Job responsibilities :

1. Design and implement MPC/TSS core capabilities using Rust: DKG, threshold signature, refresh, reshare, and cryptographic processes related to key recovery.
2. Support multi-curve signature requirements (at least secp256k1 ECDSA, Ed25519), and design a key derivation scheme that meets the isolation between the recharge address pool and the business Vault.
3. Implement share nodes and protocol cores into a secure operating environment (including collaboration with AWS Nitro Enclave/KMS, etc.) to improve attestation and threat models.
4. Collaborate with wallet mid-platform, security, SRE, provide stable signature API, and bind approval/allowlist/limit policies to signature session.
5. Establish test vectors, fuzz tests, and audit documents to promote third-party cryptographic audits and continuous reinforcement.
6. Technical solutions for participating in key ceremony, disaster recovery, and node replacement exercises.

Job requirements :

1. Proficient in Rust, with production and delivery experience of security-sensitive systems or cryptographic libraries.
2. Possess a solid foundation in applied cryptography, with experience in implementing/porting/deeply integrating MPC/TSS or equivalent threshold signature systems.
3. Understand the custody wallet business (address derivation, collection/withdrawal, cold and hot stratification) or have industry experience and can quickly align.
4. Possess security development awareness in TEE/Enclave or hardware isolation environments (priority given to Nitro/SGX/SEV, etc.).
5. Emphasize correctness, auditability, and key material lifecycle management; able to read protocol papers and implement projects.
6. Good cross-language collaboration ability (mid-platform mainly Java).

Bonus points :

• Experience in MPC production in payment/exchange/custody industry.
• AWS Nitro Enclave in action; HD/hardened derivation under MPC;
• Experience in multi-chain signature adaptation, cryptographic auditing, and gRPC/FFI integration.