Solidity Jobs

Role: Blockchain Developer / Blockchain Developer Lead (Java)

Location: New York / New Jersey (Onsite)

Position Type: Full-Time

Salary: Open

Job Overview

Discover your future at finance domain.

Working at company in finance is far more than just a job. A career with us means joining a team of more than 230,000 dedicated people from around the globe. At company, you'll have the opportunity to grow your career, give back to your community, and make a real impact.

Job Description

Key Responsibilities

Design, develop, and deploy Web3 components and integrations for company's Digital Asset Platform, including smart contracts, on-chain event listeners, wallet integrations, and blockchain protocol connectors.

Build and maintain backend services that interface with public and permissioned blockchain networks (e.g., Ethereum, Hyperledger Besu, Corda, or equivalent).

Develop, test, and audit smart contracts written in Solidity or equivalent languages, ensuring security, correctness, and gas efficiency.

Integrate Web3 libraries and SDKs (e.g., Web3J, Web3JS, Ethers.js, Viem) into enterprise Java and/or Node.js backend services.

Implement asynchronous, event-driven architectures to handle on-chain events, transaction lifecycle management, and blockchain state synchronization.

Collaborate with architects and senior engineers to contribute to the design of scalable, secure, and resilient Web3 infrastructure.

Participate in code reviews, providing and receiving constructive technical feedback to maintain high engineering standards.

Support the integration of digital asset custody solutions, tokenization frameworks, and DeFi/TradFi bridging components.

Contribute to technical documentation, including smart contract specifications, integration guides, and architecture notes.

Stay current with the rapidly evolving Web3 ecosystem by tracking protocol upgrades, new token standards, Layer 2 solutions, and emerging tooling relevant to institutional use cases.

Work within Agile/Scrum frameworks, participating in sprint planning, stand-ups, and retrospectives within a distributed global team.

Help identify and resolve technical issues across the Web3 stack, escalating where appropriate to ensure delivery quality and timelines.

Qualifications & Experience

Bachelor's degree in Computer Science, Engineering, or a related discipline; MS is a plus.

8+ years of overall software engineering experience with a strong backend development foundation.

2–4 years of hands-on experience in Web3 and blockchain application development, including smart contract development and blockchain protocol integration.

3–5 years of experience with backend development using Java/Spring, Node.js, or equivalent enterprise frameworks.

Proficiency in Solidity smart contract development, including testing frameworks (Hardhat, Foundry, Truffle) and security best practices.

Hands-on experience with Web3 libraries such as Web3J, Web3JS, Ethers.js, or Viem.

Solid understanding of blockchain fundamentals, including consensus mechanisms, transaction lifecycle, gas models, wallet infrastructure, and key management.

Experience with token standards (ERC-20, ERC-721, ERC-1155, ERC-3525, or equivalent) and tokenization patterns.

Familiarity with permissioned blockchain networks (Hyperledger Besu, Fabric, Corda, or R3) is a strong plus.

Experience with asynchronous programming, event-driven systems, and message queuing (Kafka, RabbitMQ, or equivalent).

Familiarity with DevOps practices, containerization (Docker, Kubernetes), and CI/CD pipelines.

Understanding of cryptographic concepts including digital signatures, hashing, PKI, and secure key management as applied to blockchain systems.

Exposure to Layer 2 scaling solutions (Polygon, Optimism, zkSync, etc.) and cross-chain interoperability protocols is a plus.

Experience in financial services or regulated industries is a plus.

Familiarity with Agile/Scrum methodologies and distributed team collaboration tools.

Competencies & Skills

Web3 Engineering Depth

Strong command of the Web3 technology stack, from smart contract development to on-chain/off-chain integration patterns and blockchain node interaction.

Backend Engineering Fundamentals

Solid grounding in enterprise software engineering, including API design, microservices, data structures, algorithms, and design patterns.

Security Mindset

Awareness of common smart contract vulnerabilities (reentrancy, front-running, integer overflow, etc.) and best practices for secure on-chain development.

Curiosity & Adaptability

Genuine enthusiasm for the Web3 ecosystem and the ability to rapidly learn and apply new protocols, standards, and tooling.

Collaborative Spirit

Strong team player who communicates clearly and constructively with engineers, architects, and non-technical stakeholders.

Delivery Orientation

Ability to manage personal delivery commitments, prioritize effectively, and produce high-quality output within sprint cycles.

Attention to Detail

Rigorous approach to testing, code quality, and documentation, particularly important given the immutable nature of on-chain deployments.

Tooling Proficiency

Working knowledge of engineering tools including:

Git

Jira

Jenkins

Hardhat / Foundry

Docker

Helm

Observability platforms