Senior Software Development Engineer - Blockchain & DeFi
First seen by Alion on Sep 16, 2026.
Senior Software Engineer (Blockchain & DeFi)
Location : Gurugram (Hybrid)
Experience : 5+ Years
About the client : A fintech Unicorn
Role Purpose :
The Senior Software Engineer will be a hands-on engineer within the digital asset engineering team, building and shipping the services that power our blockchain and DeFi products - smart contracts, wallet and transaction services, on-chain/off-chain integrations, and the backend platforms that connect Web3 capabilities to a regulated banking core. You will own features end-to-end, contribute to design decisions, and hold a high bar for code quality, testing, and reliability.
Key Responsibilities :
- Develop and maintain production-grade smart contracts and protocol integrations (EVM/Solidity), including testing, deployment, and upgrade workflows.
- Build backend services and APIs (microservices, event-driven architecture) connecting on-chain activity with the bank's core platforms, ledgers, and compliance systems.
- Implement wallet and transaction-orchestration features - signing flows, nonce and gas management, chain indexing, and reconciliation of on-chain data.
- Integrate with DeFi protocols, oracles, and bridges safely, with robust failure handling and monitoring.
- Write clean, well-tested code - unit, integration, and contract testing (Foundry/Hardhat) - and contribute to CI/CD pipelines and observability.
- Participate in design reviews and technical discussions, contributing to architecture decisions within your squad.
- Work closely with Security, Risk, and Compliance to ensure everything shipped meets the bar of a regulated bank.
- Support production systems: participate in on-call rotations, debug incidents, and contribute to root-cause analysis and fixes.
- Collaborate with product managers and designers to translate requirements into reliable, scalable solutions.
- Keep current with the Web3 ecosystem - new standards, tooling, and best practices - and share learnings with the team.
Required Experience & Skills :
- 5+ years of software engineering experience, with 1 - 2+ years building blockchain, Web3, or DeFi systems (production experience preferred).
- Hands-on smart contract development experience (Solidity/EVM) and familiarity with modern tooling (Foundry, Hardhat).
- Strong backend skills in at least one of: TypeScript/Node.js, Go, Rust, Java/Kotlin, or Python - with solid grounding in distributed systems fundamentals.
- Understanding of wallet infrastructure, transaction signing, and chain indexing; exposure to key management (MPC/HSM/multisig) a plus.
- Working knowledge of DeFi primitives - AMMs, lending, staking, stablecoins, oracles - and their integration considerations.
- Experience with cloud platforms (AWS or Azure), containers/Kubernetes, and CI/CD pipelines.
- Security-conscious engineering habits: secure coding, thorough testing, and audit-ready contract development.
- Strong ownership and delivery track record as a senior individual contributor within a squad.
- Good communication skills; comfortable collaborating across engineering, product, and control functions.
Preferred Qualifications :
- Experience in a crypto exchange, Web3 protocol team, or blockchain-focused startup environment.
- Contributions to open-source Web3 projects, hackathons, or personal on-chain projects.
- Prior experience in fintech or regulated financial services.
- Familiarity with account abstraction (ERC-4337), L2s/rollups, or cross-chain messaging.
What We Offer :
- The opportunity to build a regulated bank's digital asset platform from the ground up, with real production scale.
- A high-ownership, fast-moving environment with direct exposure to senior leadership.
- Competitive compensation and benefits aligned to the Gurgaon market.
Skills
Solidity, Blockchain, Node.js, Rust, AWS, Golang, Web3.js, Python, Emerging Technologies, Smart Contract, DeFi Protocols