Wise Backend Interview Exercise

A 45-minute live coding exercise for senior backend engineers.

The scenario

You're building a Job Management API for Wise's logistics platform. Drivers pick up and deliver cargo between depots. The API is a GraphQL service written in Go.

The project is already scaffolded and compiles out of the box. Your job is to implement the business logic.

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Getting started

Prerequisites: Go 1.23+

go run .

The server starts on http://localhost:8080 with a GraphQL playground where you can test your work interactively.

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What's already built

File/Package	Description
graph/schema.graphqls	Full GraphQL schema
graph/schema.resolvers.go	Resolver stubs — this is where you'll work
graph/resolver.go	Dependency injection for the resolver
internal/model/	Domain models (Job, Driver, Depot, JobStatus)
internal/repository/	Repository interface + in-memory implementation (pre-seeded with data)
internal/service/job_service.go	Service skeleton — you'll implement the business logic here

The drivers and driver queries are pre-implemented as working examples of the patterns used in this codebase.

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Tasks

See TASKS.md for the full exercise brief.

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Seed data

The in-memory repository is pre-seeded with:

• 3 depots: Birmingham Central, Solihull Hub, Coventry Distribution Centre
• 4 drivers: Tom McIntosh (DRV-1), Dominic Szabad (DRV-2), Tariq Avila (DRV-3), Dean Nicklin (DRV-4)
• 8 jobs in various statuses — including JOB-3 already IN_PROGRESS and assigned to Dominic Szabad

Useful IDs to test with: JOB-1, JOB-3, DRV-1, DRV-2

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Example query

Once the server is running, try this in the playground:

{
  drivers {
    id
    name
    licenceNumber
  }
}