Service Foundry
Blog Infra SSO Observability Backend Big Data
Young Gyu Kim

  20 https://linkedin.com/in/credemol

20 Vancouver, Canada

20 credemol@gmail.com

About me

I am dedicated to developing robust Kubernetes-native solutions, encompassing Java applications, comprehensive observability frameworks, scalable big data engineering platforms, and secure single sign-on (SSO) systems.

Work History

2025 Mar ~ Present

Individual Software Developer(Vancouver, Canada)
Developing Kubernetes-native solution named Service Foundry

2018 Sep ~ 2025 Feb

iClinic Systems(Vancouver, Canada) - Solution Architect
Solution Architect, Observability Engineer, Backend Developer (Java, Kotlin, Node.js), Big Data Engineer, Flutter Developer, Kubernetes Application Developer.

2012 Mar to 2018 Aug

Oracle(Seoul, Korea) - Principal pre-sales consultant
Specialized in Java and served as a Technical Consultant for Oracle Middleware and Cloud Platform Line of Business (LOB).

2004 Sep to 2012 Feb

Archnal Systems(Seoul, Korea) - Senior developer
Designed and developed enterprise IT solutions as a Software Architect and Java Developer.
Contributed to projects for major organizations, including Samsung Electronics, Hana Bank, Korea Telecom (KT), SK C&C, and the Korean Federation of Community Credit (KFCC).

2002 Apr to 2004 Aug

Koreadotcom(Seoul, Korea) - Lead developer
Developed and implemented a high-performance Message Broker solution using Java.

2001 Jan to 2002 Mar

Cypro(Seoul, Korea) - Software developer
Developed an online lottery system as a Java Developer.

1999 Mar to 2000 Dec

ReadySoft(Seoul, Korea) - Software developer
Designed and implemented a Content Management System (CMS) as a Java Developer.

Academic Record

1995–1999

Jeonbuk National University, Bachelor of Computer Science. Jeonju, Republic of Korea. Grade: 4.14 / 4.5

Articles

IT Skills

Backend Development & Architecture

  • Language & Frameworks: Java, Kotlin, Spring Framework, Node.js, Scala

  • Messaging & Caching: Apache Kafka, RabbitMQ, Redis, Hazelcast

  • Microservices & API Management: Spring Cloud Gateway, Spring Cloud Config Watcher, Service Registry & Discovery(Zuul, Consul, Eureka), Netlix OSS

Cloud & Kubernetes

  • Cloud Platforms: Azure, AWS

  • Kubernetes & Containerization: Kubernetes Cluster(AKS, EKS), Container Registry(ACR, ECR), Helm, Kubernetes Gateway, Containerized Applications

Observability & Monitoring

  • Observability Frameworks: OpenTelemetry(OpenTelemetry Collector, OpenTelemetry Instrumentation, OpenTelemetry Target Allocator), OpenTelemetry Protocol(OTLP), OpenTelemetry Operator

  • Logging & Tracing: Centralized Logging, Distributed Tracing, Fluent Bit, ELK Stack, OpenSearch Stack, Zipkin, Jaeger

  • Metrics & Visualization: Prometheus, Grafana

  • Storage & Persistence: Apache Cassandra

  • Logs and Traces Analysis: Apache Spark, Apache Airflow, Neo4j, Cassandra, OpenSearch, DuckDB, Sling

Big Data Engineering

  • Orchestration & Processing: Apache Airflow, Apache Spark, Kafka Connect, Structured Streaming, Batch Processing

  • Database & Storage: Neo4J, DuckDB, Cloud Storage for HDFS

  • Schema & Metadata Management: Kafka Schema Registry

High Availability & Scalability

  • Clustered Databases: PostgreSQL, MongoDB, Elasticsearch

  • Clustered Middleware: Kafka, RabbitMQ, Redis, Hazelcast

  • Load Balancing & Fault Tolerance: API Gateway, Consul, Zuul

Frontend Development

  • Technologies: React, Flutter(iOS, Android, Web, Tablets, Desktop)

