Xeven Labs
Blog

Notes From Real Projects

No generic listicles — these are engineering write-ups pulled directly from work we've shipped.

MERN5 min read

Socket Architecture for Live Location Tracking Without Lag

Live delivery tracking looks simple in a demo with one driver. It falls apart under real production load unless the socket layer is deliberately designed for it.

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SaaS4 min read

When In-Memory Rate Limiting Stops Being Enough

A simple in-memory rate limiter is a real deterrent against casual abuse and a fine default — until your app runs on more than one server instance. Here's how to tell which side of that line you're on.

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MERN5 min read

Search and Moderation on a Two-Sided Marketplace: Fast Without Being Fraud-Friendly

A listings marketplace needs search fast enough for real-time browsing and moderation strict enough to stop fraud — usually a straight trade-off. Here is how we avoided making it one.

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Shopify6 min read

Migrating 17,500+ Orders from BigCommerce to Shopify Without Losing SEO

A full platform migration — 140+ products, 6,300+ customers, 17,500+ orders, 800+ reviews — with zero data loss and every ranking preserved.

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SaaS5 min read

Row-Level Multi-Tenant Isolation in Supabase: How We Guaranteed Zero Data Leakage

Building a production SaaS on Supabase meant the database — not the application layer — had to be the thing guaranteeing tenants never see each other's data.

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SaaS5 min read

Why We Chose a Graph Database Over Relational Tables for a Data Intelligence Platform

A relationship-scoring engine over public data hit single-digit-millisecond response times — but only after we stopped fighting relational tables.

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Mobile4 min read

Battery-Efficient Background Location Tracking in Flutter

Multiple production booking apps live on the Play Store, all fighting the same battle: GPS accuracy versus battery drain in the background.

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AI6 min read

Building a RAG Pipeline That Actually Cites Its Sources

Users upload documents, ask questions, and get answers — but the whole system is worthless if you can't trust or verify the citation.

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Shopify5 min read

Real-Time LTL Freight Rates at Shopify Checkout: A Custom Middleware Approach

No standard Shopify app handled real-time LTL rate calculation with liftgate and residential-delivery logic — so we built the middleware ourselves.

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