Leon tech stack
Leon builds mostly with Java, Kotlin, SQL, 1C. Its stack also includes PostgreSQL, Kubernetes, Redis, Apache Kafka. PostgreSQL is named in 14 of the 15 job postings Leon published in the last 12 months (93%). Counted by Alion from the job postings of Leon, updated Sep 28, 2026.
What programming languages does Leon use?
Java is named in 73% of job postings at Leon, followed by Kotlin (60%), SQL (13%), 1C (7%).
1C 
What frameworks and libraries does Leon use?
JUnit is named in 73% of job postings at Leon, followed by Mockito (60%), Spring Boot (60%), Spring Framework (60%).
JUnit
11 73%
Mockito
9 60%
Spring Boot
9 60%
Spring Framework
9 60%
Rest-Assured
2 13%
Selenium
2 13%
TestNG
2 13%
What databases does Leon use?
PostgreSQL is named in 93% of job postings at Leon, followed by Redis (87%), OpenSearch (27%), ClickHouse (13%).
What cloud and platforms does Leon use?
Kubernetes is named in 87% of job postings at Leon, followed by Apache Kafka (80%), Grafana (27%), LDAP (20%).
Kubernetes
13 87%
Apache Kafka
12 80%
Grafana
4 27%
Debian
2 13%
GitLab CI
2 13%
Show all (11)
What developer tools does Leon use?
Docker is named in 73% of job postings at Leon, followed by TestRail (20%), Jenkins (20%), Keycloak (20%).
Docker
11 73%
TestRail
3 20%
Jenkins
3 20%
Keycloak
3 20%
AWX
2 13%
Ansible
2 13%
Consul
2 13%
Git
2 13%
Show all (16)
Which engineering practices does Leon ask for?
CI/CD is named in 33% of job postings at Leon, followed by DNS (13%), GitOps (13%), IAM (13%).
What does each Leon team work with?
The technologies each team's postings require most often, with the number of postings that require them.
Backend
9 postingsQA
3 postingsHow does your stack fit Leon?
How modern is the Leon stack?
Leon scores 70 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 Leon stack in its industry?
Share of the 118 companies in the same industries, whose stack Alion knows, that use each technology.
What sets Leon apart
Companies with a stack like Leon
Questions about the Leon tech stack
What programming languages does Leon use?
The languages named in Leon job postings are Java (73%), Kotlin (60%), SQL (13%), 1C (7%), Python (7%), as a share of the 15 postings of the last 12 months.
Does Leon use JUnit?
Yes. JUnit is named in 11 of 15 job postings (73%) and required in 11 of them.
What cloud and platforms does Leon use?
The cloud and platforms named in Leon job postings are Kubernetes (13), Apache Kafka (12), Grafana (4) (postings in brackets).
What skills do you need for a Backend job at Leon?
Backend postings at Leon most often require Apache Kafka (9), Docker (9), JUnit (9), Java (9), out of 9 postings in the last 12 months.
Is the Leon tech stack changing?
No new technology has appeared in Leon job postings in the last six months.
How modern is the Leon tech stack?
Leon scores 70 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 Leon tech stack?
Alion reads every job posting Leon publishes and tags the technologies each one names. The figures on this page count the 15 postings of the last 12 months and were updated on Sep 28, 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, "Leon tech stack: 52 technologies from 15 job postings", as of Sep 28, 2026. https://alion.io/company/leon/technologies