Senior Security Engineer - xStocks
Core
Senior Security Engineer building and securing tokenized securities infrastructure across multiple blockchains (EVM, Solana, TON, Tron), balancing product engineering with end-to-end security ownership.
Role type
Senior Security Engineer (Hybrid IC)
Builds
Tokenized securities platform infrastructure (issuance, custody, settlement) on EVM, Solana, TON, and Tron
Domain
Blockchain / DeFi / Tokenized Securities
Required skills
TypeScript, Node.js, Application Security, Infrastructure Security, Cryptography, Blockchain Security (EVM, Solana, TON, Tron), Smart Contract Analysis, Penetration Testing, Threat Modeling, Key Management (HSM, MPC), IAM, Supply Chain Security
Preferred skills
Smart Contract Audit Commissioning, Cloud Security (GCP, AWS), Detection Engineering, OSCP/OSWE/GWAPT certifications, Regulated Fintech experience
Technologies
TypeScript, Node.js, EVM, Solana, TON, Tron, HSM, MPC, GCP, AWS, SIEM
Responsibilities
Own security deliverables end-to-end including audit coordination and due diligence; Run offensive assessments (pentesting) on web apps, APIs, backend, and on-chain components; Continuously assess posture via threat modeling and architecture reviews; Review code for security in auth, crypto, and custody flows; Harden platform secrets, IAM, and supply chain; Secure custody and signing workflows (MPC, HSM, permissions); Contribute to product engineering backlog; Support incident detection, triage, and response.
Seniority
Senior, hands-on IC
