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I'm Kazuya Yoshimura, a backend-focused software engineer specializing in Golang and TypeScript. I design and build scalable backend services, API architectures, and cloud infrastructure that perform reliably under load and are easy to operate. I love optimizing performance, tuning databases, and improving developer productivity through solid CI/CD, clear architecture, and close collaboration with product teams. Based in Tokyo, I partner with clients and teams worldwide to deliver robust software solutions on AWS and beyond.…I'm Kazuya Yoshimura, a backend-focused software engineer specializing in Golang and TypeScript. I design and build scalable backend services, API architectures, and cloud infrastructure that perform reliably under load and are easy to operate. I love optimizing performance, tuning databases, and improving developer productivity through solid CI/CD, clear architecture, and close collaboration with product teams. Based in Tokyo, I partner with clients and teams worldwide to deliver robust software solutions on AWS and beyond.

Kazuya Yoshimura

Back-End Developer, Web Developer, Full Stack Developer, +2

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I'm Kazuya Yoshimura, a backend-focused software engineer specializing in Golang and TypeScript. I design and build scalable backend services, API architectures, and cloud infrastructure that perform reliably under load and are easy to operate. I love optimizing performance, tuning databases, and improving developer productivity through solid CI/CD, clear architecture, and close collaboration with product teams. Based in Tokyo, I partner with clients and teams worldwide to deliver robust software solutions on AWS and beyond.…I'm Kazuya Yoshimura, a backend-focused software engineer specializing in Golang and TypeScript. I design and build scalable backend services, API architectures, and cloud infrastructure that perform reliably under load and are easy to operate. I love optimizing performance, tuning databases, and improving developer productivity through solid CI/CD, clear architecture, and close collaboration with product teams. Based in Tokyo, I partner with clients and teams worldwide to deliver robust software solutions on AWS and beyond.

Available to hire

I’m Kazuya Yoshimura, a backend-focused software engineer specializing in Golang and TypeScript. I design and build scalable backend services, API architectures, and cloud infrastructure that perform reliably under load and are easy to operate.

I love optimizing performance, tuning databases, and improving developer productivity through solid CI/CD, clear architecture, and close collaboration with product teams. Based in Tokyo, I partner with clients and teams worldwide to deliver robust software solutions on AWS and beyond.

Skills

Experience Level

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Intermediate

Intermediate

Language

Aragonese

Advanced

Work Experience

Backend Software Engineer (Freelance) at Multiple Clients

July 1, 2024 - Present

Built push notification infrastructure using AWS SNS, SQS, ECS, Lambda, Step Functions, DynamoDB, and EventBridge. Led technology selection and initial architecture for a new frontend project. Performed SQL performance tuning using EXPLAIN and indexing strategies to reduce query times for datasets over 10,000 records. Executed zero-downtime database migrations using the Strangler Fig pattern. Set up CI/CD pipelines with GitHub Actions and automated linting to improve development workflow.

Full-Stack Engineer at Isaac Inc.

January 1, 2023 - June 1, 2024

Developed features for a dating app using React Native and NestJS. Integrated Adjust SDK to track user acquisition sources. Analyzed product metrics using Redash SQL. Improved team communication by introducing Gather for remote collaboration.

Full-Stack Engineer at READY TO FASHION Inc.

April 1, 2022 - December 1, 2022

Refactored legacy React class components into modern functional components. Improved search performance by investigating Elasticsearch integration. Introduced WebP image format to reduce page load times. Assisted designers with GitHub workflows and frontend code modifications.