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dApp Development: Frontend & Web3 UX Engineering

In short

A dApp is a frontend plus everything it talks to: wallet connection, transaction UX, and live on-chain data. We build all of it, and the contracts and subgraphs underneath, so the UI and the chain stay in sync. Proof is public: omen-exchange, Venus and Maker interfaces, and the KyberDAO portal.

$2B+
assets secured
Top-3
indexer in The Graph
250+
projects since 2016
1M+
developers (Solhint)
Trusted by teams building on-chain

Most Web3 products are judged on the frontend. A user does not see your contracts; they see a wallet-connect button, a transaction they are asked to approve, and a screen that either makes sense or does not. dApp development is Web3 frontend engineering with a harder job than ordinary web work: a decentralized application (dApp) has to connect to a wallet, construct and preview on-chain transactions, read live data from the chain, and stay correct while the network settles. Get the UX wrong and users leave before they reach the product.

Protofire is a full-stack blockchain team, not a backend-only shop. We have built and open-sourced production dApp frontends, omen-exchange (a full prediction-market exchange UI), an interface for Venus and one for Maker, and reusable Web3 components like big-number-input.

We built the KyberDAO delegation portal used by 7,000+ stakers, and the Telos zkWallet app. Because we also build the contracts, subgraphs, and infrastructure underneath, the frontend and the chain state stay in sync, which is exactly where dApps usually break.

We build the frontend for a product you are launching, or the frontend for contracts you already have, along with the wallet UX, the real-time data layer, and the design system around it. As a top-3 indexer in The Graph, the data that makes a dApp feel instant is something we build, not something we wait on.

A dApp is a frontend plus everything it talks to

The screen is the visible part. We build the layers behind it that make it work, and keep them in sync.

01

Frontend / UI

The React or Next.js app: wallet connection, transaction construction and preview, and the flows a user actually touches.
02

Wallet & signing

Connection to any wallet (injected, WalletConnect, embedded), transaction signing, and gasless UX via account abstraction.
03

Contract layer

The smart contracts the app reads and writes, and the read and write patterns that keep the UI in sync with on-chain state.
04

Data & indexing

Subgraphs and indexers that turn raw chain data into fast, queryable state, so the UI loads in milliseconds instead of scanning the chain.
05

Infrastructure

RPC access, oracle and price data, and the monitoring that keeps the app responsive under real load.
01

What we build

Web3 frontends & dApp UI

Full React and Next.js dApps: DeFi dashboards, exchanges, governance portals, staking and vault UIs, and prediction markets. We have shipped these as open source (omen-exchange, and interfaces for Venus and Maker), so the patterns are ours, built and run, not borrowed from a template.

Wallet connection & transaction UX

The part users judge you on. Clean wallet connection across injected wallets, WalletConnect, and embedded wallets; readable transaction previews so a user knows what they are approving; sane pending, success, and error states; and gasless onboarding via account abstraction so a first action does not require ETH.

Real-time on-chain data

A dApp is only as fast as its data. As a top-3 indexer in The Graph, we build the subgraphs and indexers behind the UI so balances, positions, and history load in milliseconds, instead of the browser scanning the chain block by block. When the data layer is right, the product feels instant.

Design systems & components

The UI kit a Web3 product needs: token and amount inputs that handle 18-decimal values without rounding surprises, transaction and status components, and a design system that stays consistent as the app grows. Our open-source big-number-input and sla-widget components came out of this work.

Frontend on top of your contracts

Most dApp work is not greenfield. You have contracts and need a product around them. We build the frontend, the read and write layer, and the indexing against your existing contracts, and we fix the integration bugs that surface exactly where the UI meets chain state.

Full-stack, not just the screen

A dApp breaks at the seams between frontend, contracts, and data. Because we build and own all three, a bug in a transaction flow is ours to trace from the button to the contract, rather than a hand-off between a design shop and a contract vendor who each blame the other.

02

How an engagement works

Design & prototype

We map the core flows (connect, transact, read state), design the UX around the transactions a user actually makes, and prototype the screens that carry the most risk. Deliverable: a clickable prototype and a component plan.

Build the frontend & data layer

The React or Next.js app, the wallet and transaction UX, and the subgraph or indexing layer that feeds it, built against your contracts and tested on testnet with real wallet flows.

Integrate, test & ship

Integration on your target chains, wallet-compatibility and edge-case testing, and launch, with monitoring wired in so you see failures before users report them.
03

What teams come to us for

A production frontend for contracts they already have
A DeFi dashboard, exchange, or governance portal
Wallet connection and transaction UX that does not lose users
Real-time on-chain data via subgraphs
A design system and component library for a Web3 product
Gasless, mobile-friendly onboarding
04

We build the Web3 frontend and the stack under it

Protofire has shipped 250+ blockchain projects across 60+ networks since 2016, and frontends are part of that record, not a new line. We built and open-sourced omen-exchange, a full prediction-market exchange interface, along with dApp interfaces for Venus and Maker and reusable components like big-number-input and sla-widget.

