Fello tech stack
Fello builds mostly with SQL. Its stack also includes Anthropic, OpenAI, PostgreSQL. LLM is named in 4 of the 8 job postings Fello published in the last 12 months (50%). Counted by Alion from the job postings of Fello, updated Oct 19, 2026.
What databases does Fello use?
PostgreSQL is named in 13% of job postings at Fello.
PostgreSQL
1 13%
What cloud and platforms does Fello use?
Anthropic is named in 25% of job postings at Fello, followed by OpenAI (25%), AWS (13%), Amazon S3 (13%).
What developer tools does Fello use?
Model Context Protocol is named in 13% of job postings at Fello.
Model Context Protocol
1 13%
What AI and ML technologies does Fello use?
LLM is named in 50% of job postings at Fello, followed by ChatGPT (13%).
Which engineering practices does Fello ask for?
AI Agents is named in 100% of job postings at Fello, followed by Function Calling (38%), Structured Outputs (38%), Human-in-the-Loop (25%).
AI Agents
8 100%
Function Calling
3 38%
Embeddings
1 13%
Hallucination
1 13%
Show all (13)
How does your stack fit Fello?
How is the Fello 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 Fello stack?
Fello scores 84 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 Fello stack in its industry?
Share of the 365 companies in the same industries, whose stack Alion knows, that use each technology.
Companies with a stack like Fello
Questions about the Fello tech stack
What programming languages does Fello use?
The languages named in Fello job postings are SQL (13%), as a share of the 8 postings of the last 12 months.
Does Fello use Anthropic?
Yes. Anthropic is named in 2 of 8 job postings (25%) and required in 1 of them.
What cloud and platforms does Fello use?
The cloud and platforms named in Fello job postings are Anthropic (2), OpenAI (2), AWS (1) (postings in brackets).
Is the Fello tech stack changing?
Yes. Human-in-the-Loop first appeared in Fello job postings in the last six months.
How modern is the Fello tech stack?
Fello scores 84 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 Fello tech stack?
Alion reads every job posting Fello publishes and tags the technologies each one names. The figures on this page count the 8 postings of the last 12 months and were updated on Oct 19, 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, "Fello tech stack: 24 technologies from 8 job postings", as of Oct 19, 2026. https://alion.io/company/fello/technologies