𝗝𝗼𝗵𝗻

Full‑stack developer creating fast, modern, and refined applications. I focus on simplicity, performance, and real value for users.

Poland Joined on Apr 9, 2026 janretka.freelance@gmail.com https://github.com/johnnylemonny

Education

WIT Academy in Warsaw

Work

Independent developer, focusing on web projects

𝗝𝗼𝗵𝗻

Sep 15

Stop Using JavaScript for Every Popover: Modern HTML and CSS Can Do More Than You Think

#css #webdev #html #tutorial

10 min read

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𝗝𝗼𝗵𝗻

Sep 4

I Used an AI Agent to Test an Open-Source TypeScript Tool and Found a Real Bug

#opensource #typescript #debugging #ai

3 min read

𝗝𝗼𝗵𝗻

Aug 27

AI Agent Plugins Just Got a Shared Standard. Here’s Why Developers Should Care

#ai #programming #opensource #tooling

11 min read

DEV Weekend Challenge: Dog Days Edition Submission 🐕

𝗝𝗼𝗵𝗻

Aug 16

CanisVision: See and Sense the World Through Your Dog's Eyes

#devchallenge #weekendchallenge #ai #webdev

4 min read

𝗝𝗼𝗵𝗻

Aug 13

Stop Parsing AI Text: Build Reliable Features with Structured Outputs

#ai #programming #webdev #tutorial

10 min read

Frontend Challenge Perfect Landing Submission 🍲🥧

𝗝𝗼𝗵𝗻

Aug 11

Smakosz: Modern Polish Comfort Kitchen — Awwwards-Tier Dining Experience 🍽️✨

#devchallenge #frontendchallenge #webdev #javascript

2 min read

Frontend Challenge CSS Art Submission 🍲🥧

𝗝𝗼𝗵𝗻

Aug 11

Żurek: A Bowl of Polish Soul - 100% Pure CSS Art 🍲

#frontendchallenge #devchallenge #css

2 min read

𝗝𝗼𝗵𝗻

Aug 5

Your README Is for Humans. Your AGENTS.md Is for Coding Agents

#ai #programming #productivity #devtools

10 min read

𝗝𝗼𝗵𝗻

Jul 28

A Small Change to Your AI Coding Workflow: Ask for the Plan First

#ai #programming #productivity #tutorial

10 min read

𝗝𝗼𝗵𝗻

Jul 22

I Tried Vite+ Beta: Can One Tool Replace Your Frontend Toolchain?

#vite #webdev #javascript #tooling

8 min read

𝗝𝗼𝗵𝗻

Jul 14

7 New JavaScript Features in ECMAScript 2026 That Replace Everyday Workarounds

#javascript #webdev #programming #node

8 min read

DEV Weekend Challenge: Passion Edition Submission

𝗝𝗼𝗵𝗻

Jul 11

Passionaut: Turn Any Passion into an AI-Generated 3D Knowledge Atlas

#devchallenge #weekendchallenge #threejs #nextjs

8 min read

𝗝𝗼𝗵𝗻

Jul 9

Next.js Finally Fixed Caching (And My Database Is Sighing in Relief)

#webdev #nextjs #react #javascript

3 min read

𝗝𝗼𝗵𝗻

Jul 1

Stop Over-Optimizing Performance: The Modern Full-Stack Toolkit in 2026

#webdev #javascript #react #architecture

3 min read

𝗝𝗼𝗵𝗻

Jun 23

Stop Paying for GitHub Copilot: Build a Free, 100% Private AI Assistant Locally

#ai #productivity #tooling #webdev

3 min read

𝗝𝗼𝗵𝗻

Jun 16

Beyond Code Autocomplete: How to Build a Modern Agentic Workflow in 2026

#webdev #ai #productivity #architecture

3 min read

𝗝𝗼𝗵𝗻

Jun 4

AI Can Build Your UI — But Can It Maintain It?

#ai #webdev #frontend #productivity

3 min read

𝗝𝗼𝗵𝗻

Jun 2

Accessibility Is Not a Lighthouse Checkbox

#a11y #webdev #html #frontend

3 min read

𝗝𝗼𝗵𝗻

May 28

CSS Got Good While You Were Installing More Libraries

#css #webdev #frontend #design

3 min read

𝗝𝗼𝗵𝗻

May 26

TypeScript Won — Now Stop Using It Like Fancy JavaScript

#typescript #javascript #webdev #programming

3 min read

𝗝𝗼𝗵𝗻

May 26

Cabal for Android: My First Native Kotlin P2P Chat App Reaches Its First Early Version

#kotlin #android #opensource #p2p

4 min read

𝗝𝗼𝗵𝗻

May 21

Next.js Caching Is Hard Because You’re Thinking About It Too Late

#nextjs #react #webdev #performance

3 min read

𝗝𝗼𝗵𝗻

May 19

React Is Not the Problem — Your Client-Side Mental Model Is

#react #webdev #javascript #performance

3 min read

𝗝𝗼𝗵𝗻

May 14

Stop Shipping 700KB of JavaScript for a Button

#webdev #performance #javascript #frontend

4 min read

𝗝𝗼𝗵𝗻

Apr 30

The AI Code Review Checklist I Use Before Merging Any TypeScript PR

#ai #typescript #webdev #productivity

6 min read

𝗝𝗼𝗵𝗻

Apr 22

How I Started Learning Kotlin by Building a Real Android App

#kotlin #android #beginners #mobile

6 min read

DEV Weekend Challenge: Earth Day

𝗝𝗼𝗵𝗻

Apr 18

NatureNode: An AI-Powered Biodiversity Research Tool for Earth Day

#devchallenge #weekendchallenge

3 min read

𝗝𝗼𝗵𝗻

Apr 16

5 Developer Trends That Actually Matter in 2026 (Not Just the Hype)

#ai #github #webdev #security

6 min read

𝗝𝗼𝗵𝗻

Apr 13

How to Build a Public Open-Source Project People Actually Want to Clone, Use, and Contribute To

#opensource #github #webdev #devops

6 min read

𝗝𝗼𝗵𝗻

Apr 13

Working on Cabal v3: reviving a P2P mobile chat app with React Native

#reactnative #android #opensource #mobile

2 min read

𝗝𝗼𝗵𝗻

Apr 11

From NASA Exoplanet Query to ExoVault: Building a Better Data Exploration Experience

#opensource #webdev #astro #typescript

3 min read

𝗝𝗼𝗵𝗻

Apr 11

From a Calorie Counter Prompt to a Local-First Nutrition Tracker

#opensource #webdev #react #buildinpublic

3 min read

𝗝𝗼𝗵𝗻

Apr 10

I Built a Free Hydration Tracker with No Signup: Here’s What I Learned

#showdev #webdev #react #typescript

3 min read