FintechWeb

Finnly — Multicurrency Crypto Wallet & Exchange

Finnly is a multicurrency crypto wallet and exchange we designed and engineered as a unified consumer surface: 20+ cryptocurrencies and stablecoins, in-app BTC/USDT swap, an NFT browser, a Earn module for staking yield, and a Buy/Sell flow connected to fiat debit cards — all in a dark, motion-led product system.

Client: Finnly
Timeline: 6 months
Team: 6 specialists (mobile, backend, web3, design, QA)
Year: 2026

Build me something similar

Finnly — Multicurrency Crypto Wallet & Exchange

20+Cryptocurrencies supported

< 1sIn-app swap latency

60+ screensSurfaces shipped

Full kitDesign system

What we walked into.

Design a consumer crypto wallet that consolidates BTC, USDT, 20+ altcoins, stablecoins, NFTs, and fiat purchases without overwhelming new users, and pair it with a backend that supports realtime price feeds, address generation per coin, in-app swap quotes, and secure key handling on device.

What we shipped

How we solved it.

Built non-custodial seed-phrase wallets per user, an in-app swap engine with sub-second BTC ↔ USDT quoting, an NFT browser surface, an Earn module for staking yield, and a fiat Buy/Sell flow tied to debit-card processors. The visual system is a dark-mode, isometric, motion-led interface designed for onboarding new crypto users without sacrificing power-user depth. 60+ screens, full design system, plus a backend with realtime feeds and secure key handling.

Our approach, in four moves.

Tight feedback loops, weekly demos, code you fully own.

01→

Discover

Goals, constraints, and scope alignment.

02→

Design

Product and architecture decisions validated early.

03→

Build

Weekly demos, transparent sprints, and code you fully own at the end.

Scale

Observability, quality, and handover.

Gallery

A look at the build.

What we built

Every surface, considered.

React Native

React Native used in delivery.

TypeScript

TypeScript used in delivery.

Node.js

Node.js used in delivery.

GraphQL

GraphQL used in delivery.

PostgreSQL

PostgreSQL used in delivery.

Redis

Redis used in delivery.

Tech stack

What's under the hood.

Technologies

React NativeTypeScriptNode.jsGraphQLPostgreSQLRedisWalletConnectWeb3.jsAWSFigma design system

Outcomes

The numbers we are proud of.

20+Cryptocurrencies supported

BTC, ETH, USDT, USDC, and major altcoins

< 1sIn-app swap latency

Quoting BTC ↔ USDT and major pairs

60+ screensSurfaces shipped

Wallet, NFT, Swap, Earn, Buy/Sell, settings

Full kitDesign system

Dark-mode, isometric, motion-led component library

“Finnly was the first time a vendor delivered both the product design and the engineering for our wallet. The team treated it like a real fintech build, not a UI experiment.”

Product LeadProduct Lead · Finnly

More work