Sr Applied Scientist, Amazon Cryptographic Libraries

The Amazon Cryptographic Libraries(ACL) team builds the cryptography that AWS services and a growing open-source community depend on including AWS-LC our FIPS-validated open-source cryptographic library. As an Applied Scientist on the team your primary focus will be formal verification: building machine-checked proofs that cryptographic implementations are correct. You will also contribute to algorithm implementation assembly level optimization and the adoption of post-quantum cryptography. You will work alongside senior scientists on the team building deep expertise in an environment where your proofs and code ship to effectively every AWS service. This is a role where an early-career scientist gets both rigorous mentorship and immediate production-scale impact.



Key job responsibilities
- Develop and maintain machine-checked proofs of correctness for cryptographic implementations in AWS-LC.
- Specify the functional behavior of low-level cryptographic code (Rust C assembly) in formal notation and verify it using both automatic and interactive provers such as HOL-Light Verus and CBMC.
- Apply formal methods program analysis and rigorous testing to raise the assurance bar of a security-critical widely deployed codebase.
- Contribute to the implementation and optimization of cryptographic algorithms including post-quantum algorithms (ML-KEM ML-DSA SLH-DSA) for production use.
- Assist in the career development of others actively mentoring individuals and the community on advanced technical issues.
- Publish patents and peer-reviewed articles and present your research both internally and externally

A day in the life
You take a cryptographic algorithm that needs to be provably correct and write the formal specification of its behavior the code and the proof of correctness. You develop the proof in an interactive theorem prover assisted by state-of-the-art AI models and iterate until the machine checks it end to end. Some days you are debugging a proof obligation; other days you are reading a paper on a new verification technique or helping refine an algorithm implementation so it is both fast and amenable to proof. Your proofs back code that is validated for FIPS and deployed across AWS.

About the team
ACL owns AWS-LC (Amazons FIPS-validated cryptographic library) and manages third-party cryptographic libraries. We build the cryptographic foundation under nearly every AWS service and a growing set of external open-source projects. Applied Scientists on the team own algorithm-level and assembly performance work and partner deeply with AWSs Automated Reasoning Group on formal verification.

- PhD or equivalent research experience
- Experience in any of the following areas: mathematical logic formal verification satisfiability solving (eg SAT/SMT) mechanical theorem proving model checking or program analysis

- Hands-on experience with automatic or interactive program verification tools such as HOL Light CBMC Verus or Lean.
- Experience specifying or verifying low-level software (machine code or assembly)
- Familiarity with cryptographic primitives and their implementation
- Low-level or systems programming experience in Rust C or assembly
- Familiarity with post-quantum cryptography (lattice-based code-based or hash-based schemes)

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The base salary range for this position is listed below. Your Amazon package will include sign-on payments and restricted stock units (RSUs). Final compensation will be determined based on factors including experience qualifications and location. Amazon also offers comprehensive benefits including health insurance (medical dental vision prescription Basic Life & AD&D insurance and option for Supplemental life plans EAP Mental Health Support Medical Advice Line Flexible Spending Accounts Adoption and Surrogacy Reimbursement coverage) 401(k) matching paid time off and parental leave. Learn more about our benefits at WA Seattle - 167100.00 - 226100.00 USD annually