Mangrove ships a full AI-powered crypto trading platform with Rosvelt

The Nashville fintech startup turned to Rosvelt to build what would normally require a 10-person engineering team — a web-based crypto trading platform with a drag-and-drop strategy builder, in-browser Python IDE, AI copilot, backtesting engine, and community marketplace — all without hiring a single developer.

Products used: Tickets · Agents · Deploy

Tags: Fintech · MVP · Crypto · Figma

3 days — backlog to live

30 hours of agent build time

1 — developer hired

Complex features:

Challenge

Timothy Darrah is not your typical startup founder. A U.S. Army veteran, former NASA Fellow, Vanderbilt PhD and adjunct professor, and ex-Deloitte strategy manager, he spent nearly two decades navigating complex systems — from avionics maintenance on military aircraft to digital twin modeling for Navy patrol boats to AI-driven prognostics at NASA Ames. In early 2026, he left Deloitte to co-found Mangrove Technologies alongside David Buttrey and Caroline Randall Williams.

The thesis was clear: the digital asset market had matured enough for institutional capital, but the infrastructure hadn't kept up. Registered investment advisors and wealth managers had no standardized way to see client crypto holdings, no systematic workflow for onboarding digital assets, and no consistent framework to assess their risk. As a result, firms couldn't advise confidently — or charge fees on a growing portion of client wealth.

Mangrove set out to solve this with an AI-enabled wealthtech ecosystem: secure account aggregation, a risk-scored asset universe, and — critically — a platform where users could build, test, and deploy automated trading strategies without needing a quant team.

The product vision was ambitious. Timothy arrived with a fully scoped backlog:

Mangrove had just closed a pre-seed round, had a 15-person team focused on business development and go-to-market, and was already generating momentum — speaking at Bitcoin for Corporations, sponsoring Blockchain Futurist Conference, and landing press in the Nashville Business Journal. What they didn't have was an engineering org that could ship this scope on a startup timeline.

Solution

Timothy didn't arrive with a napkin sketch. He came with a complete Figma design system — every screen, every state, every interaction already specced pixel by pixel. The design was polished, the user flows were mapped, and the component hierarchy was clear. What he needed was someone who could translate that vision into production code without cutting corners.

Rosvelt's agents picked up the Figma files and started building. Three days of code development. That's it.

The agents didn't just move fast — they moved right. The codebase that shipped was built for scale from day one: clean component architecture with reusable primitives, a concrete Storybook library documenting every UI element in isolation, and a folder structure that a future engineering team could walk into and immediately understand. No spaghetti code. No "we'll refactor later." No tech debt traded for speed.

Every component in the drag-and-drop strategy canvas, the backtesting charts, the wallet dashboard, the community marketplace — each one lives in Storybook with documented props, states, and edge cases. A retail trader clicking through the visual builder and a quant writing Python in the IDE are using the same design tokens, the same responsive grid, the same interaction patterns.

The ten-feature scope that would have required months of hiring and coordination collapsed into parallel workstreams. While one agent built the authentication layer, another was scaffolding the wallet integration. While the drag-and-drop canvas took shape, the backtesting engine was already ingesting historical market data in the background. The Python IDE — typically a standalone project in itself — shipped as a natural extension of the strategy builder, sharing the same deployment pipeline.

Results

A seed-stage startup shipped a platform that competes with teams ten times its size.

Mangrove went from backlog to a working product — authentication, wallets, visual strategy builder, Python IDE, backtesting, live monitoring, AI copilot, community marketplace, and admin controls — just with Matthew and Rosvelt.

For Mangrove, the math was simple: the cost of Rosvelt's agents was a fraction of what a comparable engineering team would have cost for even a single quarter. The time saved let Timothy focus on what mattered — fundraising, regulatory positioning, and building the partnerships that would bring institutional capital onto the platform.

"Went above and beyond, my new go-to for front end design and development! Excellent communication and completed milestones ahead of schedule. He did the design for our webapp and then built it!! Very quickly I might add! Thoughtful, creative, and self governing who really knows his stuff with design and implementation. Very intuitive"