Deel Backend Engineer Interview Questions

The questions to prepare for a Deel Backend Engineer interview. Questions from real interview reports rank first. Updated weekly.

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Explain how to detect, prevent, and recover from deadlocks in concurrent PostgreSQL transaction workloads.

Query Optimization for Large Data

Medium

Tests practical SQL performance tuning skills for production workloads.

large datasetsperformancequery optimization

Deel

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Assesses your judgment around performance, maintainability, and control in data access layers.

Decoupled Microservices With State

Hard

Tests your ability to balance microservice independence with consistency requirements.

state managementmicroservices

Deel

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Home Assignment: Express and Sequelize

Hard

Evaluates your ability to implement REST endpoints with authentication-ready backend structure.

express

Deel

Home Exercise: 7 Sequelize Endpoints

Hard

Assesses practical backend implementation skills with ORM-based data access.

Deel

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Maintainable Code for Teams

Medium

Tests your practices for writing clean, understandable, and well-documented frontend code at scale.

best practicescode maintainability

Deel

Locks and When to Use Them

Medium

Evaluates your concurrency control knowledge and practical locking trade-offs.

concurrency

Deel