ONI tech stack
ONI builds mostly with C++, Python, Embedded C, C. C++ is named in 2 of the 3 job postings ONI published in the last 12 months (67%). Counted by Alion from the job postings of ONI, updated Oct 27, 2026.
What programming languages does ONI use?
C++ is named in 67% of job postings at ONI, followed by Python (67%), Embedded C (33%), C (33%).
C++ 
Which engineering practices does ONI ask for?
CI/CD is named in 33% of job postings at ONI, followed by Immunohistochemistry (33%), Machine Learning (33%).
How does your stack fit ONI?
How is the ONI 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 ONI stack?
ONI 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: 0; legacy ones: 0.
How common is the ONI stack in its industry?
Share of the 383 companies in the same industries, whose stack Alion knows, that use each technology.
Companies with a stack like ONI
Questions about the ONI tech stack
What programming languages does ONI use?
The languages named in ONI job postings are C++ (67%), Python (67%), Embedded C (33%), C (33%), as a share of the 3 postings of the last 12 months.
Is the ONI tech stack changing?
Yes. C++, Python first appeared in ONI job postings in the last six months.
How modern is the ONI tech stack?
ONI 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: 0; legacy ones: 0.
How does Alion know the ONI tech stack?
Alion reads every job posting ONI publishes and tags the technologies each one names. The figures on this page count the 3 postings of the last 12 months and were updated on Oct 27, 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, "ONI tech stack: 8 technologies from 3 job postings", as of Oct 27, 2026. https://alion.io/company/oni-3/technologies