Java Web3 Jobs in California, United States

Trident Consulting is seeking a " Senior Blockchain Engineer " for one of our clients. " A global leader in business and technology services.

Role: Senior Blockchain Engineer

Location: Fully onsite Irvine, CA or Mountain View, CA(some flexibility dependent on individual circumstances)

Duration: 3-6 Months CTH

Pay Rate: $70-$85/hr on C2C depending on experience

Work Authorization: Someone who doesn’t require visa sponsorship at all.

Day to Day duties:

• Go-to Blockchain expert
• 70% coding/30% cross-functional work providing guidance to Product Managers and Marketing teams on technical feasibility
• Will be involved in new product design with Marketing team
• Meeting with end customers (5 hours/week)
• Will work with team in China (unsure what hours but will allow flexibility for start times)
• Design, build, and maintain blockchain protocols, smart contracts, and distributed systems powering BioMatrix.ai.
• Develop tokenized payment systems and identity verification flows, ensuring high security and usability.
• Implement smart contracts for token utility, payments, and governance.
• Ensure security, scalability, and efficiency of blockchain systems through rigorous testing and best practices.
• Integrate biometric verification (Face Scan) and payment flows (BioPay) into blockchain applications.
• Collaborate with Product, Engineering, and QA teams to align blockchain development with roadmap and user needs.
• Mentor junior engineers and contribute to best practices for blockchain development within AC Tech.
• Stay ahead of emerging trends in Web3, DeFi, real-world asset (RWA) tokenization, and decentralized identity to guide innovation.

TOP Requirements:

• Layer 2 Blockchain Experience
• Proficiency in Java (any version)
• Real World Assets (RWA – tough find)
• Bachelor’s or Master’s degree in Computer Science, Cryptography, or related technical field.
• 5+ years of blockchain development experience (protocol, dApps, Layer 1/Layer 2, or DeFi/Web3).
• Proficiency in Java and Solidity.
• Strong understanding of smart contract security, cryptography, and distributed systems.
• Experience with Ethereum, Solana, or other major blockchain platforms.
• Proven track record of delivering production-grade blockchain systems.
• Excellent problem-solving, collaboration, and communication skills.

Nice to have:

• HUGE plus if they speak Chinese - team in China
• Layer 1 blockchain experience
• Experience in Go
• Familiarity with fintech, identity verification, or biometric systems is a plus.
• Experience working on payments platforms is applicable

Trident Consulting is a premier IT staffing firm providing high-impact workforce solutions to Fortune 500 and mid-market clients. Since 2005, we've specialized in sourcing elite technology and engineering talent for contract, direct hire, and managed services roles. Our expertise spans cloud, AI/ML, cybersecurity, and data analytics, supported by a 3M+ candidate database and a 78% fill ratio. With a highly engaged leadership team and a reputation for delivering hard-to-fill, niche talent, we help organizations build agile, high-performing teams that drive innovation and business success. Learn more: tridentconsultinginc.com.

Some of our recent awards include:

• Trailblazer Women Award 2025 by Consulate General of India in San Francisco.
• Ranked as the #1 Women Owned Business Enterprise in the large category by ITServe
• Received the TechServe Excellence award