Open tech stack
Open builds mostly with Java, JavaScript, TypeScript, C#. Its stack also includes Angular, .NET, Power BI, BigQuery. Java is named in 22 of the 49 job postings Open published in the last 12 months (45%). Counted by Alion from the job postings of Open, updated Oct 8, 2026.
What programming languages does Open use?
Java is named in 45% of job postings at Open, followed by JavaScript (35%), TypeScript (33%), C# (12%).
Show all (9)
What frameworks and libraries does Open use?
Angular is named in 33% of job postings at Open, followed by FastAPI (2%), Hadoop (2%), JUnit (2%).
Angular
16 33%
FastAPI
1 2%
Hadoop
1 2%
JUnit
1 2%
Jest
1 2%
Mockito
1 2%
Selenium
1 2%
Spring Boot
1 2%
Show all (9)
What databases does Open use?
BigQuery is named in 2% of job postings at Open, followed by Google BigQuery (2%), Oracle (2%), Snowflake (2%).
BigQuery 
What cloud and platforms does Open use?
.NET is named in 8% of job postings at Open, followed by Power BI (6%), Apache Kafka (4%), GCP (4%).
.NET
4 8%
Power BI
3 6%
Apache Kafka
2 4%
GCP
2 4%
Azure
2 4%
Azure DevOps
1 2%
Databricks
1 2%
GitLab
1 2%
Show all (11)
What developer tools does Open use?
Chef is named in 4% of job postings at Open, followed by Ansible (2%), Docker (2%), Docker Compose (2%).
Which engineering practices does Open ask for?
CI/CD is named in 10% of job postings at Open, followed by Machine Learning (2%), SOAP (2%).
What does each Open team work with?
The technologies each team's postings require most often, with the number of postings that require them.
Backend
33 postingsHow does your stack fit Open?
How modern is the Open stack?
Open scores 73 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 Open stack in its industry?
Share of the 2,051 companies in the same industries, whose stack Alion knows, that use each technology.
Companies with a stack like Open
Questions about the Open tech stack
What programming languages does Open use?
The languages named in Open job postings are Java (45%), JavaScript (35%), TypeScript (33%), C# (12%), Python (8%), as a share of the 49 postings of the last 12 months.
Does Open use Angular?
Yes. Angular is named in 16 of 49 job postings (33%) and required in 16 of them.
What cloud and platforms does Open use?
The cloud and platforms named in Open job postings are .NET (4), Power BI (3), Apache Kafka (2) (postings in brackets).
What skills do you need for a Backend job at Open?
Backend postings at Open most often require Java (20), Angular (15), .NET (4), C# (4), out of 33 postings in the last 12 months.
Is the Open tech stack changing?
No new technology has appeared in Open job postings in the last six months.
How modern is the Open tech stack?
Open scores 73 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 Open tech stack?
Alion reads every job posting Open publishes and tags the technologies each one names. The figures on this page count the 49 postings of the last 12 months and were updated on Oct 8, 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, "Open tech stack: 44 technologies from 49 job postings", as of Oct 8, 2026. https://alion.io/company/open-global/technologies