# Fuel - Senior Web3 Software Engineer at deCircle

> Remote · Switzerland · Senior · Software engineering · open. Source: https://alderhq.app/jobs/recruitee%3Adecircletalentpartner%3A2531096 (read 2026-11-08).

## Facts (observed)

- Company: [deCircle](https://alderhq.app/companies/decircle)
- Location text: Zürich, Zürich, Switzerland
- Where it can be done from (inferred): Remote · Switzerland (evidence: "Remote role open worldwide")
- Posted: 2026-03-17 (236 days ago)
- First seen by alder: 2026-11-04 · last verified: 2026-11-07
- Reposted: 0 times · edited: 0 times
- Apply on the employer's site: https://talent.makerdao.network/o/fuel-senior-web3-software-engineer
- Skills listed (inferred): TypeScript, JavaScript, React, Next.js, Vue, Node.js, FastAPI, GraphQL

## Pay and sponsorship

- Posted pay: not posted
- Market band for similar posted roles (Zurich, n 7): p25 $98k, median $140k, p75 $143k

## Description (the employer's text)

Fuel is a high-performance blockchain operating system that redefines what's possible on Ethereum. By combining unparalleled throughput with the core principles of decentralization and security, our platform simplifies the development process for builders worldwide.

We are looking for a Senior Web3 Software Engineer to lead the development of high-performance decentralized applications (dapps) in a blockchain-native environment. You will own major product surfaces end-to-end—from frontend interfaces to on-chain integrations—collaborating closely with product, design, backend, and smart contract teams to ship secure, reliable, and intuitive experiences for traders and users.

### Responsibilities

Design, build, and maintain modern, responsive frontend applications integrated with blockchain protocols for core DeFi products like exchanges.

Integrate with blockchain infrastructure (e.g., EVM chains, Fuel VM), wallet extensions (MetaMask, Phantom, WalletConnect), and on-chain data sources (e.g., subgraphs, indexers).

Implement secure user flows for transactions, multi-sig approvals, cross-chain bridging, and account abstraction.

Collaborate on API design (REST/GraphQL), RPC optimization, and indexer queries for real-time data.

Establish frontend architecture, design systems, and Web3 best practices (testing with Hardhat/Foundry, gas optimization, reentrancy guards, accessibility).

Review code (including Solidity/Sway), mentor engineers, and drive technical decisions on stack interoperability and scalability.

Translate complex DeFi requirements (e.g., MEV protection, oracle feeds) into intuitive UI/UX for trading interfaces.

Proactively identify technical debt in smart contracts or frontend, propose upgrades (e.g., account abstraction), and shape the product roadmap technically

### Requirements

5+ years of professional experience as a software engineer, with 2+ years in a senior/lead capacity building Web3 or blockchain applications.

Deep expertise in modern frontend frameworks (React, Next.js, Vue) with TypeScript/JavaScript, plus Web3 libraries (ethers.js, viem, wagmi).

Strong experience with complex, data-intensive dapps handling real-time streams (e.g., order books, AMM curves).

Proven blockchain integration skills: Browser wallet connections and signing & on-chain interactions via providers (Alchemy, Infura) and libraries for reads/writes/calls.

Solid grasp of web3 security (private key mgmt, blind signing risks, phishing, sandwich attacks).

Backend experience with node services (e.g., Express, FastAPI), off-chain indexers (The Graph), and event listening.

Proficiency in REST/GraphQL, data fetching (SWR, TanStack Query), and state management (Zustand, Redux) in volatile crypto contexts.

Excellent collaboration in fast-paced, autonomous teams using GitHub, Linear, and Discord/Slack.

### Nice to have

Experience at a CEX/DEX (e.g., Uniswap, Fuel's O2, KuCoin integrations).

Building trading UIs (order books, candlestick charts via TradingView/Lightweight Charts, positions, PnL calculators).

Performance tuning for high-throughput DeFi (sub-ms latency, WebSockets for orderflow).

Prior DeFi/fintech work with tokenomics, liquidity mining, or audited protocols.

Design systems (e.g., RainbowKit, Wagmi connectors) and tooling (Vite, esbuild, Foundry for E2E tests).

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Data: alder (https://alderhq.app). Cite https://alderhq.app/jobs/recruitee%3Adecircletalentpartner%3A2531096 and the date you read it. Observed facts come from the employer's own listing; location reach, level, family and skills are inferences.