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Johannes Kettmann

Building the React Job Simulator for (aspiring) Junior developers at profy.dev. React & Fullstack JS dev with 7+ years of experience.

Location Berlin Joined Joined on  Personal website https://profy.dev twitter website

Work

Teaching professional React at Profy.dev

Path To A Clean(er) React Architecture - A Shared API Client

Path To A Clean(er) React Architecture - A Shared API Client

1
Comments
5 min read

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React useEffect and objects as dependency - 4 approaches to avoid unnecessary executions

React useEffect and objects as dependency - 4 approaches to avoid unnecessary executions

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4 min read
React Code Review - Unraveling A Tightly Coupled Component & Mixed Responsibilities (Incl Video)

React Code Review - Unraveling A Tightly Coupled Component & Mixed Responsibilities (Incl Video)

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6 min read
React Riddles: The Mysterious Case of the Untracked Clicks

React Riddles: The Mysterious Case of the Untracked Clicks

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6 min read
You got the job! Now what? - Strategies to pass the probation period

You got the job! Now what? - Strategies to pass the probation period

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8 min read
Refactoring A Junior’s React Code - Reduced Complexity With A Single Source Of Truth

Refactoring A Junior’s React Code - Reduced Complexity With A Single Source Of Truth

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19 min read
Avoid These Common Pitfalls Of React useState (incl exercises)

Avoid These Common Pitfalls Of React useState (incl exercises)

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12 min read
Minimal TypeScript Crash Course For React - With Interactive Code Exercises

Minimal TypeScript Crash Course For React - With Interactive Code Exercises

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15 min read
Data Structures In Frontend JavaScript In The Real World (With React Code Examples)

Data Structures In Frontend JavaScript In The Real World (With React Code Examples)

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12 min read
Refactoring A Junior’s React Code - 43% Less Code With A Better Data Structure

Refactoring A Junior’s React Code - 43% Less Code With A Better Data Structure

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14 min read
Conditional Rendering In React - With A Focus On Readability And Clean Code

Conditional Rendering In React - With A Focus On Readability And Clean Code

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6 min read
React & REST APIs: End-To-End TypeScript Based On OpenAPI Docs

React & REST APIs: End-To-End TypeScript Based On OpenAPI Docs

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10 min read
Separate API Layers In React Apps - 6 Steps Towards Maintainable Code

Separate API Layers In React Apps - 6 Steps Towards Maintainable Code

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19 min read
REST APIs - How To Mutate Data From Your React App Like The Pros

REST APIs - How To Mutate Data From Your React App Like The Pros

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16 min read
REST APIs - How To Connect Your React App Like The Pros (Incl Detailed Example)

REST APIs - How To Connect Your React App Like The Pros (Incl Detailed Example)

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14 min read
How To Approach A React Pair Programming Interview (Not Only The Tech Skills Count)

How To Approach A React Pair Programming Interview (Not Only The Tech Skills Count)

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7 min read
Create a "Table of Contents" for your dev.to posts with one click

Create a "Table of Contents" for your dev.to posts with one click

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2 min read
Testing React Apps With Cypress: An In-Depth Guide For Beginners

Testing React Apps With Cypress: An In-Depth Guide For Beginners

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20 min read
How To Debug React Apps With VS Code - Boost Your Debugging Productivity

How To Debug React Apps With VS Code - Boost Your Debugging Productivity

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8 min read
Codebase Tour Through An Advanced React Project - How The Pieces Fit Together (incl video)

Codebase Tour Through An Advanced React Project - How The Pieces Fit Together (incl video)

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2 min read
React Coding Challenge Wednesday - Build A Pixel-Perfect Header (Incl Screencast)

React Coding Challenge Wednesday - Build A Pixel-Perfect Header (Incl Screencast)

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3 min read
Real-World React Coding Challenges For Your Interview Preparation

Real-World React Coding Challenges For Your Interview Preparation

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9 min read
Experienced Programmers Struggle As Well: Ease Your Imposter Syndrome As A Junior Developer

