Senior Java Engineer, Blockchain Platforms Texas, Southlake 09/08/2026 Contract Active

Job Summary:

The Senior Java Engineer, Blockchain Platforms will build and integrate blockchain infrastructure that supports digital asset custody and tokenization platforms. This hands-on engineering role focuses on Layer 1 blockchain integration, core blockchain infrastructure services, wallet engineering, and custody-related blockchain workflows. The engineer will work closely with custody, security, and platform teams to ensure blockchain interactions are secure, reliable, observable, resilient, and production-ready.

Key Responsibilities:

• Integrate enterprise systems with existing Layer 1 blockchains, including Ethereum-based and other relevant Layer 1 networks.
  
• Evaluate and contribute to extending Layer 1 blockchain capabilities to address custody, scalability, and resiliency requirements.
  
• Apply knowledge of transaction lifecycles, finality, forks, reorganizations, and event propagation.
  
• Ensure blockchain integrations remain reliable under production loads and stress conditions.
  
• Design and develop core blockchain infrastructure services, including indexers, event processors, block explorers, observability tools, chain data services, APIs, and interoperability components.
  
• Build accurate, performant, and auditable blockchain data pipelines.
  
• Develop operational tooling for troubleshooting, monitoring, and incident response.
  
• Contribute to wallet architecture and development, including blockchain-facing wallet services, transaction creation, signing workflows, and submission pipelines.
  
• Integrate wallet services with custody key management technologies such as MPC, HSMs, and signing services.
  
• Maintain separation between blockchain protocol logic, security controls, and business rules within wallet implementations.
  
• Partner with custody and security engineers to validate end-to-end transaction flows.
  
• Support custody-related blockchain workflows, including on-chain transaction execution, event monitoring, reconciliation, and chain-specific failure recovery.
  
• Help define secure patterns for interacting with smart contracts and token standards from custody platforms.
  
• Ensure blockchain workflows align with custody policies, approvals, and risk controls.
  
• Apply modern engineering practices to build reliable, testable, and observable blockchain services.
  
• Leverage GenAI and agentic AI tools to support protocol analysis, software development, testing, documentation, and knowledge sharing.
  
• Maintain engineering rigor and ensure development speed does not compromise correctness, security, or reliability.

Required Qualifications:

• 7+ years of professional software engineering experience.
  
• Hands-on experience building or integrating blockchain or distributed ledger systems.
  
• Strong understanding of Layer 1 blockchain protocols and transaction lifecycles.
  
• Experience building backend services, APIs, and infrastructure components.
  
• Proficiency in one or more programming languages such as Java, Go, Rust, Python, or similar.
  
• Strong understanding of distributed and asynchronous systems.
  
• Ability to work effectively across custody, security, and platform engineering teams.
  
• Strong debugging and problem-solving skills in complex distributed environments.

Preferred Qualifications:

• Experience with blockchain indexers, explorers, or chain analytics systems.
  
• Familiarity with wallet architecture and blockchain signing workflows.
  
• Exposure to crypto custody platforms or security-sensitive financial systems.
  
• Experience working with MPC, HSMs, or other institutional key-management and signing technologies.
  
• Experience with smart contracts and token standards.
  
• Strong debugging instincts in distributed and asynchronous environments.
  
• Experience using AI tooling to support complex software development.