Klarna tech stack
Klarna builds mostly with Python, SQL, JavaScript, Node JS. Its stack also includes AWS, Amazon SageMaker, Scikit-learn, LightGBM. Python is named in 36 of the 62 job postings Klarna published in the last 12 months (58%). Counted by Alion from the job postings of Klarna, updated Sep 26, 2026.
What programming languages does Klarna use?
Python is named in 58% of job postings at Klarna, followed by SQL (45%), JavaScript (15%), Node JS (8%).
Python
36 58%
SQL
28 45%
JavaScript
9 15%
Node JS
5 8%
TypeScript
4 6%
Java
3 5%
Erlang
1 2%
Scala
1 2%
What frameworks and libraries does Klarna use?
Scikit-learn is named in 16% of job postings at Klarna, followed by LightGBM (10%), PyTorch (6%), React.js (6%).
Scikit-learn
10 16%
LightGBM
6 10%
PyTorch
4 6%
React.js
4 6%
FastAPI
3 5%
LIME
3 5%
React Native
3 5%
SHAP
3 5%
Show all (21)
What databases does Klarna use?
Amazon Redshift is named in 6% of job postings at Klarna, followed by DynamoDB (3%), ElasticSearch (3%), PostgreSQL (2%).
What cloud and platforms does Klarna use?
AWS is named in 45% of job postings at Klarna, followed by Amazon SageMaker (19%), Amazon S3 (18%), AWS Lambda (15%).
AWS
28 45%
AWS Lambda
9 15%
Spark
9 15%
Apache Kafka
8 13%
Datadog
6 10%
Databricks
5 8%
Show all (21)
What developer tools does Klarna use?
Docker is named in 16% of job postings at Klarna, followed by Jenkins (13%), pySpark (11%), Terraform (10%).
Docker
10 16%
Jenkins
8 13%
pySpark
7 11%
Terraform
6 10%
Cursor
3 5%
Git
3 5%
Ansible
2 3%
Show all (17)
What AI and ML technologies does Klarna use?
LLM is named in 15% of job postings at Klarna, followed by BERT (5%).
Which engineering practices does Klarna ask for?
CI/CD is named in 23% of job postings at Klarna, followed by Machine Learning (19%), Anomaly Detection (10%), IAM (8%).
CI/CD
14 23%
Anomaly Detection
6 10%
AI Agents
4 6%
Incident Management
4 6%
SLI/SLO/SLA
4 6%
Show all (13)
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
21 postingsBackend
7 postingsSecurity
4 postingsAI/ML
4 postingsIndustrial Engineering
4 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: $111k across 59 postings.
| Technology | Postings with pay | Median | vs company median |
|---|---|---|---|
| Python | 36 | $112k | +1% |
| AWS | 28 | $109k | −2% |
| SQL | 28 | $108k | −3% |
| Amazon SageMaker | 12 | $112k | +1% |
| Amazon S3 | 11 | $107k | −4% |
| Scikit-learn | 10 | $110k | −1% |
| JavaScript | 9 | $120k | +9% |
| LLM | 9 | $112k | +1% |
| Spark | 9 | $109k | −2% |
| AWS Lambda | 9 | $107k | −4% |
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 82 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 Klarna stack in its industry?
Share of the 324 companies in the same industries, whose stack Alion knows, that use each technology.
What sets Klarna apart
Companies with a stack like Klarna
Maya
56 shared technologies
Klimb.io
68 shared technologies
Shyftlabs
58 shared technologies
3Pillar Global
68 shared technologies
Checkout.com
56 shared technologies
LexisNexis Intellectual Property Solutions
58 shared technologies
NS Global Corporation
58 shared technologies
CodeRoad
62 shared technologies
Questions about the Klarna tech stack
What programming languages does Klarna use?
The languages named in Klarna job postings are Python (58%), SQL (45%), JavaScript (15%), Node JS (8%), TypeScript (6%), as a share of the 62 postings of the last 12 months.
Does Klarna use Scikit-learn?
Yes. Scikit-learn is named in 10 of 62 job postings (16%) and required in 10 of them.
What cloud and platforms does Klarna use?
The cloud and platforms named in Klarna job postings are AWS (28), Amazon SageMaker (12), Amazon S3 (11) (postings in brackets).
What skills do you need for a Data Science job at Klarna?
Data Science postings at Klarna most often require Python (19), SQL (14), AWS (11), Amazon SageMaker (9), out of 21 postings in the last 12 months.
Is the Klarna tech stack changing?
Yes. Incident Management, SLI/SLO/SLA, BERT, Triton first appeared in Klarna job postings in the last six months.
How modern is the Klarna tech stack?
Klarna scores 82 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 Klarna tech stack?
Alion reads every job posting Klarna publishes and tags the technologies each one names. The figures on this page count the 62 postings of the last 12 months and were updated on Sep 26, 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: 86 technologies from 62 job postings", as of Sep 26, 2026. https://alion.io/company/klarna/technologies