chain AWS Kubernetes Terraform Docker CI CD OpenTelemetry Prometheus Grafana

Software Engineer

Airbnb

Mar 2020 - Sep 2024 (4 years 6 months)

Built backend APIs for payment orchestration and developed idempotent Kafka handlers for booking and payout events. Investigated production latency and strengthened payment and booking workflows with automated coverage.

Python Go Kafka PostgreSQL AWS Kubernetes REST APIs Microservices Distributed Systems CI CD

Full Stack Developer

Tata Consultancy Services

Oct 2018 - Feb 2020 (1 year 4 months)

Developed application features, APIs, SQL workflows, and integrations for enterprise client systems. Modernized legacy modules and supported QA and production releases.

SQL APIs Integration Testing Deployment