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All Capabilities/Engineering/ENGINEERING / WEB & DAPPS
02.3 / ENGINEERING / WEB & DAPPS

Operator interfaces,
indexers & SDKs.

We build ultra-responsive Web3 web applications, real-time orderbook terminals, browser ZK provers, and zero-dependency TypeScript SDKs.

Scope this engagement
< 380msWEBSOCKET TELEMETRY SYNC

Real-time orderbook & block stream synchronization on Somnia and Solana.

~2.0sIN-BROWSER ZK PROVING

Non-blocking WebWorker Groth16 proof generation on standard laptops.

ZeroSTALE RPC UI FLICKER

Optimistic state transitions paired with deterministic event receipt verification.

01 / FOUNDER PERSPECTIVE

Your frontend is where users actually experience your protocol’s speed.

WHY MOST TEAMS STALL HERE

Even on a sub-second chain like Solana or Somnia, a poorly engineered frontend with polling bottlenecks, unbatched RPC calls, or main-thread blocking cryptography feels sluggish and unreliable.

HOW WE ENGINEER IT AT WEB3SPELL LABS

We engineer Web3 frontends like financial trading terminals. We stream state over WebSockets, run heavy cryptographic witness generation inside background WebWorkers, cache and batch RPC reads deterministically, and ship typed SDKs so both your own dApp and third-party integrators get instant reactivity.

02 / TECHNICAL ARCHITECTURE & SCOPE

What we actually
design and ship.

No vague retainers or slide-deck theater. Every engagement in this practice is decomposed into concrete engineering and design workstreams.

01OPERATOR UI

High-Frequency Trading & DeFi Web Terminals

We build frameless, keyboard-accessible financial interfaces that handle live orderbook ticks, multi-leg execution previews, and portfolio telemetry without frame drops.

SPECIFICATIONS & ARTIFACTS
  • Next.js App Router + React 19 + Viem v2 / Wagmi / Solana Wallet Adapter
  • Live spread z-score engines, 4-quadrant payoff matrices & slippage guards
  • Optimistic transaction steppers with instant block-explorer receipt binding
02CLIENT CRYPTO

In-Browser Cryptography & Relayer Middleware

We wire complex client-side cryptography (Poseidon hashing, Merkle path assembly, snarkjs proving, and EIP-712 signing) into smooth, single-click user flows.

SPECIFICATIONS & ARTIFACTS
  • Dedicated WebWorker proving threads so the UI never freezes
  • Gasless relayer & ERC-4337 bundler middleware for zero-SOL / zero-ETH claims
  • Deterministic key derivation and encrypted local session storage
03SDK ENGINEERING

TypeScript SDKs & Developer Integration Kits

Want other dApps, bots, or institutions to integrate your protocol? We wrap your contract ABIs/IDLs into a clean, documented, tree-shakeable TypeScript SDK.

SPECIFICATIONS & ARTIFACTS
  • Strictly typed contract wrappers, quote calculators & transaction builders
  • Built-in pre-flight simulation and human-readable error decoding
  • Published NPM packages with copy-paste runnable examples
04INDEXING & DATA

Event Indexers & Sub-Second State Streams

Querying raw blockchain nodes from the browser doesn’t scale. We build lightweight indexers and WebSocket state streams that serve historical and live protocol data instantly.

SPECIFICATIONS & ARTIFACTS
  • Custom event indexers for EVM logs and Solana program accounts
  • Sub-second WebSocket push pipelines for live orderbooks and cycle updates
  • Automated RPC failover and multi-provider load balancing
03 / EXECUTION CADENCE

How an engagement
runs week by week.

Direct Slack/Telegram channel with our founders and engineers, weekly shippable milestones, and clean handoff to your internal team.

01Week 1

State & RPC Architecture

We map every contract read, event subscription, and wallet write into a clean client-side state machine and SDK interface.

OUTPUTTyped SDK & State Architecture
02Week 2–4

Core Terminal & Wallet Wiring

We build the production Next.js views and wire live wallet signing, pre-flight simulations, and error handling.

OUTPUTConnected Testnet Application
03Week 4–5

Real-Time Streams & Performance Tuning

We integrate WebSocket telemetry, WebWorker provers, and sub-second UI updates, profiling every render cycle.

OUTPUTBenchmarked Production UI
04Week 6

CI/CD, Monitoring & Launch

We configure deterministic builds, RPC fallbacks, analytics, and ship to production with full documentation.

OUTPUTLive Mainnet dApp & SDK
WHO THIS IS BUILT FOR
  • Protocols with finished or in-progress smart contracts that need a flagship production frontend
  • Teams building high-frequency CLOBs, prediction markets, or ZK apps where UI performance is critical
  • Infrastructure protocols that need a clean TypeScript SDK so partner teams can integrate in hours
TANGIBLE DELIVERABLES
  • Production Next.js / React 19 web application repository
  • Typed TypeScript client SDK for contract reads, quotes, and transaction building
  • Real-time WebSocket / indexer data layer & multi-RPC failover config
  • End-to-end Playwright / wallet-simulation test flows
  • Deployment pipeline (Vercel / AWS) with environment & security headers configured
PRODUCTION STACK & TOOLING
Next.js 15/16 & React 19TypeScript 5Viem v2 & WagmiSolana Web3.js & Anchor TSWebWorkers + SnarkJSWebSockets / SubgraphsTailwind CSS & Framer Motion
SHIPPED PROOF · SOMNIA × DREAMDEX ECOSYSTEM

Divergence Router

See how we engineered the Divergence Router terminal on Somnia Shannon, combining a live WebSocket spread detector, a PostOnly-to-IOC routing engine, and 1-click atomic execution.

Read Somnia × DreamDEX Ecosystem case study Inspect live deployment
04 / RELATED IN ENGINEERING / 03View all 09 capabilities
Parent discipline

Engineering Overview

Full overview of our Product & Protocol Engineering discipline.

Groth16, MPC & AA

ZK & Protocol

Zero-knowledge circuits, Nillion MPC/TEE privacy stacks, and protocol primitives.

Solana Rust & EVM

Smart Contracts

Audited Anchor/Rust and Solidity/Foundry contract systems.

READY WHEN YOU ARE

Bring us your
hardest problem.

Whether you need a focused 4-week intervention in operator interfaces, or a complete 0-to-Hero protocol build, you work directly with our founders and senior engineers.

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