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Hi, I’m Liang Xin, a Senior / Staff Software Engineer focused on building scalable full-stack applications and AI-powered platform architectures. I’ve engineered web apps and distributed systems using MERN/MEAN stacks, event-driven pipelines, and LLM-based intelligent workflows, delivering production-ready solutions for high-traffic environments. I enjoy designing agentic AI systems that blend deterministic logic with machine reasoning to personalize user experiences and enable real-time decisions. My work centers on delivering robust, scalable software that teams can trust and expand as business needs grow.…Hi, I’m Liang Xin, a Senior / Staff Software Engineer focused on building scalable full-stack applications and AI-powered platform architectures. I’ve engineered web apps and distributed systems using MERN/MEAN stacks, event-driven pipelines, and LLM-based intelligent workflows, delivering production-ready solutions for high-traffic environments. I enjoy designing agentic AI systems that blend deterministic logic with machine reasoning to personalize user experiences and enable real-time decisions. My work centers on delivering robust, scalable software that teams can trust and expand as business needs grow.

Liang Xin

Full Stack Developer, Web Developer, Back-End Developer, +4

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Hi, I’m Liang Xin, a Senior / Staff Software Engineer focused on building scalable full-stack applications and AI-powered platform architectures. I’ve engineered web apps and distributed systems using MERN/MEAN stacks, event-driven pipelines, and LLM-based intelligent workflows, delivering production-ready solutions for high-traffic environments. I enjoy designing agentic AI systems that blend deterministic logic with machine reasoning to personalize user experiences and enable real-time decisions. My work centers on delivering robust, scalable software that teams can trust and expand as business needs grow.…Hi, I’m Liang Xin, a Senior / Staff Software Engineer focused on building scalable full-stack applications and AI-powered platform architectures. I’ve engineered web apps and distributed systems using MERN/MEAN stacks, event-driven pipelines, and LLM-based intelligent workflows, delivering production-ready solutions for high-traffic environments. I enjoy designing agentic AI systems that blend deterministic logic with machine reasoning to personalize user experiences and enable real-time decisions. My work centers on delivering robust, scalable software that teams can trust and expand as business needs grow.

Available to hire

Hi, I’m Liang Xin, a Senior / Staff Software Engineer focused on building scalable full-stack applications and AI-powered platform architectures. I’ve engineered web apps and distributed systems using MERN/MEAN stacks, event-driven pipelines, and LLM-based intelligent workflows, delivering production-ready solutions for high-traffic environments.

I enjoy designing agentic AI systems that blend deterministic logic with machine reasoning to personalize user experiences and enable real-time decisions. My work centers on delivering robust, scalable software that teams can trust and expand as business needs grow.

Skills

Experience Level

Expert

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Intermediate

Language

English

Fluent

Work Experience

Staff Software Engineer at Walmart Global Tech

January 1, 2024 - Present

Led development of scalable advertising services within Walmart Connect, building high-throughput backend systems and advertiser-facing tools to process 10M+ ad events daily, integrated with ML-driven optimization, maintaining 99.9% availability during peak retail traffic. Designed idempotent, high-throughput ad event ingestion services processing 50M+ daily impressions and click events, implementing Kafka-based asynchronous stream processing to decouple ad services from analytics workloads. Delivered agentic AI orchestration service that continuously analyzed performance signals (CTR, CVR, pacing, spend velocity) to recommend bid and targeting adjustments, reducing manual campaign tuning effort by 30%.

Senior Full-Stack Engineer at Credit Sesame

January 1, 2023 - December 31, 2024

Maintained and enhanced the core authenticated domain supporting 10M+ active financial users, ensuring 99.9% availability across desktop and mobile browsers. Designed and implemented REST services in Node.js/Python to orchestrate LLM-driven workflows, integrating credit bureau data and behavioral signals with 2s response latency. Created backend orchestration services integrating rule-based financial logic with LLM-driven analysis, delivering personalized actions and reducing recommendation processing time by 38% through async inference and caching. Implemented RAG workflows integrated with real-time, event-driven inference pipelines to deliver contextual financial education and personalized AI recommendations, increasing user engagement by 25% and recommendation accuracy.

Software Development Engineer at Amazon

January 1, 2019 - December 31, 2023

Architected an event-driven microservices architecture within the Classification Policy Platform in AWS Cloud, enabling asynchronous processing of billions of ASIN lifecycle events and improving workflow efficiency by 20%. Led the design and implementation of User Preference microservices in AWS, powering configuration management of 10K+ internal users for enterprise-scale compliance workflows. Delivered IDX platform combining React/TypeScript FE with event-driven Node.js/Java microservices on AWS, enabling lifecycle management of 10M+ catalog items through CI/CD release workflows with high scalability and reliability. Improved ML model training and deployment workflows for ASIN compliance classification, enabling scalable evaluation of 1M+ classification events per day to reduce model experimentation turnaround time by 30%.

Software Engineer at MZ

January 1, 2014 - December 31, 2019

Architected React/Redux-based sales and timeline management platforms used by 100+ internal stakeholders, improving workflow efficiency by 50% through centralized state management and dynamic form validation. Programmed configurable revenue and live-ops workflow systems using AngularJS, involving state-machine-driven decision engines and dynamic rule generation tools to support monetization operations, reducing manual event configuration time by 20%. Developed real-time analytics dashboards using AngularJS and HighCharts to visualize user state transitions, in-game economy consumption, and event ROI metrics, supporting live operations for 100K+ active users. Created backend services using PHP and MySQL to support internal monetization and sales tools for GoW to automate targeted emails to 5M+ monthly active users, reducing manual campaign setup time by 30%.

Software Developer at Nor1 Inc

January 1, 2013 - December 31, 2014

Developed and integrated real-time applications running on MEAN stack into eStandby upsell platform to provide interactive data visualizations using HighChart and D3.js. Brought responsive web applications and 10+ cross-client HTML templates optimized for desktop, tablet, and mobile devices, reducing rendering issues by 30%. Implemented Node.js ETL server to process customer booking reservations, automating email trigger workflows to improve processing efficiency by 20%.

Software Developer at Nor1 Inc.

January 1, 2013 - January 1, 2014

Developed and integrated real-time applications running on MEAN stack into eStandby upsell platform to provide interactive data visualizations using HighChart and D3.js. Delivered responsive web applications and 10+ cross-client HTML templates optimized for desktop, tablet, and mobile, reducing rendering issues by 30%. Implemented Node.js ETL server to process customer bookings, automating email trigger workflows to improve processing efficiency by 20%.