Blog — Page 13 of 53
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Designing an E-Commerce Order System: Cart Management, Checkout Orchestration, and Fulfillment Workflows at Scale
A practical guide to e-commerce order system design covering cart state management, multi-step checkout orchestration, order state machines, fulfillment workflows, and the consistency challenges of coordinating payment, inventory, and order services.
Designing a Tenant Data Import System: File Parsing, Schema Mapping, and Error Recovery for SaaS Onboarding at Scale
Every SaaS product eventually has to let customers bring their own data. This guide covers the full architecture: streaming file parsing, intelligent column mapping, validation pipelines, background processing with progress tracking, error recovery strategies, idempotency for resumed imports, and multi-tenant concurrency.
Designing an Agent Gateway: Centralized Routing, Lifecycle Management, and Fleet Observability for Production AI Agent Systems
Most teams manage AI agents the way early SaaS teams managed microservices: one at a time, by hand, until something breaks. This guide covers the architecture of a centralized agent gateway, including agent registration, typed routing, permission boundary enforcement, token budget enforcement at the gateway layer, and fleet-wide observability.
Designing an Event Ticketing System: Seat Inventory, Flash Sale Concurrency, and Bot Mitigation at Scale
A production-focused walkthrough of event ticketing system design covering seat map data modeling, TTL-based inventory holds, distributed and optimistic locking under flash sale concurrency, payment timeout coordination, bot mitigation strategies, and dynamic pricing tradeoffs.
Designing an AI Agent Cost Governance System: Token Budgets, Spend Caps, and Automated Circuit Breakers for Production LLM Deployments
How to prevent AI cost overruns in production: per-agent token budgets with hard enforcement, team-level spend allocation, circuit breakers that halt runaway agent loops, cost attribution, model routing by tier, and the critical difference between monitoring and enforcement.
Designing a Virtual Waiting Room: Fair Queuing, Position Tracking, and Capacity-Gated Access for High-Demand Systems
A deep dive into virtual waiting room system design: distributed queue management, FIFO with jitter resistance, real-time position tracking without global locks, capacity-gated admission, bot detection, and production failure modes including clock skew and refresh-on-position-loss.
The Modular Monolith: Vertical Slices, Bounded Contexts, and Module Boundaries in TypeScript
A practical guide to structuring a TypeScript backend as a modular monolith. Covers bounded context design, vertical slice architecture, enforcing module isolation at the code level, inter-module communication via events, and the concrete signals that justify extracting a module into a separate service.
Designing a Live Commerce Platform: Real-Time Bidding, Inventory Reservation, and Multi-Channel Product Sync at Scale
Live commerce platforms combine the worst concurrency problems from flash sales, real-time auctions, and multi-channel inventory sync into a single user session. This guide covers the backend architecture: WebSocket fan-out for bidding, pessimistic reservation under concurrent viewer load, multi-channel catalog sync across TikTok Shop and Instagram, and edge-rendered shoppable video.
Designing a Multi-Region Architecture: Data Replication, Failover Strategies, and Latency Optimization for Global Applications
A practitioner's guide to multi-region architecture covering active-active vs active-passive deployments, database replication strategies, DNS-based routing, edge caching, failover automation, and the production pitfalls most teams hit when going global.
Supervisory Engineering for Agentic Systems: Human Oversight Architecture That Prevents the 40% Cancellation Rate
Gartner projects 40% of agentic AI projects will be cancelled by 2027. This article breaks down supervisory engineering: the five oversight layers, a TypeScript supervisory orchestration implementation, and a comparison of supervision architectures for teams deploying autonomous agents in production.
Designing a Distributed Job Queue: Task Scheduling, Worker Pools, and Delivery Guarantees at Scale
A system design deep-dive into building a distributed job queue from scratch. Covers core components, scheduling strategies, at-least-once vs exactly-once delivery, worker pool management, failure handling, and horizontal scaling patterns with TypeScript examples.
Designing a Recommendation System: Collaborative Filtering, Real-Time Scoring, and Feature Store Architecture
A full architecture walkthrough for production recommendation systems: candidate generation with collaborative filtering and content-based approaches, ML ranking with feature stores, a real-time serving layer with latency budgets, and production concerns including cold start, feedback loops, A/B testing, and drift detection.