API Design
Design a small, minimal REST API for a real scenario. Tests resource modelling, scope judgment, and how you handle edge cases.
Asynchronous Processing
Manage long-running tasks and message queues. Tests event loops, worker threads, and distributed task queues (like RabbitMQ or BullMQ).
Authentication & Authorization
Secure user identities and permissions. Tests JWT lifecycles, OAuth flows, and Role-Based Access Control (RBAC).
Backend Performance Optimization
Speed up slow applications. Tests profiling, caching strategies (Redis), and mitigating N+1 query problems.
CI/CD Pipeline Setup
Design automated deployment workflows. Tests DevOps fundamentals, multi-environment setups, and zero-downtime deployment strategies.
Code Refactoring
Modernize and clean up legacy codebases. Tests SOLID principles, identifying code smells, and safely migrating logic.
Containerization & Orchestration
Deploy applications reliably at scale. Tests Docker best practices, multi-container Compose setups, and Kubernetes fundamentals.
Database Modeling
Design robust relational schemas. Tests normalization, understanding of indexes, and planning for complex data relationships.
Debug & Fix
Diagnose a real-looking bug, fix it, and explain the root cause in plain English. Tests debugging, code craft, and technical communication.
Quality Assurance & Bug Reporting
Think like a tester, not a developer. Tests manual test case design, structured bug reporting, exploratory test charters, regression planning, and the bridge from manual to automated testing.