Klarna Bank AB
Stockholm, Sweden
Lead Data Scientist
Nov 2023 – Present- Led EU consumer credit risk for short- and long-term loans; built PD/EAD models with calibration and segmentation, reducing defaults by 15% and driving $10M+ impact.
- Used SQL and Python for cohort- and event-level analysis of arrears, defaults, approvals, and portfolio performance.
- Designed and analysed A/B and multivariate tests across underwriting, pricing, and repayment flows.
- Monitored model health (AUC, PSI, calibration, feature drift); built centralized monitoring, alerts, and a GenAI risk review tool reducing investigation time by 40%.
- Led a team of 3 data scientists, owning roadmap, standards, and end-to-end delivery.
- Built automated deployment and monitoring pipelines, cutting model cycles from months to weeks.
Senior Data Scientist
Nov 2020 – Nov 2023- Built global search serving 10M+ daily queries across 20+ markets; improved CTR by 67% and saved $200K+ annually by replacing legacy vendor.
- Developed automated moderation and classification systems, reducing review time by 60% and improving ad targeting relevance.
- Partnered with ML engineers to design low-latency, multi-regional search infrastructure at scale.
- Led team of 6 (4 ML engineers, 2 data scientists); owned roadmap, OKRs, and cross-functional stakeholder alignment.
- Drove ML best practices through company-wide knowledge sessions and individual coaching.