Job Title

Senior Blockchain Engineer (x2)

Location

Fully onsite in Irvine or Mountain View, CA; flexibility dependent on individual circumstances

Interview Process

3 Interviews, virtual okay, ideally one onsite

• 1st round w/Key Stakeholder
• 2nd w/ technical stakeholder
• 3rd w/ HR

Project Description

Senior Blockchain Engineer will architect and implement the blockchain foundation of the BioMatrix.ai ecosystem . They will design secure, scalable, and user-friendly blockchain solutions that integrate biometric identity, payments, and data services.

This is a hands-on engineering role for someone who has deep blockchain expertise , thrives in 0 1 innovation , and is motivated to build real-world applications at global scale. Will work on upcoming projects around Real World Assets (RWA).

Duties/Day to Day Overview

• • Reports to CTO - interim
  • 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

(Must haves)

• • 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.

Additional Qualifications

(Nice to Haves)

• • 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 at Stripe or other payments platforms is applicable

S

• • AVOID: AI Engineers (okay with AI experience but needs blockchain)
  • Cooper describes AC Technology as a "fun startup trying to change the world"
  • Selling Points:
    • Interesting startup with ideas of how the world can be changed
    • Irvine office gets lunch daily
    • Lots of opportunities to develop engineers - growth in skillset, go to activities, events, founder sponsors a lot of events
    • One of the first US-based engineers
    • Can make fancy titles work
  • Financial Stability - Stable as a startup, has enough cash flow, runway goes until 2028, salary can offer equity, cryptocurrency
  • Excited to work on blockchain systems that combine identity, payments, and real-world applications.
  • Comfortable with ambiguity, thrives in 0 1 environments, and moves quickly.
  • Obsessed with trust, reliability, and protecting user data.
  • Believes in AC Tech's mission of building secure and inclusive digital ecosystems.