Citadel tech stack
Citadel builds mostly with Python, C++, SQL, Java. Its stack also includes AWS, Azure. Python is named in 11 of the 12 job postings Citadel published in the last 12 months (92%). Counted by Alion from the job postings of Citadel, updated Oct 24, 2026.
What programming languages does Citadel use?
Python is named in 92% of job postings at Citadel, followed by C++ (67%), SQL (17%), Java (8%).
What cloud and platforms does Citadel use?
AWS is named in 8% of job postings at Citadel, followed by Azure (8%), GCP (8%).
Which engineering practices does Citadel ask for?
Machine Learning is named in 67% of job postings at Citadel, followed by Time Series (17%), CI/CD (8%), Knowledge Graph (8%).
Time Series 
What does each Citadel team work with?
The technologies each team's postings require most often, with the number of postings that require them.
Data Science
6 postingsBackend
3 postingsAI/ML
3 postingsHow does your stack fit Citadel?
How modern is the Citadel stack?
Citadel scores 72 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 Citadel stack in its industry?
Share of the 158 companies in the same industries, whose stack Alion knows, that use each technology.
Companies with a stack like Citadel
Questions about the Citadel tech stack
What programming languages does Citadel use?
The languages named in Citadel job postings are Python (92%), C++ (67%), SQL (17%), Java (8%), Julia (8%), as a share of the 12 postings of the last 12 months.
What cloud and platforms does Citadel use?
The cloud and platforms named in Citadel job postings are AWS (1), Azure (1), GCP (1) (postings in brackets).
What skills do you need for a Data Science job at Citadel?
Data Science postings at Citadel most often require Python (6), C++ (3), SQL (2), out of 6 postings in the last 12 months.
Is the Citadel tech stack changing?
No new technology has appeared in Citadel job postings in the last six months.
How modern is the Citadel tech stack?
Citadel scores 72 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 Citadel tech stack?
Alion reads every job posting Citadel publishes and tags the technologies each one names. The figures on this page count the 12 postings of the last 12 months and were updated on Oct 24, 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, "Citadel tech stack: 13 technologies from 12 job postings", as of Oct 24, 2026. https://alion.io/company/citadel-4/technologies