Experienced Programmers Struggle As Well: Ease Your Imposter Syndrome As A Junior Developer

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5 min read
How Professional (React) Developer Teams Plan & Estimate Features (incl screencast)

How Professional (React) Developer Teams Plan & Estimate Features (incl screencast)

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12 min read
Continuous Integration Pipelines with GitHub Actions for (React) Developers (incl screencast)

Continuous Integration Pipelines with GitHub Actions for (React) Developers (incl screencast)

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6 min read
Professional Git Workflow & GitHub Setup for (React) Developers (incl screencast)

Professional Git Workflow & GitHub Setup for (React) Developers (incl screencast)

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7 min read
How to set up a professional React project (including screencast)

How to set up a professional React project (including screencast)

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4 min read
Screaming Architecture - Evolution of a React folder structure

Screaming Architecture - Evolution of a React folder structure

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16 min read
The Most Popular React Tech Stack in 2022

The Most Popular React Tech Stack in 2022

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18 min read
Don't waste your time on a (React) portfolio website - 60+ hiring managers and a survey

Don't waste your time on a (React) portfolio website - 60+ hiring managers and a survey

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14 min read
Build an outstanding portfolio with these 3 React project ideas - Part 3

Build an outstanding portfolio with these 3 React project ideas - Part 3

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5 min read
Impress hiring managers by presenting your React projects like a pro - Part 2

Impress hiring managers by presenting your React projects like a pro - Part 2

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4 min read
How to build your React portfolio projects like a pro - Part 1

How to build your React portfolio projects like a pro - Part 1

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10 min read
Start using Git like the pros - A hands-on course for using Git in a team [FREE]

Start using Git like the pros - A hands-on course for using Git in a team [FREE]

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4 min read
Don't waste your time on a portfolio website

Don't waste your time on a portfolio website

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8 min read
Don't duplicate your data - Learnings from code reviews

Don't duplicate your data - Learnings from code reviews

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3 min read
An in-depth beginner's guide to testing React applications with React Testing Library

An in-depth beginner's guide to testing React applications with React Testing Library

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21 min read
Free like a freelancer or secure like an employee? There's a third option: The contractor

Free like a freelancer or secure like an employee? There's a third option: The contractor

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6 min read
Failing job interviews? No feedback to improve? Here's a technique to learn from rejections

Failing job interviews? No feedback to improve? Here's a technique to learn from rejections

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4 min read
Inside a dev's mind - Refactoring and debugging a React test

Inside a dev's mind - Refactoring and debugging a React test

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15 min read
Inside a dev's mind: How do you plan a UI feature?

Inside a dev's mind: How do you plan a UI feature?

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10 min read
Don't useEffect as callback!

Don't useEffect as callback!

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4 min read
Junior to Senior - Refactoring a dynamic multi-input component

Junior to Senior - Refactoring a dynamic multi-input component

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10 min read
React debugging session - Why is this function called hundreds of times?

React debugging session - Why is this function called hundreds of times?

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13 min read
How to accidentally mutate state. And why not to

How to accidentally mutate state. And why not to

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5 min read
Frustrating job search? 5 tips to better prepare for interviews

Frustrating job search? 5 tips to better prepare for interviews

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7 min read
Frustrating job search? My #1 tip for outstanding portfolio projects

Frustrating job search? My #1 tip for outstanding portfolio projects

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7 min read
Frustrating job search? Checklist for outstanding portfolio projects

Frustrating job search? Checklist for outstanding portfolio projects

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5 min read
Junior to Senior - Refactoring a React pan and zoom image component

Junior to Senior - Refactoring a React pan and zoom image component

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10 min read
Apollo hooks: Why and how to use

Apollo hooks: Why and how to use

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5 min read
Password-based authentication with GraphQL and Passport

Password-based authentication with GraphQL and Passport

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5 min read
4 ways to handle local state when using Apollo and GraphQL

4 ways to handle local state when using Apollo and GraphQL

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6 min read
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