Phase1 tech stack
Phase1 builds mostly with Java, C#, JavaScript, SQL. Its stack also includes Windows, .NET, MySQL, Oracle. Java is named in 7 of the 7 job postings Phase1 published in the last 12 months (100%). Counted by Alion from the job postings of Phase1, updated Sep 28, 2026.
What programming languages does Phase1 use?
Java is named in 100% of job postings at Phase1, followed by C# (57%), JavaScript (43%), SQL (43%).
C# 
What frameworks and libraries does Phase1 use?
Spring Boot is named in 14% of job postings at Phase1.
Spring Boot
1 14%
What databases does Phase1 use?
MySQL is named in 43% of job postings at Phase1, followed by Oracle (43%), Db2 (29%), PostgreSQL (29%).
What cloud and platforms does Phase1 use?
Windows is named in 71% of job postings at Phase1, followed by .NET (57%), AWS (43%), Linux (43%).
.NET
4 57%
AWS
3 43%
Azure
2 29%
OpenShift
2 29%
VMWare
2 29%
Show all (18)
What developer tools does Phase1 use?
Apache Tomcat is named in 71% of job postings at Phase1, followed by Apache HTTP Server (57%), Zabbix (29%), CloudFormation (14%).
Apache Tomcat
5 71%
Zabbix
2 29%
CloudFormation
1 14%
Docker
1 14%
Hyper-V
1 14%
Jenkins
1 14%
Terraform
1 14%
What AI and ML technologies does Phase1 use?
LLM is named in 14% of job postings at Phase1.
LLM
1 14%
Which engineering practices does Phase1 ask for?
CI/CD is named in 14% of job postings at Phase1, followed by DNS (14%), IAM (14%), FinOps (14%).
How does your stack fit Phase1?
How is the Phase1 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 Phase1 stack?
Phase1 scores 77 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: 1; legacy ones: 0.
Companies with a stack like Phase1
Questions about the Phase1 tech stack
What programming languages does Phase1 use?
The languages named in Phase1 job postings are Java (100%), C# (57%), JavaScript (43%), SQL (43%), C++ (14%), as a share of the 7 postings of the last 12 months.
Does Phase1 use Windows?
Yes. Windows is named in 5 of 7 job postings (71%) and required in 5 of them.
What cloud and platforms does Phase1 use?
The cloud and platforms named in Phase1 job postings are Windows (5), .NET (4), AWS (3) (postings in brackets).
Is the Phase1 tech stack changing?
No new technology has appeared in Phase1 job postings in the last six months.
How modern is the Phase1 tech stack?
Phase1 scores 77 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: 1; legacy ones: 0.
How does Alion know the Phase1 tech stack?
Alion reads every job posting Phase1 publishes and tags the technologies each one names. The figures on this page count the 7 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, "Phase1 tech stack: 43 technologies from 7 job postings", as of Sep 28, 2026. https://alion.io/company/phase1/technologies