Five9 tech stack
Five9 builds mostly with Python, SQL, Java, JavaScript. Its stack also includes GCP, Kubernetes, React.js, BigQuery. GCP is named in 52 of the 103 job postings Five9 published in the last 12 months (50%). Counted by Alion from the job postings of Five9, updated Sep 28, 2026.
What programming languages does Five9 use?
Python is named in 36% of job postings at Five9, followed by SQL (20%), Java (16%), JavaScript (16%).
Python
37 36%
SQL
21 20%
Java
16 16%
JavaScript
16 16%
Bash
12 12%
TypeScript
10 10%
Go
4 4%
C#
3 3%
Show all (15)
What frameworks and libraries does Five9 use?
React.js is named in 12% of job postings at Five9, followed by Spring Boot (8%), Vue.js (6%), Angular (5%).
React.js
12 12%
Spring Boot
8 8%
Vue.js
6 6%
Angular
5 5%
Jest
4 4%
Playwright
4 4%
Spring Framework
4 4%
Zustand
4 4%
Show all (23)
What databases does Five9 use?
BigQuery is named in 10% of job postings at Five9, followed by Google BigQuery (10%), Redis (6%), MS SQL (3%).
BigQuery
10 10%
Google BigQuery
10 10%
Redis
6 6%
MS SQL
3 3%
CockroachDB
2 2%
Snowflake
2 2%
MySQL
2 2%
What cloud and platforms does Five9 use?
GCP is named in 50% of job postings at Five9, followed by Kubernetes (38%), AWS (34%), Linux (26%).
GCP
52 50%
Kubernetes
39 38%
AWS
35 34%
Azure
22 21%
GitLab
21 20%
Grafana
13 13%
GitLab CI
12 12%
Show all (48)
And 8 more, each named in fewer postings.
What developer tools does Five9 use?
Terraform is named in 32% of job postings at Five9, followed by Ansible (22%), Git (21%), Rest API (16%).
Terraform
33 32%
Ansible
23 22%
Git
22 21%
Rest API
16 16%
Helm
14 14%
Prometheus
13 13%
Docker
12 12%
Loki
10 10%
Show all (41)
And 1 more, each named in fewer postings.
What AI and ML technologies does Five9 use?
LLM is named in 15% of job postings at Five9, followed by Claude (10%), Gemini (2%), ChatGPT (1%).
Which engineering practices does Five9 ask for?
CI/CD is named in 54% of job postings at Five9, followed by GitOps (12%), IAM (10%), BGP (9%).
CI/CD
56 54%
GitOps
12 12%
Incident Management
7 7%
Show all (52)
And 12 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
28 postingsBackend
11 postingsAI/ML
8 postingsLeadership
7 postingsFrontend
5 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: $248k across 23 postings.
| Technology | Postings with pay | Median | vs company median |
|---|---|---|---|
| Python | 8 | $250k | +1% |
| Linux | 8 | $231k | −7% |
| GCP | 7 | $252k | +2% |
| AWS | 6 | $242k | −3% |
| LLM | 6 | $239k | −4% |
| Kubernetes | 5 | $252k | +2% |
| Grafana | 5 | $252k | +2% |
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 919 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 (36%), SQL (20%), Java (16%), JavaScript (16%), Bash (12%), as a share of the 103 postings of the last 12 months.
Does Five9 use React.js?
Yes. React.js is named in 12 of 103 job postings (12%) and required in 10 of them.
What cloud and platforms does Five9 use?
The cloud and platforms named in Five9 job postings are GCP (52), Kubernetes (39), AWS (35) (postings in brackets).
What skills do you need for a DevOps job at Five9?
DevOps postings at Five9 most often require Terraform (24), Linux (22), Python (21), Ansible (20), out of 28 postings in the last 12 months.
Is the Five9 tech stack changing?
Yes. Redux, Databricks, JUnit, MySQL 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 103 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, "Five9 tech stack: 193 technologies from 103 job postings", as of Sep 28, 2026. https://alion.io/company/five9/technologies