Fellow tech stack
Fellow builds mostly with Node JS, Python, JavaScript, C++. Its stack also includes AWS, RTOS, PostgreSQL, Nest.JS. AWS is named in 5 of the 8 job postings Fellow published in the last 12 months (63%). Counted by Alion from the job postings of Fellow, updated Oct 6, 2026.
What programming languages does Fellow use?
Node JS is named in 50% of job postings at Fellow, followed by Python (50%), JavaScript (50%), C++ (38%).
What frameworks and libraries does Fellow use?
Nest.JS is named in 38% of job postings at Fellow, followed by React.js (25%), Express (13%), Next.js (13%).
What databases does Fellow use?
PostgreSQL is named in 38% of job postings at Fellow, followed by BigQuery (13%), Google BigQuery (13%).
BigQuery 
What cloud and platforms does Fellow use?
AWS is named in 63% of job postings at Fellow, followed by RTOS (38%), API Gateway (38%), AWS Lambda (38%).
AWS
5 63%
RTOS
3 38%
AWS Lambda
3 38%
Figma
1 13%
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What developer tools does Fellow use?
Rest API is named in 50% of job postings at Fellow, followed by Git (25%), MQTT (25%), WebSockets (25%).
Rest API
4 50%
Git
2 25%
MQTT
2 25%
WebSockets
2 25%
CloudFormation
1 13%
Docker
1 13%
GraphQL
1 13%
Jenkins
1 13%
Show all (10)
Which engineering practices does Fellow ask for?
CI/CD is named in 50% of job postings at Fellow, followed by IAM (38%), PKI (38%), FinOps (38%).
CI/CD
4 50%
FinOps
3 38%
AI Agents
1 13%
Show all (10)
How does your stack fit Fellow?
How is the Fellow 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 Fellow stack?
Fellow scores 74 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 Fellow stack in its industry?
Share of the 55 companies in the same industries, whose stack Alion knows, that use each technology.
What sets Fellow apart
Companies with a stack like Fellow
Questions about the Fellow tech stack
What programming languages does Fellow use?
The languages named in Fellow job postings are Node JS (50%), Python (50%), JavaScript (50%), C++ (38%), TypeScript (38%), as a share of the 8 postings of the last 12 months.
Does Fellow use Nest.JS?
Yes. Nest.JS is named in 3 of 8 job postings (38%) and required in 1 of them.
What cloud and platforms does Fellow use?
The cloud and platforms named in Fellow job postings are AWS (5), RTOS (3), API Gateway (3) (postings in brackets).
Is the Fellow tech stack changing?
Yes. WebSockets, Wi-Fi, Python, Rest API first appeared in Fellow job postings in the last six months.
How modern is the Fellow tech stack?
Fellow scores 74 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 Fellow tech stack?
Alion reads every job posting Fellow 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 6, 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, "Fellow tech stack: 44 technologies from 8 job postings", as of Oct 6, 2026. https://alion.io/company/fellow-4/technologies