Junior Data Scientist

Kreditz; Danderyds kommun; On-site; SEK 360,000 - 540,000; Full time

Benefits offered by this job

Wellness allowance

Gym access

Job summary

Kreditz is transforming credit risk using Open Banking data with a Junior Data Scientist role in Danderyd, Stockholm. You’ll work with ML Engineers to turn transaction data into high-precision risk insights, building features and models for our Kreditz Score and real-time fraud detection.

We value strong Python/SQL skills, statistical grounding, and the ability to explain complex results to non-technical stakeholders. This is a full-time position in a fast-growing European fintech.

Qualifications

• Bachelor's or Master's degree in Statistics, Data Science, Mathematics, Computer Science, Engineering, Quantitative Economics, or related quantitative field.
• 0-2 years of experience with Python and advanced SQL.
• Strong grounding in statistical inference, probability distributions, hypothesis testing, and supervised learning.
• Experience using visualization libraries or BI platforms to communicate findings to technical and non-technical audiences.
• Proven ability to break down ambiguous business questions into structured analyses.
• Rigorous approach to data sanity checks and validating results before sharing outputs.

Responsibilities

• Perform exploratory and granular data analysis on Open Banking datasets to uncover trends in income stability and default behavior.
• Design, test, and document domain-specific features for transaction categorization, credit risk scoring, and fraud detection.
• Support model lifecycle and validation using cross-validation, hyperparameter tuning, and evaluation metrics.
• Investigate model behavior and anomalies through root-cause analysis and data drift checks.
• Collaborate with ML Engineers to hand off modeling pipelines into production.
• Translate findings into dashboards, model docs, and presentations for product managers and stakeholders.

Skills

Python programming

SQL querying

Data analysis

Education

Bachelor's or Master's degree in Statistics, Data Science, Mathematics, Computer Science, Engineering, Quantitative Economics, or related field

Tools

pandas

NumPy

scikit-learn

Matplotlib

Seaborn

Plotly

Job description

Kreditz is transforming how businesses assess credit and risk using real-time data and NextGen Credit Scoring solutions.
As one of Europe’s fastest-growing FinTech scaleups - we’ve earned a place on the Sifted 100: Nordics & Benelux list in both 2024 and 2025 and most recently, we were proud to receive a double win at the Credit Management & Compliance Awards 2025, being named both Fintech Rocket of the Year and Breakthrough of the Year.
With strong growth across the Nordics and Europe, our clients range from leading banks and iGaming giants to fast-moving digital innovators.
Now, we’re looking for a Junior Data Scientist who can help transform a high-performing fintech into a billion-dollar business.

About The Position

Kreditz AI/Product team is looking for a Junior Data Scientist to help turn Open Banking transaction data into high-precision credit risk, affordability, and fraud insights. As a regulated AISP and licensed credit reference provider across European markets, Kreditz builds the scoring models, income verifications, and risk detection rules that power modern automated lending. You will work directly on the data analysis, feature engineering, and predictive models behind our core products, alongside our ML Engineers and Senior Data Scientists.

What Can Kreditz Offer

• A once-in-a-lifetime growth journey, from startup to Global scaleup
• A journey where everyone in the team plays a crucial role for our company’s success
• Fun-loving, driven, and passionate colleagues who support each other’s success
• A culture that celebrates progress, humility, and teamwork
• We win together
• 24/7 access to gym, sauna and sports facilities at our office, plus additional wellness allowance
• Competitive base salary

RESPONSIBILITES

Some Of The Main Responsibilities You Will Cover

• Perform exploratory and granular data analysis on large-scale Open Banking (PSD2) transaction datasets, uncovering trends in income stability, recurring obligations, discretionary spending, and default behavior across European markets.
• Design, test, and document domain-specific features for our transaction categorization engine, credit risk scoring models (e.g., Kreditz Score), and real-time fraud detection systems.
• Support model lifecycle and validation: train, validate, and benchmark supervised learning models (logistic regression, XGBoost/LightGBM, decision trees) using cross-validation, hyperparameter tuning, and standard evaluation metrics (AUC-ROC, Gini, KS-statistic, F1-score).
• Investigate model behavior and anomalies through root-cause analysis on edge cases, data drift, and performance discrepancies across banking connections, transaction taxonomies, and cross-border implementations.
• Collaborate with Machine Learning Engineers to ensure seamless handoff of verified modeling pipelines and features into production.
• Translate technical findings into actionable dashboards, model documentation, and clear presentations for product managers, internal risk committees, and external client stakeholders.

WE ARE LOOKING FOR

• Bachelor's or Master's degree in Statistics, Data Science, Mathematics, Computer Science, Engineering, Quantitative Economics, or a related quantitative field.
• 0-2 years of experience with strong proficiency in Python (pandas, NumPy, scikit-learn, SciPy) and advanced SQL for querying large relational and semi-structured datasets.
• Solid grounding in statistical inference, probability distributions, hypothesis testing, and supervised learning algorithms, with a strong desire to understand why a model behaves as it does.
• Experience using visualization libraries (matplotlib, seaborn, Plotly) or BI platforms to communicate findings to both technical and non-technical audiences.
• Proven ability to break down ambiguous, open-ended business questions into structured, hypothesis-driven analyses.
• Rigorous approach to data sanity checks, unit testing your analysis, and validating your own results before sharing outputs.

WHY JOIN NOW?

Kreditz is scaling from startup to global fintech leader, and this role sits at the center of that growth: the models you help build directly power automated lending decisions across European markets. You'll join at a stage where your work has outsized visibility and impact, working alongside experienced ML Engineers and Senior Data Scientists while helping shape how the team builds and validates models going forward.

APPOINTMENT OF ROLE

Q3/Q4 2026

SCOPE

Full-time, permanent employment (tillsvidareanställning)

SALARY

Competitive salary

REPORTING

You will be reporting to the company’s CPO

WORKPLACE

Danderyd, Stockholm

RECRUITMENT PROCESS

Ongoing selection, we review candidates continuously.
Last day for applications 2nd October 2026

CRIMINAL RECORDS EXTRACT

As part of our recruitment process we will ask you to present a clean criminal records extract

CONTACT

Lorenzo Puccio, VP Strategic Operations, [e-mail]
For more information about the role feel free to reach out to our CPO Spilios Tzouras, [e-mail]
Intelligent credit- & risk decisions made easy with open banking & AI-technology