Darren Ching-Yen Chan

Darren Ching-Yen Chan

About

Detail

Agency Owner
California, United States

Contact Darren regarding: 
Flexible work
Starting at USD65/hour
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Timeline


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Résumé


Jobs verified_user 0% verified
  • Stealth Startup
    Software Engineer
    Stealth Startup
    Aug 2025 - Oct 2025 (3 months)
    Led development of a microservices architecture using Spring Boot, Docker, and AWS ECS, supporting 1M+ concurrent users with 99.99% uptime. Built and optimized RESTful APIs with Spring Boot, reducing data retrieval time by 70% and improving reliability using JUnit and Postman-based regression suites. Architected an Al-powered proposal generation platform deployed on Kubernetes, integrating OpenAl models and ensuring safe rollouts via Canary deployments. Implemented distributed caching using Redis and Memcached, reducing DB load by 85% and improving API response times by 45%. Enhanced Spring MVC performance by introducing async processing and Redis-backed rate limiting, lowering latency by 50%. Strengthened authentication and transaction sec
  • Wellth
    Backend Engineer
    Wellth
    Feb 2024 - Aug 2025 (1 year 7 months)
    Developed REST APIs for third-party integrations using Spring Boot and documented them with Swagger, enabling a 35% rise in customer satisfaction. Enhanced user experience in web applications using React, TypeScript, and Spring MVC, supporting new enterprise clients. Built responsive mobile-friendly features with Styled Components and TypeScript. Automated Azure infrastructure using Terraform, reducing environment setup from days to hours. Improved SQL performance by optimizing indexes and queries, reducing execution time by 60%. Introduced Jest, Mocha, and Chai unit test suites, increasing code coverage and reducing regressions. Designed and shipped a custom analytics dashboard with D3.js and React for interactive data exploration. Impleme
  • Unstoppable Domains
    Full Stack Developer
    Unstoppable Domains
    Oct 2022 - Oct 2023 (1 year 1 month)
    Built PopCapacity, a warehouse management system using Spring MVC, React, TypeScript, and GraphQL for real-time logistics visibility. Developed Green Rabbit, a blockchain-based NFT game on the WAX blockchain, integrating secure wallet interactions. Designed AWS microservices supporting auto-scaling and implemented CloudFormation templates to standardize environments. Conducted code reviews and enhanced maintainability, reducing production bugs by 25%. Implemented automated API tests using Postman Collections and Newman for CI validation.
  • O
    Software Engineer
    OCTI, INC
    Sep 2020 - Oct 2022 (2 years 2 months)
    Built and optimized REST services using Spring MVC, Hibernate, and Java, reducing response times by 30%. Developed features in React, TypeScript, and JSP, improving UX for high-traffic tools. Integrated 3rd-party services such as Stripe, PayPal, and geolocation APIs. Collaborated with UX teams to deliver pixel-perfect responsive interfaces, achieving top Google Lighthouse scores. Improved observability using Azure Monitor and Application Insights, ensuring SLA compliance. Built CI/CD pipelines that reduced deployment time by 70%. Applied Selenium and Cypress automated Ul testing to reduce manual QA costs.
  • Age of Learning, Inc
    Software Engineer
    Age of Learning, Inc
    Apr 2019 - Sep 2020 (1 year 6 months)
    Designed backend GraphQL schemas and queries in Java/Spring Boot to improve data retrieval efficiency. Contributed to full-stack applications using Struct, React, and PostgreSQL for internal tools serving 500+ employees. Helped migrate legacy systems into microservices deployed on Docker and AWS. Built customer-facing micro-frontends with React, TypeScript, Recoil, and Redux-Saga. Implemented reusable Ul components using Material-UI. Performed cross-browser debugging and added automated Jest tests to prevent regressions.
  • JNR Incorporated
    Software Engineer
    JNR Incorporated
    Oct 2018 - Apr 2019 (7 months)
    Assisted in crafting backend schemas and queries for a GraphQL service to enhance data operations. Contributed to the development of a web app using React, TypeScript, Recoil, and Redux-Saga, focusing on front-end enhancements. Participated in the creation of internal tools with Struct, React, and PostgreSQL, supporting the team's operational needs. Supported the migration of legacy systems to modern microservices architecture, aiding in the improvement of system efficiency. Built basic Ul components using Material-UI to ensure design consistency and usability. Aided in resolving browser compatibility issues and other bugs to improve application reliability.
Education verified_user 0% verified
  • University of California, Davis
    Bachelor of Science (Computer Science)
    University of California, Davis
    Sep 2014 - Jun 2017 (2 years 10 months)