Callsign
callsign.com
Actively hiring
Identity Management
Fraud Detection
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Salaries
Products
People
Growth
Offices
Jobs
Financials
Overview
Callsign is a London company founded in 2012 that authenticates users through behavioural biometrics and device intelligence. Its models recognise how a person types, swipes and holds a phone to spot impersonation without adding friction. The company works with banks and telecom operators fighting authorised push payment fraud.
News
2 American Airlines Boeing 737s With The Same Callsign Flew Straight At Each Other
Delayed inbound AA2482 and on time departure with the same callsign created cockpit and ATC audio confusion over Phoenix.
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Aviator Call Signs: The History & Naming Rituals
The call sign tradition is celebrated by aviation communities across all military branches and naming rituals for fighter, bomber and other pilots have become a pretty formal process. But those rituals developed slowly over time and their origins are a bi
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'Especially meaningful': Hawaiian Airlines makes final flight with 'HA' callsign
The last flight with Hawaiian's callsign, HA866, from Pago Pago, American Samoa, arrived at the Honolulu International Airport on Wednesday morning.
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Tech stack
Technologies named in job postings at Callsign over the last 12 months, by layer, with the share of postings for each.
Technologies in use
49
Postings analysed
9
Stack modernity
72/100
Languages
Java
JavaScript
TypeScript
SQL
Frameworks & libraries
Spring Boot
React.js
OpenTelemetry
Angular
Databases
MySQL
DynamoDB
PostgreSQL
Redis
Cloud & platforms
AWS
Apache Kafka
Kubernetes
Linux
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Full Callsign tech stack
49 technologies · by team · pay by technology · changes · similar stacks
Growth
Hiring Momentum
97/100
Scaling fast
Open positions
8
10 opened / 2 closed in 30 days
Median time-to-fill
6 days
faster than 78% of the market
ATS activity
Every ~4 hours
Today
Hiring Dynamics
+100%
Hiring Focus
The percentage next to each role is its share of the company's job openings over the last 90 days; the arrow shows the shift versus the previous period.
Backend
60% ▲
Industrial Engineering
20% ▲
Product
10% ▲
Support
10% ▲
Actively hiring for Backend (+6 in 30 days)
Activity Timeline
New location: Manchester
Oct 2026
Added Service Desk to stack
Oct 2026
Added Jira to stack
Oct 2026
Added Incident Management to stack
Oct 2026
+3 jobs in a week
Oct 2026
New location: London
Oct 2026
Added GitLab to stack
Oct 2026
Added GitOps to stack
Oct 2026
Added GitLab CI to stack
Oct 2026
Offices
Where the company hires and what each office is for
Cities
3
Hiring now
3
Countries
2
Busiest office
London
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Headquarters
Builds here
Office with open vacancies
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London
United Kingdom
HQ
3 open roles 3 posted in 90 days 33% engineering 50-200 est. staff
hires for Industrial Engineering, Backend
Abu Dhabi
United Arab Emirates
Engineering / R&D
4 open roles 6 posted in 90 days 75% engineering 200-500 est. staff
hires for Backend, Product
Manchester
United Kingdom
1 open roles 1 posted in 90 days 10-50 est. staff
hires for Support
Jobs
≈ $34k – $64k per year (Estimated) • In office • Full-Time • Manchester
Incident Management
Management
Jira
ITIL
Service Desk
Apply
≈ $71k – $171k per year (Estimated) • In office • Full-Time • London
JavaScript
Java
Kotlin
TypeScript
SQL
Spring Boot
Kotlin
Mockito
Databases
MySQL
PostgreSQL
Redis
DynamoDB
Apache Kafka
Frontend
Vue.js
Zustand
Redux
Webpack
Angular
React.js
Vite
Storybook
npm
Sass
Redux Toolkit
Mobile
JUnit
State Management
DevOps
gRPC
GCP
Helm
OpenTelemetry
Prometheus
CI/CD
AWS
Docker
Kubernetes
Grafana
Linux
Cybersecurity
OWASP Top 10
Design
Figma
Management
Agile
QA
Cypress
Jest
Apply
In office • Full-Time • Bachelor's Degree • Abu Dhabi
Java
SQL
Spring Boot
Databases
MySQL
PostgreSQL
Redis
DynamoDB
RabbitMQ
Apache Kafka
Mobile
Reactive Programming
DevOps
Terraform
OpenTelemetry
Prometheus
CI/CD
AWS
Docker
Kubernetes
Grafana
Linux
Management
Agile
Apply
In office • Full-Time • Bachelor's Degree • Abu Dhabi
JavaScript
Java
Kotlin
TypeScript
SQL
Spring Boot
Kotlin
Mockito
Databases
MySQL
PostgreSQL
Redis
DynamoDB
Apache Kafka
Frontend
Vue.js
Zustand
Redux
Webpack
Angular
React.js
Vite
Storybook
npm
Sass
Redux Toolkit
Mobile
JUnit
State Management
DevOps
gRPC
GCP
Helm
OpenTelemetry
Prometheus
CI/CD
AWS
Docker
Kubernetes
Grafana
Linux
Cybersecurity
OWASP Top 10
Design
Figma
Management
Agile
QA
Cypress
Jest
Apply
≈ $42k – $125k per year (Estimated) • In office • Full-Time • Bachelor's Degree • Abu Dhabi
Java
RxJava
Spring Boot
Spring Security
Vert.x
Databases
MySQL
Apache Kafka
DevOps
Terraform
Helm
CI/CD
AWS
Docker
Kubernetes
Cybersecurity
OWASP Top 10
Apply
≈ $45k – $125k per year (Estimated) • In office • Full-Time • Bachelor's Degree • Abu Dhabi
CI/CD
Management
Agile
Scrum
ITIL
Apply
Financials
Total raised
$35M
Latest round
Venture - Series Unknown
Funding rounds
1
Funding rounds
| Round | Announced | Amount | |
|---|---|---|---|
| Venture - Series Unknown | 2017 | $35M | Details |