Hi Jakub !

I took a 5 min look with my designer eyes, bc i'm not your targeted audience. Anyway, here are some ideas :

Firstly, I think you should choose a more appealing CTA (instead of Sign In) and place this one on top right instead of left.

Also, let your design breath ! It really feels crowded.

I don't really understand the point of the live demo of your portfolio.

You should redefine your main call to action and focus on converting your visitor, it seems like you don't have a clear direction (it's normal for now but please talk with your users and be more precise).

The landing page feels really short and considering your type of product, you should seem more reliable, add social proof and safety guarantees. I don't know how it works but If I had to input some confidential information, I'm not sure I'll be feeling safe.

Talking about your user ? Who is your user ? What are his pain points ? What is the problem you are trying to solve.

Finally, I think you have a good positioning by choosing to be the simple alternative so focus on this simplicity in your messaging, branding and design. KISS :)

I think there is still a lot to say, so hmu if you need an in depth analysis. Keep working dude, and don't hesitate to hit me up ([email protected]) if you want me to help you with product design ;)