Software Engineer

Building AI-assisted products, automation workflows, and scalable web systems end to end.

Full-stack delivery with AI-assisted workflows

I build production web systems across product frontend, operations tooling, data flows, and delivery automation, with a focus on React, Next.js, TypeScript, and pragmatic backend integration.

My current direction is AI-assisted product delivery: using modern AI tools and workflow automation to move from product intent to reliable, maintainable systems faster without losing engineering discipline.

11
Years Experience
30+
Products Delivered
25+
AI-ready Stack

Skills & Technologies

Technologies I work with

  • OpenAI
  • Claude
  • Gemini
  • Python
  • FastAPI
  • React
  • Next.js
  • TypeScript
  • WebSocket
  • Jotai
  • Apollo GraphQL
  • Node.js
  • GraphQL
  • Supabase
  • PostgreSQL
  • MySQL
  • GitHub Actions
  • Docker
  • Vercel
  • Jenkins
  • Figma
  • Jira

Featured Projects

Naver Booking

Naver Booking

A comprehensive booking platform for managing reservations, customer data, and service offerings across high-traffic consumer flows. I worked on resilient frontend experiences that supported real-time booking decisions, merchant configuration, and dependable day-to-day operation.

ReactTypeScriptSCSSWebpackApollo GraphQLExpressAngular
Live
Naver SmartPlace

Naver SmartPlace

A smart solution for businesses to manage their online presence, customer reviews, and marketing campaigns effectively. The work focused on maintainable admin interfaces for complex business data, helping merchants update place information and operate customer touchpoints with less friction.

ReactNext.jsSCSSTypeScriptApollo GraphQL
Live
Flipster

Flipster

A high-performance crypto perpetuals trading platform engineered by traders and optimized for fast decision-making. I contributed to secure account flows, operational back-office surfaces, and responsive product interfaces that needed to stay clear under production pressure.

ReactNext.jsWebSocketPanda CSSTypeScript
Live

Experience

Glyn Labs

Founder

Duration
Dec 2025 - Present
Location
Seoul, Korea
  • Founded Glyn Labs, delivering AI-based branding, SEO, AEO, and GEO evaluation, improvement, and ongoing maintenance services.
  • Own the full client journey from brand identity definition through website production to the build and long-term maintenance of their web services.
  • Design and implement AI-driven audit pipelines that score a brand's search and generative-answer visibility, then turn the findings into actionable improvement plans.
  • Handle end-to-end product delivery as a solo full-stack engineer: frontend, backend, database design, deployment, and operations.
ReactTypeScriptNext.jsNode.jsPostgreSQLDocker

Flipster

Senior Software Engineer

Duration
Jan 2023 - Nov 2025 · 2 yrs 11 mos
Location
Seoul, Korea
  • Developed and maintained the web platform for the Flipster exchange, with primary ownership of Account and Operations features.
  • Implemented core user-level security functionalities, including Multi-Factor Authentication (MFA), Passkeys, and Anti-Phishing systems, significantly strengthening platform security.
  • Contributed to improving overall user experience (UX) by proposing and implementing usability enhancements that made the platform more intuitive and user-friendly.
  • Served as the sole developer responsible for the back-office system, owning end-to-end development and maintenance.
  • Led the migration of the back-office UI from SCSS-based styling to Ant Design (antd), optimizing design resources and accelerating development speed.
  • Designed and implemented the majority of core back-office features, supporting internal operations and administrative workflows.
  • Operated in a high-demand production environment, gaining strong experience in rapid issue resolution, hotfix deployment, and efficient system management.
ReactTypeScriptPythonNext.jsJotaiPanda CssAnt Design

NAVER Corp

Software Engineer

Duration
Dec 2018 - Jan 2023 · 4 yrs 2 mos
Location
Seongnam, Korea
  • Owned the development of consumer-facing interfaces for NAVER Reservation, a large-scale service operating under continuous, real-time user traffic.
  • Engineered frontend systems capable of handling always-on reservation flows, with a strong focus on responsiveness, fault tolerance, and operational stability.
  • Drove an early-stage frontend stack transformation, migrating the codebase from Angular to React to improve scalability and long-term maintainability.
  • Pioneered the adoption of Apollo GraphQL (2019) within the project, redesigning data access patterns to reduce coupling and improve performance.
  • Played a key role in evolving the frontend architecture through ongoing refactoring and performance-oriented improvements.
  • Initiated and delivered NAVER Order, a reservation-related sub-service, from inception to production launch.
  • Defined a minimum viable feature set under aggressive timelines and executed a phased rollout strategy to balance delivery speed with service stability.
  • Actively participated in product planning and UX decision-making, collaborating closely with designers and planners beyond a pure implementation role.
  • Contributed to Smart Place, the merchant-facing admin platform for NAVER Place.
  • Re-architected complex, form-heavy interfaces used to manage business data, improving structural clarity and long-term maintainability.
  • Emphasized consistency, reusability, and developer ergonomics when building internal-facing UI components.
ReactTypeScriptApollo GraphQLReduxJotaiAngular

N Tech Service

Software Engineer

Duration
Jul 2016 - Dec 2018 · 2 yrs 6 mos
Location
Seongnam, Korea
  • Led frontend development for NAVER's core services including the Advertising Platform and Developer Center.
  • Architected and maintained PaaS infrastructure supporting NAVER's service ecosystem.
  • Developed and maintained internal developer tools and shared libraries to improve team productivity.
  • Built QA testing tools for LINE Games, streamlining the quality assurance workflow.
ReactTypeScriptJavaScriptVue.jsSCSSjQueryElectron

Get In Touch

AI-assisted product, automation, and full-stack delivery

I am open to conversations about AI-assisted product work, automation workflows, and full-stack systems that need reliable delivery.

Email

fed.xyfy@gmail.com

Location

Seoul, Korea

GitHub

@thisusernameissolongicantevenrememberit

LinkedIn

Connect with me