Overview

Delivering world-class fintech design that drives activation, retention and investor confidence

Fintech Product Design

UX Research

Mobile UX & UI Design

Design Systems

Activation & Retention

Highlights

Mission-driven fintech backed by Fenway Sports Group, The Kraft Group, and Social Change Fund United
NBA and WNBA partnerships across four major US cities, driving financial wellness in underserved communities
Nearly $800K invested back into the Black community through seeded accounts, scholarships, and grants
A fast-growing product team ready to level up their app from MVP to a world-class fintech experience

What we did

Systematic redesign of the entire mobile app to compete with top-tier fintech products
Data-driven UX that moved activation and retention, not just pixels
Investor decks, marketing collateral, and partnership assets that matched the product's ambition
18+ months embedded in the product team, scaling up or down as the startup needed

Working with Lumi has meant that we have access to more resources... and a great flexible relationship because we're not at the place where we need a full-time designer on board.

Larysa King

VP Product, Stackwell Capital

The Brief

Building trust through design when your mission is eliminating the wealth gap

Stackwell Capital isn’t just building just another investing app. They are on a mission to eliminate the racial wealth gap by making wealth-building accessible, educational, and achievable for underserved communities.

The stakes are high. Every screen needed to build trust with people who'd been failed by financial institutions before. Every interaction needed to make investing feel achievable, not intimidating. Every visual choice carried the weight of Stackwell's mission.

But Stackwell couldn't justify hiring a full-time team capable of delivering on the vision just yet. They needed world-class design thinking without the overhead – someone who could move at startup speed, understand fintech complexity, and amplify the product, not just maintain it.
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Our Solution

A design partner that thinks like your team, works at your pace, and delivers beyond the brief

At Lumi, we believe in becoming an extension of your product team. With Stackwell, this meant embedding directly into their development rhythm: working in their tools, syncing weekly on priorities, staying connected, and flexing capacity to match the reality of startup life.

Our approach

From day one, we integrated into Stackwell's product team as if it were our own. Weekly syncs kept priorities aligned. Monthly capacity flexed with actual needs – critical when product priorities shift between rapid development and slower planning.

When priorities shifted mid-sprint, the work shifted with them. When team members transitioned, we maintained continuity.

There's been a lot of changes in a year. People have come and gone, their role has shifted. Lumi has been a constant that has always adapted with us with our changing needs.

Larysa King
VP Product, Stackwell Capital

Our Process

1. Building the foundation for scale

→ Created and maintained a comprehensive design system that accelerates development and provides consistency

→ Enabled Stackwell's dev team to ship features faster with confidence the experience stays cohesive

→ Rolled out accessibility compliance across the product, critical for a platform serving diverse communities

→ Built a scalable foundation that grows with the product without constant designer intervention

2. Redesigning the mobile experience strategically

→ Leading a systematic redesign of the entire mobile app, modernising the experience without the chaos of a full product pause

→ Working closely with Stackwell's technical team on implementation and creative team on direction

→ Reimagining information architecture, interaction patterns, and visual language one sprint at a time

→ Moving the app from MVP aesthetic to the polished, intuitive experience users expect from financial products they trust

3. Grounding UX decisions in data, not assumptions

→ Reviewed every aspect of the app through the lens of real user behavior

→ Analysed metrics and customer feedback Stackwell collected to identify friction points

→ Redesigned flows that moved business KPIs

→ Delivered design improvements that functioned as growth levers, not just aesthetic upgrades

→ Knew when to follow established patterns and when to push beyond them

4. Creating features that become calling cards

→ Transformed Stackwell's "Playlists" educational feature from generic learning modules into a visually striking experience

→ Knew when to follow established patterns and when to push beyond them

→ Proved that Stackwell's design execution matched their mission

The visual style is very striking. As we've shown different people, even investors, they've just loved seeing the look and feel of it. The design was very much inspired by Lumi

Larysa King
VP Product, Stackwell Capital

5. Supporting the business beyond the product

→ Created investor presentations that communicated Stackwell's vision with clarity and impact

→ Developed marketing collateral that spoke to their audience with authenticity

→ Designed partnership assets that positioned Stackwell as a serious player in fintech

The Results

A partnership that accelerates everything

Built a comprehensive design system that accelerates development and ensures a cohesive, accessible experience at scale

Systematically redesigned the mobile app from MVP aesthetic to a polished experience to compete with top-tier fintech products

Reduced friction at critical moments through data-driven UX decisions that improved activation and retention

Scaled flexibly as a design partner through team changes and product pivots across 18+ months of startup growth

Two things that are important to being successful for us. One is flexibility, because of the stage of startup that we're at, and the second is the quality of work.

Larysa King
VP Product, Stackwell Capital

After 18+ months partnership – through feature launches, team changes, product pivots, and all the intensity of building a mission-driven startup – Stackwell now has:

A product that scales without breaking: The design system enables their dev team to ship features faster while maintaining the cohesive, accessible experience users expect from financial products they trust
A mobile app evolving toward world-class: Through systematic redesign work, Stackwell's app is shedding its MVP aesthetic and stepping into the modern, polished experience that competes with top-tier fintech products
UX grounded in real user behavior: Data-driven design decisions reduced friction at critical moments in the user journey
A standout feature that tells their story: The Playlists feature became proof that Stackwell's design execution matched their mission – compelling enough to anchor investor conversations
Marketing and business assets that support growth: From pitch decks to partnership materials, Stackwell has the design support startups need at every stage
A design partnership that actually works: A flexible capacity model that scales with their needs, embedded workflows that eliminate friction, and consistent quality delivered at startup speed

Next up

Vuoly

Designing and building a global web e-commerce platform

Lumi has flexed with us and with our needs over time and has the skillset to be able to adapt to different styles and requests very quickly. In a startup environment, that's extremely valuable

Larysa King

VP Product, Stackwell Capital

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