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Make the right calls when investing in stocks, forex and cryptocurrencies.

I designed the Harbinger web application.




Web Application

Project type

Product Design







Your dealership. Digital!

the team & my role


Product Manager

Product Owner



For 4 months I lived and worked in Anvers, Belgium with the Carflow team, coordinating the redesign efforts with the marketing, development and local design team.


Harbinger provides you with the means to make the right calls when investing in stocks, FOREX and cryptocurrencies.

You will have access to market moving news streaming in real-time, as well as analysis tools for determining precedents of current events.

You decide the best course of action. Make informed decisions using Harbinger or get up to speed with economics using our free intuitive tools.


Carflow is a web application that allows hundreds of dealeships across Belgium, Netherlands and Luxembourg to manage, coordinate and promote their inventory.


what are we trying to do here?

for the business

Testing a new service that would allow Minutizer to expand their offering. In line with the brand vision, navigating a blue ocean for now and trying to get the necessary intel to develop a sustainable new revenue stream.

for the customers

Make it easier for current customers to charge for the extra time spend with clients offering services via phone. Allowing others to offer more by consulting or entertaining using their voice.


As a consultant I want to be able to monetize the time I spend with my clients. Doing it via phone comes more natural to 30+ yr old customers that haven’t made yet a solid connection with Skype.


There was no existing market at the time for such a service. The benefit was sailing on a pretty blue ocean, but being pioneers meant we had plenty of hurdles ahead.


the design timeline


Why are we doing this?

My collaboration with Minutizer spread across 3 years, I was familiar with their product. But this was a new market.

I began with individual interviews with the CEO and CTO to gather the vision and expectations regarding the product and make sure it’s feasible from a tech perspective.

What you could find in the app store were apps that had a built in VoIP service that could be used as a reference for charging.

User research was informed by support requests gathered by the customer experience team and informal live chats at two of the events that I attended, together with the marketing team.

So who were we going to serve?

The original assumption went towards those that were not currently charging for the consulting done via phone. But it turns out that those that were already doing it, albeit in a less precise manner were the ones that would give our solution a solid shot.

As mentioned above, this was a blue ocean: no solid competition in sight.




How will we do it?

The app was not going to be actively promoted. Only a couple of hundreds of users would use it, a very small percent of Minutizer’s pool of clients.

Our intent was to get as much intel as we could about user’s needs, expectations, use cases and behaviors. We could not have done that without an actual product.

The smartphone client would connect to the service via a dedicated API, and when triggered by an incoming call would search the caller in our database to validate it’s standing in the system: is it a member, does it have enough funds?

Since we were aligned, I came back with a set of flows meant to cover the various scenarios we wanted the app to offer.

Also connected with the CTO and made sure the API accounted for connections from Android clients.






What should we deliver?

After three iterations we clarified the basic flows and set of features we would provide the users with, and I proceeded with sketching the wireframes for the main screens of the application. There were plenty of questions to answer. Browsing Google Play, seeking similar apps that allow call duration tracking did not yield encouraging results.

Thus, finding a developer willing to take on the challenge of logging calls on Android was not easy. Trying to minimize costs led us to consider enlisting the services of a freelance developer. There were 3 weeks with no visible progress. We had to move the needle, so we went back to looking for a better solution and an increased budget.

After weeks of searching, the negotiations with a brave development company were completed and I went ahead and shared the specifications that were solid, up to that point. We had a kickoff meeting and agreed on a development calendar. The initial estimate meant that the app would be ready to launch within 3 months.

They started developing a skeleton for the app based on the wireframes and also the research regarding hooking onto incoming and outgoing phone calls in order to log them and track their duration. Having received validation from all the stakeholders (now including a tech representative from the developer) I proceeded with the visual design of the interface.




Does it work?

I remained in the project to oversee the implementation of the app and also acted as a second layer of QA, on behalf of my client. Managing a project with technical conundrums is not a comfortable role. It wasn’t easy to to balance expectations and patience to reach the end.

Towards the end of the fall we published the first stable RC (release candidate) and in December, after ~6 weeks of iterations we had a solution that covered most of our initial goals.

A group of 10 beta testers were the core source for feedback and input on how to improve both the application and the service on the whole.


what we brought to life

DESIGN Duration

25 weeks




Expert Network

still curious, eh?

You can give it a go, it’s still available for download and install,

but keep in mind it’s not a supported product.



for me

2h+ live meetings are a curse for all involved, no matter how passionate they may be about their vision. People loose focus and if lunch should follow, more irritable and prone to make decisions they would not otherwise do. Make sure you have specific topics in mind and timebox the discussions for each. Landing pages and dashboards should be done last. They are like black holes: they suck so much attention and energy if you lack input from actual users or analytical browse data. not taking feedback personally if it’s delivered with the heat of a 1000 suns

for my client

The MVP test ran for a little over one year. It was meant to be gauge user behavior, expectations, surface special needs and the insights drawn from this experiement led to Minutizer’s expansion of its offering: phone call charging. Now you do not need to install an application on your phone and also your phone number remains private.

how about you?

User eXperience design

How the product works, how it feels when you use it and how it meets your needs and expectations.

User Interface design

How the product looks like: colors, fonts, shapes, animations and transitions.


How the product looks like: colors, fonts, shapes, animations and transitions.

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