Tweener

France

2025

UX/UI design of a mobile app

Tweener app mockups on smartphones — fantasy tennis screens

Project scope

Redesigning existing screens, designing new features and game modes, building a component system, working with the development team, ongoing collaboration since July 2025.

Redesigning existing screens, designing new features and game modes, building a component system, working with the development team, ongoing collaboration since July 2025.

Over a year of ongoing collaboration

The collaboration began with a short trial assignment for 5 screens. After it was completed, the client decided to continue — since then, the project has been ongoing without interruption, with the scope and budget regularly expanding.

The only designer on the product team

Since the beginning of our collaboration, I have been responsible for the entire UX/UI design of the app — from redesigning existing screens, through new features, to the component system and marketing materials.

From redesign to new features

The scope of our collaboration gradually expanded: from adapting the old screens to the new visual style, through designing new game modes, to independently proposing UX improvements that influenced product development.

Player selection screen in the Tweener app

Fantasy tennis league screen in the Tweener app — a list of matches with predictions and results

Overview/

Tweener: long-term UX/UI collaboration on a fantasy tennis app

Tweener is a fantasy sports mobile app where users create tennis lineups and compete in leagues. The product operates in the European and American markets, has an active user base, and is developed by a team from France.

Tweener is a fantasy sports mobile app where users create tennis lineups and compete in leagues. The product operates in the European and American markets, has an active user base, and is developed by a team from France.

I joined the project as the only designer, initially as part of a short trial assignment. After a successful delivery, the collaboration was expanded and has continued ever since — covering the redesign, new features, a component system, and ongoing support for the development team.

I joined the project as the only designer, initially as part of a short trial assignment. After a successful delivery, the collaboration was expanded and has continued ever since — covering the redesign, new features, a component system, and ongoing support for the development team.

Friends invitation screen for a league in the Tweener app

Business Needs/

Business needs and project goals

The app had a functional but outdated interface that did not match the new visual direction developed by the illustrator. The team needed a designer who would translate the existing screens into the new style while also ensuring the system remained consistent, readable, and scalable.

The app had a functional but outdated interface that did not match the new visual direction developed by the illustrator. The team needed a designer who would translate the existing screens into the new style while also ensuring the system remained consistent, readable, and scalable.

As the product evolved, new needs emerged: designing entirely new game modes, handling payments and deposits, improving key user journeys, and creating marketing materials — all as part of a single ongoing collaboration.

As the product evolved, new needs emerged: designing entirely new game modes, handling payments and deposits, improving key user journeys, and creating marketing materials — all as part of a single ongoing collaboration.

Problems and solutions

Problem

The application had about 40 screens in the old visual style that needed to be moved to the new visual direction — without losing functionality and while maintaining consistency across all screens.

Solution

Instead of simply "carrying over" the graphics, a system of components and reusable UI elements was built, which makes it possible to create new screens faster and implement changes more easily in the future. This approach was appreciated by the client and adopted as the standard for future work.

Problem

As the product evolved, there was a need to design a completely new game mode with support for payments, deposits, and availability conditions depending on the user’s country — an area that requires particular care in UX.

Solution

A complete flow for the new mode has been designed, taking into account different availability states, payment logic, and clear communication of the terms. The entire process has been prepared in a separate Figma file, ready to be handed over to developers.

Problem

Dense and information-heavy app screens—such as standings tables, league cards, or player selection screens—made it difficult for users to quickly understand information and make decisions.

Solution

The information hierarchy on key screens was redesigned, simplifying the structure and improving readability without removing functionality. Clarity of communication was the priority—especially important in a context where users make quick decisions.

Tweener app in hand — fantasy tennis league screen with a list of matches

Tweener match cards — Carlos Alcaraz vs Frances Tiafoe with tennis graphics

RESULTS/

Trust that leads to ongoing cooperation

A collaboration that started with a 5-screen test assignment has continued uninterrupted for over a year — with the scope of responsibilities and budget regularly expanding.

As part of the project, dozens of screens were designed in a new visual style, a UI component system was built, new game modes were designed, and marketing materials were prepared — all in ongoing collaboration with the development team.

As part of the project, dozens of screens were designed in a new visual style, a UI component system was built, new game modes were designed, and marketing materials were prepared — all in ongoing collaboration with the development team.

Tweener

Tweener

Project scope

Redesigning existing screens, designing new features and game modes, building a component system, working with the development team, ongoing collaboration since July 2025.

Over a year of ongoing collaboration

The only designer on the product team

From redesign to new features

Overview/

Tweener: long-term UX/UI collaboration on a fantasy tennis app

Tweener is a fantasy sports mobile app where users create tennis lineups and compete in leagues. The product operates in the European and American markets, has an active user base, and is developed by a team from France.

I joined the project as the only designer, initially as part of a short trial assignment. After a successful delivery, the collaboration was expanded and has continued ever since — covering the redesign, new features, a component system, and ongoing support for the development team.

Business Needs/

Business needs and project goals

The app had a functional but outdated interface that did not match the new visual direction developed by the illustrator. The team needed a designer who would translate the existing screens into the new style while also ensuring the system remained consistent, readable, and scalable.

As the product evolved, new needs emerged: designing entirely new game modes, handling payments and deposits, improving key user journeys, and creating marketing materials — all as part of a single ongoing collaboration.

Problems and solutions

Problem

Solution

Problem

Solution

Problem

Solution

RESULTS/

Trust that leads to ongoing cooperation

A collaboration that started with a 5-screen test assignment has continued uninterrupted for over a year — with the scope of responsibilities and budget regularly expanding.

As part of the project, dozens of screens were designed in a new visual style, a UI component system was built, new game modes were designed, and marketing materials were prepared — all in ongoing collaboration with the development team.

Let's talk about your website.

Schedule a free consultation.Tell me about your business, and I’ll suggest a specific solution, with no obligation.

First and last name*

Email*

Message

Let's talk about your website.

Schedule a free consultation.Tell me about your business, and I’ll suggest a specific solution, with no obligation.

First and last name*

Email*

Message

Let's talk about your website.

Schedule a free consultation.Tell me about your business, and I’ll suggest a specific solution, with no obligation.

First and last name*

Email*

Message

Schedule a free consultation.
Tell me about your business, and I’ll suggest a specific solution, with no obligation.

Schedule a free consultation.
Tell me about your business, and I’ll suggest a specific solution, with no obligation.

Schedule a free consultation.
Tell me about your business, and I’ll suggest a specific solution, with no obligation.