Overview

Delivering fintech UX that drives activation, retention, and investor confidence

Digital Product Design
Mobile UX & UI Design
UX research

Design Systems
Activation and Retention

Design for climate tech startup MapMortar

Challenges

No dedicated design resource to match the pace and complexity of building a mission-critical fintech product
Inconsistent user experience across the app, eroding trust with users who'd been burned by financial institutions before
No design system to support rapid, scalable development
Limited capacity to create marketing, investor, and partnership materials that matched product ambition

With Lumi

An evolving mobile app being systematically redesigned to compete with top-tier fintech products
Data-driven UX improvements reducing friction and driving activation and retention
Marketing, investor, and partnership assets supporting growth at every stage
A trusted design partner embedded in their product team, scaling capacity with their needs

The Challenge

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

Stackwell Capital isn’t 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 were 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.

Their previous design relationship wasn't quite working. But Stackwell couldn't justify hiring a full-time senior designer 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.

"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 of Product, Stackwell Capital

Testimonial video from Rapidream CEO Yedid Herskovitz

The 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... but we've just managed to keep having open communication when there's problems.

- Larysa King, VP of Product at Stackwell Capital

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

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

Grounding UX decisions in data, not assumptions

This iterative approach meant the team could move seamlessly from concept to execution, equipping them with a product that grows with real user needs as they evolve.

Defining and growing the brand

As we worked on shaping MapMortar’s MVP, the need for a strong, cohesive brand identity goals emerged – something that appealed equally to their diverse audience while reflecting their bold mission to decarbonise the built environment.

→ Brand identity: We worked on a modern, approachable visual brand that communicated trust, ambition, and impact

→ Website design: We designed and built a polished, user-focused website to capture the attention of investors and potential clients

→ Pitch decks and collateral: From investor presentations to conference banners, we created materials that clearly communicated MapMortar’s value, helping them secure funding and build their reputation in the industry

We get a lot of compliments on how the software looks – it usually isn’t pretty in the built environment!

- Josephine Bromley, COO, MapMortar

The Results

Funding secured, brand established, and a product that answers real user needs

Highlights

Secured significant pre-seed funding with our collaborative MVP, branding, and pitch deck work

Drove continuous product evolution through client feedback and iterative development

Established professional brand identity that resonates with both corporate clients and startups

Created intuitive data visualization that transforms complex metrics into actionable insights

We believe success isn’t just about delivering a product – it means working with our partners to help them thrive. For MapMortar, that meant transforming a bold idea into a trusted, market-ready solution, and we couldn’t be prouder of what we’ve achieved together:

From day one, we made sure the development team had a crystal-clear understanding of the product’s functionality and roadmap. This clarity allowed them to hit the ground running
With the MVP in hand, MapMortar shifted from pitching a concept to delivering real, measurable value to their clients. With strategic branding, the team were able to reach exciting new partnerships as well as meaningful conversations with investors and industry leaders
Fast-forward to three years later and MapMortar has secured prestigious clients and pilots, successfully raising funding in a difficult landscape.

If you’re looking for a strategic partner to help your product reach its full potential, let’s talk.

We were absolutely delighted with the outcomes. Lumi delivered everything we had hoped for and more, as they also taught us about the product development methodology they had employed and pushed us to prioritise features and our ideas. Our customers loved the wireframes and off the back of them, we are much closer to moving some customers towards paying for our MVP.

Josephine Bromley

COO, MapMortar

👋

30m Intro

🤝

Deep dive

🚧

First project

Building something great? Let's talk

Item: Lumi Studio
Rating: 5
Author: Josephine Bromley

Meet for 30 minutes with one of our founders. Dive right in and see if we're a good fit.

Book a Call

Talk to our founder

Explore

Get Started

Stackwell

Delivering fintech UX that drives activation, retention, and investor confidence

Challenges

With Lumi

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

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

Our approach

Building the foundation for scale

Redesigning the mobile experience strategically

Grounding UX decisions in data, not assumptions

Defining and growing the brand

Funding secured, brand established, and a product that answers real user needs

Highlights

Building something great? Let's talk

Explore

Get Started

Stackwell

Delivering fintech UX that drives activation, retention, and investor confidence

Challenges

With Lumi

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

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

Our approach

Building the foundation for scale

Redesigning the mobile experience strategically

Grounding UX decisions in data, not assumptions

Defining and growing the brand

Funding secured, brand established, and a product that answers real user needs

Highlights

Building something great? Let's talk

Curious if we can help?