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Our quiz app is two deployed things. A Next.js app, and a long-lived WebSocket server that holds the game clock, because a serverless function canno…
Imagine your company has 50 employees and 80 IT assets, including laptops, monitors, and smartphones. An employee leaves the organisation. HR confir…
problem statement in a typical microservice, each instance opens its own pg client pool. during a traffic spike the aggregate connection count can e…
At 2 a.m. on a Tuesday, a client's reporting replica silently stopped applying changes. The publisher kept accepting writes. The replica kept answer…
Introduction: The Headline That Made My Stomach Drop Almost every week, we see another headline about a major tech company or hot startup suffering…
This is a submission for the MLH x DEV Writing Challenge What I Built Here is a bug that drove me crazy for three days straight. You ask an autonomo…
We hit a wall last month. Traffic was stable, CPU was idle, but p99 latency spiked to 2s. The PostgreSQL server looked healthy. The culprit wasn't t…
Families manage money and responsibilities in ways that often resemble small organizations. They coordinate recurring contributions, fund shared pro…
Most database crashes in Node.js apps don’t happen because of heavy queries. They happen because of unmanaged connection pools. When your TypeScript…
Put the user filter inside the vector search itself. If you search everything and remove other people’s chunks afterwards, those chunks still use up…
Why "just retry" creates duplicate payments, and a PostgreSQL-backed design for idempotency keys that survives double clicks, timeouts, crashes and…
Short answer: use a staged retrieval design with explicit collections, bounded queries, and traceable source context, then make index cost a schema…
Under CIP-1694, a Cardano governance vote can carry an anchor : a URL to a document that explains the vote, plus a blake2b-256 hash of that document…
Most backend bottlenecks don’t happen because of poor hardware. They happen because of unindexed database queries, sloppy async error handling, and…
Taking a mission-critical B2B SaaS database offline for a multi-hour ALTER TABLE migration is no longer acceptable for high-growth engineering teams…
Work on a distributed system long enough and you'll know the particular cold sweat of the dual write. You insert an order into the database and the…
PostgreSQL Point-in-Time Recovery in Kubernetes: WAL-G + Stolon Pattern We recovered a 2TB PostgreSQL database to 14:32:18 yesterday after a botched…
We run Docto24 , a German telemedicine platform: patients book online consultations, licensed physicians review medical questionnaires and issue e-p…
Most of the work in Nakodo is a pipeline that keeps going: search, read profiles, score, find the published contact address, draft, send, follow up.…
The Real Problem Is Not Duplicate Requests The naive backend implementation looks safe until two requests arrive at the same time. Both check whethe…
In distributed microservice architectures, synchronizing database updates with downstream event streams is a notorious source of silent data drift.…
During system design interviews or production firefighting sessions, a common piece of logic always resurfaces: "If our Hibernate threads are starvi…
For most B2B SaaS apps, a tenant_id column plus row-level security (RLS) on every table is the right default: you keep one schema and one migration…
The first version of my hackathon platform had a login screen, a form to create events, and a page where judges could type in scores. It looked like…
Building a multi-tenant SaaS application is fraught with danger. In a traditional shared-database architecture, every single SQL query must remember…
In an early-stage hobby project, updating a database schema is trivial: you stop the application, run ALTER TABLE users RENAME COLUMN username TO ha…
Today I want to talk about split-brain. The name sounds dramatic, and the problem is dramatic too. One system splits into two halves, and each half…
Most ETL tutorials show a perfect, frictionless flow. The reality? My pipeline turned into a festival of KeyError's , outdated schemas, and API payl…
It’s 03:00 PM on a Tuesday. Your monitoring dashboards go red. Incoming requests are timing out, HTTP 504 errors are spiking, and users are reportin…
It’s 02:14 AM. Your alert manager fires: an account balance dropped below zero, or a user received two trial credits instead of one. You trace the l…