About the Role
Join the best bank to work for in Bulgaria. Do you want to join a well-established bank with a start-up culture? We, at tbi, have been one of the most profitable banks for years and we are growing at a fast pace. We're a bank with a long history of success that operates as a start-up and we're always on the lookout for new opportunities to grow our business. Our team is made up of brave, passionate and caring people who want to transform into a mobile-first, state-of-the-art lifestyle ecosystem. 80% of our colleagues would recommend tbi as an employer to their friends and family.
We're looking for a Head of Data Science to join our team on the journey to success!
Responsibilities
•Lead the end-to-end development and deployment of analytical and generative AI models across Bulgaria, Romania, and Greece, from problem framing to production and measured business value.
•Deliver measurable value: launch models and data products that create profit for the bank, validated by Finance.
•Run all production models under one lifecycle standard: versioned, documented, peer-reviewed, monitored for drift, and recorded in a single model registry.
•Ensure every production model has a clear business owner, a value hypothesis, and a business process able to use it, and decline models the business cannot deploy.
•Integrate models into business decision-making, including the pricing decision engine, customer profitability, collections, churn, and reactivation.
•Establish science-grade practices: experiment design (A/B testing and quasi-experimental methods), reproducibility, peer review, and measurement.
•Increase MLOps maturity through automated deployment, monitoring, and retraining of models.
•Design and deploy generative AI solutions, such as AI-generated insight reports and conversational analytics, and be ready to lead a wider generative AI scope as the bank's Data & AI strategy evolves.
•Lead, develop, and retain high-performing Data Scientists and ML Engineers, building a culture where understanding the business and its data comes before modeling.
•Partner closely with business lines, Finance, Technology, and the other teams of the Data, Analytics & Monetization division across the three markets.
Requirements
•Master's degree or PhD in a quantitative field (statistics, mathematics, computer science, econometrics, physics, or similar).
•At least 5 years of hands-on experience in data science, machine learning, and generative AI, including at least 3 years leading teams, preferably in banking, fintech, or consumer lending.
•A proven end-to-end track record: models you personally took from idea to production with measured business impact, delivered independently.
•Strong hands-on generative AI expertise: large language models, retrieval-augmented generation, AI agents, and safe production deployment in a regulated environment.
•Strong technical depth: Python and SQL, machine learning frameworks, MLOps, and modern cloud data platforms (e.g., Snowflake, Azure).
•Strong command of experiment design, A/B testing, and causal inference.
•Understanding of lending economics (pricing, risk, unit economics, customer lifetime value) and the ability to connect analytical solutions with measurable business outcomes.
•Experience translating complex and ambiguous business problems into practical analytical solutions and presenting results to senior management.
•Ability to lead by doing, combining technical depth with people leadership.
•Fluent English, spoken and written.
Benefits
•Real growth opportunities to take your career to the next level
•Work on exciting, meaningful projects that make an impact
•Join a vibrant, international team of 23 nationalities
•Additional private health insurance
•Monthly food vouchers
•Exclusive perks & discounts – from Multisport cards to top retailers
•Special rates on tbi's banking products
•Work in the heart of Sofia – steps away from National Palace of Culture and South Park
•Pet-friendly office
To apply, please send your CV in English.
