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I'm a Full-Stack Software Engineer with 5+ years of experience designing and implementing RESTful APIs using Java (Spring Boot), Node.js, and TypeScript, while building scalable frontend applications with React. I thrive delivering end-to-end software solutions from architecture design through deployment and production operations on AWS, with strong focus on scalable system design and robust database schemas. I enjoy collaborating across teams to design clean architectures, ship reliable features, and maintain high standards for performance and quality in both backend services and frontend experiences.…I'm a Full-Stack Software Engineer with 5+ years of experience designing and implementing RESTful APIs using Java (Spring Boot), Node.js, and TypeScript, while building scalable frontend applications with React. I thrive delivering end-to-end software solutions from architecture design through deployment and production operations on AWS, with strong focus on scalable system design and robust database schemas. I enjoy collaborating across teams to design clean architectures, ship reliable features, and maintain high standards for performance and quality in both backend services and frontend experiences.

Jack Jung

Full Stack Developer, Back-End Developer, Web Developer, +3

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I'm a Full-Stack Software Engineer with 5+ years of experience designing and implementing RESTful APIs using Java (Spring Boot), Node.js, and TypeScript, while building scalable frontend applications with React. I thrive delivering end-to-end software solutions from architecture design through deployment and production operations on AWS, with strong focus on scalable system design and robust database schemas. I enjoy collaborating across teams to design clean architectures, ship reliable features, and maintain high standards for performance and quality in both backend services and frontend experiences.…I'm a Full-Stack Software Engineer with 5+ years of experience designing and implementing RESTful APIs using Java (Spring Boot), Node.js, and TypeScript, while building scalable frontend applications with React. I thrive delivering end-to-end software solutions from architecture design through deployment and production operations on AWS, with strong focus on scalable system design and robust database schemas. I enjoy collaborating across teams to design clean architectures, ship reliable features, and maintain high standards for performance and quality in both backend services and frontend experiences.

Available to hire

I’m a Full-Stack Software Engineer with 5+ years of experience designing and implementing RESTful APIs using Java (Spring Boot), Node.js, and TypeScript, while building scalable frontend applications with React. I thrive delivering end-to-end software solutions from architecture design through deployment and production operations on AWS, with strong focus on scalable system design and robust database schemas.

I enjoy collaborating across teams to design clean architectures, ship reliable features, and maintain high standards for performance and quality in both backend services and frontend experiences.

Skills

Experience Level

Expert

Expert

Expert

Expert

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Expert

Language

Korean

Advanced

English

Advanced

Work Experience

Full-Stack Developer at Itoxi

October 1, 2023 - December 1, 2025

At Itoxi, I provided 100% backend ownership across multiple projects, designing and implementing APIs, infrastructure, and database schemas using Java (Spring Boot) and contributing to frontend work with React. Projects included Petnuri Pet Platform and Inflinker Global, where I built scalable backend services and designed data models, while maintaining significant frontend collaboration (80% contribution). I also worked on LionsCrew with Node.js (Express.js) and TypeScript, delivering API design, infrastructure, and frontend features with React.

Back-End Developer at RS Interactive

August 1, 2022 - August 1, 2023

Developed backend services using Node.js (Express.js) and TypeScript, deploying containerized services on AWS (ECS, ECR) with Docker, Nginx, and Cloudflare. Built CI/CD pipelines for automated deployment and maintained 100% backend ownership. Worked on CONAZ Remicon Platform, designing backend architecture, APIs, and infrastructure, deploying services on Naver Cloud Platform using Docker and Nginx.

Full-Stack Developer at Chain Labs IT

March 1, 2022 - July 1, 2022

Led backend development for NIP-NFT Web (Node.js/Express.js, API design for auction systems) and contributed to frontend development with React (70% frontend contribution). Also implemented NFT transaction features for AK Friends NFT Web with React.

Front-End Developer at The Build Soft

June 1, 2021 - January 1, 2022

Delivered user-facing features for GongSero Client Web using React (60% frontend contribution) and developed Zero Waste App as a React Native mobile application (100% frontend contribution).

Full-Stack Software Engineer at ltoxi

October 1, 2023 - December 1, 2025

Led end-to-end development of PETNURI, an AI-powered pet health and e-commerce platform, using Java (Spring Boot), Node.js, and TypeScript. Built and maintained web-facing apps and an admin CMS with React and TypeScript to support high-traffic commerce, while contributing to frontend architecture and maintainability. Designed RESTful APIs and engineered scalable event-driven backend services with Apache Kafka to handle high-volume API requests, real-time transactions, payments, and order workflows.

Software Engineer at Cursor RS Interactive

August 1, 2022 - August 1, 2023

Built NURIDA, a hotel management and groupware platform, using Java (Spring Boot), Node.js, and TypeScript. Designed RESTful APIs and implemented real-time chat features via WebSocket with Redis Pub/Sub, enabling scalable internal messaging and collaboration.

Full-Stack Engineer at Chain Labs IT

March 1, 2022 - July 1, 2022

Designed and implemented RESTful backend APIs using Node.js to enable secure, scalable service integration. Supported file upload/storage workflows with Amazon S3 and developed frontend components using React for internal dashboards, integrating with MetaMask for NFT-related workflows.

Full-Stack Engineer at The Build Soft

March 1, 2021 - January 1, 2022

Developed and deployed CMS platforms and cross-platform mobile applications using JavaScript, HTML, CSS, React, React Native, and Redux. Managed app store releases and production operations, ensuring reliability and timely updates across platforms.