Julie NaEun Kim | Senior Product Designer — Fintech
cardmeleon · concept

Virtual Cards

Giving users more control over subscriptions through flexible virtual cards.
Company

Nanopay

Role

Product Designer

Year

2021

Type

Consumer Fintech · Virtual Cards

Company

Nanopay

Role

Product Designer

Year

2021

Type

Consumer Fintech · Virtual Cards

Cardmeleon was a customer-facing virtual card product designed to help users manage recurring subscriptions and everyday expenses with more control.

I worked across product design, UI/UX, design system, and brand identity, helping shape nanopay’s first customer-facing application from early product direction through detailed experience design.

The product was ultimately not released due to card-provider constraints.

Nanopay’s Back Office was the operational hub for customer support, onboarding, and payment operations. As the platform grew, critical information became increasingly difficult to find, workflows became fragmented, and teams relied on manual searching to complete everyday tasks.

I led the redesign across research, information architecture, interaction design, and phased delivery—improving how operations teams navigated accounts, transactions, and onboarding work while working within limited engineering capacity.

01 — The problem

One card was being asked to do too much

Managing subscriptions across multiple services meant repeatedly sharing and storing the same payment credentials across different platforms.

Users had limited control over how individual merchants could charge them, making recurring payments harder to manage independently.

The opportunity was to give users more granular control over where, when, and how much could be charged.

02 — the product vision

A virtual card for each spending need

The product was designed around flexible virtual cards that could be created for either recurring subscriptions or one-time purchases.

Users could:

  • Create dedicated virtual cards

  • Set spending limits

  • Define payment schedules

  • Review transactions

  • Manage or update cards as their needs changed

The goal was to turn the card itself into a control layer between the user and each expense.

03 — The constraints

Designing Nanopay’s first customer-facing product

Nanopay’s existing expertise was primarily in backend financial infrastructure, making Cardmeleon its first significant customer-facing application.

That meant close collaboration with Engineering was especially important as we translated new interaction patterns and UI requirements into the product.

At the same time, the experience depended on finding a card provider that could support the required functionality—a constraint that ultimately prevented the product from launching.

04 — the solution

More control at the card level

I designed the experience around making individual virtual cards easy to create, understand, and manage.

Each card could represent a specific subscription or spending purpose, allowing users to separate expenses rather than relying on a single payment credential across every service.

The experience brought together:

  • Card creation and controls

  • Spending limits and schedules

  • Transaction visibility

  • Subscription and expense management

  • A dashboard for understanding activity across cards

The product direction focused on giving users clear, direct control without adding unnecessary financial complexity.

Card-level control across subscriptions and expenses
Virtual cards, spending controls, transaction visibility, and account management brought into one experience.

05 — branding

Building a consumer identity around flexibility

Because Cardmeleon was nanopay’s first customer-facing product, the work also required a distinct consumer brand.

I created the Cardmeleon name by combining card and chameleon, using adaptability as the central brand idea.

That concept informed the logo, visual identity, and flexible color system—giving individual cards their own personality while keeping the overall product cohesive.

The branding became a supporting layer of the product rather than a separate exercise: the visual system reinforced the idea that each card could adapt to a different purpose.

From card + chameleon to Cardmeleon
The identity combined the adaptability of a chameleon with the form of a payment card.

A flexible visual system for a flexible card product
Neutral foundations allowed individual cards and subscription categories to take on distinct visual identities.

Extending the identity beyond the product
Early marketing explorations carried the adaptable visual language into launch concepts.

06 — design outcome

A complete product foundation, despite an unreleased launch

Cardmeleon established the product and design foundation for a new type of customer-facing experience at nanopay, spanning product flows, card management, dashboard patterns, design system, and brand identity.

Although the product did not launch because the required card-provider partnership could not move forward, the work demonstrated how nanopay’s financial infrastructure could translate into a more approachable consumer experience.

Key Insight

Giving users more control didn’t require adding more financial tools—it meant making each payment relationship easier to isolate and manage.

Open to complex systems, ambitious
products, and thoughtful teams.

julie.naeun.kim@gmail.com

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©2026 Julie Kim

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