Job Title : Staff/Lead Engineer (Blockchain & DeFi)

Function : Technology - Engineering

Location : Gurgaon, India

Employment Type : Full-time

Key Responsibilities :

- Design and build production-grade smart contracts and protocol integrations (EVM/Solidity; other chains as required), from architecture through deployment and upgrade management.
- Architect wallet, custody, and transaction-orchestration services - key management integration (MPC/HSM/multisig), signing flows, nonce and gas management, and chain indexing.
- Build robust backend services and APIs (microservices, event-driven architecture) that bridge on-chain activity with the bank's core platforms, ledgers, and compliance systems.
- Own technical decisions end-to-end : system design, trade-off analysis, technology selection, and architecture reviews for the digital asset stack.
- Integrate with DeFi protocols, liquidity venues, oracles, and bridges safely - including failure handling, reconciliation, and monitoring of on-chain positions.
- Drive engineering excellence : coding standards, automated testing (including contract testing and fuzzing), CI/CD, observability, and infrastructure-as-code.
- Partner closely with Security (including the Security Architect - DeFi), Risk, and Compliance to ship products that meet the bar of a regulated bank.
- Lead incident response for production issues in the digital asset stack, driving root-cause analysis and long-term fixes.
- Mentor and uplift senior and mid-level engineers; influence the technical roadmap across squads without direct people-management responsibility.
- Stay ahead of the Web3 ecosystem - evaluating new chains, standards (e.g., ERC-4337, token standards),



and tooling for adoption.

Required Experience &

Skills :

- 10 years of software engineering experience, with 3 years building blockchain, Web3, or DeFi systems in production.
- Deep hands-on experience with smart contract development (Solidity/EVM essential; Rust, Move, or Cairo a plus) and modern tooling (Foundry, Hardhat).
- Strong backend engineering skills in at least two of : TypeScript/Node.js, Go, Rust, Java/Kotlin, or Python - with proven experience designing distributed systems at scale.
- Experience with wallet infrastructure, key management (MPC/HSM), transaction signing, and chain indexing/data pipelines.
- Solid understanding of DeFi primitives - AMMs, lending, staking, stablecoins, bridges, oracles - and how to integrate them safely.
- Cloud-native engineering experience (AWS or Azure), Kubernetes, event streaming (Kafka or similar), and CI/CD at scale.
- Robust security mindset : secure coding, contract audit readiness, and threat-aware design.
- Track record of operating at Staff level - setting technical direction, leading through influence, and delivering complex systems across multiple teams.
- Excellent communication skills; able to explain deep technical choices to product, risk, and executive stakeholders.

Preferred Qualifications :

- Experience in a crypto exchange, digital-asset custodian, Web3 protocol team, or blockchain-focused startup/accelerator environment.
- Contributions to open-source Web3 projects, protocol design, or published technical work (audits, EIPs, research).
- Prior experience in fintech or regulated financial services.
- Familiarity with account abstraction, L2s/rollups, and cross-chain messaging.

📌 Delta6Labs - Staff/Lead Engineer - Blockchain & DeFi (India)
🏢 Delta6Labs FinTech
📍 India