As a cloud architect, led the Heroku migration project for WebMD, designing robust cloud systems on AWS. Successfully collaborated with various teams to transition all legacy systems from Heroku to AWS without disruptions. Implemented Terragrunt and Terraform for infrastructure as code, enhancing code structure, optimizing execution time, and minimizing redundancy. Overhauled the CI/CD pipeline and established a comprehensive observability platform for monitoring, logging, and tracing services on AWS. Spearheaded the development of a database monitoring solution to augment database performance. Defined Service Level Indicators (SLI) and Service Level Objectives (SLO), and instituted an effective alerting system. Fostered an on-call culture by implementing and training the organization in incident management practices. Architected systems for the WebMD datacenter in the US, planning migration strategies from AWS. Played a significant role in both internal and external ISO audits.

Managed the infrastructure for Chotot, Mudah, and Carousell across GCP, AWS, and on-premise data centers. Deployed and managed a Kubernetes cluster with over 20 nodes, supporting 200 microservices and cron jobs, and maintaining almost 3000 pods while handling 300 million requests per month. Acted as cloud architect for Chotot and Mudah, aiming to integrate the cloud infrastructures of both companies. Defined an Infrastructure-as-Code framework for Chotot and Mudah using GCP and AWS. Executed a cloud migration project that involved the migration of approximately 200 microservices, over 30 databases, caches, and message queues from the Vietnam data center to Google Cloud Platform. Developed a chat platform for Chotot, Mudah, and Carousell, which replaced Twilio chat and significantly reduced costs. Established SLI and SLO in collaboration with product owners and other teams. Defined and implemented an incident management process while participating in the on-call rotation. Created a developer portal to handle CI/CD processes, replacing existing GitHub Action or Travis CI setups and serving as a GitOps tool akin to ArgoCD for managing and deploying resources on Kubernetes. Standardized CI/CD flows and built a new CI/CD system for Chotot and Mudah, integrating it as part of the developer portal initiative. Developed a version auto-generation tool based on business requirements. Established a secret management system for Chotot and Mudah. Provided database performance troubleshooting and analysis. Developed a simplified incident management tool akin to Opsgenie. Collaborated with the security team to implement a zero-trust solution for Chotot and Carousell. Consulted with the data team on building a data warehouse and data processing pipelines. Supported the software team in examining and selecting technical stacks for new services. Assisted Mudah SRE in applying GitOps for Ansible, application configuration, and Terraform. Collaborated with Mudah SRE in developing a new monitoring solution capable of storing and querying monitor data for three years. Provided technical consultation to Engineering Managers and the Head of Tech. Conducted cloud cost optimization. Responsible for recruiting and training new team members.

Responsible for ensuring the reliability of the Vexere product by building and maintaining a robust monitoring system capable of supporting data queries for up to two years. Developed a comprehensive logging system that retains logs for one year for auditing and debugging purposes. Implemented automated provisioning of AWS and GCP resources using Terraform and established CI/CD pipelines for Terraform code. Applied infrastructure as code principles to manage Cloudflare configurations. Automated server configuration with Ansible, ensuring all system components are automatically configured. Optimized and developed new CI/CD workflows, including creating a CI/CD framework. Developed tools to optimize costs in testing and UAT environments. Created a secret management system and defined processes for its application in running services. Provided consultancy to the Data Team in building data processing and Business Intelligence systems. Proposed and implemented an API Gateway solution after presenting it to the technical architect team, ensuring its protection and application in the production environment. Proposed and implemented a GitOps solution, which was presented and applied in the production environment with input from the technical architect team.

Developed a comprehensive data platform with a total storage capacity exceeding 2 PB, processing approximately 500 GB of data daily. Deployed and managed a bare metal Kubernetes cluster consisting of 16 nodes with around 500 CPUs and 1 TB of memory, hosting over 700 pods. Implemented and maintained Prometheus for monitoring with Consul for service discovery. Designed Grafana dashboards using PromQL for efficient service visualization. Managed an ELK cluster efficiently handling a monthly data input exceeding 200 GB. Conducted weekly reviews of server monitoring metrics and system audit logs to identify and address unusual events. Provided databases as a service, including Postgres, MySQL, and Redis. Optimized Docker images for platform software. Managed deployments of Hadoop, Yarn, Airflow, Zeppelin, Jupyter, Metabase, Presto, and Kafka. Maintained a Ceph storage cluster and deployed applications on Kubernetes using GitOps. Developed innovative data processing solutions with Spark streaming and Delta lake for enhanced efficiency. Collaborated with data and product teams to ensure timely data ingress to Hadoop and establish SLI and SLO benchmarks for services, including SLA monitoring and alerting protocols.

Led the construction of a comprehensive CI/CD system. Managed the deployment and monitoring of application systems. Developed backend solutions for various products. Deployed and maintained cloud resources for customers on AWS and GCP. Handled the deployment and maintenance of bare metal Kubernetes clusters. Designed and implemented a monitoring-as-a-service system using Prometheus and Grafana. Responsible for deploying and maintaining GitLab, MySQL, and Proxy servers. Wrote infrastructure as a service (IaaS) scripts for AWS resources, ensuring robust management and deployment.