iOS Live Coding Task

Welcome! This is a collaborative session — we're not looking for perfection, we're interested in how you think, how you structure your code, and how you communicate decisions as you go.

Feel free to think out loud, ask questions, and discuss trade-offs as you work. There are no trick questions.

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Prerequisites

• Xcode 26 or later
• iOS 26+ deployment target
• No third-party dependencies — the project builds out of the box
• No AI: Please refrain from using any AI tools/agents to help you with this task.

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Context

The project contains a basic data layer and a stubbed-out TransactionListScreen. The NetworkClient currently simulates a network call by resolving pre-populated mock data with an artificial 500 ms delay.

Project structure

iOS_technical_task/
├── DataLayer/
│   ├── Models/
│   │   └── TransactionDTO.swift       — Transaction, Amount
│   └── TransactionsEndpoint.swift  — Mock endpoints + Endpoint<T> type
├── Networking/
│   └── NetworkClient.swift         — Async GET helper
└── PresentationLayer/
    └── TransactionListScreen/
        └── TransactionListScreen.swift   — Your starting point

Data model

Field	Type	Description
id	UUID	Unique transaction identifier
amount.value	Decimal	Monetary value (can be negative for refunds)
amount.currency	String	ISO 4217 currency code, e.g. "GBP"
createdAt	Date	Creation timestamp
merchantName	String	Display name of the merchant

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Tasks

1. Display a list of transactions

Fetch the transaction list using NetworkClient and display it in TransactionListScreen.

Each row should show, at minimum:

• Merchant name
• Formatted amount (with currency symbol)
• Transaction status

Things to consider:

• How do you manage loading, success, and error states?
• How do you keep the view layer decoupled from the data layer?

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2. Search

Add a search bar that lets the user filter the transaction list by merchant name.

Implement this as local (client-side) filtering for now, but be ready to discuss how you would approach it with a real backend.

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3. Navigate to a transaction detail screen

Tapping a row should push a detail screen that displays all the information for that transaction.

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Guidelines

• Use SwiftUI and Swift Concurrency (async/await)
• No third-party dependencies needed
• There's no single right answer — we value clear reasoning over completeness
• Feel free to refactor any existing code if you think it improves the solution