Research Scientist


London, GB
  • Job Type: Full-Time
  • Function: Research Sci/Assoc/Mgr
  • Post Date: 04/23/2021
  • Website:
  • Company Address:

About Callsign

Callsign is the app that makes identification quick, secure and private. No more passwords, forms and even business cards. Use your single Callsign across multiple channels and applications, at work and at home.

Job Description

Since our launch in 2012, we’ve been on a mission: to make digital identification simple and secure for everyone, and everything.

In that time, we’ve expanded constantly, and been joined by over 150 incredible people, all with the same vision. We’ve grown in other ways too – we raised $35m in our Series A funding round, and launched our game-changing authentication platform.

Our technology is now being used by hundreds and thousands of users worldwide, including some of the world’s leading financial institutions.

And this is just the beginning.

Over the next year, Callsign will double in size as we continue our mission to make every web, mobile and physical interaction seamless and secure.

We can’t do that alone, though. That’s why we’re looking to hire the brightest, most inquisitive minds out there: the people who want to help us change the rules of identity ­– and have the skills and passion to make this mission a reality.

Does that sound like you? Let’s talk.


We are looking for a Research Scientist who will help build, grow and promote the machine learning capabilities of Callsign's AI-driven identity and authentication solutions. The role will principally involve developing and improving machine learning models which analyse behavioural, biometric, and threat-related data. The role is centred around the research skill set--the ability to devise, implement and evaluate new machine learning models is a strong requirement. Because the role involves the entire research and development cycle from idea to production-ready code we require some experience around good software development practices, including unit testing. Finally, because the role also entails writing technical documentation and whitepapers, strong writing skills are essential.




* Designing and evaluating machine learning models for analysing behavioural, biometric, and threat-related data

* Implementing production-ready code based on own research

* Raising awareness around machine learning innovations by creating whitepapers and submitting patents

Skills and Qualifications

* Essential: Completed PhD/MSc in or involving Machine Learning, Applied Statistics, or Physics

* Essential: Knowledge of fundamental machine learning techniques and concepts in statistics

* Desirable: Experience with techniques from deep learning, signal processing, time series analysis, linear algebra, probability theory (especially Bayesian statistics), or information theory, as evidenced by own research publications

* Essential: Python and Numpy

* Desirable: Interest in cyber-security or biometrics

Please note: successful candidates are subject to a background check for this role.


Automatic Option:

  • Health Insurance – single
  • Life Insurance
  • Employee Assistance Program
  • 3 months full pay maternity & 2 weeks full pay paternity (if the statutory minimum is meet)
  • 25 days of annual leave + Callsign Bank Holiday (not included in holiday allowance)
  • Free Financial Advise


  • Cycle to work scheme
  • Wills and Estates – our benefits provider has partnered with a third party who offers a discount
  • Home Utilities our benefits provider has partnered with a third party who offers a discount
  • Cycle Insurance
  • Health cash plans
  • Cyclist protection
  • Discounted gym membership

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Disclaimer: Local Candidates Only
This company does NOT accept candidates from outside recruiting firms. Agency contacts are not welcome.