Although you specifically asked for a resume, in Germany a cover letter is pretty common (not sure about where you live). There have been some good suggestions about the resume already.
When I get applications I actually value the cover letter more than the CV, especially if the CV doesn’t fit the open position (as in „no experience in the required technologies“). In that case, i want to see the person is passionate about SW development and can explain why. A reason why the job offer is interesting would be a bonus, but only if it’s the truth. for me I would rather hire a good developer without a deep love for the domain than the other way around.
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