Senior Fullstack Developer (Web3)

Senior Full Stack Engineer (Web3)

Location: Israel, Tel Aviv (Hybrid)
Employment: Full-time

About the company

We’re working with an early-stage Web3 company building tools that help users better understand blockchain transactions and interact with digital assets more safely. Its products are used across desktop and mobile, and the engineering team works on challenges involving wallets, dApps and blockchain security.

The role

We’re looking for a senior full stack engineer with strong JavaScript and TypeScript skills and a frontend focus. You’ll build features end to end, from the user interface and browser experience to the Node.js services behind the product, and take ownership of your work after release.

What you’ll work on

• Build client-side features using TypeScript and React, including browser-based products.

• Develop wallet and dApp integrations across EVM-compatible chains and Solana.

• Build and maintain Node.js services and APIs.

• Improve performance, reliability and code quality across the stack.

• Contribute to the build, test and release pipeline.

What we’re looking for

• 5+ years building production software with JavaScript and TypeScript, with a frontend focus.

• Strong understanding of JavaScript fundamentals, including the event loop, promises and async behaviour, closures, scope, prototypes, modules and bundling.

• Good knowledge of browser behaviour, HTTP and networking.

• Strong React skills and an eye for detail. You’ve worked with design systems and Figma, and care about component architecture, accessibility and polished interfaces.

• Experience with Node.js services, APIs, databases and queues.

• Familiarity with blockchain transactions, gas, nonces, approvals, permits and signing methods such as personal_sign and EIP-712.

• Hands-on experience with Web3 tools such as ethers or viem, wagmi, injected providers and WalletConnect.

• Comfortable with CI/CD and automated testing, using GitHub Actions or similar tools.

• A resourceful problem solver who can investigate issues using source code, specifications, debuggers, logs and monitoring.

• Clear written and spoken English, good communication habits, and the ability to take ownership in a low-process environment.

• Familiarity with current AI tools used in software development.

Helpful experience

• Application security, smart contract auditing, bug bounties, CTFs or research into phishing and Web3 threats.

• Browser extension development, including Manifest V3, content scripts, service workers and extension messaging.

• Knowledge of wallet internals, EIP-1193 providers, and how to inspect transaction or signature requests.

• Experience with transaction simulation, RPC nodes, on-chain data or Solana.

• Experience building a Web3 product used by real customers, such as a wallet, dApp or developer tool.

• Experience with NestJS, PostgreSQL, Redis, BullMQ or Cloudflare Workers.

• Open-source contributions in the JavaScript or Web3 ecosystem, or experience in an early-stage startup.

What’s on offer

• Competitive salary and employment conditions.

• Ownership of the features and systems you build.

• The opportunity to work with an experienced engineering team.

• A fast-moving environment with a short path from idea to release.

To apply: Send your CV and, if you can, a brief note about something you’ve built and are proud of.