Kooin Shin — Senior Full Stack Developer

💡 Profile

A seasoned Full Stack Developer with convoying a lot of experience specializing in backend, big data engineering, and cloud solutions. Skilled in React JS, React Native, Express.js, Java, JavaScript, Spring Boot, and cloud platforms like AWS and GCP.

Led the development of hybrid cloud-based DI/ETL systems, Kafka cluster deployments on Kubernetes, and scalable data lake architectures. Experienced in building both enterprise-grade data solutions and real-time mobile applications. Certified as a Sun Certified Java Programmer and AWS Cloud Practitioner, with additional experience in big data infrastructures (Talend, Kafka), microservices, CI/CD pipelines, and solution architecture.

Proficient in system integration for military battlefield simulations, real-time communication servers, and 2D visualization GUIs. Passionate about creating efficient, scalable systems and contributing to open-source communities (ChaosGraph, ChaosChart).

Highly adaptive, with advanced English and native Korean skills, and a strong interest in tech trends, world history, and environmental issues.

💻 Skills

Design and development of Express JS REST API server and batch servers
Design and development of React JS, React Native Web/App applications
Expertise in Java programming including SDK, Web, Framework, Network, Native, Algorithms, Data Structures, Profiling, and Native UX/UI
Strong knowledge of Java backend and partial frontend development (e.g., HTTP, HTTPS, RESTful APIs, REST Clients, Spring Boot, Web Crawling, React JS, JavaScript)
Experience in data integration platforms such as Kafka, RabbitMQ, ActiveMQ, and Talend (Qlik) for development, testing, debugging, and maintenance
Expertise in cloud and big data infrastructure including AWS, GCP, Azure, Cloudera, Hive, BigQuery, S3, Athena, Aurora, RDS, DynamoDB, Redshift, EC2, Lambda, CloudWatch, IAM
In-depth knowledge of storage platforms based on RDBMS, NoSQL, and DocumentDB (e.g., MySQL, PostgreSQL, MariaDB, Aurora, ElasticSearch, MongoDB, DynamoDB, S3, Athena, Redshift)
Experience handling data structures like JSON, YAML, Avro, Parquet, CSV, and NetCDF for parsing, formatting, converting, and integrating via file systems, networks, or cloud infrastructure
Professional knowledge of virtualization technologies such as Kubernetes and Docker
Expertise in native Android application development
Advanced skills in Java native and library development
Strong experience in Java 2D graphics development (e.g., 2D tables, 2D charts)
Specialist in Java native UI/UX design and development (e.g., SWT, JFace, Swing, RCP)
Comprehensive OS and software knowledge (e.g., Linux, Shell Scripting, Windows, Ubuntu, Fedora, Red Hat)

🧰 Work Experience

Innotree Corp. — Senior Full Stack Developer & Part Leader

Feb 2018 – Apr 2024

Led Kafka-based DI/ETL solutions in hybrid cloud environments (AWS + On-Prem).
Developed internal Talend components and data pipelines using Talend Open Studio.
Designed Data Lakes and migrated RDBMS to S3, BigQuery, and Redshift.
Set up Kafka clusters in Kubernetes using Docker.
Built scalable architectures and documented performance evaluations.

SICC Corp. — Application Developer

Jun 2004 – Oct 2015

Developed KCTC battlefield simulation systems for military training.
Built RS485/TCP communication modules and 2D visualization GUIs using Swing.
Enhanced communication servers for high-throughput message processing (>1500 TPS).
Designed chart dashboards with real-time monitoring using JMX.

📈 Featured Projects

📱 AroundUs Community App

Explore more details about the project: AroundUs Community App

Developed a mobile application to connect local communities, featuring real-time chat, event organization, and location-based services. Implemented a microservices architecture using Node.js and Docker, with CI/CD pipelines for seamless deployment. Utilized React Native for cross-platform mobile development, ensuring a smooth user experience on both iOS and Android. Designed a scalable backend system with RESTful APIs, enabling efficient data management and user interactions. Integrated third-party APIs for enhanced functionality, including maps, notifications, and social media sharing.

🔄 Kafka + Talend Integration

Built Kafka clusters on Kubernetes and developed Talend data pipelines for hybrid cloud environments. Implemented real-time data streaming and processing solutions, ensuring high availability and fault tolerance. Designed and optimized ETL processes for efficient data integration and transformation. Collaborated with cross-functional teams to gather requirements and deliver tailored solutions.

📊 ChaosGraph & ChaosChart

Developed open-source charting libraries for Java and JavaScript, supporting dynamic and interactive visualizations. Implemented various chart types, including line, bar, and pie charts, with customizable options. Contributed to the open-source community by providing documentation, examples, and support for users. Ensured cross-browser compatibility and performance optimization for smooth rendering of charts. Engaged with users to gather feedback and continuously improve the library features and usability.

🛒 Lotte E-commerce ETL

Designed and maintained ETL pipelines for large-scale e-commerce systems. Implemented data extraction, transformation, and loading processes to ensure data integrity and accuracy. Collaborated with data analysts and engineers to optimize data workflows and improve system performance. Utilized cloud services for data storage and processing, ensuring scalability and reliability. Monitored and troubleshot ETL processes to ensure timely data availability for business intelligence and reporting. Developed automated testing and validation processes to ensure data quality and consistency. Provided training and support to team members on ETL best practices and tools. Engaged with stakeholders to gather requirements and deliver tailored solutions. Implemented data governance and compliance measures to ensure data security and privacy. Utilized data visualization tools to present insights and trends from the ETL processes. Collaborated with cross-functional teams to gather requirements and deliver tailored solutions. Designed and implemented a scalable data lake architecture to handle large volumes of structured and unstructured data. Utilized cloud-based storage solutions such as AWS S3 and Azure Data Lake for cost-effective and secure data storage. Developed data ingestion pipelines using Kafka to ensure efficient and real-time data processing. Implemented data cataloging and metadata management tools to enhance data discoverability and governance. Optimized data retrieval and query performance using partitioning, indexing, and caching techniques. Provided training and documentation to teams on best practices for utilizing the data lake effectively.

🪖 KCTC Combat Simulation

Created battlefield simulation software with real-time tracking and visualization. Developed algorithms for simulating combat scenarios and troop movements. Implemented a user-friendly interface for military personnel to interact with the simulation. Collaborated with military experts to ensure the accuracy and realism of the simulation. Utilized advanced graphics and visualization techniques to enhance the user experience. Conducted extensive testing and validation to ensure the reliability and performance of the simulation. Provided training and support to military personnel on using the simulation software effectively. Engaged with stakeholders to gather feedback and continuously improve the simulation features and functionality. Implemented data analytics and reporting features to provide insights into combat systems.

👨‍💻 Kooin Shin — Senior Full Stack Developer

💡 Profile

📇 Contact

🌍 Languages

📜 Certification

🎓 Education