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Senior Blockchain Developer

USquareKalyan-Dombivli, IN

30+ days ago

Job description

Hiring : Senior Backend + Smart Contract Developer (Web3)

We’re looking for a highly experienced Backend + Smart Contract Developer with a strong grasp of blockchain architecture and mid-level AWS expertise to join our innovative Web3 team. This is your chance to design and build cutting-edge decentralized systems that scale globally.

Key Responsibilities

Smart Contract Development :
Architect, develop, and deploy secure smart contracts (Solidity / Rust) for Ethereum, EVM-compatible chains, and other L1 / L2 networks.
Conduct in-depth testing, auditing, and gas optimization.
Backend Engineering & Blockchain Architecture :
Design high-performance backend systems and scalable blockchain architectures.
Build and maintain APIs, node integrations, and indexing services (e.g., The Graph, Alchemy, Infura).
Cloud & Infrastructure (AWS) :
Deploy and manage backend services using AWS (EC2, Lambda, API Gateway, S3, RDS) and cloud best practices.
Implement CI / CD pipelines, containerization (Docker, Kubernetes), and monitoring solutions.
Security & Optimization :
Ensure system security, resilience, and gas optimization.
Apply best practices for mitigating vulnerabilities (reentrancy, overflow, etc.).
Collaboration & Ownership :
Work closely with frontend, DevOps, and product teams to deliver robust end-to-end blockchain products.
Take complete ownership from architecture to deployment.

Must-have Qualifications

4+ years in backend development and 2+ years in smart contract development.

Deep understanding of Ethereum, EVM architecture, L2 scaling solutions, and DeFi / NFT standards (ERC20, ERC721, ERC1155).

Proficiency in Solidity, JavaScript / TypeScript, Node.js, and at least one systems language (Go, Rust, or C++).

Strong experience in blockchain solution architecture for scalable dApps.

Mid-level experience with AWS (EC2, Lambda, API Gateway, S3, RDS).

Familiarity with common smart contract vulnerabilities and mitigation strategies.

Proven ability to deliver secure, scalable, production-ready blockchain systems.

Preferred Qualifications

Experience with Hardhat, Foundry, Truffle, Web3.js / Ethers.js.

AWS DevOps experience for blockchain-based apps, including CI / CD pipelines and container orchestration.

Cross-chain development and interoperability protocol expertise.

Knowledge of zero-knowledge proofs (ZK-SNARKs / STARKs).

Experience with audited DeFi protocols.

Familiarity with L2 rollups, bridges, and advanced blockchain scaling techniques.

Exposure to NFTs, DeFi mechanics, and modern blockchain infrastructure.

📍 Location : Remote / Hybrid (India preferred)

📌 Type : Full-time

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Blockchain Developer • Kalyan-Dombivli, IN

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