Fintech Website Case Study: How We Built Beam’s Website Before It's Modern Treasury Acquisition

In the fall of 2025, Beam was acquired by Modern Treasury, a payment operations platform used by companies like Gusto, ClassPass, and Marqeta. It's the kind of milestone that turns a project into a growth story, from a single landing page to a product mature enough to be acquired. We were the team behind Beam's website design and development while the company was still an early stage startup, long before the acquisition was even on the horizon.

Who Is Beam?

Beam is an American fintech startup based in San Francisco, founded by Dan Mottice, who previously worked as Visa's crypto product lead. The company built a payment platform based on stablecoins and fiat currencies, allowing clients to make instant payments in both digital and traditional currencies. It supported RTP, FedNow, ACH, bank transfers, and Push to Card.

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Where Beam's Website Started

When we started working with Beam, the company had only one landing page: a simple placeholder site built for an early stage product. It communicated the basics, but it wasn't built to grow, test, or support a marketing team that needed to move fast.

The Challenge: The Product Was Growing Faster Than the Website

Beam was shipping new features and directions quickly, but the website stayed static and couldn't keep up. A few problems stood out. The website didn't reflect reality. There were no regular updates, so the product kept moving while the site stayed frozen.

There was no room for experiments. A single page didn't allow the team to test different messages, audiences, or value propositions. Marketing lacked the right tools. The team needed new landing pages for specific campaigns, customer segments, and hypotheses, and it needed them fast, without depending on a long development cycle.

The brand hadn't caught up yet. The product was growing faster than the visual and communication side of the website, which affected the trust of potential clients. For fintech brands, trust is a key conversion factor.

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How Mainflow Built a Website That Could Scale

1) Scalable website architecture. We rebuilt the website from scratch: modern, responsive, with an architecture that allowed content to scale without rebuilding everything each time. A website is a product that keeps evolving, not a project that gets delivered once.

2) Landing and product pages. Every new campaign or audience segment needed its own page, and development couldn't keep up with marketings pace on the old setup. We built new landing pages and product pages for specific tasks quickly, without depending on a long release cycle.

3) Fast marketing iteration. High speed of iteration is a key requirement for a scaling startup, so the workflow was built around launching new pages in a short time rather than weeks.

4) A/B testing. There was no clear process to check which messages, page structures, or CTAs actually worked. We tested hypotheses through A/B testing on real page and message variations and made changes based on results, not assumptions about what "should" work.

5) Integrated design and development. If design and development were handled by separate teams, every update would go through extra approvals and handoffs. Our team handled both UI/UX design and web development ourselves, in one cycle, which kept the website cohesive and let changes ship faster.

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We also worked directly with Amanda on Beam's side, without intermediate managers. Direct communication with the person making decisions removed layers that usually slow a growing company down.

What We Learned About Building Websites for Scaling Fintech Companies

By observing Beam and similar companies, we noticed a few patterns that repeat across most fast growing fintech startups:

1) In companies that scale quickly, the website is constantly updated, tested, and adapted, just like the product itself.

2) Teams that can quickly launch new pages, messages, and campaigns get an advantage in busy channels such as paid ads, SEO, and partnerships.

3) Trust matters. Since fintech deals with people's and businesses' money, design, clear communication, and social proof (clients, partners, certifications) are major factors in conversion and in building brand trust.

4) Education is an important part of fintech marketing. The most successful fintech companies first explain the complex part of their category in plain language, and only then sell the solution. This works both for classic SEO and for visibility in AI search answers.

5) Modular design systems and fast development cycles allow teams to quickly localize, segment, and test content without depending on large release cycles.

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Beam's story is a good example of how a website needs to evolve alongside a fast-growing product. What started as a single landing page became a flexible marketing platform that could support new pages, experiments, and changing product messaging as Beam grew. If your team is scaling fast and your website can't keep up, that's exactly the kind of problem we like to solve.

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