Klarna tech stack
Klarna builds mostly with Python, SQL, JavaScript, Node JS. Its stack also includes AWS, Amazon SageMaker, Scikit-learn, Amazon Redshift. Python is named in 39 of the 64 job postings Klarna published in the last 12 months (61%). Counted by Alion from the job postings of Klarna, updated Nov 11, 2026.
What programming languages does Klarna use?
Python is named in 61% of job postings at Klarna, followed by SQL (47%), JavaScript (19%), Node JS (11%).
Python
39 61%
SQL
30 47%
JavaScript
12 19%
Node JS
7 11%
Java
4 6%
TypeScript
4 6%
Erlang
2 3%
Elixir
1 2%
Show all (11)
What frameworks and libraries does Klarna use?
Scikit-learn is named in 11% of job postings at Klarna, followed by LightGBM (6%), PyTorch (6%), React.js (6%).
Scikit-learn
7 11%
LightGBM
4 6%
PyTorch
4 6%
React.js
4 6%
FastAPI
3 5%
LIME
2 3%
React Native
2 3%
Show all (21)
What databases does Klarna use?
Amazon Redshift is named in 6% of job postings at Klarna, followed by DynamoDB (2%), ElasticSearch (2%), PostgreSQL (2%).
What cloud and platforms does Klarna use?
AWS is named in 44% of job postings at Klarna, followed by Amazon SageMaker (16%), Amazon S3 (14%), Spark (14%).
AWS
28 44%
Spark
9 14%
AWS Lambda
7 11%
Apache Kafka
6 9%
Databricks
5 8%
Datadog
5 8%
Show all (21)
What developer tools does Klarna use?
Docker is named in 11% of job postings at Klarna, followed by Terraform (11%), pySpark (11%), Jenkins (8%).
Docker
7 11%
Terraform
7 11%
pySpark
7 11%
Jenkins
5 8%
Cursor
4 6%
Git
3 5%
Ansible
2 3%
Show all (20)
What AI and ML technologies does Klarna use?
LLM is named in 17% of job postings at Klarna, followed by BERT (5%), Claude (2%).
Which engineering practices does Klarna ask for?
CI/CD is named in 19% of job postings at Klarna, followed by Machine Learning (16%), AI Agents (8%), IAM (8%).
CI/CD
12 19%
AI Agents
5 8%
Anomaly Detection
4 6%
Incident Management
4 6%
Embeddings
3 5%
Show all (14)
What does each Klarna team work with?
The technologies each team's postings require most often, with the number of postings that require them.
Data Science
18 postingsFinance
12 postingsSecurity
6 postingsBackend
6 postingsAI/ML
5 postingsIndustrial Engineering
5 postingsHow does your stack fit Klarna?
How much does Klarna pay by technology?
Median stated pay of the postings that name each technology, against the median of all Klarna postings with stated pay: $113k across 62 postings.
| Technology | Postings with pay | Median | vs company median |
|---|---|---|---|
| Python | 39 | $113k | 0% |
| SQL | 30 | $110k | −3% |
| AWS | 27 | $113k | 0% |
| JavaScript | 12 | $121k | +7% |
| LLM | 11 | $113k | 0% |
| Amazon SageMaker | 10 | $113k | 0% |
| Spark | 9 | $109k | −3% |
| Amazon S3 | 9 | $105k | −7% |
| Node JS | 7 | $119k | +6% |
| Scikit-learn | 7 | $113k | 0% |
How is the Klarna 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 Klarna stack?
Klarna scores 86 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 Klarna stack in its industry?
Share of the 1,035 companies in the same industries, whose stack Alion knows, that use each technology.
What sets Klarna apart
Companies with a stack like Klarna
Questions about the Klarna tech stack
What programming languages does Klarna use?
The languages named in Klarna job postings are Python (61%), SQL (47%), JavaScript (19%), Node JS (11%), Java (6%), as a share of the 64 postings of the last 12 months.
Does Klarna use Scikit-learn?
Yes. Scikit-learn is named in 7 of 64 job postings (11%) and required in 7 of them.
What cloud and platforms does Klarna use?
The cloud and platforms named in Klarna job postings are AWS (28), Amazon SageMaker (10), Amazon S3 (9) (postings in brackets).
What skills do you need for a Data Science job at Klarna?
Data Science postings at Klarna most often require Python (16), SQL (11), AWS (9), Amazon SageMaker (7), out of 18 postings in the last 12 months.
Is the Klarna tech stack changing?
Yes. Incident Management, Triton, BERT first appeared in Klarna job postings in the last six months.
How modern is the Klarna tech stack?
Klarna scores 86 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 Klarna tech stack?
Alion reads every job posting Klarna publishes and tags the technologies each one names. The figures on this page count the 64 postings of the last 12 months and were updated on Nov 11, 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, "Klarna tech stack: 94 technologies from 64 job postings", as of Nov 11, 2026. https://alion.io/company/klarna/technologies