Senior Web3 Software Engineer

Fuel Labs • Full-time • Portugal • 1d ago

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.

The Fuel Virtual Machine, with its groundbreaking state minimization and parallel transaction execution capabilities, sets a new standard for Ethereum Rollups, overcoming existing limitations in protocol development.

Since our 2019 launch with Fuel V1, we've been focused on enhancing Ethereum's scalability. Our innovations, like the Fuel Virtual Machine and the Sway programming language, provide developers with a powerful, user-friendly environment.

We’re a passionate, intelligent, and empathetic globally dispersed team, united by a love for innovation and a commitment to shaping the future of blockchain technology—one groundbreaking solution at a time.

Role Overview

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).

What we offer

High-impact ownership building dapps at the web2/web3 boundary, like on-chain exchanges and market-making tools.
Autonomy to architect full systems, from UI to smart contracts and off-chain bots.
Collaborative team with deep blockchain expertise, focused on Fuel Network and DeFi innovation.

Be Aware of Job Scams

Fake job ads and fraudulent recruiters can sometimes appear in the Web3 industry. To ensure the legitimacy of any job offer or recruiter communication, please contact us directly at jobs@fuel.sh.

Our Commitment

At Fuel Labs, we are an equal opportunity employer. We are committed to fostering a fair and inclusive work environment. We do not discriminate against applicants or employees based on race, color, religion, national origin, gender, age, disability, veteran status, or any other protected status.

All qualified applicants are encouraged to apply.

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