  • Backend as a Service: Firebase

DevOps & CI/CD

  • Tools & Platforms: Azure DevOps, Jenkins, Bitbucket, Git, GitHub

  • Artifact Management: Artifactory, Nexus

  • Build & Dependency Management: Gradle, Maven, SBT

  • Containerization & Orchestration: Docker, Kubernetes, Helm

  • Project Management & Collaboration: Jira, Confluence

Databases & Storage

  • Relation Databases: PostgreSQL, MySQL, Oracle

  • NoSQL & Search Engines: MongoDB, ElasticSearch, OpenSearch, Neo4j, Apache Cassandra

  • In-Memory Databases & Caching: Redis, Hazelcast

Healthcare

  • FHIR: Familiar with FHIR standards and HAPI FHIR for healthcare data integration.

  • HL7 V2: Familiar with HL7 V2 standards and message formats.

  • FHIR Composer with HAPI JPA Server: Developed a FHIR-compliant data integration system using HAPI FHIR.

  • Integration with PHSA eForms App: Integrated iClinic’s EMR with PHSA’s eForms system using HAPI FHIR model objects and REST API.

  • HL7 Message Parser: Developed a parser for HL7 V2 messages using Java and Spring Framework.

Work Experiences

Individual Software Developer (2025 March to Present)

Main Roles

  • Kubernetes Application Developer

Key Projects & Contributions

  1. Service Foundry - Developed a Kubernetes-native solution for building and managing cloud-native applications.

    • Built automated infrastructure provisioning using Kubernetes(EKS, AKS), Helm, Yeoman, and Terraform

    • Integrated OpenTelemetry, Prometheus, Grafana, Jaeger, Fluent Bit, Apache Cassandra, and ELK/OpenSearch Stack for comprehensive observability

    • Single Sign On(SSO) integration using Keycloak, Traefik, and OpenID Connect

    • Utilized Java, Spring Framework for backend services

    • Big Data engineering using Apache Spark, Apache Kafka, Apache Airflow, Neo4j, DuckDB, Sling

iClinic Systems (2018 September to 2025 February)

Main Roles

  • Solution Architect

  • Software Developer (Java, Spring Framework, Kotlin, Python, Javascript, Scala, Flutter)

  • Kubernetes Engineer & DevOps Engineer

  • Observability Engineer (OpenTelemetry, Prometheus, Grafana, Jaeger, Zipkin, Fluent bit, ELK stack, OpenSeearch stack, Apache Cassandra)

  • Big Data Engineer (Airflow, Apache Spark, Apache Kafka, Kafka Connect, Neo4j, DuckDB, Sling)

Key Projects & Contributions

  1. Healthcare Data Analytics on Kubernetes - Developed a scalable data analytics platform to efficiently process and analyze healthcare data on Azure Kubernetes Service (AKS).

    • Big Data Processing: Utilized Apache Spark (Scala, PySpark), Apache Kafka, Apache Airflow, and Neo4j to handle large-scale healthcare data.

    • Real-Time Streaming: Enabled real-time data processing with Spring Cloud Stream (Kafka) and Apache Spark Structured Streaming.

    • Schema Management: Integrated Kafka Schema Registry for efficient schema evolution and governance.

    • Data Migration: Implemented real-time data migration using Kafka Connect.

    • Optimized Querying: Integrated DuckDB and Sling for high-performance data queries.

    • Cloud-Native Deployment: Deployed the solution on Azure Kubernetes Service (AKS) with Azure Blob Filesystem (ABFS) for scalable storage.

  2. EMR Application Modernization - Phase 1 - Revamped the legacy EMR application to improve reliability and performance.

    • Implemented a Spring-based microservices architecture using Consul, Zuul, RabbitMQ, Redis, and WebSockets

    • Frontend update from Flash to Angular for improved user experience

    • Deployed on Azure, utilizing Jenkins and Artifactory for CI/CD

  3. EMR Application Modernization - Phase 2 - Led the second phase of modernizing the EMR application to enhance scalability and performance.

