Affirm tech stack
Affirm builds mostly with Python, Kotlin, SQL, JavaScript. Its stack also includes AWS, Kubernetes, MySQL, React.js. Python is named in 182 of the 244 job postings Affirm published in the last 12 months (75%). Counted by Alion from the job postings of Affirm, updated Sep 27, 2026.
What programming languages does Affirm use?
Python is named in 75% of job postings at Affirm, followed by Kotlin (54%), SQL (20%), JavaScript (14%).
Python
182 75%
Kotlin
131 54%
SQL
48 20%
JavaScript
33 14%
TypeScript
22 9%
Java
16 7%
Apex
4 2%
PHP
1 <1%
What frameworks and libraries does Affirm use?
React.js is named in 12% of job postings at Affirm, followed by React Native (9%), Vue.js (5%), XGBoost (3%).
React.js
30 12%
React Native
22 9%
Vue.js
12 5%
XGBoost
7 3%
CatBoost
6 2%
LightGBM
6 2%
PyTorch
5 2%
Ray
5 2%
Show all (24)
What databases does Affirm use?
MySQL is named in 41% of job postings at Affirm, followed by Snowflake (10%), PostgreSQL (2%), DynamoDB (2%).
MySQL
99 41%
Snowflake
25 10%
PostgreSQL
6 2%
DynamoDB
5 2%
Apache Iceberg
4 2%
Redis
3 1%
TiDB
3 1%
BigQuery
2 1%
Show all (9)
What cloud and platforms does Affirm use?
AWS is named in 51% of job postings at Affirm, followed by Kubernetes (44%), Spark (17%), GitHub (8%).
AWS
124 51%
Kubernetes
107 44%
Spark
41 17%
GitHub
19 8%
Buildkite
12 5%
Azure
12 5%
Databricks
10 4%
Kubeflow
7 3%
Show all (34)
What developer tools does Affirm use?
Rest API is named in 15% of job postings at Affirm, followed by Cursor (11%), Claude Code (8%), Terraform (7%).
Rest API
37 15%
Cursor
27 11%
Claude Code
20 8%
Terraform
17 7%
dbt
14 6%
Git
8 3%
Copilot
6 2%
Docker
6 2%
Show all (26)
What AI and ML technologies does Affirm use?
Claude is named in 8% of job postings at Affirm, followed by LLM (3%), ChatGPT (<1%).
Which engineering practices does Affirm ask for?
CI/CD is named in 17% of job postings at Affirm, followed by AI Agents (14%), Declarative UI (14%), Machine Learning (12%).
CI/CD
41 17%
AI Agents
34 14%
Declarative UI
34 14%
Platform Engineering
22 9%
Show all (31)
What does each Affirm team work with?
The technologies each team's postings require most often, with the number of postings that require them.
Backend
138 postingsManagement
15 postingsProduct
12 postingsAI/ML
11 postingsAnalytics
11 postingsSecurity
9 postingsHow does your stack fit Affirm?
How much does Affirm pay by technology?
Median stated pay of the postings that name each technology, against the median of all Affirm postings with stated pay: $213k across 176 postings.
| Technology | Postings with pay | Median | vs company median |
|---|---|---|---|
| Python | 122 | $213k | 0% |
| Kotlin | 80 | $213k | 0% |
| AWS | 74 | $213k | 0% |
| Kubernetes | 62 | $213k | 0% |
| MySQL | 56 | $213k | 0% |
| SQL | 42 | $209k | −2% |
| Spark | 29 | $241k | +13% |
| JavaScript | 25 | $225k | +6% |
| React.js | 22 | $225k | +6% |
| Claude | 19 | $225k | +6% |
How is the Affirm 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 Affirm stack?
Affirm 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: 3; legacy ones: 0.
How common is the Affirm stack in its industry?
Share of the 1,373 companies in the same industries, whose stack Alion knows, that use each technology.
What sets Affirm apart
Companies with a stack like Affirm
Questions about the Affirm tech stack
What programming languages does Affirm use?
The languages named in Affirm job postings are Python (75%), Kotlin (54%), SQL (20%), JavaScript (14%), TypeScript (9%), as a share of the 244 postings of the last 12 months.
Does Affirm use React.js?
Yes. React.js is named in 30 of 244 job postings (12%) and required in 14 of them.
What cloud and platforms does Affirm use?
The cloud and platforms named in Affirm job postings are AWS (124), Kubernetes (107), Spark (41) (postings in brackets).
What skills do you need for a Backend job at Affirm?
Backend postings at Affirm most often require Python (126), Kotlin (112), AWS (101), Kubernetes (94), out of 138 postings in the last 12 months.
Is the Affirm tech stack changing?
Yes. Embeddings, Fine-tuning, Function Calling, Model Context Protocol first appeared in Affirm job postings in the last six months.
How modern is the Affirm tech stack?
Affirm 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: 3; legacy ones: 0.
How does Alion know the Affirm tech stack?
Alion reads every job posting Affirm publishes and tags the technologies each one names. The figures on this page count the 244 postings of the last 12 months and were updated on Sep 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, "Affirm tech stack: 135 technologies from 244 job postings", as of Sep 27, 2026. https://alion.io/company/affirm/technologies