We want to seamlessly power the identification of every web, mobile interaction. To do this we hire the most inquisitive minds who want to change the rules of identity and make this mission a reality.

Founded 2011
51-200 employees
  • Cybersecurity
  • Banking, Corporate Finance, & Investing
  • Digital Payments
  • Headquarters address
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    At Callsign we are changing identity. We are an identity fraud, authorisation & authentication company, solving the challenges that organisations face in getting their users on to & interacting with their digital platforms.

    We use deep learning techniques to combine device, location and behaviour datapoints with dynamic policy management and multi-factor authentication, to verify that the user is who they say they are.

    Our aim is to make identification more secure and simple – helping everyone to get on with their digital lives in the most seamless and secure way possible. If you’re interested in working for a company that’s changing the face of digital security globally, then you’re in the right place. We’re a talented team of research scientists, engineers and developers working with the latest technology to help make the digital world a more secure place.

    Our Culture

    Callsign is a talented team of people who are passionate about their craft and who care about making the digital world more secure. We work collaboratively, adopting agile principles and methodology and use the latest technologies to develop a reactive and scalable platform.

    With boardgames nights, pop-up social activities and company parties, it’s easy to meet new colleagues and feel part of the team and, with breakout spaces throughout the office it’s easy to find space to socialise. But we also know how important it is to have time away from regular meetings, so we’ve allotted core development time at the end of the week.

    Our Values

    From challenging the status quo and driving an identity revolution, to building a world that protects user identities, we always set the bar high.

    To deliver what we say we will, we’ve got to be the best at what we do, while
    making sure there’s an artistry to our expertise.

    We’re determined to defend our customers against the bad guys, making identification safe and easy for everyone.


    This is the reason we do what we do to protect identities without ever betraying trust.


    Building a community at work, a community of partners and customers, and supporting the wider community outside of Callsign, really, really matters to us.

    Tech stack

    Java, Spring Boot, Javascript, Python, Docker, Kubernetes, Scala, Kafka, Cassandra, PostgreSQL, DynamoDB


    Compensation and retirement

    Stock Options
    Pension plan

    Health and wellness

    Insurance (Health)
    Insurance (Dental)
    Insurance (Vision)
    Insurance (Life)
    EAP (Employee Assistance Program)
    Fitness reimbursement

    Vacation and time off

    Paid time off
    Paid holidays
    Flexible working hours
    Work from home flexibility
    Volunteer time off
    Maternity benefits
    Paternity benefits

    Personal development

    Management training
    Job training
    Conferences reimbursement
    Internship program

    Values and quality of life

    Diversity program
    Accessible via public transportation
    Bike parking
    Employee groups and committees
    Snacks and beverages
    Catered meals
    Matching charitable donations
    Company activities
    Games and recreation
    Employee discount programs
    Callsign - Company Photo
    Callsign - Company Photo
    Callsign - Company Photo
    Callsign - Company Photo
    Callsign - Company Photo
    Callsign - Company Photo