_1751731246795-BygAaJJK.png){kind=logo}
Engineering & product playbooks
Hands-on playbooks, decision frameworks, and case studies from the team building AI-native products at CodeNicely.
Database Migration Cheatsheet: Zero-Downtime Cutover Patterns
A pattern-level reference for zero-downtime database cutovers. Match your migration type — schema change, engine swap, or cloud move — to the right sequencing strategy without guessing.
Rate-Limit a Multi-Tenant API Without Leaking Tenant State
The standard 'key per user per route' Redis rate limiter silently leaks whether a tenant exists — and lets one noisy tenant eat everyone else's budget. Here's how to fix both, with runnable code.
Your API Versioning Strategy Is a Roadmap to Your Worst Day
Most API versioning failures aren't naming problems. They're contract enforcement problems—and every month you delay a migration, the divergence between v1 and v3 compounds into a cutover that might be impossible.
5 Mistakes Teams Make When Automating Medical Prescription Workflows
Most prescription automation systems fail not at OCR, but at the silent hand-off between a confident AI decision and the downstream system that trusts it. Here are the five mistakes we see pharmacy operations teams make — and how to recover from each.
How GimBooks Scaled GST Filing to 3M Users Without Breaking
A deep look at the architectural decisions that let GimBooks scale GST filing to millions of Indian SMB users. The real bottleneck was not compute — it was stateful rule evaluation across a financial year.
Top Legacy Modernization Companies in India for US Enterprises
A candid breakdown of which categories of Indian legacy modernization vendors can safely re-platform a live, revenue-generating monolith — and which will discover the real complexity only after kickoff. Written for US mid-market CTOs evaluating partners without a Big Four budget.
How to Migrate a Live SaaS Billing System to Usage-Based Pricing
A practical, opinionated sequence for switching a live SaaS billing system from seats to consumption without breaking mid-cycle invoices or triggering a revenue recognition gap. Built for COOs and Heads of Product executing the migration, not planning it.
The Feature Flag Trap: Why Your Kill Switch Can Kill You
Feature flags start as a safety mechanism and end as an invisible second codebase. Here's the compound-interest problem nobody warned you about — and a practical way to think about flag debt before it starts causing bugs you can't explain.
Retry Failed Jobs in Postgres Without a Queue Server
You don't need Redis or Sidekiq to stop losing background jobs. Postgres 9.5+ ships with SKIP LOCKED, which is enough to build a concurrent job queue with retries, exponential backoff, and a dead-letter state in about 100 lines of SQL and Python.
Kafka vs. Pub/Sub vs. SQS: Pick the Right Event Bus
Most event bus comparisons benchmark throughput and miss the one dimension that forces a re-platform: whether the broker keeps a replayable log or destroys messages on ack. Here's how Kafka, Google Pub/Sub, and AWS SQS actually differ when a second downstream service needs the same stream.
Multi-Tenant Data Isolation: The Cheatsheet
A dense reference for SaaS CTOs who need to answer enterprise security questionnaires about how tenant data is isolated. Covers row-level security in Postgres, schema-per-tenant, database-per-tenant, attack surfaces, and the migration-velocity tradeoffs nobody warns you about.
5 Mistakes Teams Make When Embedding AI into a Live E-Commerce Operation
Your AI pilot hit 94% accuracy. In production, exceptions are piling up and staff are routing around the model. Here's why that happens — and the five integration mistakes that cause it.