Backend Development Background and Motivation Questions
Articulate your journey into backend development and why you prefer server side concerns over other areas. Highlight specific backend projects, responsibilities you owned such as API design, database modeling, scaling and performance work, infrastructure or DevOps involvement, and tradeoffs you made. Demonstrate familiarity with backend principles such as data consistency, caching, reliability, and observability and explain how your background prepared you to solve those problems. Provide concrete examples and outcomes that show technical competence and domain motivation.
HardTechnical
89 practiced
As a senior backend developer responsible for mentoring and raising the team's reliability and observability standards, describe the programs, documentation, and metrics you would implement. Include code review practices, runbooks and playbooks, postmortem culture, onboarding for backend engineers, training sessions, and measurable targets (for example reducing MTTR by X% or increasing deployment frequency). Explain how you would track and report progress over 6 to 12 months.
MediumTechnical
97 practiced
Sketch an end-to-end observability plan for a microservice architecture. Specify the SLIs and SLOs you would define, the key metrics (latency, error-rate, throughput, saturation), tracing spans to instrument, structured logging formats and correlation IDs, alerting thresholds, and how you’d use these signals to prioritize fixes and communicate reliability to stakeholders.
HardSystem Design
82 practiced
Design a backend architecture that must sustain 10,000 requests per second while meeting a 100ms P95 latency SLA. Describe choices for load balancing, API gateway, edge caching, stateless service instances, database sharding/replication, connection pooling, asynchronous workers for long-running tasks, and failure isolation. Include how you would validate capacity and where bottlenecks typically arise.
HardSystem Design
92 practiced
Architect a global e-commerce inventory system that must minimize oversells while remaining highly available across regions. Describe inventory reservation and allocation patterns (pessimistic lock, optimistic decrement with reconciliation, distributed quotas), reconciliation processes, handling of network partitions, and how you would design for flash sales and bursts without causing widespread oversells.
MediumSystem Design
120 practiced
Design a RESTful API for a multi-tenant note-taking application that supports creating, editing, deleting, and sharing notes across users and tenants. Define endpoints and sample request/response shapes, explain your tenant isolation strategy, authentication model, rate-limiting approach, and database choice. Explain tradeoffs between a shared schema, tenant-id columns, and per-tenant databases and how you'd test tenant isolation.
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