Piotr Mierzejewski

Built and led a high performance team that: • Transformed PKO Faktoring into Poland’s first cloud native factoring company, driving a 10× increase in customer base and 6.5× growth in assets over six years (while growing headcount by only 90%) • Delivered a WNDB CAGR of 33% (vs. 18% market average) in years 2020 - 2023 • Spearheaded digital transformation by launching a new core platform and over 50 IT modules • Initiated process optimization through generative AI • Developed and executed a fintech style growth strategy • Cultivated a high performance, growth mindset culture • Established PKO Faktoring as a market leader — earning WOA WOW “Best AI Application in Factoring” 2024, Business Superbrands 2024, and multiple industry nominations • Orchestrated cross functional go to market, sales, and stakeholder management to diversify revenue streams and strengthen market positioning

Focus on simplifications, performance improvement and growth. Quick wins in area of risk management. Enhanced processes, teams cooperation, internal procedures. Designed and implemented robust risk policies and procedures that supported PKO Faktoring’s transformation.

Main achievements are: - Design risk management strategy that propelled asset growth from PLN 2.8 bn to PLN 17 bn and support elevated PKO Leasing to the #1 market position - Reduction of non‑performing loans and cost of risk by 60% - Transformation of the Recovery Department from a cost centre into a profit centre by massive automation of processes - Automation of risk assessment processes - anabling a threefold increase in transaction throughput with the same size team - Led the integration of Raiffeisen Leasing’s IT and operations - Modernization of risk governance and introduction of advanced scoring/rating tools, strengthening portfolio quality and operational efficiency - Transformation of IT project management to more tribe oriented - Reinforced fraud identifications processes - Oversight of Internal Security Office

Sales, marketing, management, projects delivery - Head of Financial Services Risk Management & Performance Improvement Teams. Responsible for design, sales and delivery of 100 projects per year. Then, these projects were among the largest of the kind in Poland. We design, developed and implemented several IT tools like tool for automated testing of scoring and rating models (called PowerTester), work frame of tool for evaluation of financial instruments, simple toll for calculation of capital requirements, we also developed and implemented a full set of tools for risk management in a newly established Bank.

Team building, marketing, performance, projects delivery - responsible for setup and development of Financial Services Risk Management Team. Main sub teams were Risk IT, Regulatory, Data Analytics.

Sale, marketing, performance, delivery - focused on sales and delivery of projects in the area of risk management in financial institutions. Responsible for design and delivery of innovative IT solutions. Thanks to an excellent team, we developed and delivered unique products like a specific solution to capital requirement calculation under Basel 2 approach.

Neural networks researcher - PhD dissertation "Application of neural networks to standalone credit risk management". Teaching computer science, programming, neural networks, computer networks. I worked in the area of AI in specialised laboratories in Japan (RIKEN) and Canada (Camel Lab)

Products, systems development, proposals - Sales support and marketing for new solutions. Responsible for the introduction of SAS risk management solutions in the Polish market. Sold first in Poland large scale behebavioural scoring system for one of retail banks. Invention of SAS Scoring Engine (sold a few times in Poland in the financial and telco sector) and SAS GTI (Gate To Intelligence - never sold).

Responsible for rating models area in first Basel II implementation project in Poland. The challenge was connected at first with planning and budgeting huge project in undiscovered new area. As next steps I had to build the team and run implementation project. Very tuff experience was also constat negotiations of implementation approch with our Bank owner (it was BACA). Thanlks to that I discoverd influance of menthal and cultural aspects for work and achivements.

Responsible for preparation of scoring system implementation project in the Bank. Working as expert with aim to develop an approach to implementation and further evolution of automated risk assesment methods, models and IT systems for retail customers. My proposal was accepted by Management Board and implemented after that.

My thesis was that it is possible to design a structure of nonlinear Neural Network that rules of operation may be interpreted by a human analyst. I narrowed my research to area of standalone credit risk analysis. I proposed a method of structure construction and training of such NN. I checked the algorithms on data from 3 independent banks. I got their positive evaluations of my models.

Subject: "Application of the Levenberg-Marquardt optimization algorithm to train the Hyper Radial Basis Function Neural Network"