[portfolio](https://geonwoo.kim/en/portfolio) › Lukuku

# space-l · client OS

https://geonwoo.kim/en/portfolio/lukuku-space-l

Period: 2026.10 — Present

Progress previously shared through separate documents and messages now lives in one place. I built the server and deployment pipeline.

Advertising performance and daily sales across 3 overseas markets on one screen

Team: 4 people · Server development and shared frontend work

Role: Architecture · Go API server · Deployment pipeline

Next.js · TypeScript · Go · Vercel · AWS EKS · AWS S3

- Client login with an ID and password, staff login through Slack
- Local currency amounts shown with KRW reference amounts
- Schedule timeline and shared materials
- Internal CRM and inbound inquiries

## Client data and internal data

Problem: Client views and internal CRM needed to share an app while keeping each client's data separate.

Solution: Next.js handles the interface while the Go API server handles authentication, DB, files and email. Client staff see only their own company's workspace. Files are isolated in per-client storage with credentials that can reach only that storage.

## Branches piling up per client

Problem: Writing each client's requirements straight into the code would add another branch with every new client.

Solution: Split the server into shared features and per-client work modules. Data is organized in a hierarchy of client, brand, project or campaign, then task, and a rule blocks client-specific hard-coding. The server work is split into shared features and 11 work modules.

## Screen changes that needed a developer

Problem: PMs had to ask developers to merge and deploy every screen change.

Solution: An internal deployment service checks branches every 2 minutes and deploys after validation. A PM's label triggers a merge only for PRs that pass checks. PMs can apply screen changes without developer help, and deployment tokens were removed from repositories.


[Shopify B2B store for a US subsidiary · B2B backend](https://geonwoo.kim/en/portfolio/lukuku-commerce-b2b)