Looks like you have JavaScript disabled. For the full Twine experience, you will need to re-enable it.

Hi, I’m Ling Lok Ngai, a backend-focused software engineer who designs, builds, and maintains scalable distributed systems. I specialize in Java, Spring Boot, Solr, AWS, and microservices, and I love turning complex back-end initiatives into reliable, high-performance services that power millions of user queries in the e-commerce domain. I’m passionate about clean architecture, system reliability, continuous learning, and using LLMs to speed up debugging and documentation. I enjoy collaborating across product, design, QA, and data teams to deliver features with measurable impact on performance, scalability, and customer satisfaction.…Hi, I’m Ling Lok Ngai, a backend-focused software engineer who designs, builds, and maintains scalable distributed systems. I specialize in Java, Spring Boot, Solr, AWS, and microservices, and I love turning complex back-end initiatives into reliable, high-performance services that power millions of user queries in the e-commerce domain. I’m passionate about clean architecture, system reliability, continuous learning, and using LLMs to speed up debugging and documentation. I enjoy collaborating across product, design, QA, and data teams to deliver features with measurable impact on performance, scalability, and customer satisfaction.

Ling Lok Ngai

Back-End Developer, Full Stack Developer, Web Developer, +2





Hi, I’m Ling Lok Ngai, a backend-focused software engineer who designs, builds, and maintains scalable distributed systems. I specialize in Java, Spring Boot, Solr, AWS, and microservices, and I love turning complex back-end initiatives into reliable, high-performance services that power millions of user queries in the e-commerce domain. I’m passionate about clean architecture, system reliability, continuous learning, and using LLMs to speed up debugging and documentation. I enjoy collaborating across product, design, QA, and data teams to deliver features with measurable impact on performance, scalability, and customer satisfaction.…Hi, I’m Ling Lok Ngai, a backend-focused software engineer who designs, builds, and maintains scalable distributed systems. I specialize in Java, Spring Boot, Solr, AWS, and microservices, and I love turning complex back-end initiatives into reliable, high-performance services that power millions of user queries in the e-commerce domain. I’m passionate about clean architecture, system reliability, continuous learning, and using LLMs to speed up debugging and documentation. I enjoy collaborating across product, design, QA, and data teams to deliver features with measurable impact on performance, scalability, and customer satisfaction.

Available to hire

Hi, I’m Ling Lok Ngai, a backend-focused software engineer who designs, builds, and maintains scalable distributed systems. I specialize in Java, Spring Boot, Solr, AWS, and microservices, and I love turning complex back-end initiatives into reliable, high-performance services that power millions of user queries in the e-commerce domain.

I’m passionate about clean architecture, system reliability, continuous learning, and using LLMs to speed up debugging and documentation. I enjoy collaborating across product, design, QA, and data teams to deliver features with measurable impact on performance, scalability, and customer satisfaction.

Skills

Experience Level

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Language

Javanese

Advanced

Work Experience

Software Development Engineer (Remote) at Zappos.com

January 1, 2023 - November 14, 2025

Design and maintain backend search infrastructure using Java, Spring Boot, Solr, AWS, and microservices, handling millions of user queries daily. Restructured Solr indexing from styleId to productId and integrated nested documents to reduce query load by 10% and improve facet accuracy. Implemented dynamic filtering logic in backend services to auto-facet product brands and types based on ML-inferred user intent, increasing facet click rate by 1.25% and reducing explicit re-searches by 0.5%. Simplified shoe width options by mapping technical labels to user-friendly categories, increasing discoverability and boosting add-to-cart rate by 1.5%. Created RESTful APIs and event-driven services with fallback and rollback mechanisms. Owned and maintained CloudFormation/CDK stacks for search microservices, including ECS/Fargate deployment, ALB, and VPC configurations. Collaborated across teams (Catalog, Mobile, QA, Product) to deliver features with end-to-end quality and test coverage.

Data Analyst at Endless Technology Inc.

January 1, 2023 - January 1, 2023

Built Python web scraping and data pipelines, improving team efficiency by 25%. Created SQL dashboards and ETL pipelines for business reporting and forecasting. Partnered with product and sales leads to build forecasting reports that influenced quarterly planning.

Software Development Engineer at Zappos.com

January 1, 2023 - November 14, 2025

Design and maintain backend product search infrastructure using Java, Spring Boot, Solr, AWS, and microservices, handling millions of user queries daily. Restructured Solr indexing (style Id to productId) and integrated nested documents to reduce query load and improve facet accuracy. Implemented dynamic filtering to auto-facet top brands and product types based on ML-inferred user intent, increasing facet click rate and reducing explicit re-searches. Simplified shoe-width options by mapping technical labels to user-friendly categories, boosting discoverability and add-to-cart rate. Created RESTful APIs and event-driven services with fallback and rollback mechanisms. Owned and maintained CloudFormation/CDK stacks for search microservices (EC2/ECS/Fargate), ALB, S3, and VPC configurations. Collaborated across Catalog, Mobile, QA, and Product teams to deliver features with end-to-end quality and test coverage.