Two Bugs That Taught Me More Than Any Tutorial
Introduction I'm Calvin, a backend engineering intern at HNG, currently wrapping up HNG14. This post is about two tasks from the internship that genui…
DevOps
⚑ Report a ProblemLatest DevOps news from Tech News
All topics
agents
ai
api
architecture
automation
aws
beginners
career
cloud
database
devchallenge
devops
docker
gemma
javascript
kubernetes
llm
machinelearning
mcp
opensource
performance
productivity
programming
python
security
showdev
softwareengineering
tutorial
typescript
webdev
Why Custom Software Projects Fail (And How to Avoid the Most Common Mistakes)
Why Custom Software Projects Fail (And How to Avoid the Most Common Mistakes) After working on software projects of different sizes, I've noticed that…
System Design - 17. Service Discovery & Service Mesh: How Thousands of Services Find Each Other
Covers: Client-Side vs Server-Side Discovery, Service Registries, Service Mesh (Istio/Envoy), Kubernetes DNS The Problem That Didn't Exist in the Mono…
System Design - 14. Event-Driven Architecture: Event Sourcing, CQRS, and the Outbox Pattern Explained
Event-Driven Architecture: Event Sourcing, CQRS, and the Outbox Pattern Explained Covers: Event Sourcing, CQRS, Outbox Pattern, Choreography vs Orches…
8GB to 70B: A Real Hardware Guide for Local LLMs
The idea of running a local LLM (Large Language Model) has always appealed to me, especially concerning data privacy and cost control. However, when I…
Is Open Source Sustainable?
Since the beginning of my career, for a full 20 years, open-source solutions have been an indispensable part of my system architectures and software d…
An AI Module Smaller Than a Smartphone Photo. Are We Underestimating the Computer We Carry Every Day?
The Idea and the Main Engineering Challenges Recently, I released a new offline AI feature for my Android application as a separate module. The entire…
Set Up Your Own ChatGPT: Ollama + Open WebUI for Data That Never
Set Up Your Own ChatGPT: Ollama + Open WebUI for Data That Never Leaves Home As artificial intelligence models rapidly integrate into our lives, priva…
What is utility-first software? (And why most tools ignore it)
There's a tool I used every day for two years. It did invoicing, project management, time tracking, client portals, proposals, contracts, team collabo…
RPGMapEditor.com: A Free Browser-Based Battle Map Maker for D&D and VTTs
Making a good tabletop RPG map should not require installing a heavy desktop app, learning a complex tool, or spending an hour just to draw a simple d…
Your Own Push System Instead of FCM/APNs: When Is It Necessary?
Building Your Own Push Notification System: When Is It Necessary? With the advent of mobile applications, the importance of instant communication with…
Classes, Enums, and Records Look Like Simple Language Features — Until You Realize They Define Your Entire Domain Model
Classes, Enums, and Records Look Like Simple Language Features — Until You Realize They Define Your Entire Domain Model Why Senior .NET Engineers Spen…
I Got Tired of Bad Invoicing Tools So I Built My Own. Here's What Happened.
Every freelance developer I know has two things in common. They can build almost anything. And they absolutely hate doing their invoicing. I was no di…
How I Built a Python Backtesting Engine with 623 Tests
I spent the last year building a backtesting and live trading engine in Python. It started as a personal tool — I was tired of rewriting the same plum…
The Harness Is Now the Product
Has AI engineering just changed (again)? For the past year, most of us building with AI have been focused on one thing: getting better outputs from mo…
Electron App Icons: Cross-Platform Desktop Icon Mastery
Electron has democratized desktop application development by allowing web developers to build for Windows, macOS, and Linux using the technologies the…
Not Everything Needs a Subscription - Small manifesto against renting software
Why I'm building OlympStack — tools you own, for developers who run their own infrastructure. A small manifesto against renting software you'll use un…
Writing Code Is Now The Easiest Part
In the early years of my career, as a developer, my biggest problem was always an if condition or a complex JOIN query in PostgreSQL . In my eyes, the…
Governing AI Agents in Codebases Like a Linter
In this article, we introduce Agent Governance as Code , a framework for managing AI agents in software development projects. This approach applies th…
OSI Model in the Real World: From Your Browser to the Server
The OSI Model can feel theoretical in the classroom. But it describes something that happens billions of times every second all around you. Let's trac…
Why Visual Learning Beats Static Diagrams for OSI Mastery
The human brain is not a text-processing machine. It is, above all else, a visual processor . Neuroscientists estimate that approximately 65% of the p…
We Built an AI That Remembers Everything Your Team Forgets
How we turned Slack chaos into a living Knowledge Graph using LLMs, decay scoring, and graph theory: The $31 Billion Problem Nobody Talks About Fortun…
Technical Debt: The Silent Killer, A Project's Most Secret Cost
As I reached my thirties in my career, I realized that system crashes, full disks, or network outages weren't actually my biggest problems. The real k…
The Total Cost of Ownership Trap in Enterprise AI SaaS
The license fee is the number vendors want you to focus on. It's usually the smallest number in the real calculation. I've evaluated a lot of enterpri…
My VPS Crashed at 3 AM: A Sysadmin's Confession
A Mistake I Made Myself The most expensive mistake of my career wasn't a line of code; it was hitting a key at 3 AM saying, "Alright, this is done." R…
Your resume says "K8s." The job description says "Kubernetes." The ATS marks it as missing.
A senior engineer with five years of production experience ships a resume. React, TypeScript, AWS, Kubernetes: all of it real, all of it daily. Strong…
.NET Quizzes and Tiny Console Projects Look Beginner-Level — Until You Realize They Are Quietly Training You to Think Like a Systems Engineer
Why Senior .NET Engineers Respect Fundamentals More Than Most Developers Expect One of the biggest misconceptions in software engineering is believing…
How I Built a Production-Ready Multi-Tenant SaaS Boilerplate with MERN Stack
I got tired of starting from zero every time. Every project I worked on needed the same things — authentication, organizations, billing, admin panel. …
Load Balancing Explained - How Systems Handle Millions of Requests
There is a moment in the life of every growing system when a single server quietly becomes a bottleneck. At first, the system works exactly as expecte…
The Git & GitHub Guide I Wish I Had Before Losing My University Project
I Lost My University Project a Few Hours Before Demo Day — That’s How I Learned Git A few years ago, I learned one of the most important lessons of my…