Marcin Wosinek

@marcin-wosinek

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JavaScript developer

Valencia, SpainJoined July 2021

About

I'm JS developer with 13 years of professional experience. I'm always happy to teach my craft.

Available for

I'm available for mentoring JavaScript junior developers.

Marcin Wosinek's blogs

How to devhow-to.dev163 posts

conoce.devconoce.dev4 posts

poznaj.devpoznaj.dev3 posts

Articles Comments3

Recently published

MWMarcin Wosinekhow-to.devDec 22, 2025 · 2 min read

Changes in programming made possible with AI

I’ve been working in programming for the last 16 years. Let’s see what changes I see in our industry that are enabled by generative AI. Rapid prototyping The last few months, I’ve been working on a set of WordPress plugins, related to event organizat...

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MWMarcin Wosinekhow-to.devFeb 15, 2024 · 5 min read

Advantages of unit testing—with examples in Jasmine

Writing unit tests takes time and effort. Nonetheless, many teams insist on writing them anyway—that’s because of the benefits they bring to a project. Those benefits are mainly the following: fast feedback—unit tests speed up each iteration of twea...

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MWMarcin Wosinekhow-to.devFeb 8, 2024 · 5 min read

Pure functions and basic tests in Jasmine

Pure functions are the perfect case for unit testing. For a given input, we always expect the same output—there is no internal state involved. Let’s take a look at a few examples and some simple tests that check if the methods work as expected. Jasmi...

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MWMarcin Wosinekhow-to.devFeb 1, 2024 · 4 min read

How to prepare for a job interview

Let’s say you have a job interview in a few days. How should you prepare for it so that you can make an informed decision about joining the company, as well as make sure that your interests are taken care of? Prepare your questions An interview is a ...

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MWMarcin Wosinekhow-to.devJan 25, 2024 · 8 min read

How to build a demo project

Creating example projects is a common way of showing your skills to potential employers. Let’s take a look at what’s important to keep in mind when building personal projects with an eye toward impressing prospective employers. Simplicity Building ap...

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Marcin Wosinek

About

Available for

Marcin Wosinek's blogs

Recently published

Changes in programming made possible with AI

Advantages of unit testing—with examples in Jasmine

Pure functions and basic tests in Jasmine

How to prepare for a job interview

How to build a demo project

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Marcin Wosinek

About

Available for

Marcin Wosinek's blogs

Recently published

Changes in programming made possible with AI

Advantages of unit testing—with examples in Jasmine

Pure functions and basic tests in Jasmine

How to prepare for a job interview

How to build a demo project