Castelion tech stack
Castelion builds mostly with Python, C++, MATLAB, Rust. Its stack also includes Linux, Azure, PostgreSQL, Pytest. Python is named in 34 of the 115 job postings Castelion published in the last 12 months (30%). Counted by Alion from the job postings of Castelion, updated Oct 22, 2026.
What programming languages does Castelion use?
Python is named in 30% of job postings at Castelion, followed by C++ (22%), MATLAB (15%), Rust (12%).
C++ 
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What frameworks and libraries does Castelion use?
Pytest is named in 2% of job postings at Castelion, followed by Asyncio (1%), CUDA (1%), FastAPI (1%).
What databases does Castelion use?
PostgreSQL is named in 2% of job postings at Castelion.
PostgreSQL
2 2%
What cloud and platforms does Castelion use?
Linux is named in 14% of job postings at Castelion, followed by Azure (4%), Power BI (4%), Kubernetes (3%).
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What developer tools does Castelion use?
SolidWorks is named in 14% of job postings at Castelion, followed by ANSYS (8%), Microsoft Excel (8%), Git (5%).
SolidWorks
16 14%
Git
6 5%
Foxglove Studio
3 3%
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What AI and ML technologies does Castelion use?
LLM is named in 1% of job postings at Castelion.
LLM
1 1%
Which engineering practices does Castelion ask for?
FMEA is named in 13% of job postings at Castelion, followed by AS9100 (11%), Statistical Process Control (10%), CI/CD (10%).
CI/CD
11 10%
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What does each Castelion team work with?
The technologies each team's postings require most often, with the number of postings that require them.
Industrial Engineering
38 postingsHardware
23 postingsAerospace
16 postingsBackend
5 postingsHow does your stack fit Castelion?
How modern is the Castelion stack?
Castelion scores 70 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: 1; legacy ones: 0.
How common is the Castelion stack in its industry?
Share of the 200 companies in the same industries, whose stack Alion knows, that use each technology.
Companies with a stack like Castelion
Questions about the Castelion tech stack
What programming languages does Castelion use?
The languages named in Castelion job postings are Python (30%), C++ (22%), MATLAB (15%), Rust (12%), SQL (9%), as a share of the 115 postings of the last 12 months.
Does Castelion use Pytest?
Yes. Pytest is named in 2 of 115 job postings (2%) and required in 1 of them.
What cloud and platforms does Castelion use?
The cloud and platforms named in Castelion job postings are Linux (16), Azure (5), Power BI (5) (postings in brackets).
What skills do you need for a Industrial Engineering job at Castelion?
Industrial Engineering postings at Castelion most often require SolidWorks (12), Python (5), ANSYS (4), C++ (3), out of 38 postings in the last 12 months.
Is the Castelion tech stack changing?
No new technology has appeared in Castelion job postings in the last six months.
How modern is the Castelion tech stack?
Castelion scores 70 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: 1; legacy ones: 0.
How does Alion know the Castelion tech stack?
Alion reads every job posting Castelion publishes and tags the technologies each one names. The figures on this page count the 115 postings of the last 12 months and were updated on Oct 22, 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, "Castelion tech stack: 110 technologies from 115 job postings", as of Oct 22, 2026. https://alion.io/company/castelion/technologies