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Aporeon interview preparation

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Backend System Design Foundation

Core Designs

Practical backend feature designs: exports, notifications, uploads, webhooks, tenant boundaries, search, dashboards, workflows, and product operations.

30 drillsPractice one at a timeOrdered pathSystem design

Recommended start

Report Export Backend

Designs an async export flow for large reports without blocking API requests or exhausting database and memory resources.

Hard~20 minStep 1 of 30

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30 of 30 shown

1Report Export BackendRecommended startDesigns an async export flow for large reports without blocking API requests or exhausting database and memory resources.System designHard~20 min.NETApplication InsightsASP.NET CorePractice 2Notification SystemDesigns email, in-app, and push-style notification delivery with preferences, retries, and idempotent side effects.System designMedium~16 min.NETApplication InsightsASP.NET CorePractice 3File UploadsDesigns a file workflow with metadata, durable storage, validation, access control, scanning, and safe downloads.System designHard~20 min.NETApplication InsightsASP.NET CorePractice 4Audit Log DesignDesigns immutable audit records for sensitive administrative changes with useful before/after context and safe retention.System designMedium~16 min.NETApplication InsightsASP.NET CorePractice 5Webhook IngestionDesigns authenticated, replay-resistant webhook intake with durable acknowledgement, idempotent asynchronous processing, ordering policy, and reconciliation.System designHard~20 min.NETApplication InsightsASP.NET CorePractice 6Idempotent CheckoutDesigns a checkout or order creation flow that survives client retries without duplicate orders, payments, or messages.System designHard~20 min.NETApplication InsightsASP.NET CorePractice 7Multi-tenant BoundaryDesigns tenant isolation across API, data, cache, background jobs, search, and admin access.System designHard~20 min.NETApplication InsightsASP.NET CorePractice 8Search BackendDesigns search and filtering with controlled query contracts, indexing, pagination, ranking, and operational limits.System designMedium~16 min.NETApplication InsightsASP.NET CorePractice 9Activity FeedDesigns an activity feed with event capture, fan-out strategy, pagination, privacy, and read performance.System designMedium~16 min.NETApplication InsightsASP.NET CorePractice 10Dashboard Read ModelDesigns dashboard APIs with precomputed metrics, freshness rules, query cost control, and drill-down support.System designHard~20 min.NETApplication InsightsASP.NET CorePractice 11Public API LimitsDesigns layered public API protection with caller identity, quotas, burst limits, abuse signals, and client-friendly responses.System designHard~20 min.NETApplication InsightsASP.NET CorePractice 12RBAC and OwnershipDesigns authorization that combines roles, permissions, tenant context, resource ownership, and auditability.System designHard~20 min.NETApplication InsightsASP.NET CorePractice 13Feature Flag BackendDesigns feature flag storage, targeting, safe defaults, auditability, and rollout observability for backend behavior.System designMedium~16 min.NETApplication InsightsASP.NET CorePractice 14Recurring JobsDesigns scheduled jobs with locking, idempotency, observability, retries, and safe operations across multiple instances.System designMedium~16 min.NETApplication InsightsASP.NET CorePractice 15Integration SyncDesigns synchronization with an external system using cursors, retries, idempotency, rate limits, and reconciliation.System designHard~20 min.NETApplication InsightsASP.NET CorePractice 16Partner APIDesigns an external partner API with authentication, versioning, rate limits, idempotency, documentation, and compatibility.System designHard~20 min.NETApplication InsightsASP.NET CorePractice 17Data RetentionDesigns deletion, retention, soft delete, hard delete, backups, audit records, and asynchronous cleanup across related data.System designMedium~16 min.NETApplication InsightsASP.NET CorePractice 18Comments and MentionsDesigns comments with permissions, threading, mentions, notifications, editing history, and moderation concerns.System designMedium~16 min.NETApplication InsightsASP.NET CorePractice 19User InvitationsDesigns an invitation workflow with token security, expiry, membership creation, email delivery, and replay-safe onboarding.System designMedium~16 min.NETApplication InsightsASP.NET CorePractice 20Team MembershipDesigns membership, role changes, removal, ownership transfer, and permission updates without weakening tenant boundaries.System designMedium~16 min.NETApplication InsightsASP.NET CorePractice 21Bulk Import PreviewDesigns a safe admin import flow with upload staging, validation, preview, confirmation, idempotency, and rollback strategy.System designHard~20 min.NETApplication InsightsASP.NET CorePractice 22Approval WorkflowDesigns draft, review, publish, rollback, and audit behavior for content managed by editors and admins.System designMedium~16 min.NETApplication InsightsASP.NET CorePractice 23Saved SearchesDesigns saved filters, scheduled matching, alert delivery, and freshness trade-offs for search-driven product workflows.System designMedium~16 min.NETApplication InsightsASP.NET CorePractice 24Notification PreferencesDesigns user preferences, channel rules, unsubscribe behavior, digest generation, and delivery suppression.System designMedium~16 min.NETApplication InsightsASP.NET CorePractice 25Moderation WorkflowDesigns user reports, moderation queues, actions, audit history, abuse controls, and appeal-friendly decisions.System designHard~20 min.NETApplication InsightsASP.NET CorePractice 26User SettingsDesigns a settings service with defaults, validation, scoped preferences, caching, and safe rollout of new settings.System designEasy~12 min.NETApplication InsightsASP.NET CorePractice 27EntitlementsDesigns plan entitlements, provider webhooks, idempotent billing updates, access checks, grace periods, and support overrides.System designHard~20 min.NETApplication InsightsASP.NET CorePractice 28Support ImpersonationDesigns a controlled support impersonation workflow with scoped access, approvals, visible banners, audit trails, and session boundaries.System designHard~20 min.NETApplication InsightsASP.NET CorePractice 29Workflow State MachineDesigns explicit workflow states, allowed transitions, guard rules, audit history, idempotency, and operational repair paths.System designMedium~16 min.NETApplication InsightsASP.NET CorePractice 30Live UpdatesDesigns live updates with polling, server-sent events, or WebSockets while preserving authorization, ordering, scale, and fallback behavior.System designHard~20 min.NETApplication InsightsASP.NET CorePractice

Practice order

30 drillsOne at a time

1Report Export BackendUp next / Hard / ~20 min
2Notification SystemMedium / ~16 min
3File UploadsHard / ~20 min
4Audit Log DesignMedium / ~16 min
5Webhook IngestionHard / ~20 min
6Idempotent CheckoutHard / ~20 min
7Multi-tenant BoundaryHard / ~20 min
8Search BackendMedium / ~16 min

+22 more drills in this section