Task 1. Sign up journey

First of all I would discover where exactly drops off are happening. I would colloborate with data scientist, divide onboarding funnel into steps and then see how many people are completing each step (example):

From here, the metrics are pretty simple - we're looking for changes in the % of people moving through onboarding flow as changes are making.

It's worth using a tool such as a cohort analyser to check short-term wins against long-term effects such as average lifetime value (the rationale being that adding or removing a step to an onboarding flow could impact someone's likelihood to churn 2-3 months down the line, even if they're behaving as we expect now).

Also, I would like to use some session recording tools like Inspectlet. If it's impposible to connect with data scientist I would use something like Mixpanel: tool that analyse where exactly users drop off.

Then, I would go through usability improving hypothesis-driven process.

Task 2.

After reviewing the original requirements below, we want you to provide feedback of the design. User flow, information architecture, structure, visuals, …

Usally, to analyse productivly user interface you need to test it. Then, you can start searching main UX Pain Points, for example using 10 Usability Heuristics for User Interface Design:
- Visibility of system status
- Match between system and the real world
- User control and freedom
- Consistency and standards
- Error prevention
- Recognition rather than recall
- Flexibility and efficiency of use
- Aesthetic and minimalist design
- Help users recognize, diagnose, and recover from errors
- Help and documentation

After this step, you can move to setting up main pain points, prioritise them using a matrix, choose the right one and make a hypothesis, make it measurable and choose kpi.

As I don't have all this information and can't see the whole flow. I can say only subjectivly and theoretically.
Current interface looks poor and unfriendly, it doesn't seem smooth in a flow. It has several interface errors such as duplicating unnecessary information, it contains information which is irrelevant or rarely needed, it doesn't speak "user" language, space is filled unevenly, design is not careful. Design could be improved.

Task 3.

Quickly created simple greyscale mockups:

UI needs to be light because people who are working with such tools spend a lot of time near computer, so it doesn't have to bother them. As it was not required in a task to save style and UI components I changed it:

You can check out Prototype here