As a full-time developer and team leader, I manage the company's server infrastructure and have successfully designed and implemented Kubernetes (K8s) systems to enhance operational efficiency. In addition to my role as a software developer, I also work as a DevOps engineer. My work includes the development of key products such as:- Manage and operate Nexpando cloud infrastructure with 60+ machines- Manage and operate Nexpando's K8S server with 2 clusters, 20+ machines- Led a team to develop a server and app for Sun Group's amusement parks (Sunworld Bà Nà Hills, Sunworld Hạ Long, Sunworld Fansipan, and others)- Develop plugins for core ticketing, including payment connectors for VNPAY QR/CARD and e-invoice issuance, and others- Led a team to develop a ticketing website using Next.js, addressing the online ticketing needs of football clubs, theatres, amusement parks, and more.- Develop Nextix Checkin App with over 200 devices active monthly- Led a team to develop CES (on VNPAY Wallet) with over 10,000 usersAll of these products are actively in use today.