• Led the migration of a 40k+ lines Node.js codebase from JavaScript to TypeScript, resulting in a 50% reduction in runtime errors, a 20% improvement in development efficiency through better code maintainability• Implemented unit testing from scratch for a Node.js codebase, writing 100+ tests to elevate code coverage from 0% to 30%, significantly enhancing code reliability and reducing reported bugs by 40%• Constructed a local mock database and integrated it into the CI/CD pipeline, facilitating over 100+ unit andintegration tests, which reduced testing time by 30%• Integrated GitHub Actions to automate running 100+ unit tests for every PR created and merged, leading to a40% reduction in integration errors and speeding up the code review process by 25%• Created a script that successfully migrated 1.2 million rows from Firebase RTDB to a managed MySQL database, resulting in a 2x increase in data processing speed and 30% cost savings in database managemen

• Forked Grafana aand integrated 2 proprietary company data sources, enhancing data visualization capabilities for improved analytics efficiency• Migrated several Gigabytes of SQL data to Elasticsearch for integration with Kibana and the ELK stack, resulting in a 60% faster data retrieval and significantly improving analysis and visualization efficiency• Integrated OpenID single sign-on into an Angular application, streamlining authentication for 100+ users, reducing login times by 70%, and enhancing security compliance

• Optimized Vue.js frontend initial load time by 26% by implementing lazy loading, leading to a 15% decrease in bounce rates and an enhancement in user session duration by 20%, improving overall user engagement• Utilized AWS services including EC2, S3, RDS, and Route 53 to deploy a Vue.js frontend, Node.js backend, and MySQL database, achieving 99.9% uptime, and reducing hosting costs by 20% through optimized resource utilization

• Developed 15+ static websites and templates, using responsive design to improved mobile user engagement by 50%