Senior Web3 Software Engineer

Senior Web3 Software Engineer

Location: Europe/US/Latam

Remote | Full-time

Compensation: $170K - $195K

Our client is a pioneer in the blockchain sector, developing a high-performance operating system designed to redefine scalability and throughput for Ethereum. By combining parallel transaction execution with advanced state minimization, our client’s platform overcomes traditional protocol limitations to provide a groundbreaking environment for decentralized development.

Since its initial launch in 2019, the organization has remained dedicated to enhancing Ethereum's ecosystem through technical innovation, including the creation of a bespoke virtual machine and a specialized programming language. The team is a globally dispersed group of innovators committed to shaping the future of blockchain technology through secure, decentralized, and high-throughput solutions.

Our client is seeking a Senior Web3 Software Engineer to lead the development of high-performance decentralized applications (dapps). This individual will own major product surfaces end-to-end—from frontend interfaces to on-chain integrations—collaborating across product, design, and smart contract teams to deliver secure and intuitive experiences for traders and users.

Key Responsibilities

• Dapp Development: Design, build, and maintain modern, responsive frontend applications integrated with blockchain protocols for core DeFi products and exchanges.
• Protocol Integration: Implement integrations with blockchain infrastructure (e.g., EVM chains, custom VMs), wallet extensions (MetaMask, Phantom, WalletConnect), and on-chain data sources such as subgraphs and indexers.
• Security & User Flow: Execute secure user flows for transactions, multi-sig approvals, cross-chain bridging, and account abstraction.
• Infrastructure Collaboration: Contribute to API design (REST/GraphQL), RPC optimization, and indexer queries to ensure high-performance, real-time data delivery.
• Technical Leadership: Establish frontend architecture, design systems, and Web3 best practices, including gas optimization, reentrancy guards, and accessibility.
• Mentorship & Code Quality: Perform rigorous code reviews (including Solidity/Sway), mentor engineering staff, and drive strategic decisions regarding stack interoperability and scalability.
• UX Optimization: Translate complex DeFi requirements, such as MEV protection and oracle feeds, into intuitive UI/UX for professional trading interfaces.
• Roadmap Strategy: Proactively identify technical debt, propose infrastructure upgrades, and technically shape the product roadmap.

Interview Process

1. Hiring Manager Interview: Initial alignment on experience and role expectations.
2. Technical Interview I: Assessment of core engineering skills and Web3 proficiency.
3. Technical Interview II: Deep dive into architecture, security, and specialized DeFi knowledge.
4. Final Interview: Comprehensive evaluation of leadership qualities and cultural fit.

Requirements

• Professional Experience: 5+ years of software engineering experience, with at least 2 years in a senior or lead capacity specifically building Web3 or blockchain applications.
• Frontend Expertise: Deep proficiency in modern frameworks (React, Next.js, or Vue) using TypeScript/JavaScript, alongside Web3 libraries (ethers.js, viem, wagmi).
• Dapp Specialization: Strong experience developing complex, data-intensive dapps that handle real-time streams, such as order books or AMM curves.
• On-Chain Interaction: Proven ability to manage browser wallet connections and execute on-chain interactions via providers (Alchemy, Infura) and libraries for reads, writes, and calls.
• Security Literacy: A solid grasp of Web3 security principles, including private key management, blind signing risks, and mitigation of sandwich attacks or phishing.
• Full-Stack Awareness: Experience with Node services (Express, FastAPI), off-chain indexers (The Graph), and event listening mechanisms.
• Data Management: Proficiency in REST/GraphQL, data fetching (SWR, TanStack Query), and state management (Zustand, Redux) within volatile market contexts.

Preferred Qualifications

• Previous experience at a Centralized (CEX) or Decentralized Exchange (DEX).
• Experience building trading UIs featuring order books, candlestick charts, and PnL calculators.
• Performance tuning for high-throughput DeFi applications (sub-ms latency, WebSockets).
• Prior work in fintech or DeFi involving tokenomics or audited protocols.

Benefits

• High-Impact Ownership: The opportunity to lead the development of critical dapps at the intersection of Web2 and Web3.
• Full-System Autonomy: Freedom to architect complete systems, spanning from UI to smart contracts and off-chain bots.
• Expert Collaboration: Work alongside a globally dispersed team of deep blockchain experts focused on network and DeFi innovation.
• Innovative Environment: Access to cutting-edge tools and a mission-driven culture dedicated to shaping the future of decentralized finance.

Due to the high volume of applications we anticipate, we regret that we are unable to provide individual feedback to all candidates. If you do not hear back from us within 4 weeks of your application, please assume that you have not been successful on this occasion. We genuinely appreciate your interest and wish you the best in your job search.

Commitment to Equality and Accessibility:

At MLabs, we are committed to offer equal opportunities to all candidates. We ensure no discrimination, accessible job adverts, and providing information in accessible formats. Our goal is to foster a diverse, inclusive workplace with equal opportunities for all. If you need any reasonable adjustments during any part of the hiring process or you would like to see the job-advert in an accessible format please let us know at the earliest opportunity by emailing human-resources@mlabs.city.

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