Portfolio — Gyu-hun Im · Full-stack / Product EngineerMeerkat Studio · 2025 — 2026

Observe,Build,Operate.

A portfolio of products I took from planning through deployment and operation, together with the engineering decisions behind them.

Every project is a solo build unless collaboration is explicitly noted.

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Name: Gyu-hun Im
Role: Full-stack / Product Engineer
Team: Solo developer
Since: 2025.06

Node.jssystemdsystemctljournalctlnpm CLITypeScriptYAMLCodex/HermesNext.jsPrismaPostgreSQLAuth.jsPostHogOpenAI APIREST APIAndroid IntegrationDiscord APIRedis

7Operating products

5Live web services

2npm packages

2025.06Operating since the first release

Developer evidence · 01—03

Three featured engineering cases

The constraints, chosen solutions, and operating results across three different problem spaces.

Next.jsTypeScriptPrismaPostgreSQLAuth.jsPostHog

Frontend · UGC · AnalyticsLive

AskAITo

A UGC flow from content discovery to prompt copy

2026.06 – Operating nowSolo developerPlanning · design · development · deployment · operations, 100%

Owned scopeInformation architecture, responsive UI, authentication, content data model, image upload, and PostHog conversion events

Hardest problem

If prompts and result images save only partially, both reproducibility and trust in the content break down.

Chosen solution

The server boundary re-checks the minimum of two result images, while prompt, image, vote, comment, and report domains stay separate. Copy after social acquisition is the primary conversion event.

Rejected alternative

Accept a post after client-only validation. It was rejected because request tampering and partial persistence would remain possible.

Operating result

Observed snapshot on a featured post: 183 views and 103 copies. The public service is producing real discovery and copy behavior.

Read the engineering case Open AskAITo

Node.jsTypeScriptDiscord APIRedisPostgreSQL

Backend · Data · OperationsLive

Meerkat

One operating flow across bot, API, analytics GUI, and docs

2025.06 – Operating nowSolo developerPlanning · design · development · deployment · operations, 100%

Owned scopeDiscord bot runtime, API server, Redis and PostgreSQL data layer, analytics dashboard, docs, and VPS operations

Hardest problem

Real-time Discord events had to become useful operating metrics without letting missing voice records or stale data erode the dataset.

Chosen solution

The bot runtime and operations GUI have separate responsibilities joined by shared data contracts. Post-launch work added recurring data cleanup and stronger voice-session recording.

Rejected alternative

Keep aggregation and operator UI responsibilities inside the bot process. It was rejected to limit failure scope and deployment coupling.

Operating result

Operating since June 2025, with shipped improvements for data cleanup, voice-record completeness, dashboard accessibility, and localization recorded in the Ship Log.

Read the engineering case Open analytics dashboard

Node.jsTypeScriptYAMLnpm CLICodex/Hermes

CLI · Policy Model · TestsLive

SkillBoard

A policy CLI that separates installed skills from skills allowed now

2026.07 – Operating nowSolo developerPlanning · design · development · deployment · operations, 100%

Owned scopeCLI information architecture, YAML policy model, workflow routing, pre-use guard, action cards, cleanup, migration, and documentation

Hardest problem

As skill inventory grows, a raw list confuses installed with currently allowed and turns policy changes into a repeated manual checklist.

Chosen solution

Inventory and allowed state are separate. Brief, route, and guard form the read path, while policy changes become explicit, approvable action cards.

Rejected alternative

Rewrite SKILL.md files per agent or expose only the installed list. It was rejected because provenance and workflow policy would be lost.

Operating result

Repository snapshot at review: 49 commits and 8 version tags, with tests, examples, changelog, and npm distribution maintained together.

Read the engineering case Open GitHub repository

Index · 04—07

Other operating products

More operating services and installable packages beyond the featured cases.

Hover a row to preview the product screen

my-systemdLive

A tiny CLI for finding and grouping the systemd services you created.

2026.07 – nowNode.js · systemd · systemctl

Live

KamoLive

A content ops SaaS that turns one product update into multi-channel content packs.

2026.04 – nowNext.js · TypeScript · Prisma

Live

PluidLive

An AI note app that carries rough capture into summary and next action.

2026.02 – nowNext.js · TypeScript · REST API

Live

brieFFlowLive

An AI workspace for producing press releases and career documents faster.

The document workflow that began as PressTuner has grown into the brieFFlow AI workspace.

2025.12 – nowNext.js · OpenAI API · PostgreSQL

Live

Professional Work

Professional team projects

Outside the operating products, I have worked as part of a team. These are the main professional projects. See details on the developer docs

2024

Korea Expressway Project

Team project

Built CRUD features on a hexagonal-architecture codebase, experienced the benefits of layered responsibility design, and kept studying clean architecture from there.

JavaSpring

2024

KMA Road Weather Project

Team project

Separated markup from script logic while respecting the existing code style, and applied React's component approach to a JSP environment to improve reuse and maintainability.

JSPJavaScriptReact

2023

KICT Underground Information Center (Web)

3-person team

Maintained and extended a public-sector web service — building education and management features and adding a visual activity-statistics dashboard to the admin page.

JavaSpringJSPPostgreSQL

Contact

Looking for a team to build the next one with

Roles, collaboration, or product talk — one email is enough to start.

meerkatstudio.dev@gmail.com

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