- Built several applications using Large Language Models (LLMs) and AI, including internal copilot for optimizing unit economics and an automated product addition tool.- Fine-tuned LLMs for function calling based on internal corporate knowledge.- Co-developed the AI and automation strategy for the company.- Created several PoCs for solutions based on AI agents.

-> Development- Managed the team developing four products: Plenti.app (web & react native), Plenti Backoffice (order & inventory management), and Plenti Partners (collaboration platform for businesses co-financing rental equipment).- Developed a new full-stack Next.js application, unified the environment across all products using the same technology, including CI/CD (GitHub) harmonization, Kubernetes + Argo, and migration to Google Cloud Platform.- Transitioned two primary product functionalities: internal subscription engine to Stripe (alongside payment processor change) and a client fraud verification tool to the emerging TransactionLink platform.-> Data Engineering- Migrated all pipelines to DBT, leveraging its SQL-based transformation capabilities to create a more consistent and manageable environment. Integrated with Cloud Functions and applications running on Google Kubernetes Engine.- Transitioned from Pandas to Polars, facilitating parallel processing without additional libraries, dramatically speeding up data processing and transformation times, reducing costs, and preparing some pipelines for Spark-like processing.- Implemented streaming processing with Dagster, shifting from batch data writing to real-time processing of changes in transactional databases for analytical purposes.- Redesigned the ETL process from BigQuery to a medallion architecture using BigLake and Spark, optimizing data workflows and improving performance.

- Managing four IT teams in different techstacks -> Frontend: React / Angular, Backend: Node.js (Nest.js / Next.js) and PHP (Laravel)- Running a huge project: new, reshaped eCommerce Product’s Architecture natively based on AWS as a baseline for whole set of eCommerce products- Managing cross-team cooperation, team development, building development paths for developers, implementing a transparent policy of assessment, validation and feedback within teams as well as strengthening the role of leaders and team leaders in teams- Animation of internal company collaboration between eCommerce teams and the rest of IT teams

- Building an IT team from scratch (backend - PHP, Python, Kubernetes, Frontend - Svelte, React)- Transition from old, backward solutions with huge technological debt to new solutions without losing operational stability and business growth rate- Product launch: New version of Avanti24.pl and the Avanti24.pl fashion marketplace - a click-through marketplace with integrated over 100 stores with advanced traffic analytics and a recommendation system- Creation of over 10 widgets (backend + frontend) that addressed various places of ad emission based on marketplace products- Refactor and development of over 30 internal business support tools- Building a data warehouse based on BigQuery / Data Studio + Google Functions from scratch- Conducting Domain Driven Design workshops, which allowed remodeling of startup infrastructure elements into more mature ones- Transition from on premise solutions to Amazon Web Services

- Collecting requirements, designing, producing and launching products based on the internal deep learning engine, which extended the offer for challenging customers- Working on solutions for ads inventory in mobile applications and prospecting traffic- Working with international clients from US, LATAM, APAC- Collaboration within a team with other Project Managers

Wirtualna Polska Holding is a holding of media and e-commerce companies, employing over 2,000 people, whose internet portfolio forms the largest group in the Polish Internet.Responsible for:- building the strategy of an advertising product dedicated to increasing sales in e-commerce stores based on data: WP Okazje (product retargeting & recommendation), Content Driven Commerce (content that specifies purchase intentions), RadarOkazji (product aggregator & marketplace specializing in product discounts) or display ads based on data & product feed- revenue KPIs- designing and building recommendation mechanisms based on the real intentions of purchasing users- effectiveness of e-commerce activities on the WP advertising space- management of the development team- cooperation with the sales department, evangelizing all departments in the company regarding the aspects of ROI, ROAS, COS, LTV or Customer Journey- segmentation and acquisition of the best traffic for e-commerce stores

Responsible for:- MVP launch of the WP Okazje project, which aggregates various product feeds and allows you to recommend and retargeting the products that have the best chance of conversion- effectiveness of the recommendation mechanism for users- revenue KPIs- management of the development team- combination of all WP e-commerce products into a coherent customer jouney path, which addresses all stages of the user's need from inspiration to conversion

Responsible for:- inspiration and implementation of the R&D project, which was to integrate WP frontend technology (React) with the possibility of sharing code with mobile applications (React Native) without giving up the quality, speed and stability of native mobile applications- cooperation with the development team- launch of the Pudelek application and resignation from the native application code based on ObjC (iOS) and Java (Android)

Responsible for:- building and implementing mobile product development strategies, both applications and mobile websites, such as the mobile version of the wp.pl home page, sportowefakty.pl, money.pl or applications such as WP24, Pudelek, OpenFM, Videostar, o2.pl- monetization of mobile products and revenue KPIs- running a team of product owners and mobile developers- cooperation with the product development department in the matter of developing best practices for mobile websites- cooperation with the product department of the advertising product over the mobile advertising offer- pilot of the online-offline connection project combining the range of mobile applications with data from beacons (using data to target offline behaviors online)

Responsible for:- building and implementing mobile product development strategies, both applications and mobile websites, such as the mobile version of the o2.pl home page, pudelek.pl or applications such as Pudelek and o2.pl- 3-times increase in the mobile inventory by creating mobile sites for the majority of traffic in the o2 Group- monetization of mobile products and revenue KPIs- running a team of mobile developers- cooperation with the product department of the advertising product over the mobile advertising product portfolio

Responsible for:- running projects related to the product development of the o2 Group websites- cooperation with Product Managers- cooperation with the development team

Responsible for:- editorial team organization- programming policy for TV- training of television reporters- cooperation with students' council- substantive and script support in live broadcasts