Circle tech stack
Circle builds mostly with JavaScript, Ruby, TypeScript. Its stack also includes Figma, MySQL, PostgreSQL, React.js. JavaScript is named in 4 of the 8 job postings Circle published in the last 12 months (50%). Counted by Alion from the job postings of Circle, updated Sep 28, 2026.
What programming languages does Circle use?
JavaScript is named in 50% of job postings at Circle, followed by Ruby (50%), TypeScript (25%).
What frameworks and libraries does Circle use?
React.js is named in 50% of job postings at Circle, followed by Ruby on Rails (50%), Next.js (25%), Tailwind CSS (25%).
What databases does Circle use?
MySQL is named in 50% of job postings at Circle, followed by PostgreSQL (50%).
MySQL
4 50%
PostgreSQL
4 50%
What cloud and platforms does Circle use?
Figma is named in 50% of job postings at Circle.
Figma
4 50%
What developer tools does Circle use?
Claude Code is named in 50% of job postings at Circle, followed by Cursor (50%), Lovable (50%).
What AI and ML technologies does Circle use?
Claude is named in 50% of job postings at Circle, followed by LLM (25%).
Which engineering practices does Circle ask for?
A/B Testing is named in 50% of job postings at Circle, followed by AI Agents (25%), Edge AI (25%), RAG (25%).
What does each Circle team work with?
The technologies each team's postings require most often, with the number of postings that require them.
Backend
4 postingsDesign
4 postingsHow does your stack fit Circle?
How is the Circle 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 Circle stack?
Circle scores 91 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 Circle stack in its industry?
Share of the 136 companies in the same industries, whose stack Alion knows, that use each technology.
Companies with a stack like Circle
Questions about the Circle tech stack
What programming languages does Circle use?
The languages named in Circle job postings are JavaScript (50%), Ruby (50%), TypeScript (25%), as a share of the 8 postings of the last 12 months.
Does Circle use React.js?
Yes. React.js is named in 4 of 8 job postings (50%) and required in 4 of them.
What cloud and platforms does Circle use?
The cloud and platforms named in Circle job postings are Figma (4) (postings in brackets).
What skills do you need for a Backend job at Circle?
Backend postings at Circle most often require JavaScript (4), MySQL (4), PostgreSQL (4), React.js (4), out of 4 postings in the last 12 months.
Is the Circle tech stack changing?
Yes. Next.js, Tailwind CSS, TypeScript first appeared in Circle job postings in the last six months.
How modern is the Circle tech stack?
Circle scores 91 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 Circle tech stack?
Alion reads every job posting Circle 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 Sep 28, 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, "Circle tech stack: 19 technologies from 8 job postings", as of Sep 28, 2026. https://alion.io/company/circle/technologies