High Architecture Question 156 of 215

How do you handle multi-tenancy in EF Core?

.NET / C# · Speak this in 60–90 seconds · Faridabad & Delhi NCR

PICTURE THIS: DATABASE INDEX

Without indexScan every row
With indexJump to keys
CostWrites slower

Simple meaning

I add tenant id filters globally and set tenant from the request.

1

WHY — Architecture instead of guessing?

Why interviewers care about Architecture:

This is a process

question about Architecture.

Panels listen for order,

trade-offs, and what you would actually do on a .NET project - not buzzwords.

Stay structured

Name the idea, why it exists, then one short example.

Close cleanly

End with when you use it and one common pitfall.

2

STEPS — What happens step by step?

Before you speak the answer, walk the interviewer through these steps:

  1. 1
    I add tenant id

    filters globally and set tenant from the request.

  2. 2
    Why it exists

    Migrations and indexes include tenant.

  3. 3
    Cross-tenant leaks are the

    main risk to test.

  4. 4
    Give an example

    One tiny concrete case you can say aloud.

  5. 5
    Common mistake

    What juniors usually get wrong.

  6. 6
    Close

    When you pick this over the alternative.

3

EXAMPLE — See it in action

Here's a short line you can speak, broken into clear beats:

Say this line
“Migrations and indexes include tenant.”
Break into beats
Migrationsandindexesincludetenant
Speaking order
298740833747163290

Note: Adapt this scaffold to your own project — keep it under 60–90 seconds.

Key takeaway

I add tenant id filters globally and set tenant from the request. Migrations and indexes include tenant.

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