Project TicketBox is Vietnam's leading online event ticketing platform.- Achieved a 2x performance boost and 50% cost reduction by rebuilding the architecture TicketBox with a 100% Golang implementation.- Designed and developed a Queue Customer Waiting Room system to handle massive event traffic (BlackPink, WestLife, Super Junior, etc.) with peak 300k CCU, 25k RPS, and P95 latency <= 100ms.- Significantly improved search and listing event performance, reducing latency by 70%, through the implementation of a CDC system for PostgreSQL and sink to Elastic Search.Project Buy Now Pay Later: Offer installment plans for physical product purchases on Tiki using a credit-based payment account.- Led a backend team (5 members) to develop the product from scratch, used by 100k users daily.- Integrated with partners Home Credit and Lotte Credit to design and implement core features.- Mentored and trained junior engineers on best practices, code reviews, and architectural design.

Project Sendo Farm:- Led the development and maintenance of Sendo Farm, a high-traffic web application used by 500k users monthly- Designed and developed a Highly Scalable and Reliable Micro Service backend system using Golang and k8s with communication between services handled via gRPC- Implemented gRPC-based Micro Services for internal services within the platform, including authentication and authorization- Worked on database schema design and optimization using MongoDB, Elastic Search, and Redis- Collaborated with cross-functional teams to deliver high-quality software solutions- Monitored application with high traffic peak at 6k request per secondMaintenance core legacy system: Product Service, Checkout Service, LiveStream Service:- Implement new feature- Improve performance, fix memory leak, load testing.- Monitored and resolved production issues around the clock, ensuring minimal downtime and maximum customer satisfaction- Demonstrated proficiency in troubleshooting various technical issues, providing timely and effective solutions to ensure seamless operations- Implemented and enhanced monitoring tools and processes to proactively detect and prevent issues, resulting in improved overall system performanceProject Buy Now Pay Later, Lending:- Designed and implemented Buy Now Pay Later, Lending services using the AWS Serverless ecosystem, including NodeJS, Lambda functions, API Gateway, S3, SQS, Step function, and DynamoDB- Developed event-driven architectures using AWS Lambda, S3, and SNS to handle asynchronous processing, notifications, and other requirements- Optimized database performance DynamoDB by tuning query performance and implementing indexing strategies- Implemented continuous integration and deployment (CI/CD) pipelines using Jenkins and GitLab- Mentored and trained junior engineers on best practices, code reviews, and architectural design, including the use of AWS Serverless ecosystem components.

- Implement new feature of invoicing portal for cliens- Backend working with AWS service EC2, SES, S3, Lamba function (Nodejs, Typescripts), Serverless, liquibase, sequelize.- Database: Mysql, SQL server.- Frontend working with Angular 7, RxJS, Ngrx, React Native, Redux...

- Good knowledge about Scrum Agile, and worked in Jira- Working mainly with ReactJS, Redux and React Native on more projects of the company.- Optimization for better performance.