How We Built a Scalable Subscription Platform with Financial Integrations for a Climate-Focused Business

A custom-built platform designed to handle subscriptions, user management, and financial integrations — enabling the business to launch, operate, and scale effectively.

Overview

Client:

Carma.earth

Headquarters:

England, United Kingdom

Industry:

Climate / Fintech

Project Type:

Platform / SaaS Development

What We Delivered:

Custom subscription-based platform with integrated financial systems

Link to live project:

carma.earth →

THE PROBLEM

Carma was building a product that required more than a simple website or landing page.

They needed a platform that could:

handle recurring subscriptions
manage user accounts and data
integrate with financial systems
provide a reliable and scalable backend

Trying to piece this together using multiple tools or off-the-shelf platforms would have introduced limitations, complexity, and potential issues as the business grew.

There was also a risk of:

building something too rigid
overcomplicating the initial product
or creating technical debt early on

The challenge was to strike the right balance between:
👉 building a strong, scalable foundation
👉 while keeping the product lean and practical for launch

THE SOLUTION

We worked closely with the client to design and develop a custom platform tailored to their product model.

Rather than forcing the business into generic tools, we built a system that aligned with:

how the product works
how users interact with it
how subscriptions and payments are handled
how the business would scale over time

We focused on building a clean, structured platform architecture that could support both current needs and future expansion.

WHAT WE BUILT

The platform included:

A subscription management system for recurring payments
Secure user account system and authentication
Financial system integrations to support transactions
Backend infrastructure designed for scalability
Custom platform architecture tailored to the product

We ensured that:

the system was reliable
the user experience was smooth
and the platform could evolve as the business grows

THE OUTCOME

As a result of the platform:

The business successfully launched a functional product
Users were able to subscribe and interact with the platform seamlessly
Financial processes were handled reliably within the system
The platform was built on a foundation that supports scaling

Most importantly, the business now has full control over its product, rather than being limited by third-party tools.

WHY THIS MATTERS

For SaaS and platform-based businesses, the foundation is critical.

Many startups either:

overbuild too early
or rely on tools that limit them later

A properly built platform allows a business to:

launch with clarity
scale without rebuilding
maintain control over its product and data

This project demonstrates how the right approach to building an MVP or platform can set a business up for long-term success.

CLIENT REVIEW:

★★★★★
"I found their developers technical ability and speed of work the most impressive."

Iain Gurney

Co-Founder | Carma

Let’s talk about what your business needs to build, automate or improve.

Book a discovery call and tell us what you are trying to solve. We will help you think through the best next step, whether that is a custom internal system, automation, a dashboard, a dedicated developer or a full MVP build.