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Dev Genius

@devgenius1

Coding Tutorials and Everything Related to Product and Software Development

blog.devgenius.io/
Joined May 2020
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Postgres 18 Can Enforce “No Two Bookings Overlap” For You ift.tt/DBWYHTX #coding #programming #development #softwaredevelopment #engineering
Postgres 18 Can Enforce “No Two Bookings Overlap” For You

Postgres 18 Can Enforce “No Two Bookings Overlap” For You

Twenty-four workers double-booked a campervan fleet through a check-then-insert. A WITHOUT OVERLAPS key let zero through, and its temporal…

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Postgresql Processes Roles ift.tt/F4zjKrA #coding #programming #development #softwaredevelopment #engineering
Postgresql Processes Roles

Postgresql Processes Roles

PostgreSQL runs as a family of operating-system processes under one parent, the postmaster (postgres). That parent creates shared memory…

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Learning Java from Scratch with Arbiter — Generics: Bounded Type Parameters, Wildcards, and PECS ift.tt/eJnakRU #coding #programming #development #softwaredevelopment #engineering
Learning Java from Scratch with Arbiter — Generics: Bounded Type Parameters, Wildcards, and PECS

Learning Java from Scratch with Arbiter — Generics: Bounded Type Parameters, Wildcards, and PECS

Day 12 of my Arbiter Learning Journey | Why a bound is a promise the compiler holds you to, why ? extends reads and ? super writes, and how…

blog.devgenius.io
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GitLab CI/CD Pipeline ift.tt/uRa4nQr #coding #programming #development #softwaredevelopment #engineering
GitLab CI/CD Pipeline

GitLab CI/CD Pipeline

using Container Runners interacting with Container Registry

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Microsoft’s new AI sandbox has nine backends. Your policy only knows one. ift.tt/MgmbYLf #coding #programming #development #softwaredevelopment #engineering
Microsoft’s new AI sandbox has nine backends. Your policy only knows one.

Microsoft’s new AI sandbox has nine backends. Your policy only knows one.

Microsoft Execution Containers went GA on 7 October. The policy format is unified. Microsoft’s own documentation says the enforcement is…

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DroidUVC: A new Android SDK for UVC cameras ift.tt/oRljgnH #coding #programming #development #softwaredevelopment #engineering
DroidUVC: A new Android SDK for UVC cameras

DroidUVC: A new Android SDK for UVC cameras

Polaroid is a modern SDK for working with UVC cameras on Android, built on top of libuvc and Jetpack Compose

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Agent session persistence in OpenCode ift.tt/1OK5zrk #coding #programming #development #softwaredevelopment #engineering
Agent session persistence in OpenCode

Agent session persistence in OpenCode

OpenCode v1.18.34.

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Extracting PowerPoint to Markdown Without Losing a Byte ift.tt/kVJDujz #coding #programming #development #softwaredevelopment #engineering
Extracting PowerPoint to Markdown Without Losing a Byte

Extracting PowerPoint to Markdown Without Losing a Byte

A small side project called joey had a plain requirement: take a folder of old PowerPoint decks and turn each one into a single Markdown…

blog.devgenius.io
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Choosing a Model for OpenCode via OpenRouter: Privacy, Price, and Performance ift.tt/t9x4UzM #coding #programming #development #softwaredevelopment #engineering
Choosing a Model for OpenCode via OpenRouter: Privacy, Price, and Performance

Choosing a Model for OpenCode via OpenRouter: Privacy, Price, and Performance

2026–09–27

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Create SKILL.md, AGENTS.md, and PERSONA.md on the fly ift.tt/vLAXMPY #coding #programming #development #softwaredevelopment #engineering
Create SKILL.md, AGENTS.md, and PERSONA.md on the fly

Create SKILL.md, AGENTS.md, and PERSONA.md on the fly

Many times, you don’t actually need to go find or search someone else’s custom SKILL.md. You can simply create your own. What follows is…

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The Pagination Mistake That Makes Your API Slower Every Day ift.tt/tgIwOEv #coding #programming #development #softwaredevelopment #engineering
The Pagination Mistake That Makes Your API Slower Every Day

The Pagination Mistake That Makes Your API Slower Every Day

How keyset pagination keeps your Spring endpoints fast with 10 million rows or more.

