# SellerOS: Case Study | Gr8r Studio

> SellerOS: one clear workspace for marketplace sellers. Sales, stock, shipments and profit across every marketplace in one place, with an AI briefing that says what needs attention today.

Source: https://gr8rstudio.com/work/selleros

# SellerOS: one clear workspace for marketplace sellers.

Sales, stock, shipments and profit across every marketplace in one place, with an AI briefing that says what needs attention today.

Built by Gr8r for its own portfolio. Not client work.

Client

SellerOS

Project

Commerce operations platform

Platforms

Web app, desktop and mobile

- [Product Design](https://gr8rstudio.com/services/product-design)
- [Product Engineering](https://gr8rstudio.com/services/product-engineering)

[View live demo](https://selleros-xi.vercel.app/)[Discuss your product](https://gr8rstudio.com/contact)

The problem

## Make busy operations easier to navigate.

A seller running several marketplaces watches sales, stock, inbound shipments, ads and margins, usually in separate tools. Stockouts, delays and margin changes are easy to miss until they cost money. The product had to show what needs attention first, and explain why.

- 1
### Problems surface too late
Stockouts, delays and margin changes show up in a report after they have already cost money.
“What should I fix first today?”
- 2
### The data lives apart
Sales, stock, inbound shipments and ad spend sit in different marketplaces and spreadsheets, so one decision means many tabs.
“Where do I even look?”
- 3
### Decisions need evidence
Reordering or moving stock is a money decision. Without the numbers behind it, it is a guess.
“How much should I reorder, and why?”

Where the day starts: a briefing of today's numbers and the 14 issues worth a look.

Each alert shows its evidence and how it was worked out, with the next action beside it.

Problem map

## Six themes behind the product.

Before designing screens, we grouped the problems a marketplace seller faces into themes, and gave each one a home in the product.

- ### Stock

  - Stockouts noticed too late
  - Reorder size is guesswork
  - FBA and warehouse stock split
- ### Shipments

  - Delays found by surprise
  - No link from a delay to stock risk
  - Inbound units hard to follow
- ### Profit

  - Margin changes go unseen
  - Ad spend against profit unclear
  - Fees differ by marketplace
- ### Daily work

  - Too many tabs to check
  - No single place to start
  - Tasks live away from the data
- ### Trust in AI

  - Why was this flagged?
  - Which data was used?
  - Who makes the call?
- ### Team

  - Who owns this SKU?
  - Follow-ups get lost
  - Handoffs happen in chat

Design hypotheses we built the product around, drawn from the product brief. Not interview data.

Information architecture

## Fifteen areas, grouped by the job.

The sidebar groups the product by what the seller is doing, in the same order as the app.

SellerOS

1. Start

  - Overview
  - Sales
  - Products
2. Stock & supply

  - Inventory
  - Shipments
  - Purchase Orders
  - Suppliers
3. Money & planning

  - Profitability
  - Advertising
  - Forecasting
  - Reports
4. AI

  - AI Assistant: Ask, Alerts, Briefing, Automations
5. Team & setup

  - Tasks
  - Integrations
  - Settings

The workflow

## One clear path from alert to action.

1. 1
Briefing
See today's numbers and what needs attention.
2. 2
Review
Open an alert and check the evidence behind it.
3. 3
Act
Create a PO or transfer stock straight from the alert.
4. 4
Follow up
Track it as a task and through the shipment.

The product

## Built around the work, not the screens.

Four parts of the interface carry most of the day. Each keeps the overview calm and puts the detail one step away.

1. Inventory
### Items that need your input
Stock problems arrive as a short list, each with the action that fixes it: create a PO or transfer to FBA.

  1. 1Stock problems arrive as a short list
  2. 2The fix sits on the row: Create PO or Transfer to FBA
  3. 3Low stock and the value at risk, up top
  4. 4Stock status by band, from out of stock to dead stock
2. Details
### Everything about one product
Revenue, margin, stock and the projected stockout date on one page, with the reorder already worked out.

  1. 1SKU, ASIN and marketplaces under the name
  2. 2Revenue, units, profit and margin at a glance
  3. 3The projected stockout date, worked out
  4. 4The reorder already sized, one click to a PO
3. Tasks
### Work everyone can see
Tasks link to the SKU or supplier they are about, with owner, priority and due date.

  1. 1Filter by status, priority, assignee and source
  2. 2Priority is its own signal, apart from status
  3. 3Every task links to its SKU or supplier
  4. 4Switch between list and board
4. Shipments
### Delays that stand out
Shipments filter by status, so a delayed container and the stock it puts at risk are visible at once.

  1. 1Status tabs with counts
  2. 2The delay shown beside the status
  3. 3Delays tied to the SKUs at stockout risk
  4. 4Filter by carrier, mode, supplier and destination

Interaction

## From a briefing to a purchase order.

One real path through the product, captured frame by frame.

1. Trigger Review 14 issues The morning briefing counts today's issues. One click opens them.
2. Transition The alert shows its evidence Stock, velocity, cover, lead time and a recommended order, with how the number was worked out.
3. Result A purchase order, drafted Create PO opens an order drafted by AI: supplier, quantity, cost and a note explaining the amount, ready to check and send.

Light and dark

## Built for both themes.

Every screen ships in light and dark from one set of design tokens. Drag to compare.

Light Dark

Style guide

## Colour and type.

Read from the product's own design tokens: one brand colour, neutral surfaces, and status colours kept for meaning.

Brand

HEX #D6579A

\--brand

AI

HEX #5925DC

- Text strong
#0D0D0D
\--text-strong
- Background
#FCFCFC
\--bg-default
- Sidebar
#F2F2F3
\--sidebar-bg
- Success
#12B76A
\--surface-success
- Warning
#F79009
\--surface-warning
- Error
#D92D20
\--surface-error

Inter

- Regular
- Medium
- SemiBold

Every screen

## The full product, desktop and mobile.

Real screens from the live demo, with demo data.

- Inventory
- Product detail
- AI alerts
- Overview on mobile · Inventory on mobile
- Forecasting
- Purchase orders
- Products

Engineering

## Dependable behaviour behind every screen.

The interface works across marketplaces, warehouses and suppliers: search and filters on every list, alerts that carry their evidence, and actions that create linked records. Add the stack and integration details once your engineer confirms them.

- Multi-marketplace views
- Search & filters on every list
- Alerts with evidence
- Tasks linked to SKUs and suppliers

Outcomes

## Designed for a more connected workflow.

What the product demonstrably does. Measured business results will be added only with evidence and approval.

- ### One daily briefing
Today's numbers and issues in a single view, across marketplaces.
- ### Evidence behind every alert
Each alert shows its data, method and confidence before you act.
- ### From alert to action
Purchase orders, transfers and tasks start from the alert itself.

## Building a complex product?

Gr8r helps teams turn challenging requirements into clear digital experiences and working software.

[Discuss your product](https://gr8rstudio.com/contact)

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