Security Researcher and Engineer (Cryptography)

HashCloak Inc is a R&D lab and consultancy focused on privacy, anonymity and scalability for blockchains and cryptocurrencies. Founded in 2019, our team is well-known for working on state of the art Ethereum projects such as Ethereum 2.0, Shyft Network and Althea, for pioneering optimistic rollups and bringing forth the first empirical analysis of Ethereum’s privacy guarantees and applications.

At HashCloak, currently, everyone is involved in conducting audits and security research for our clients. However, as we are currently in the midst of launching a few core products in our transition to a product and services company, we are seeking to build out a core security and audit team that will assist with both internal security needs and client’s needs. As such, we are seeking a security researcher and engineer specializing in cryptography (mainly Zero-Knowledge Proofs and MPC) in order to kick-off this internal restructuring!

Your main responsibilities will be mainly conducting audits with our clients and helping out with internal security reviews of HashCloak’s cryptography enabled products. Further, you will conduct research and build tooling that will help with the auditing process in addition to keeping up with the ongoings of securing using and implementing cryptography!

Our team is interested in many exiciting areas at the intersection of cryptography, game theory, and finance, such as anonymous networking, private information retrieval, and zero-knowledge proofs. You will be working with a small, and international team based in different time zones around the world. We are a remote-only company and have a very flexible and relaxed culture.

Responsibilities

• Work directly with clients in providing cryptographic expertise (designing new protocols, verifying cryptographic proofs, auditing cryptographic implementations)
• Setup internal processes to facilitate the auditing of cryptographic code
• Work directly with the various internal HashCloak teams with cryptography related expertise
• Learn and experiment with new tooling and techniques for finding vulnerable code and integrate your learnings into our auditing process
• Keep up to date on cryptographic research and tooling

Qualifications

• Master’s degree or above in cryptography, computer science, mathematics or related fields or equivalent experience
• 1+ years of experience in applied cryptography and cryptanalysis in an industrial setting
• Ability to read, understand and write cryptographic proofs (e.g. game-based proofs, universal composability, etc)
• 2+ years experience in one of the following: Go, Rust, C/C++ or Python
• Great written and verbal communication skills in English
• 3+ months experience with ZKP programming tools like Circom, Cairo, Leo, etc
• 3+ months experience with MPC programming tools like MP-SPDZ, SCALE-MAMBA, etc
• (OPTIONAL) Experience reading and writing smart contracts for a major blockchain (particularly, Ethereum, Solana, Cosmos)
• (OPTIONAL) Have a cryptography publication (Posting on ePrint is sufficient but it would be really cool if your paper got accepted to a conference or journal)

To Apply

If you are interested in this role, please send an email to Mikerah at with a resume/CV along with something interesting you have built or published. We would love to see some of your previous projects, including open source projects, publications, etc., which would help showcase the highlights of your career.