    • Designed a microservices-based architecture with Spring Cloud Gateway, Redis, RabbitMQ, Hazelcast, and Zipkin

    • Migrated from a 4D database to PostgreSQL, improving scalability

    • Integrated Elasticsearch and PostgreSQL for efficient search and storage

    • Managed deployment on Azure Kubernetes Service (AKS) with CI/CD automation using BitBucket Pipeline, Jenkins, and Artifactory

  4. FHIR Composer with HAPI JPA Server - Developed a FHIR-compliant data integration system to standardize medical data exchange.

    • used HAPI FHIR Model Object and Parser for data transformation

    • Built an HAPI JPA Server and integrated it with Spring Framework for seamless data management

  5. FHIR Composer – Integration with PHSA(Provincial Health Services Authority) eForms App - Enabled interoperability between iClinic’s EMR and PHSA’s eForms system.

    • Integrated HAPI FHIR REST API with RabbitMQ and OAuth for secure communication

    • Developed API interactions between PHSA eForms App and iClinic’s systems

  6. Two-Factor Authentication with ACL Rules - Implemented a secure authentication mechanism with role-based access control.

    • Developed TOTP/HOTP-based 2FA authentication using Microsoft Authenticator and Google Authenticator

    • Integrated with Spring Security to enforce access control policies

  7. Big Data Engineering on Kubernetes - Designed and implemented a scalable data engineering platform for healthcare analytics.

    • Developed data engineering workflows using Apache Spark, Apache Airflow, and Neo4j

Oracle Korea (2012 - 2018)

Main Roles

Principal Pre-sales consultant in Middleware LOB, Java specialist.

Specialized In

Java, Java EE, Spring Framework, Oracle WebLogic, Oracle Service Bus, Oracle SOA, Oracle PaaS including JCS(WebLogic), ACCS(Application Container), MCS(Mobile), DevCS(Developer), ICS(Integration), SOACS(SOA), APIPCS(API Platform), DocCS(Document), OCCS(Docker Container)

IT Honors & Awards

  • FY18 Q2 Sales Culture Transformation

  • FY17 Q2 APAC Middleware Top Performer

  • FY17 Q1 APAC Middleware Top Performer

  • FY17 Q1 Cloud Transformer Award in Korea

  • FY16 Q3 APAC Middleware Top Performer

  • FY16 Q3 Middleware Best Sales Consultant Award in Korea

Customer Success Stories

Doosan Heavy Industry & Construction - Mobilize Workforce with Oracle(Customer Success Story. Awards)

Java, Spring Boot, MCS, MAF, Node.js, Oracle JET, Oracle SOA

Samsung Medical Center(SMC) Research Center - Next Generation project with ACCS & DBCS(Awards)

Java, Spring Boot, ACCS, DBCS, Oracle Developer Cloud

Archnal Systems(2004 - 2012)

Main Roles

Software architect, Senior Java developer.

Samsung Electronics(Mobile LOB) - Admin Portal for ChatOn, SPP(Samsung Push Platform), and SocialHub

Spring MVC framework, myBatis, Java, MySQL, jQuery, WebLogic

Hana Bank - Multi Channel Architecture(MCA) Project

Oracle Service Bus(OSB), WebLogic, Java, Spring Framework, Hibernate, Eclipse plug-in, Oracle 10g

Korea Telecom(KT) - Mobile E-Government Project

Java, MM7, Struts, myBatis, CXF, Tomcat

Samsung Electronics(Network LOB) - KDDI 1.2G OMC-T Project

WebNMS, SNMP, Java, Swing

SK C&C - Metaverse EProject

Spring Framework, CXF, Java, jQuery, Oracle 10g, JBoss

Korean Federation of Community Credit(KFCC) - Banking Data Integration Project

Spring MVC Framework, Java, Oracle 10g

Korea dot com (2002 - 2004)

Message Broker

Java, Java EE(Servlet, JSP, JMS), Swing, XML

Cypro (2001 - 2002)

Online Instant Lottery System

Java, Java EE(Servlet, JSP, JMS), Applet

Ready Soft (1999 - 2000)

ReadyWeb

Java, Java EE(Servlet, JSP, JMS), Tomcat