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Learn before you build
What software really costs, how long it takes, how to pick a partner, and how to put AI tools to work — for startups, SMBs and enterprises.
What Is RAG? Stop Letting Your LLM Hallucinate Your Own Data
Your chatbot invents answers about your own product because the LLM has never seen your docs. Here's what RAG actually does, why retrieval quality matters more than model choice, and when fine-tuning is the wrong fix.
Rate-Limit LLM API Calls Across Workers Without a Queue
Your OpenAI feature works fine on one worker and dies on four. Here's how to build a distributed token-bucket limiter in Redis with an atomic Lua script — no queue, no broker, no rewrites.
AI Feature Flags Cheatsheet: What to Gate, Rollback, and Monitor
Standard feature flags gate users. AI features need a second layer that gates model behavior — version, prompt, embedding schema, output quality. Here's the reference cheatsheet.
How to Migrate a Multi-Tenant SaaS Schema Without Breaking Tenants
Every migration guide assumes all consumers of the database deploy at the same time. In a multi-tenant SaaS, they don't. Here's the playbook we run when tenants are on different release tracks and a single ALTER TABLE would break half your customers.
Backfill Embeddings for 1M Rows Without Killing Postgres
Backfilling embeddings into a live Postgres table with a million rows isn't an ETL job — it's a queue problem. Here's a lease-based pattern that survives crashes, respects rate limits, and never holds a lock longer than one UPDATE.
GST Reconciliation Failures: A Dev-Side Cheatsheet
A dense reference for engineers whose GST reconciliation passes unit tests but bleeds ITC mismatch tickets in production. Covers GSTR-2B refresh cadence, RCM, QRMP, and GSTIN state transitions.
Stream LLM Responses to a React Frontend Without Melting
Your ChatGPT-style feature stalls for 6 seconds before rendering a single token. Here is how to stream LLM responses to React properly — with auth, aborts, and partial JSON that does not double-render on flaky networks.
How to Cut Over a Live Database Schema Without Downtime
A step-by-step playbook for renaming columns, dropping tables, and restructuring core models on a live production database — without a maintenance window. Written for CTOs whose deployment pipeline isn't clean enough to ship app and DB changes atomically.
What Is Idempotency? Stop Charging Customers Twice
A double-charge after a mobile timeout is almost always a retry bug, not a payment gateway bug. Here's how idempotency keys work, and why the fix lives in your client — not your server.
AI Observability Cheatsheet: What to Log, Alert, and Ignore
Standard APM misses the signals that actually break LLM features in production. This cheatsheet covers exactly what to log, what to alert on, and what to stop paging engineers about at 2am.
What Is a Webhook? And Why Your Integration Keeps Breaking
A webhook is a push notification between servers — the provider calls you when something happens, instead of you polling them. Most webhook failures in production are not missed deliveries; they are duplicate deliveries processed twice.
How to Retire a Legacy System Without Freezing the Business
Retiring a legacy billing, inventory, or order management system doesn't require a six-month feature freeze or a terrifying big-bang cutover. Here's the sequencing playbook that keeps the business running while the old system dies quietly in the background.
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