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Idempotency Keys: Designing APIs That Survive Retries

Backend

April 202610 min read

Idempotency Keys: Designing APIs That Survive Retries

Double-charged payments start with a timeout and a retry. How to design idempotent endpoints with idempotency keys, from storage schema to client behavior.

Reliable Background Jobs with BullMQ and NestJS

Backend

April 202610 min read

Reliable Background Jobs with BullMQ and NestJS

Retries, exponential backoff, dead-letter queues, and monitoring: a production blueprint for background jobs with BullMQ, Redis, and NestJS that survives bad days.

API Versioning Strategies: URL, Header, or No Version at All

Software Development

April 202610 min read

API Versioning Strategies: URL, Header, or No Version at All

URL paths, headers, date-pinned versions, or none: how Stripe and GitHub evolve REST APIs without breaking clients, and what a small team should actually do.

ERP Inventory Module Design: Movements, Valuation, Guards

ERP

April 202610 min read

ERP Inventory Module Design: Movements, Valuation, Guards

How I design ERP inventory modules: immutable stock movement ledgers, FIFO vs average costing, and negative stock guards that actually hold under load.

Multi-Currency Accounting in ERP: Rates, FX Gains, IDR Rounding

ERP

April 202610 min read

Multi-Currency Accounting in ERP: Rates, FX Gains, IDR Rounding

Designing multi-currency accounting in a custom ERP: dual-currency journal lines, realized vs unrealized FX gains, and the IDR rounding rules nobody warns you about.

ERP Approval Matrix Design: Stop Hardcoding Approval Chains

ERP

April 202610 min read

ERP Approval Matrix Design: Stop Hardcoding Approval Chains

How to design a configurable ERP approval matrix — amount bands, roles, departments — so finance can change approvers without a deployment. Lessons from a real build.

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