Affirm tech stack
Affirm builds mostly with Python, Kotlin, SQL, JavaScript. Its stack also includes AWS, Kubernetes, MySQL, React.js. Python is named in 266 of the 348 job postings Affirm published in the last 12 months (76%). Counted by Alion from the job postings of Affirm, updated Nov 12, 2026.
What programming languages does Affirm use?
Python is named in 76% of job postings at Affirm, followed by Kotlin (57%), SQL (20%), JavaScript (16%).
Python
266 76%
Kotlin
199 57%
SQL
70 20%
JavaScript
57 16%
TypeScript
29 8%
Java
18 5%
Apex
4 1%
PHP
3 1%
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What frameworks and libraries does Affirm use?
React.js is named in 14% of job postings at Affirm, followed by React Native (10%), Vue.js (5%), XGBoost (3%).
React.js
49 14%
React Native
34 10%
Vue.js
19 5%
XGBoost
9 3%
Flink
8 2%
LightGBM
7 2%
Ray
7 2%
CatBoost
6 2%
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What databases does Affirm use?
MySQL is named in 41% of job postings at Affirm, followed by Snowflake (9%), DynamoDB (3%), PostgreSQL (2%).
MySQL
144 41%
Snowflake
31 9%
DynamoDB
10 3%
PostgreSQL
8 2%
Redis
8 2%
TiDB
6 2%
Apache Iceberg
4 1%
CockroachDB
2 1%
Show all (10)
What cloud and platforms does Affirm use?
AWS is named in 52% of job postings at Affirm, followed by Kubernetes (46%), Spark (16%), GitHub (7%).
AWS
181 52%
Kubernetes
159 46%
Spark
54 16%
GitHub
24 7%
Azure
15 4%
Buildkite
13 4%
Okta
11 3%
Databricks
10 3%
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And 2 more, each named in fewer postings.
What developer tools does Affirm use?
Cursor is named in 9% of job postings at Affirm, followed by Terraform (8%), Claude Code (7%), dbt (5%).
Cursor
30 9%
Terraform
27 8%
Claude Code
24 7%
dbt
16 5%
Rest API
12 3%
Git
9 3%
Docker
8 2%
Copilot
6 2%
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What AI and ML technologies does Affirm use?
Claude is named in 7% of job postings at Affirm, followed by LLM (4%), ChatGPT (1%).
Which engineering practices does Affirm ask for?
Declarative UI is named in 16% of job postings at Affirm, followed by CI/CD (13%), AI Agents (13%), Machine Learning (11%).
Declarative UI
55 16%
CI/CD
46 13%
AI Agents
45 13%
Platform Engineering
18 5%
SLI/SLO/SLA
7 2%
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
208 postingsManagement
22 postingsAnalytics
15 postingsSecurity
15 postingsAI/ML
14 postingsFrontend
13 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: $193k across 264 postings.
| Technology | Postings with pay | Median | vs company median |
|---|---|---|---|
| Python | 193 | $180k | −7% |
| Kotlin | 138 | $173k | −10% |
| AWS | 123 | $183k | −5% |
| Kubernetes | 106 | $178k | −8% |
| MySQL | 97 | $172k | −11% |
| SQL | 59 | $205k | +6% |
| JavaScript | 45 | $213k | +10% |
| Spark | 43 | $225k | +17% |
| React.js | 37 | $225k | +17% |
| React Native | 26 | $225k | +17% |
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 83 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 124 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 (76%), Kotlin (57%), SQL (20%), JavaScript (16%), TypeScript (8%), as a share of the 348 postings of the last 12 months.
Does Affirm use React.js?
Yes. React.js is named in 49 of 348 job postings (14%) and required in 21 of them.
What cloud and platforms does Affirm use?
The cloud and platforms named in Affirm job postings are AWS (181), Kubernetes (159), Spark (54) (postings in brackets).
What skills do you need for a Backend job at Affirm?
Backend postings at Affirm most often require Python (195), Kotlin (175), AWS (151), Kubernetes (144), out of 208 postings in the last 12 months.
Is the Affirm tech stack changing?
Yes. ArgoCD, Self-Healing, SIEM, OpenTelemetry first appeared in Affirm job postings in the last six months.
How modern is the Affirm tech stack?
Affirm scores 83 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 348 postings of the last 12 months and were updated on Nov 12, 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: 155 technologies from 348 job postings", as of Nov 12, 2026. https://alion.io/company/affirm/technologies