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System Design Interview: Where Does an Account Balance Actually Live? ift.tt/tGx19um #coding #programming #development #softwaredevelopment #engineering
System Design Interview: Where Does an Account Balance Actually Live?

System Design Interview: Where Does an Account Balance Actually Live?

One fee row made 32 clients exactly as fast as one, and the checkpoint that replaced it lost 2,215 entries in 30 seconds without raising an…

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We Gave AI Permission to Run Our Tests. Then It Started Testing the Wrong Thing. ift.tt/rT1Nuga #coding #programming #development #softwaredevelopment #engineering
We Gave AI Permission to Run Our Tests. Then It Started Testing the Wrong Thing.

We Gave AI Permission to Run Our Tests. Then It Started Testing the Wrong Thing.

A test in a payments service goes red. FeeCalculatorTest expects a convenience fee of 20.00 on a 1,999.99 transaction, and the code returns…

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Building a Production Transit Monitor on the Edge ift.tt/1zboMNy #coding #programming #development #softwaredevelopment #engineering
Building a Production Transit Monitor on the Edge

Building a Production Transit Monitor on the Edge

The $0.00/Month Architecture

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Top Apps for Tracking Multiple Coding Agent Usage and Reset Times ift.tt/fXLRSyk #coding #programming #development #softwaredevelopment #engineering
Top Apps for Tracking Multiple Coding Agent Usage and Reset Times

Top Apps for Tracking Multiple Coding Agent Usage and Reset Times

I use more than one coding agent.

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SFTP vs. FTPS: Two “Secure FTPs” That Break in Different Places ift.tt/FPr1bRO #coding #programming #development #softwaredevelopment #engineering
SFTP vs. FTPS: Two “Secure FTPs” That Break in Different Places

SFTP vs. FTPS: Two “Secure FTPs” That Break in Different Places

I ran both in Docker, added latency, closed a firewall and watched each one fail in its own way

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Learning Java from Scratch with Arbiter — Exceptions: try/catch/finally, Checked vs. ift.tt/gk2sxdq #coding #programming #development #softwaredevelopment #engineering
Learning Java from Scratch with Arbiter — Exceptions: try/catch/finally, Checked vs.

Learning Java from Scratch with Arbiter — Exceptions: try/catch/finally, Checked vs.

Day 11 of my Arbiter Learning Journey | Why finally is the "always" block, how the parent class you extend decides checked vs. unchecked…

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Evaluating a decision model: Nimble 9B and its base model Qwen3.5–9B ift.tt/QSDPRwm #coding #programming #development #softwaredevelopment #engineering
Evaluating a decision model: Nimble 9B and its base model Qwen3.5–9B

Evaluating a decision model: Nimble 9B and its base model Qwen3.5–9B

I tested a decision model against its own base model on 900 real complaints. Same accuracy, same speed, and one advantage that matters.

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Your Resume Says Senior Java Developer. These 12 Interview Questions Might Disagree. ift.tt/BelLJUf #coding #programming #development #softwaredevelopment #engineering
Your Resume Says Senior Java Developer. These 12 Interview Questions Might Disagree.

Your Resume Says Senior Java Developer. These 12 Interview Questions Might Disagree.

Seven years of Spring Boot experience sounds impressive until someone asks what @Transactional actually guarantees.

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These Go Libraries are underrated — Stop rebuilding them Yourself ift.tt/TRfXHZF #coding #programming #development #softwaredevelopment #engineering
These Go Libraries are underrated — Stop rebuilding them Yourself

These Go Libraries are underrated — Stop rebuilding them Yourself

Less code to own, fewer edge cases to rediscover, and more time to ship

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