Senior Web3 Software Engineer

Job not on LinkedIn

🕒 May 18

🇨🇭 Switzerland – Remote

⏰ Full Time

🟠 Senior

🧑‍💻 Full-stack Engineer

👻 Ghost score 23%

What it means: how likely this posting is sitting open without active hiring.How to read it: 60% or higher means we think this is a ghost. Lower scores are less of a worry.How we score it: age, reposts, open roles vs team size, how fast jobs close, and whether pay is listed.Fine print: an estimate from public data, not a judgment of the company. Real jobs can score high, so treat it as a hint, not a fact.

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decircle

WebsiteLinkedInAll Job Openings

1 - 10 employees

Founded 2019

📣 Marketing

📦 Logistics

💼 Consulting

Marketing • Logistics • Consulting

Decircle is a talent partner specializing in staffing and recruiting for decentralized organizations and projects related to Web3. As a boutique recruitment agency, Decircle focuses on identifying and attracting talent in the blockchain and Web3 sectors, fostering connections within the community of decentralization enthusiasts and guiding them in finding their roles in the evolving decentralized landscape.

📋 Description

• 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).