Hi, I'm Heyjin

Design-minded software engineer. I build products end to end.

Experience

Independent Software Engineer

Independent

2023 – Present•New York

Guided contracted engineers through design and code reviews, and shipped independent web projects, including a personal operating system run with AI agents under human approval.

Skills & Technologies
Cloudflare WorkersNext.jsTypeScriptPostgreSQLAI-Assisted DevelopmentTechnical ConsultingServerless ArchitectureCode Review

Senior Frontend Engineer II

Conductor

Mar 2019 – Dec 2022•New York

Led frontend architecture initiatives and delivered product features while serving on the UX component architecture council.

Skills & Technologies
React.jsJavaScriptTypeScriptStorybookFrontend ArchitectureUI ComponentsCross-functional CollaborationTechnical LeadershipResponsive Design

Senior Software Engineer (founding engineer)

SimpleReach

Oct 2012 – Mar 2019•New York

Built and evolved the company's core analytics product from initial concept to mature SPA platform, focusing on data visualization and frontend architecture.

Skills & Technologies
Ember.jsD3.jsRuby on RailsJavaScriptData VisualizationFull-Stack DevelopmentSingle Page ApplicationsTechnical CommunicationFrontend Architecture

Projects

Independent

Personal AI Operating System

A second-brain pipeline that turns Telegram captures (D1) into notes and weekly focus, with AI agents under human approval

Telegram BotCloudflare WorkersD1CronGitHub APIAI Agents
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2026 – Present
Conductor

Storybook Component Library

Component library and documentation for frontend engineers and designers

StorybookComponent LibraryDocumentationCollaboration
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2019 – 2022
Conductor

SEO Services Marketplace

Marketplace platform for SEO expert service discovery and management

ReactTypeScriptMarketplaceSEO Services
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2019 – 2022
Conductor

Content Briefs

Content creation workflow tool for SEO-optimized content production

ReactTypeScriptWorkflow DesignContent Management & Strategy
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2019 – 2022
Conductor

Actions Panel

Task management tool for SEO-related projects and action items, globally accessible throughout the app

ReactTypeScriptFormsGlobal PanelTask Management
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2019 – 2022
SimpleReach

Realtime Analytics Dashboard

Interactive data visualization dashboard showing real-time content performance

D3.jsEmber.jsData VisualizationReal-time Analytics
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2012 – 2019
SimpleReach

Historical Reports

Visual analytics platform for historical content performance data

D3.jsEmber.jsData VisualizationReusable Components
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2012 – 2019
SimpleReach

Social Engagement Analytics

Visual analytics for hourly engagement across social platforms and top-performing content

D3.jsEmber.jsData VisualizationReusable Components
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2012 – 2019
SimpleReach

Native Advertising Dashboard

A collaborative project between SimpleReach and Sharethrough for Native Advertising Summit

Ember.jsFrontend DevelopmentAPI IntegrationCollaboration Project
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2012 – 2019