der, die oder das Softwareentwickler?

der Softwareentwickler

It's der Softwareentwickler. Softwareentwickler is masculine, plural die Softwareentwickler.

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Example

Softwareentwickler

Usually 81.3% of the 2,315 common nouns ending in -er take der.

Many -er nouns are masculine, most of all people and machines that do something: der Lehrer, der Computer.

Exceptions die Mutter, die Tochter, die Schwester, das Wasser

Softwareentwickler der

The last part decides the article: der Entwickler, so der Softwareentwickler.