Fiddler tech stack
Fiddler builds mostly with Python. Its stack also includes Apache Kafka, MLFlow, PyTorch, BigQuery. AWS is named in 3 of the 6 job postings Fiddler published in the last 12 months (50%). Counted by Alion from the job postings of Fiddler, updated Oct 17, 2026.
What programming languages does Fiddler use?
Python is named in 33% of job postings at Fiddler.
Python
2 33%
What frameworks and libraries does Fiddler use?
PyTorch is named in 50% of job postings at Fiddler, followed by Accelerate (33%), Hadoop (33%), Scikit-learn (33%).
PyTorch
3 50%
Accelerate
2 33%
Hadoop
2 33%
Scikit-learn
2 33%
TensorFlow
2 33%
LangChain
1 17%
LangGraph
1 17%
Show all (11)
What databases does Fiddler use?
BigQuery is named in 33% of job postings at Fiddler, followed by Google BigQuery (33%), Snowflake (33%), PostgreSQL (17%).
BigQuery 
What cloud and platforms does Fiddler use?
Apache Kafka is named in 50% of job postings at Fiddler, followed by MLFlow (50%), AWS (50%), GCP (50%).
Apache Kafka
3 50%
MLFlow
3 50%
AWS
3 50%
GCP
3 50%
Kubernetes
3 50%
Azure
2 33%
Show all (15)
What developer tools does Fiddler use?
Rest API is named in 33% of job postings at Fiddler.
Rest API
2 33%
What AI and ML technologies does Fiddler use?
LLM is named in 50% of job postings at Fiddler, followed by BERT (17%).
Which engineering practices does Fiddler ask for?
Machine Learning is named in 67% of job postings at Fiddler, followed by AI Agents (50%), Hallucination (33%), Interpretability (33%).
AI Agents
3 50%
Hallucination
2 33%
RAG
2 33%
CI/CD
1 17%
Fine-tuning
1 17%
Show all (15)
How does your stack fit Fiddler?
How modern is the Fiddler stack?
Fiddler scores 81 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: 2; legacy ones: 0.
How common is the Fiddler stack in its industry?
Share of the 50 companies in the same industries, whose stack Alion knows, that use each technology.
What sets Fiddler apart
Companies with a stack like Fiddler
Questions about the Fiddler tech stack
What programming languages does Fiddler use?
The languages named in Fiddler job postings are Python (33%), as a share of the 6 postings of the last 12 months.
Does Fiddler use PyTorch?
Yes. PyTorch is named in 3 of 6 job postings (50%) and required in 3 of them.
What cloud and platforms does Fiddler use?
The cloud and platforms named in Fiddler job postings are Apache Kafka (3), MLFlow (3), AWS (3) (postings in brackets).
Is the Fiddler tech stack changing?
No new technology has appeared in Fiddler job postings in the last six months.
How modern is the Fiddler tech stack?
Fiddler scores 81 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: 2; legacy ones: 0.
How does Alion know the Fiddler tech stack?
Alion reads every job posting Fiddler publishes and tags the technologies each one names. The figures on this page count the 6 postings of the last 12 months and were updated on Oct 17, 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, "Fiddler tech stack: 51 technologies from 6 job postings", as of Oct 17, 2026. https://alion.io/company/fiddler/technologies