Callsign tech stack
Callsign builds mostly with Java, SQL, JavaScript, Kotlin. Its stack also includes AWS, Apache Kafka, MySQL, Spring Boot. Java is named in 3 of the 5 job postings Callsign published in the last 12 months (60%). Counted by Alion from the job postings of Callsign, updated Oct 3, 2026.
What programming languages does Callsign use?
Java is named in 60% of job postings at Callsign, followed by SQL (40%), JavaScript (20%), Kotlin (20%).
What frameworks and libraries does Callsign use?
Spring Boot is named in 60% of job postings at Callsign, followed by OpenTelemetry (40%), Spring Security (20%), Angular (20%).
Spring Boot
3 60%
OpenTelemetry
2 40%
Spring Security
1 20%
Angular
1 20%
Cypress
1 20%
JUnit
1 20%
Jest
1 20%
Mockito
1 20%
Show all (15)
What databases does Callsign use?
MySQL is named in 60% of job postings at Callsign, followed by DynamoDB (40%), PostgreSQL (40%), Redis (40%).
What cloud and platforms does Callsign use?
AWS is named in 60% of job postings at Callsign, followed by Apache Kafka (60%), Kubernetes (60%), Linux (40%).
AWS
3 60%
Apache Kafka
3 60%
Kubernetes
3 60%
Grafana
2 40%
Figma
1 20%
GCP
1 20%
RabbitMQ
1 20%
What developer tools does Callsign use?
Docker is named in 60% of job postings at Callsign, followed by Helm (40%), Prometheus (40%), Terraform (40%).
Docker
3 60%
Helm
2 40%
Prometheus
2 40%
Terraform
2 40%
gRPC
1 20%
Storybook
1 20%
Vite
1 20%
Webpack
1 20%
Show all (9)
Which engineering practices does Callsign ask for?
CI/CD is named in 100% of job postings at Callsign, followed by Reactive Programming (20%), State Management (20%).
What does each Callsign team work with?
The technologies each team's postings require most often, with the number of postings that require them.
Backend
4 postingsHow does your stack fit Callsign?
How modern is the Callsign stack?
Callsign scores 73 out of 100 (Modern). The score averages how current each technology in the stack is and adds weight for AI adoption. AI technologies in the stack: 0; legacy ones: 0.
How common is the Callsign stack in its industry?
Share of the 273 companies in the same industries, whose stack Alion knows, that use each technology.
Companies with a stack like Callsign
Rakuten
34 shared technologies
Beyond Sports
31 shared technologies
Sirisoft
32 shared technologies
EvoAI
32 shared technologies
ilia.com domain name may be for sale
33 shared technologies
Imagine Learning
31 shared technologies
Intellectsoft
32 shared technologies
FPT Software
35 shared technologies
Questions about the Callsign tech stack
What programming languages does Callsign use?
The languages named in Callsign job postings are Java (60%), SQL (40%), JavaScript (20%), Kotlin (20%), Sass (20%), as a share of the 5 postings of the last 12 months.
Does Callsign use Spring Boot?
Yes. Spring Boot is named in 3 of 5 job postings (60%) and required in 3 of them.
What cloud and platforms does Callsign use?
The cloud and platforms named in Callsign job postings are AWS (3), Apache Kafka (3), Kubernetes (3) (postings in brackets).
What skills do you need for a Backend job at Callsign?
Backend postings at Callsign most often require Spring Boot (3), Docker (2), Java (2), MySQL (2), out of 4 postings in the last 12 months.
Is the Callsign tech stack changing?
No new technology has appeared in Callsign job postings in the last six months.
How modern is the Callsign tech stack?
Callsign scores 73 out of 100 (Modern). The score averages how current each technology in the stack is and adds weight for AI adoption. AI technologies in the stack: 0; legacy ones: 0.
How does Alion know the Callsign tech stack?
Alion reads every job posting Callsign publishes and tags the technologies each one names. The figures on this page count the 5 postings of the last 12 months and were updated on Oct 3, 2026.
Method and citation
Alion reads every job posting the company publishes and tags the technologies each one names. Shares count the postings of the last 12 months, open and closed; the company's own products are counted apart. How we count
Alion, "Callsign tech stack: 45 technologies from 5 job postings", as of Oct 3, 2026. https://alion.io/company/callsign/technologies