Blockchain Engineer

Ethereum Technologies LLC; Jersey City (NJ); On-site; USD 77,000 - 105,000; Full time

Job summary

Ethereum Technologies in Jersey City, NJ, seeks a Blockchain Engineer to design and implement Web3 platform services for tokenization and asset management. You will work on backend systems that connect to blockchain nodes, smart contracts, and custody platforms, enabling enterprise-grade digital assets workflows.

The role covers integration with Ethereum/EVM networks, Hyperledger Besu, Canton/Daml, and Layer 2 technologies, with a focus on secure, scalable production deployments in a dynamic

Qualifications

• Experience designing and building blockchain-based services.
• Knowledge of Ethereum/EVM and Hyperledger Besu ecosystems.
• Experience with Smart Contracts and tokenized assets.
• Familiarity with Layer 2 networks and permissioned blockchains.
• Proficiency with JSON-RPC and WebSocket APIs for blockchain apps.
• Understanding of secure development practices for blockchain systems.

Responsibilities

• Design and build reusable Web3 platform services for tokenization, blockchain connectivity, wallet integration, transaction processing, event ingestion, indexing, and token lifecycle management.
• Develop backend services that interact with blockchain nodes, smart contracts, custody platforms, signing systems, and off-chain enterprise applications.
• Build blockchain abstraction layers supporting Ethereum/EVM, Hyperledger Besu, Canton/Daml, Layer 2 solutions, permissioned networks, and consortium blockchains.
• Implement blockchain integrations using JSON-RPC, WebSocket subscriptions, smart contract queries, transaction submission, status tracking, and event log processing.
• Engineer and maintain connectivity solutions for Hyperledger Besu, Ethereum-compatible networks, and permissioned EVM-based blockchain ecosystems.
• Support Canton/Daml-based blockchain workflows including participant connectivity, transaction authorization, application lifecycle management, and workflow integration.
• Manage Daml application packages, including deployment, versioning, validation, installation, and production enablement processes.
• Design, develop, integrate, and review smart contracts for tokenized assets, programmable workflows, and digital asset platforms.
• Build smart contract interaction frameworks for ABI encoding/decoding, transaction simulation, calldata generation, event processing, and contract state management.
• Establish engineering standards for smart contract development, testing, deployment, version control, governance, rollback planning, and production releases.
• Implement smart contract security best practices including threat modeling, static code analysis, fuzz testing, invariant testing, and secure deployment pipelines.
• Integrate institutional wallet, custody, signing, and authorization platforms to support blockchain-based asset management and transaction workflows.
• Design transaction orchestration services covering validation, approval routing, policy enforcement, signing, submission, confirmation tracking, exception handling, and audit logging.
• Develop and maintain address management, transaction limit controls, allowlists, approval workflows, signing policies, and operational governance mechanisms.
• Collaborate with platform, infrastructure, security, and operations teams to design scalable, secure, and production-ready Web3 solutions for enterprise digital asset and tokenization platforms.

Skills

Web3

Blockchain

Smart contracts

Ethereum/EVM

Hyperledger Besu

Canton/Daml

Layer 2

JSON-RPC

WebSocket

Job description

US Citizen, Green Card, H-1B, OPT-EAD, CPT, Other

Job Title:Blockchain Engineer

Location: Jersey City, NJ

Duration: 8 Months + Extension

Bill Rate: $66/hour (C2C)

Job Type: W-2, 1099, C2C

Client: To Be Discussed Later

Work Authorization: US Citizen, Green Card, OPT-EAD, CPT, H-1B, H4-EAD, Other

Job Summary:

Key Responsibilities:

• Design and build reusable Web3 platform services for tokenization, blockchain connectivity, wallet integration, transaction processing, event ingestion, indexing, and token lifecycle management.
• Develop backend services that interact with blockchain nodes, smart contracts, custody platforms, signing systems, and off-chain enterprise applications.
• Build common blockchain abstraction layers supporting Ethereum/EVM, Hyperledger Besu, Canton/Daml, Layer 2 solutions, permissioned networks, and consortium blockchains.
• Implement blockchain integrations using JSON-RPC, WebSocket subscriptions, smart contract queries, transaction submission, status tracking, and event log processing.
• Engineer and maintain connectivity solutions for Hyperledger Besu, Ethereum-compatible networks, and permissioned EVM-based blockchain ecosystems.
• Support Canton/Daml-based blockchain workflows including participant connectivity, transaction authorization, application lifecycle management, and workflow integration.
• Manage Daml application packages, including deployment, versioning, validation, installation, and production enablement processes.
• Design, develop, integrate, and review smart contracts for tokenized assets, programmable workflows, and digital asset platforms.
• Build smart contract interaction frameworks for ABI encoding/decoding, transaction simulation, calldata generation, event processing, and contract state management.
• Establish engineering standards for smart contract development, testing, deployment, version control, governance, rollback planning, and production releases.
• Implement smart contract security best practices including threat modeling, static code analysis, fuzz testing, invariant testing, and secure deployment pipelines.
• Integrate institutional wallet, custody, signing, and authorization platforms to support blockchain-based asset management and transaction workflows.
• Design transaction orchestration services covering validation, approval routing, policy enforcement, signing, submission, confirmation tracking, exception handling, and audit logging.
• Develop and maintain address management, transaction limit controls, allowlists, approval workflows, signing policies, and operational governance mechanisms.
• Collaborate with platform, infrastructure, security, and operations teams to design scalable, secure, and production-ready Web3 solutions for enterprise digital asset and tokenization platforms.

We are an equal opportunity employer. All aspects of employment including the decision to hire, promote, discipline, or discharge, will be based on merit, competence, performance, and business needs. We do not discriminate on the basis of race, color, religion, marital status, age, national origin, ancestry, physical or mental disability, medical condition, pregnancy, genetic information, gender, sexual orientation, gender identity or expression, national origin, citizenship/ immigration status, veteran status, or any other status protected under federal, state, or local law.