Cyber Security Developer - Expert

Job Summary

Location:

Southlake, Texas
Job Type: Contract
Salary: $79.00 - $84.37 per hour

Work Hours:

9am to 5pm

Education:

Bachelor’s Degree

• Design, implement, and evolve institutional‑grade key management architectures, including HSMs, Multi‑Party Computation, and secure key generation, storage, rotation, signing, and recovery.
• Define trade‑offs and architectural patterns across hot wallet, warm wallet, and cold storage models.
• Ensure cryptographic designs align with regulatory, security, and audit expectations.
• Partner closely with Cybersecurity and Risk to embed defense‑in‑depth and zero‑trust principles into custody design.

• Lead the design of the Custody Policy Engine governing authorization, approvals, limits, segregation of duties, transaction controls, and exception handling.
• Implement policy versioning, auditability, and enforce ability.
• Translate business, legal, and risk requirements into clear, enforceable technical controls.
• Serve as a trusted technical advisor on custody governance topics.

• Own custody‑specific disaster recovery strategies, including key recovery, quorum loss scenarios, and chain events.
• Author and maintain incident response and recovery runbooks for custody‑related failures or security events.
• Partner with Operations, Security, and SRE to ensure practicable, tested recovery procedures.
• Lead post‑incident technical analysis, root‑cause reviews, and long‑term remediation strategies.

• Act as the custody architecture authority, ensuring consistency across wallets, blockchains, environments, and platforms.
• Identify architectural and operational risks early; propose mitigation strategies with clear trade‑offs.
• Ensure custody designs scale across assets, chains, and future tokenized products.
• Influence enterprise standards by raising the bar on security, resilience, and technical rigor.

• Leverage GenAI and agentic AI tools to accelerate architecture design, threat modeling, documentation, testing, and reviews.
• Set expectations for AI‑assisted engineering rigor‑speed with correctness, not shortcuts.
• Partner with engineering teams to raise architecture, code, and documentation quality across custody components.

• 10+ years of software engineering experience, with deep specialization in security‑sensitive or cryptographic systems.
• Hands‑on experience with HSMs, MPC frameworks, and secure key management systems.
• Experience with Web3 security tooling such as Slither, Mythril, Foundry fuzzing.
• Experience with common cryptography implementation languages such as C, C++, Rust, Go.
• Experience collaborating with security auditors (e.g., Trail of Bits, Halborn).
• Proven ability to design systems where failure has material risk implications.
• Strong grounding in distributed systems, secure architectures, and fault‑tolerant design.
• Track record of acting as a technical authority without formal people management.

• Experience with crypto custody, digital asset platforms, or blockchain infrastructure.
• Prior ownership of incident response, disaster recovery design, or security runbooks.
• Ability to articulate risk‑based trade‑offs clearly to technical and non‑technical stakeholders.
• Systems thinker connecting technology, security, policy, and operations.
• Comfortable challenging assumptions and raising concerns early in high‑stakes environments.
• Experience applying AI tools to complex engineering workflows.

• Custody key management and policy systems are secure, resilient, auditable, and trusted.
• Failure modes are well understood, modeled, and operationally prepared for.
• Incidents are handled with clarity, speed, and technical confidence.
• Custody architecture scales across assets, chains, and tokenized products without erosion of risk posture.
• The role is viewed as the technical backbone of Schwab's digital‑asset custody strategy.

We are an equal opportunity employer. All qualified applicants will receive consideration for employment without regard to race, color, religion, sex, sexual orientation, gender identity, national origin, age, disability, or veteran status.