School 21 tech stack
School 21 builds mostly with TypeScript, JavaScript. Its stack also includes Linux, Debian, React.js. Linux is named in 23 of the 24 job postings School 21 published in the last 12 months (96%). Counted by Alion from the job postings of School 21, updated Oct 12, 2026.
What programming languages does School 21 use?
TypeScript is named in 4% of job postings at School 21, followed by JavaScript (4%).
TypeScript
1 4%
JavaScript
1 4%
What frameworks and libraries does School 21 use?
React.js is named in 4% of job postings at School 21.
React.js
1 4%
What cloud and platforms does School 21 use?
Linux is named in 96% of job postings at School 21, followed by Debian (46%), Ubuntu (25%), VMWare (25%).
Debian
11 46%
Ubuntu
6 25%
VMWare
6 25%
GitLab CI
3 13%
Show all (12)
What developer tools does School 21 use?
Ansible is named in 88% of job postings at School 21, followed by AWX (75%), Proxmox VE (46%), Docker (33%).
Ansible
21 88%
AWX
18 75%
Proxmox VE
11 46%
Docker
8 33%
Hyper-V
6 25%
KVM
5 21%
Nginx
5 21%
Show all (15)
Which engineering practices does School 21 ask for?
DHCP is named in 21% of job postings at School 21, followed by VLAN (21%), CI/CD (13%), IAM (13%).
What does each School 21 team work with?
The technologies each team's postings require most often, with the number of postings that require them.
Support
8 postingsDevOps
6 postingsSecurity
3 postingsHow does your stack fit School 21?
How modern is the School 21 stack?
School 21 scores 66 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 School 21 stack in its industry?
Share of the 268 companies in the same industries, whose stack Alion knows, that use each technology.
What sets School 21 apart
Companies with a stack like School 21
Questions about the School 21 tech stack
What programming languages does School 21 use?
The languages named in School 21 job postings are TypeScript (4%), JavaScript (4%), as a share of the 24 postings of the last 12 months.
Does School 21 use Linux?
Yes. Linux is named in 23 of 24 job postings (96%) and required in 23 of them.
What cloud and platforms does School 21 use?
The cloud and platforms named in School 21 job postings are Linux (23), Debian (11), Ubuntu (6) (postings in brackets).
What skills do you need for a Support job at School 21?
Support postings at School 21 most often require Linux (8), Ansible (3), out of 8 postings in the last 12 months.
Is the School 21 tech stack changing?
No new technology has appeared in School 21 job postings in the last six months.
How modern is the School 21 tech stack?
School 21 scores 66 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 School 21 tech stack?
Alion reads every job posting School 21 publishes and tags the technologies each one names. The figures on this page count the 24 postings of the last 12 months and were updated on Oct 12, 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, "School 21 tech stack: 36 technologies from 24 job postings", as of Oct 12, 2026. https://alion.io/company/21school/technologies