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Eunseok Kang

@eunseokkang

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Versatile full-stack engineer and tech lead with 10+ years building scalable production systems.

South Korea

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What I'm looking for

I seek senior engineering or tech lead roles where I can design distributed systems, lead teams, improve CI/CD, and drive cloud migrations in fast-paced environments.

I am a results-driven full-stack engineer and tech lead with over a decade of experience delivering scalable, production-grade systems across backend (Java, Go, Kotlin) and frontend (React, TypeScript). I have led migrations to cloud and Kubernetes, designed distributed architectures, and optimized CI/CD pipelines to improve deployment velocity and reliability.

My work includes designing company-wide authentication and OTP systems, building large-scale microservices and data-sync platforms, and reducing operational costs through caching and architectural redesigns. I mentor engineers, introduce Agile practices, and focus on shipping high-quality software quickly in fast-moving environments.

Experience

Work history, roles, and key accomplishments

Current

Senior Software Engineer

Current

Raisin

Jan 2021 - Present (5 years 5 months)

Designed and implemented company-wide authentication and OTP systems, migrated on-prem Java applications to AWS/Kubernetes, and optimized CI pipelines, improving build performance by ~40% and delivering multiple production-grade integrations.

Java Spring Boot Keycloak Kafka AWS Kubernetes React Terraform

Senior Software Engineer

Banksalad

May 2022 - Aug 2025 (3 years 3 months)

Led a 3-person engineering team and tech initiatives that cut external API costs by 20%, increased connection success by 20%, and migrated core systems to cloud-native architectures to boost resilience and scalability.

Go Kotlin gRPC MySQL Kafka Redis AWS Kubernetes GitHub Actions)GitHub Actions

Software Engineer

Facebook

Oct 2019 - Dec 2020 (1 year 2 months)

Built automated test failure analysis and E2E automation pipelines, enhancing testing velocity and debugging efficiency across internal applications using TypeScript, Jest, and backend tooling.

TypeScript Jest React Python Test Automation CI CD

Software Engineer

Gojek

Nov 2018 - Oct 2019 (11 months)

Developed a financial platform and high-throughput data distribution systems, established CI/CD for AWS/Kubernetes, and implemented logging/monitoring to improve operational reliability.

Java Go Spring Kafka PostgreSQL Helm Terraform Gitlab CI

Software Engineer

Rakuten

Apr 2017 - Sep 2018 (1 year 5 months)

Built travel itinerary systems and integrations for a major booking platform, implemented CI/CD pipelines, and improved QA processes with test data tools to streamline deployments.

Java Spring MongoDB PostgreSQL Cloud Foundry Jenkins React CI CD

Software Engineer

Inspace

Mar 2016 - Feb 2017 (11 months)

Improved Cordova app load performance and developed satellite image monitoring and radiation calculation systems using a mix of .NET, Java, Python, and SQL Server technologies.

ASP.NET C++Java Python SQL Server Cordova WPF Spring

Founder / Fullstack Engineer

KISG

Mar 2015 - Feb 2016 (11 months)

Founded and built an event-booking web and cross-platform mobile application using Laravel, React, React Native, and TypeScript, delivering end-to-end product and platform capabilities.

PHP Laravel React React Native TypeScript Redux Mobile Development Fullstack Development