Senior Staff/Staff Cryptography Engineer

Who We Are At OKX, we believe that the future will be reshaped by crypto, and ultimately contribute to every individual's freedom. OKX is a leading crypto exchange, and the developer of OKX Wallet, giving millions access to crypto trading and decentralized crypto applications (dApps). OKX is also a trusted brand by hundreds of large institutions seeking access to crypto markets. We are safe and reliable, backed by our Proof of Reserves. Across our multiple offices globally, we are united by our core principles: We Before Me, Do the Right Thing, and Get Things Done. These shared values drive our culture, shape our processes, and foster a friendly, rewarding, and diverse environment for every OK-er. OKX is part of OKG, a group that brings the value of Blockchain to users around the world, through our leading products OKX, OKX Wallet, OKLink and more. Responsibilities • Design, assess migration paths for, and implement post-quantum cryptography (PQC) algorithms within existing signature and key management systems; track the latest developments in cutting-edge PQC standards such as lattice-based cryptography • Design and develop the underlying cryptography library for MPC wallet / Web3 security products • Research Web3-ecosystem cryptography technologies and produce technology selection reports and related technical documentation • Conduct security audits of wallet-layer signature code and cryptographic protocol implementations • Participate in defining the team's cryptography technical standards and enforce security red lines for cryptography-related code Requirements • Master's degree or above in Cryptography, Mathematics, Computer Science, Cybersecurity, or a related field • Solid theoretical foundation in cryptography, including public-key cryptosystems, symmetric/asymmetric cryptography principles, lattice theory fundamentals, security protocol design, and blockchain cryptography applications • In-depth research experience in post-quantum cryptography; familiar with lattice-based cryptography and hash-based signatures; knowledge of NIST PQC standard algorithms (Kyber, Dilithium, SPHINCS+, etc.); experience with algorithm migration or engineering implementation is a plus • In-depth research experience in secure multi-party computation (MPC); familiar with threshold signature and secret sharing protocol principles and engineering implementation • Some research background in zero-knowledge proofs (e.g., zk-SNARK/zk-STARK), homomorphic encryption, or related cryptographic theory • Proficient in at least one of: C/C++, Rust, Go, or Java Nice-to-Haves • Published papers at international cryptography conferences • Fluent English (listening, speaking, reading, writing) Perks & Benefits • Competitive total compensation package • L&D programs and Education subsidy for employees' growth and development • Various team building programs and company events • Wellness and meal allowances • Comprehensive healthcare schemes for employees and dependants • More that we love to tell you along the process! Notice: All official OKX vacancies are published on this website. While roles may appear on selected third-party platforms from time to time, information on other sites may be inaccurate or outdated. If in doubt, please apply directly through our official careers website. Information collected and processed as part of the recruitment process of any job application you choose to submit is subject to OKX's Candidate Privacy Notice.