Cryptographic Software Engineer


About Keyfactor 

Our mission is to build a connected society, rooted in trust, with identity-first security for every machine and human. Keyfactor helps organizations move fast to establish digital trust at scale — and then maintain it. With decades of cybersecurity experience, Keyfactor is trusted by more than 1,500 companies across the globe. We are proud to continually earn recognition as a Best Place to Work, and we achieve that through our amazing people who cultivate our culture as we grow. We hope you will trust your future with Keyfactor! 

Title: Cryptographic Software Engineer

Location: Remote; United States

Experience: Entry – Mid Level

Job Function: Engineering

Employment Type: Full-Time

Industry: Computer & Network Security

About The Position

Keyfactor and the Bouncy Castle team are looking for a Software Engineer/ Cryptography Specialist, to join the open-source cryptography project famous for the use of cartoon spies. You are proficient in either Java or C#, and comfortable in the other. Decent background in mathematics will help. We do not expect a zero-knowledge proof that you are the right person, but if you know what ZKP is, then you just might be.

Position favors someone who is patient, likes solving technical problems, and conquering standards documents. This is a job best approached from the point of view that you will probably never know enough, but there is plenty of scope to learn more. You will contribute to a product that is used by millions of humans and devices out there, hence the ability to patiently communicate with and provide support to non-cryptography versed engineers and users is a necessity. 

The position is based in the United States and can be performed remotely when necessary. Applicants must hold US citizen status.


  • Analysis of specifications crypto & security that are relevant to the Bouncy Castle APIs and its users.
  • Taking part of implementation of crypto & security algorithms, protocols and related components
  • Working with support for Keyfactor’s Bouncy Castle Support customers.
  • Specification and review of crypto & security architectures.
  • Attack modeling and creation of security countermeasures.
  • Root cause analysis of security defects.
  • Technical interface to customers and to the products development teams, on design, implementation and proper use of cryptographic algorithms and protocols.
  • Certification support and technical interface with evaluator and certifier bodies (FIPS, Common Criteria)

Skills and Qualifications

  • Driven and action-oriented
  • Ability to work independently, proactively, and responsibly, and to take initiative
  • Positive and customer-focused
  • Structured and organized
  • Excellent problem solving skills
  • Easily cooperates with others
  • In-depth knowledge of cryptography (e.g. has taken university courses)
  • Solid background in math (number theory, abstract algebra) and algorithms
  • Programming experience in one or more of the following languages: Java, C#, C, C++, Rust.
  • Prior experience with implementation of cryptographic protocols
  • Familiarity with the UNIX command line and developer tools (e.g., git, gradle)
  • Familiarity with reading cryptography research papers and standard documents will be considered positively
  • Knowledge in “reading and writing” ASN.1
  • Fluency in spoken and written English
  • MSc. or Ph.D. in computer science, mathematics, or a related discipline with an active interest in Cryptography will be considered positively



Salary will be commensurate with experience.  

Culture, Career Opportunities and Benefits 

We build teams that continually strive to get better than the day before. You will be challenged daily and given opportunities to grow personally and professionally. We balance autonomy and structure to create an entrepreneurial environment to spur creativity and new ideas.  

Here are just some of the initiatives that make our culture special:   

  • Second Fridays (a company-wide day off on the second Friday of every month). 
  • Comprehensive benefit coverage, paid for by the company for you and your dependents (US). 
  • Generous paid parental leave (US). 
  • Dedicated employee-focused ambassadors via Key Contributors & Culture Committees. 
  • DIVERSE Commitment, a call to action for a more inclusive and diverse future in business, society, and technology. 
  • The Keyfactor Alliance Program to support DEIB efforts. 
  • Wellbeing resources, wellness allowance, mindfulness app free membership, Wellness Wednesdays. 
  • Global Volunteer Day, company non-profit matching, and 3 volunteer days off. 
  • Unlimited time off (US) and competitive time off globally. 
  • Monthly Talent development and Cross Functional meetings to support professional development. 
  • Regular All Hands meetings – followed by group gatherings. 

Our Core Values 

Our core values are extremely important to how we run our business and what we look for in every team member:  

Trust is paramount. 

We deliver security software and solutions where trust and openness are of the highest importance for our customers. We are honest and a trusted partner in every aspect of business.  

Customers are core. 

We strategize, operate, and execute through a customer-centric view. We prioritize the security interests of our customers, and we act as if their data were our own.  

Innovation never stops, it only accelerates. 

The speed of change is accelerating. We are committed, through investment and focus, to stay ahead of the innovation curve.  

We deliver with agility.  

We thrive in high-paced and continually changing environments. We navigate through newly added variables, adjust accordingly, while driving towards our strategic goals.  

United by respect.  

Respect for all is what unites us. We promote diversity, inclusivity, equity, and acting with empathy and openness, both in our business and in our communities.  

Teams make “it” happen. 

Vision and goals are not individually achievable – they require teamwork. We pride ourselves in operating as a cohesive team, creating promoters and partners, and winning as one.  

Keyfactor is a proud equal opportunity employer. 


REASONABLE ACCOMMODATION: Applicants with disabilities may contact a member of Keyfactor’s People team via [email protected] and/or telephone at 1.216.785.2990 to request and arrange for accommodations at any time. 

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