We built the KyberDAO delegation portal used by 7,000+ stakers, and shipped the Telos zkWallet app as a cross-platform product with its own backend. What sets this apart from a design studio is what sits underneath: as a top-3 indexer in The Graph we build the data and indexing layer that makes a dApp feel instant, we build the smart contracts the app reads and writes, and we wire in account abstraction for gasless UX.

We maintain Solhint, the linter used by 1M+ developers, so the contracts your frontend talks to hold to the standard we set. One team owns the button, the transaction, and the contract behind it.

“Users never see your contracts. They see a connect button, a transaction to approve, and a screen that either makes sense or does not.”

Open source we’ve shipped

The Protofire repositories behind this page

omen-exchange

★ 75→

The Omen prediction-market exchange interface

venus-protocol-interface

→

The Venus Protocol lending dApp frontend

big-number-input

→

A React input component for big-number (18-decimal) values

Part of 190+ open-source repositories from Protofire

FAQ

What is dApp development?
dApp development is building the application layer of a Web3 product: the frontend a user interacts with, plus the connection to smart contracts and on-chain data that a normal web app does not need. A decentralized application (dApp) is a web app with extra jobs: it connects to a user's wallet, constructs and previews transactions the user signs, reads live state from the blockchain, and has to stay correct while the network settles a transaction that can take seconds and can fail. In practice most of the effort is in the seams: making the wallet connection reliable, the transaction preview honest, the pending and error states clear, and the on-chain data fast enough that the UI feels instant. Protofire builds the frontend and the contract, indexing, and infrastructure layers underneath it, so those seams are engineered rather than patched.
Can you build a frontend for our existing smart contracts?
Yes, and it is one of the most common reasons teams come to us. You have working contracts and need a real product around them: a dashboard, an exchange, a governance or staking portal, an app users can actually use. We build the frontend, the read and write layer against your contracts, and the indexing that feeds the UI, and we handle the integration issues that show up where the interface meets chain state (stale reads, failed transactions, reorgs, and wallet quirks). Because we also do contract engineering, we can fix or extend the contracts where the frontend exposes a gap, rather than working around it in the UI. You get a product on top of the contracts you already trust.
What is Web3 UX, and how is it different from normal web design?
Web3 UX is the design of flows that involve a wallet and on-chain transactions, which behave nothing like a normal web form. A user has to connect a wallet, understand and approve a transaction, and wait for it to settle, and any step can fail in ways a Web2 app never sees: rejected signatures, insufficient gas, failed transactions, and network switches. Good Web3 UX makes those moments legible: a clear connect flow, a transaction preview that says what will actually happen, honest pending and error states, and, where it helps, gasless onboarding through account abstraction so a first action does not require the user to hold ETH. It is as much engineering as design, because the interface has to reflect real chain state accurately. We design and build both sides together.
Do you build the data and indexing layer behind the frontend?
Yes, and it is often what separates a dApp that feels instant from one that feels slow. Reading directly from the chain in the browser is slow and fragile, so a serious dApp reads from an indexed data layer instead. As a top-3 indexer in The Graph, we build the subgraphs and custom indexers that turn raw on-chain events into fast, queryable data, and we operate them as your app and its volume grow. That means balances, positions, order books, and history load in milliseconds. Building the frontend and the indexing together is a real advantage: the data is shaped for the exact queries the UI makes, instead of the frontend working around a data layer someone else designed.
What frameworks and libraries do you use?
We build with the modern Web3 frontend stack: React and Next.js for the app, TypeScript throughout, and the standard on-chain libraries (ethers and viem or wagmi) for contract interaction. For wallet connection we use the established options (WalletConnect, injected-wallet connectors, and embedded-wallet SDKs) rather than a bespoke connector that breaks with every wallet update. For data we use The Graph and custom indexers we build and run. We match your existing stack where you have one, and we draw on our own open-source work (for example big-number-input, our component for safe 18-decimal amounts) rather than rebuilding solved problems. The goal is a maintainable codebase your team can own, not a black box.
Do you only do frontend, or the whole stack?
Both, and the whole stack is the point. We can build just the frontend for contracts you already run, or the full application: contracts, indexing, infrastructure, and the UI on top. The reason to bring one team is that dApps break at the boundaries between those layers, and a single team that owns all of them can trace a bug from the button a user clicked to the contract that reverted, rather than passing it between a design shop and a contract vendor. Protofire builds smart contracts, subgraphs and indexing, node infrastructure, and frontends, so we can take the layer you are missing or the entire product, and keep it coherent.

Reviewed by Luis Medeiros, Field CTO at Protofire. Last reviewed: July 2026.

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