Hi,I'm MasatoTsunematsu

Participated in the research and development of a video streaming system using SDN with OpenFlow, handling design, development, and testing.

Gained knowledge in networking and infrastructure through network programming with Python, in addition to programming skills.

Worked as a database administrator for several B2C companies, responsible for designing, building, testing, and operating Oracle Database, MySQL, PostgreSQL, and SQL Server in both on-premises and AWS environments.

Focused on performance tuning through memory optimization, index design, and SQL refactoring. Achieved efficient operations using infrastructure as code with Terraform and automation scripts.

Also contributed to application development by leveraging experience as a programmer.

Worked as an infrastructure engineer on several government-related projects involving system migration from on-premises to AWS. Responsibilities spanned proposal, requirements definition, design, development, testing, operation, and maintenance.

Migrated proprietary RDBMS to Amazon RDS and Aurora, and transitioned application platforms to Amazon ECS to maximize the benefits of cloud services within practical constraints. Contributed to efficient infrastructure provisioning using IaC tools such as CloudFormation, AWS CDK, and Ansible.

My macOS dotfiles. Automate the setup by deploying configuration files with stow, installing packages with Brewfile, and configuring the OS with defaults command.

The connectivity test tool made with Golang.