Software engineer to specialize in crypto implementations

- Solna, Sweden

If you find math and crypto to be the coolest things ever, you may be just the nerd we are searching for.

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What we are looking for

PrimeKey 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. 


Tasks may include:

  • Analysis of specifications crypto & security that are relevant to our products

  • Taking part of implementation of crypto & security algorithms, protocols and related components

  • Working with support for PrimeKey’s Bouncy Castle 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)

Personal qualifications

We highly value the following personal qualifications and competencies:

  • 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


You are a M.Sc. or Ph.D. in computer science, mathematics, or a related discipline – but mind you; there are great cryptographers that started in Biology!


The ideal candidate should have:

  • 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++
  • Prior experience with implementation of cryptographic protocols
  • Familiarity with the UNIX command line and developer tools (e.g., git, svn)
  • 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


The position is based in Solna, Sweden. A valid working permit is a requirement.

The working language is English since you will interact with colleagues and customers around the globe. We hope you are not fussy about talking crypto in strange hours, occasionally taking oversees travels, since you will work in close cooperation with the team in Australia, as well as with other colleagues and customers in USA. 

What you want

We at PrimeKey are an open community of security geeks and we love meeting others who are eager to work with world-beating PKI security. If learning from leading security experts and lunch conversations about IoT security sound exciting to you, get in touch with us.

PrimeKey is one of the world’s leading companies for public key infrastructure (PKI) and digital signing solutions. As of June 2021, PrimeKey is a part of Keyfactor. 

Work in the forefront of security

For two decades, PrimeKey has been at the forefront of open source-based PKI (Public Key Infrastructure) and digital signing solutions. We work with some of the world’s most renowned organizations, but pride ourselves on bringing the same warmth and enthusiasm to any business, regardless of size.

With our products, we enable the creation and use of digital certificates and signatures, which are key elements for secure communication. We deliver the capability to implement enterprise grade PKI and signature systems ready to support solutions such as IoT, e-ID, ePassports, authentication, digital signatures, code signing, and validation; all solutions where digital certificates would be a main enabler. 

Join a friendly and creative company

Working at PrimeKey means excellent development opportunities, working with some of the best PKI specialists and developers in the world, joining a pleasant working environment, and interacting with highly skilled and engaged coworkers. 

Our core values are Excellence, Trust, and Openness, all aiming at always delivering high quality solutions to make the world of IT a secure place for sensitive information and communication. 

PrimeKey has offices in Stockholm, Sweden; San Mateo, USA; Aachen, Germany; Paris, France; and Melbourne, Australia. 

Does this sound interesting?

Please send your CV and cover letter with the job title as the subject.

Apply for this job

Please note: We are only looking for direct applicants and are not interested in being contacted by recruitment companies. 

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