Senior Frontend Engineer
About Inco
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.
Who You Are
We’re looking for a senior frontend engineer who has built production-grade Web3 user experiences and understands the unique complexity of blockchain applications.
You have strong frontend fundamentals, but you also understand that Web3 frontend engineering is not just about building interfaces. It requires safely fetching and interpreting onchain data, integrating wallets, handling signatures, managing client-side state, and designing user flows where security and correctness matter.
You should be comfortable building polished, reliable UIs while also thinking deeply about how users interact with wallets, sign messages, grant permissions, manage session keys, and execute intent-based flows. You understand the security risks of asking users to sign transactions or messages, and you care about making those flows clear, safe, and difficult to misuse.
We’re looking for someone senior who can own frontend architecture end-to-end, raise engineering standards, and mentor more junior engineers. You should be the type of person who can turn ambiguous product requirements into secure, elegant, production-ready user experiences.
This role is remote / hybrid / based in Bangalore (preferred).
Responsibilities
Frontend Architecture & Development
- 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.
Web3 Product & Wallet Integration
- 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.
Security & Correctness
- 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.
Leadership & Mentorship
- 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.
