Offline ATM Refill Task Architecture | Dataford Interview Questions

Design the complete client-side architecture for a system that assigns and tracks ATM refilling tasks for field workers, including offline synchronization.

For this coding exercise, implement the synchronization core as a pure function. Merge local and remote task snapshots, apply pending offline field operations deterministically, ignore operations already acknowledged by the server, and return the merged tasks plus operations that still require upload.

The function receives dictionaries keyed by task ID and returns { "tasks": ..., "pending_ops": ... }. Each task contains status, assignee, per-field timestamps, version, and optional applied_ops; each operation contains op_id, task_id, field, value, and ts.

Constraints

1 <= number of tasks <= 500
0 <= number of pending operations <= 2,000
Each operation targets exactly one task field
Task fields are limited to status and assignee
Timestamps are non-negative integers
Operation IDs are unique within the pending operation list

Function Signature

def reconcile_tasks(local_tasks, remote_tasks, pending_ops):

Your question is Offline ATM Refill Task Architecture. Start with the requirements in the Question tab.

Run and submit as often as you like. When you're ready, talk me through your approach or go straight to the code.

Problem

Design the complete client-side architecture for a system that assigns and tracks ATM refilling tasks for field workers, including offline synchronization.

Constraints

1 <= number of tasks <= 500
0 <= number of pending operations <= 2,000
Each operation targets exactly one task field
Task fields are limited to status and assignee
Timestamps are non-negative integers
Operation IDs are unique within the pending operation list

Function Signature

def reconcile_tasks(local_tasks, remote_tasks, pending_ops):

Your question is Offline ATM Refill Task Architecture. Start with the requirements in the Question tab.

Run and submit as often as you like. When you're ready, talk me through your approach or go straight to the code.