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system design
Hard
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#1
1. Top 5 System Design Questions Jan 2026
Category: Interval-based system design problem# Top 5 Recently Asked System Design Questions - Microsoft These are the commonly asked system design questions from Microsoft interviews and some...Input: List
Output: Computed result
system design
Senior
api design
#1
1. [OA] Design a Background Task Scheduler for Microsoft To-Do
To help users manage their tasks in Microsoft To-Do, you need to design a background task scheduler that handles task reminders efficiently, even when the app is not active. Implement a class that schedules tasks to send notifications based on user-configured times.Class Signature:
Input:
Output:
Explanation: The task will be scheduled to remind the user at the specified time.Example 2:
Input:
Output:
Explanation: Notifies the user about scheduled tasks due to be reminded.Constraints:
-
-
python
class TaskScheduler:
def __init__(self):
def schedule_task(self, task: Task, time: str) -> None:
def execute_tasks(self) -> None:
Input:
task_scheduler = TaskScheduler(), task_scheduler.schedule_task(task, '2023-12-01T10:00:00')Output:
NoneExplanation: The task will be scheduled to remind the user at the specified time.Example 2:
Input:
task_scheduler.execute_tasks()Output:
['Task Reminder']Explanation: Notifies the user about scheduled tasks due to be reminded.Constraints:
-
1 <= tasks.count <= 100-
1 <= task.title.length <= 100
system design
Senior
api design
#2
2. [OA] Design an Offline-first Sync Engine for Microsoft OneNote
As OneNote is often used in offline scenarios, designing a sync engine that efficiently reconciles data between local storage and the server is crucial. Design a class that can sync notes created offline with a remote database when a user's internet connection is restored.Class Signature:
Input:
Output:
Explanation: A note is created offline, awaiting sync.Example 2:
Input:
Output:
Explanation: All offline notes are successfully synced to the remote database.Constraints:
-
-
python
class SyncEngine:
def __init__(self, local_db: Database, remote_db: Database):
def create_note(self, note: Note) -> None:
def sync(self) -> None:
Input:
sync_engine = SyncEngine(local_db, remote_db), sync_engine.create_note(note)Output:
NoneExplanation: A note is created offline, awaiting sync.Example 2:
Input:
sync_engine.sync()Output:
TrueExplanation: All offline notes are successfully synced to the remote database.Constraints:
-
1 <= notes.count <= 1000-
1 <= note.content.length <= 10^4Related Microsoft Mobile Engineer interview prep
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