Senior Front-End Engineer

Senior Frontend Engineer

Inco is building the confidentiality layer for blockchains through encryption technologies. We're building the next generation of secure, scalable, and privacy-enhancing solutions for Web3, enabling fintech, payments, and blockchain applications to have the same confidentiality and capabilities users expect from Web2.

We're looking for a senior frontend engineer who has built production-grade Web3 user experiences and understands the unique complexity of blockchain applications.

This role is remote / hybrid / based in Bangalore (preferred).

Responsibilities

• Design, build, and maintain production-grade frontend applications using modern frontend technologies.
• Own frontend features end-to-end, from product requirements and UX flows to implementation, testing, and deployment.
• Build responsive, performant, and reliable user interfaces for Web3 products.
• Create reusable frontend components, patterns, and architecture that allow the team to move quickly without sacrificing quality.
• Work closely with product, design, backend, and protocol teams to translate complex Web3 flows into intuitive user experiences.

• Build frontend experiences that integrate with wallets, smart contracts, indexers, RPC providers, and blockchain data sources.
• Implement flows involving transaction signing, message signing, intent signing, session keys, delegated permissions, and account abstraction.
• Design user experiences around balances, transaction history, onchain transactions, permissions, and Web3 payment flows.
• Understand how to fetch, cache, reconcile, and display onchain and offchain data safely and accurately.
• Handle edge cases common in Web3 applications, including pending transactions, reorgs, failed RPC calls, wallet disconnects, chain switching, stale balances, and inconsistent indexer data.

• Ensure frontend flows are secure by default, especially when users are asked to sign messages, authorize intents, or store session keys locally.
• Apply best practices for client-side key management, session key storage, permission scoping, signature domain separation, and phishing-resistant UX.
• Work with the team to identify and prevent risks around malicious signatures, replay attacks, unsafe approvals, incorrect transaction previews, and confusing wallet prompts.
• Treat frontend correctness as critical infrastructure, especially when user funds or private information are involved.

• Lead technical design discussions and help define frontend architecture, standards, and best practices.
• Review code and mentor junior engineers on frontend quality, Web3 security, testing, and production readiness.
• Improve engineering velocity by building strong abstractions, documentation, and internal tooling.
• Take ownership of frontend quality across performance, reliability, security, accessibility, and maintainability.

Required Experience

• 5+ years of frontend engineering experience, with strong production experience building complex applications.
• Strong expertise in TypeScript, React, and modern frontend development.
• Experience building Web3, crypto, wallet, DeFi, payments, or blockchain-related frontend products.
• Strong understanding of wallet integrations, transaction flows, message signing, and onchain data fetching.
• Experience working with libraries and tools such as viem, wagmi, ethers.js, WalletConnect, RainbowKit, or similar.
• Strong understanding of frontend state management, API integration, caching, and real-time data updates.
• Ability to reason carefully about security-sensitive frontend flows involving user funds, permissions, signatures, or keys.
• Experience owning large frontend features from design to production.
• Strong communication skills and ability to work closely with product, design, backend, and protocol engineers.
• Experience mentoring junior engineers and raising frontend engineering standards.
• Startup mindset: comfortable with ambiguity, fast iteration, and taking ownership end-to-end.

Preferred Qualifications

• Experience building wallets, smart account interfaces, account abstraction flows, or session key systems.
• Experience with intent-based protocols, delegated permissions, EIP-712 signatures, EIP-1271, EIP-4337, or EIP-7702.
• Experience building frontend interfaces for privacy-preserving, security-sensitive, or financial applications.
• Experience with indexers, subgraphs, custom backend APIs, RPC providers, and blockchain event reconciliation.
• Strong product sense and ability to simplify complex Web3 flows for mainstream users.
• Experience with frontend testing, including unit tests, integration tests, end-to-end tests, and wallet interaction testing.
• Experience with Next.js, Tailwind, design systems, component libraries, and frontend performance optimization.
• Open-source contributions or prior work in crypto, wallets, DeFi, payments, or developer tools.

What Success Looks Like

• You will help build the frontend experience for Inco's core products, making advanced privacy and Web3 payment flows feel simple, secure, and intuitive.
• You will be responsible for creating interfaces that users can trust when signing intents, managing permissions, interacting with wallets, and moving funds privately.
• You will help establish the frontend foundation for Inco's products while mentoring the team and setting a high bar for quality, security, and user experience.