Polar Bear Systems. is hiring a

Blockchain Cybersecurity Specialist

Company Description

Polar Bear Systems (PBS) is a Web(n) Blockchain development organization founded in July 2019. PBS aims to bring clients to a below-freezing chilled state by providing innovative solutions. The company strives to offer solutions that elevate clients to their maximum potential.

Role Description

This is a volunteer hybrid position for a Blockchain Cybersecurity Specialist at Polar Bear Systems, located in Cambridge, MA, with the option for remote work. The Specialist will be responsible for day-to-day tasks related to application security, cybersecurity, network security, and information security in the blockchain domain.

Key Responsibilities

• Proven experience in blockchain security, penetration testing, or secure protocol design.
• Hands-on experience with smart contract auditing tools (MythX, Slither, Foundry, Hardhat).
• Strong understanding of:
• EVM-based chains (Ethereum, BSC, Polygon)
• Layer 2 rollups and cross-chain bridges
• Consensus mechanisms (PoW, PoS, PoH, PoA)
• Familiarity with Solidity, Rust, or Go.
• In-depth knowledge of cryptographic protocols (SHA, ECDSA, BLS, Merkle Trees).
• Knowledge of Web3 authentication and wallet infrastructure (Metamask, WalletConnect, Ledger).
• Experience with DevSecOps practices and CI/CD pipelines.
• Strong communication and documentation skills.

Qualifications

• Experience with ZK-SNARKs, MPC, or post-quantum cryptography.
• Background in traditional cybersecurity (CISSP, OSCP, CEH a plus).
• Contributions to blockchain or open-source security projects.
• Familiarity with KYC/AML, zero-knowledge identity, and compliance tooling.

Tools & Technologies You’ll Use

• Solidity, Rust, Go
• Hardhat, Foundry, Mythril, Slither
• Wireshark, Metasploit, Burp Suite
• OpenZeppelin, Certora, Chainlink, Forta
• GitHub, GitLab CI/CD, AWS, Docker, Kubernetes

Why Join Us

• Be at the frontier of Web3 security innovation
• Competitive compensation + token equity (if applicable)
• Collaborative, fully remote culture with growth opportunities
• Access to high-impact projects across DeFi, DAOs, NFTs, and L2s

Apply Now: