Case Study / Seller Operations System
Sello — Seller Operations System
A lightweight, cloud-based Seller Operations System for Indonesian online sellers.
Category
Seller Operations System
Role
Product strategy, UI/UX design, full-stack development
Tools
Next.js, TypeScript, Tailwind CSS, Supabase
Year
2026
Project Type
SaaS Web App / Seller OS
Status
Personal Product / MVP
Product Screens
Core seller modules
Price Calculator
Guides sellers from product cost, marketplace fees, margin targets, and safe-profit checks into a cleaner selling price decision.
Products & Inventory
Keeps product records, stock status, low-stock signals, and bulk spreadsheet operations close to daily seller workflows.
QR Scanner
Supports quick stock activity from mobile so inventory updates can happen closer to packing, receiving, and warehouse moments.
Finance
Groups accounts, income, expenses, supplier debt, budgets, and reports into one finance view for operational clarity.
Project Overview
Overview
Sello was shaped as a lightweight cloud-based seller OS for Indonesian marketplace operators who need pricing, inventory, purchasing, finance, budgets, and reports in one web app instead of scattered spreadsheets and manual notes.
Problem
The field workflow gap
Online sellers often calculate marketplace prices separately from inventory and finance records. That split makes it harder to understand profit, stock risk, supplier debt, purchasing needs, and cash movement from one reliable workspace.
Role
What I handled
I defined the product direction, designed the app structure, wrote the interface copy, built the responsive web app, and connected multi-user seller workflows with Supabase, PostgreSQL, Row Level Security, and transactional backend logic.
Solution
A focused seller operating system
Sello combines a pricing calculator, product inventory, supplier and purchase workflows, QR-based stock activity, finance tracking, budgets, and reports inside a responsive sidebar-based app shell.
Key Features
Key modules
Design Approach
Mobile-first operational clarity
The design favors dense but calm operational screens: clear tables, compact cards, persistent navigation, plain Indonesian workflow copy, and responsive layouts that keep desktop planning and mobile stock tasks usable.
Design Decisions
Why the interface is structured this way
01
Sidebar-first navigation
Core seller modules stay visible so users can move between pricing, products, finance, and reports without losing context.
02
Operational density
Cards and tables show enough detail for repeated seller work while avoiding a decorative SaaS landing-page feel.
03
Cloud data boundaries
Supabase Row Level Security keeps seller data scoped to the right account while backend workflows protect critical operations.
04
Mobile stock moments
QR scanning and stock activity screens are optimized for handheld usage near packing and inventory tasks.
Tools
Tools & Technologies
Frontend
Backend / Data
Product & Design
Impact
Outcome
Sello turns fragmented seller operations into one product direction: pricing decisions, stock health, purchase planning, cash movement, budgets, and reports can be managed from a single workspace.
What I Learned
Reflection
Seller tools feel strongest when pricing, stock, and finance are connected around the operator's real daily decisions, not treated as separate dashboards.
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