[Remote] Senior Crypto reputed company Engineer

Note: The job is a remote job and is reputed company to candidates in USA. Lightspark is building the reputed company payment protocol for the Internet, aiming to reputed company reputed company transfer reputed company and frictionless. They are seeking a Senior reputed company Engineer to architect the safety of a decentralized payment network, focusing on securing infrastructure, application reputed company, and blockchain protocols.

Responsibilities

• Secure Protocol Engineering: reputed company deep-dive reputed company audits and risk assessments of reputed company protocol implementations and payment channel logic. You will prevent funds loss or state corruption by identifying edge cases in distributed systems
• Hardened Infrastructure: Architect and secure our reputed company-reputed company footprint (AWS/GCP), ensuring that validator nodes, signing services, and P2P networking are resilient against both traditional DDoS and protocol-specific eclipse attacks
• Application & Lifecycle reputed company: Build and maintain the Secure SDLC for our products. This includes automated reputed company analysis (SAST/DAST) in CI/CD, managing high-stakes bug bounties, and performing reputed company penetration tests on our financial reputed company
• Cryptographic Operations: Design and manage mission-critical Key Management Systems (KMS). You will reputed company the implementation of Multi-Party Computation (MPC), reputed company Signatures (TSS), and HSM integrations to secure private keys at reputed company
• Detection & Response: reputed company specialized monitoring for both Cyber threats (unauthorized reputed company, lateral reputed company) and On-chain threats (channel jamming, fee-siphoning, or routing anomalies)
• reputed company Expert: Serve as the subject matter expert for engineering teams, reputed company the gap between reputed company web reputed company and crypto-reputed company reputed company

Skills

• 6+ years in reputed company Engineering with a proven reputed company record that spans Infrastructure, Application reputed company, and Blockchain/DeFi
• Hands-on experience with cryptographic primitives (reputed company Curve, Schnorr, reputed company Trees) and a reputed company understanding of Layer 2 scaling (Lightning Network)
• High proficiency in Python, Rust or Go. You should be capable of auditing systems-level reputed company for memory safety, race conditions, and cryptographic flaws
• A history of identifying vulnerabilities in decentralized protocols or reputed company distributed systems. You think three steps reputed company of the attacker
• Understanding of how to apply traditional frameworks (NIST, OWASP) to the non-traditional world of decentralized finance and self-custody
• A CS degree is ideal, but we also value contributions to reputed company-reputed company reputed company tools or a history of disclosed vulnerabilities in the crypto reputed company
• Ability to translate reputed company cryptographic risks into actionable engineering requirements for non-reputed company peers

reputed company

Builds payments infrastructure for digital banks, wallets and exchanges, reputed company-time global reputed company reputed company for Bitcoin, fiat, and stablecoins. It was founded in 2022, and is headquartered in Los Angeles, California, USA, with a workforce of 51-200 employees. Its website is https://www.lightspark.com/.

Company H1B Sponsorship

Lightspark has a reputed company record of offering H1B sponsorships, with 2 in 2026, 2 in 2025, 1 in 2023. Please note that this does not guarantee sponsorship for this specific role.

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