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The human element

We're a tech firm at heart, firmly focused on research and engineering. But even the most advanced technology has people at its core.

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And our ever-expanding team of engineers and developers are just that – real people with a real passion for innovation and teamwork, focused on a common goal.

Building a
fairer future

Digital trust is broken; we’re helping to fix it.

Innovation is a double-edged sword. As new technologies emerge, the bad actors – the fraudsters and scammers – are quick to adopt and adapt these technologies to their own criminal intentions.

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Callsign’s technical experts are leading the fight against fraud. We're building a better, safer digital future for everyone by developing technologies that help global business establish digital trust with their users and put identity at the heart of every digital interaction.

We speak
your language

Callsign is flexible, versatile, and vastly powerful. Our codebase allows our customers to operate our product in whichever way works for them – cloud-enabled, on-premises, or even in a hybrid mode.

Our talented team of developers call on their expertise in Java, Python and JavaScript to make that happen, as well as their knowledge of industry API standards – OUATH, SAML, and RESTful with JSON body.

But it's more
than just code

Whatever technical abilities you bring to the table, we’ll value your people skills just as much.

Whichever team or location you work in, you’ll find Callsign to be a welcoming, respectful and above all, engaging environment. From skills and career building opportunities to social events, we aim to encourage, nurture and develop every one of our people.

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Growing together

Be part of a global team, working together to develop game-changing products on the global stage.

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Develop your skills – grow your career

From lunch-and-learn sessions to training, we’ll give you the tools and skills to get where you want to be.

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A tech-first culture

Data led and evidence driven, our autonomous tech-first ethos is present in every element of our day-to-day work.

Your dream career
starts here

UK Software Engineer Apprentices with ADA

We’re proud to be partnered with ADA, the National College for Digital Skills, to support their mission to close the gap between education and industry and remove barriers between talent young people and their dream employers.

So what are you waiting for?

Let’s work together.