Five9 tech stack
Five9 builds mostly with Python, SQL, JavaScript, Java. Its stack also includes GCP, Kubernetes, React.js, Google BigQuery. GCP is named in 61 of the 120 job postings Five9 published in the last 12 months (51%). Counted by Alion from the job postings of Five9, updated Nov 12, 2026.
What programming languages does Five9 use?
Python is named in 42% of job postings at Five9, followed by SQL (22%), JavaScript (17%), Java (14%).
Python
50 42%
SQL
26 22%
JavaScript
20 17%
Java
17 14%
Bash
16 13%
TypeScript
10 8%
Go
6 5%
PHP
3 3%
Show all (14)
What frameworks and libraries does Five9 use?
React.js is named in 11% of job postings at Five9, followed by Spring Boot (8%), Vue.js (6%), Angular (4%).
React.js
13 11%
Spring Boot
9 8%
Vue.js
7 6%
Angular
5 4%
Jest
4 3%
Playwright
4 3%
Spring Framework
4 3%
Zustand
4 3%
Show all (25)
What databases does Five9 use?
Google BigQuery is named in 9% of job postings at Five9, followed by Redis (6%), MySQL (3%), MS SQL (3%).
What cloud and platforms does Five9 use?
GCP is named in 51% of job postings at Five9, followed by Kubernetes (40%), AWS (34%), Linux (28%).
GCP
61 51%
Kubernetes
48 40%
AWS
41 34%
Azure
26 22%
GitLab
22 18%
Grafana
17 14%
GitLab CI
15 13%
Show all (48)
And 8 more, each named in fewer postings.
What developer tools does Five9 use?
Terraform is named in 33% of job postings at Five9, followed by Ansible (25%), Git (25%), Rest API (19%).
Terraform
40 33%
Ansible
30 25%
Git
30 25%
Rest API
23 19%
Helm
20 17%
OpenStack
16 13%
Prometheus
16 13%
Docker
15 13%
Show all (42)
And 2 more, each named in fewer postings.
What AI and ML technologies does Five9 use?
LLM is named in 13% of job postings at Five9, followed by Claude (10%), Gemini (3%), ChatGPT (2%).
Which engineering practices does Five9 ask for?
CI/CD is named in 55% of job postings at Five9, followed by GitOps (13%), MPLS (11%), BGP (10%).
CI/CD
66 55%
GitOps
16 13%
Incident Management
9 8%
Show all (50)
And 10 more, each named in fewer postings.
What does each Five9 team work with?
The technologies each team's postings require most often, with the number of postings that require them.
DevOps
32 postingsBackend
13 postingsNetworking
9 postingsAI/ML
8 postingsLeadership
7 postingsProduct
7 postingsHow does your stack fit Five9?
How much does Five9 pay by technology?
Median stated pay of the postings that name each technology, against the median of all Five9 postings with stated pay: $252k across 28 postings.
| Technology | Postings with pay | Median | vs company median |
|---|---|---|---|
| Python | 12 | $252k | 0% |
| Linux | 11 | $252k | 0% |
| GCP | 9 | $251k | 0% |
| Kubernetes | 8 | $252k | 0% |
| Bash | 7 | $252k | 0% |
| Ubuntu | 7 | $252k | 0% |
| AWS | 7 | $251k | 0% |
| LLM | 7 | $248k | −2% |
| Grafana | 6 | $252k | 0% |
| Claude | 6 | $230k | −9% |
How is the Five9 stack changing?
Read from the dates of the postings themselves: a technology is new when the first posting that names it appeared in the last six months, rising or falling when its share of postings moved between the last two quarters.
How modern is the Five9 stack?
Five9 scores 80 out of 100 (Cutting-edge). The score averages how current each technology in the stack is and adds weight for AI adoption. AI technologies in the stack: 7; legacy ones: 0.
How common is the Five9 stack in its industry?
Share of the 1,993 companies in the same industries, whose stack Alion knows, that use each technology.
What sets Five9 apart
Five9 products in its job postings
Postings at Five9 name its own products. They describe what the company makes, so they are left out of the stack above.
Companies with a stack like Five9
Questions about the Five9 tech stack
What programming languages does Five9 use?
The languages named in Five9 job postings are Python (42%), SQL (22%), JavaScript (17%), Java (14%), Bash (13%), as a share of the 120 postings of the last 12 months.
Does Five9 use React.js?
Yes. React.js is named in 13 of 120 job postings (11%) and required in 11 of them.
What cloud and platforms does Five9 use?
The cloud and platforms named in Five9 job postings are GCP (61), Kubernetes (48), AWS (41) (postings in brackets).
What skills do you need for a DevOps job at Five9?
DevOps postings at Five9 most often require Python (25), Terraform (25), Linux (23), Ansible (21), out of 32 postings in the last 12 months.
Is the Five9 tech stack changing?
Yes. Pytest, Robot Framework, Selenium, ChatGPT first appeared in Five9 job postings in the last six months.
How modern is the Five9 tech stack?
Five9 scores 80 out of 100 (Cutting-edge). The score averages how current each technology in the stack is and adds weight for AI adoption. AI technologies in the stack: 7; legacy ones: 0.
How does Alion know the Five9 tech stack?
Alion reads every job posting Five9 publishes and tags the technologies each one names. The figures on this page count the 120 postings of the last 12 months and were updated on Nov 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, "Five9 tech stack: 192 technologies from 120 job postings", as of Nov 12, 2026. https://alion.io/company/five9/technologies