Paweł Gąsiorowski, Developer in Warsaw, Poland
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Paweł Gąsiorowski

Verified Expert  in Engineering

Mathematics Developer

Warsaw, Poland
Toptal Member Since
January 25, 2021

Paweł is an experienced solution architect with broad technical and software development skills, able to solve the hardest problems thanks to his passion for mathematics. Every company he has worked for has experienced a significant change made by his work.


Data Hunting
Amazon Web Services (AWS), PostgreSQL, Elasticsearch, Kibana, Machine Learning...
Lublin Diocese
Flask-RESTful, Python 3, Logstash, Beats, Elasticsearch, Kibana, Rancher...
Contract Negotiation, Project Planning, Service-oriented Architecture (SOA)...




Preferred Environment

Jupyter Notebook, Bash, IntelliJ IDEA, MacOS

The most amazing...

...thing I have ever developed is a data science platform aiding scientist in big data analysis.

Work Experience

Board Member/IT Lead

2018 - PRESENT
Data Hunting
  • Designed and implemented a data science platform supporting scientists in working with large data sets using their preferred technologies while maintaining data integrity.
  • Developed multiple algorithms for predicting linear TV viewership.
  • Developed an expert opinion explaining the impact of changing the weighting methodology of the AGB Nielsen panel on the decline in linear TV viewership.
Technologies: Amazon Web Services (AWS), PostgreSQL, Elasticsearch, Kibana, Machine Learning, Keras, Pandas, Jupyter Notebook, HTML, CSS, JavaScript, Luigi, Cython, Python 2, Python 3, R

IT Solution Architect and Developer

2018 - PRESENT
Lublin Diocese
  • Designed architecture patterns for a solution with more than 30 microservices.
  • Designed and implemented processes supporting the client's key services.
  • Prepared a high and low-level design for microservices from user stories down to UML specifications.
Technologies: Flask-RESTful, Python 3, Logstash, Beats, Elasticsearch, Kibana, Rancher, Docker Compose, Docker, Postman, Camunda BPM, Spring Boot, Java 8

Senior Consultant

2018 - PRESENT
  • Developed an approach for migrating one of the world's biggest webMethods deployments.
  • Estimated the cost of projects with budgets of over one million dollars.
  • Prepared and negotiated the substantive scope of contracts.
Technologies: Contract Negotiation, Project Planning, Service-oriented Architecture (SOA), Java, webMethods

IT Analyst

2018 - PRESENT
Getin Noble Bank
  • Designed solutions for the company's biggest projects including PSD2, SCA, 3DS, and anti-fraud detection.
  • Developed a software implementation of HSM symmetric encryption, including handling multiple key components.
  • Diagnosed architecture performance bottlenecks using the analysis of the correlation between events and anomaly detection.
Technologies: SOAP, Service-oriented Architecture (SOA), REST, Enterprise Architecture, MongoDB, PostgreSQL, Oracle, Java 8, webMethods

Senior Consultant/Developer

2018 - 2018
Ministry of Education
  • Designed and developed an enterprise service bus integrating systems of the Ministry of National Education.
  • Designed elements of the software delivery process, from artifacts and analysis structure to the automation of code generation from analytical artifacts.
  • Designed and developed a monitoring solution for MuleESB.
Technologies: Groovy, UML, Logstash, Beats, Kibana, Elasticsearch, Docker Compose, Docker, Mule ESB, Service-oriented Architecture (SOA)


2018 - 2018
PKO Bank Polski
  • Developed solutions integrating multiple systems with the use of WebSphere Message Broker.
  • Optimized CI/CD processes for facades of integrated systems.
  • Helped with migrating the code repository from CVS to Git.
Technologies: Kibana, ESQL, Java 8, WebSphere Message Broker

Senior Consultant/Team Leader

2014 - 2017
  • Managed and led a team of 20+ developers and solution designers.
  • Designed and implemented a solution breaking one of the biggest telco monoliths.
  • Helped and guided junior developers to elevate from a junior to a senior level.
Technologies: Software Development Management, Team Management, Contract Negotiation, JavaScript, CSS, HTML, Enterprise Architecture, Java, Oracle, webMethods

Project Manager

2014 - 2014
LOT Polish Airlines
  • Managed a project implementing auxiliary services, which resulted in growth of income exceeding stakeholders expectations.
  • Restored faith in the IT department in the eyes of the eCommerce department.
  • Negotiated changes to the Amadeus booking software.
Technologies: Cost Estimation, Contract Negotiation, Microsoft Project, IT Project Management

Data Science Platform

Data science platform supporting scientists in working with large data sets using their preferred technologies like R or Python while maintaining data integrity. This platform allowed old-school math professors to work together with young statistics students on prediction algorithms.
2000 - 2006

Master's Degree in Computer Science

Warsaw University of Technology - Warsaw, Poland

1999 - 2002

Specialist Degree (Bachelor's Degree Equivalent) in Physics

University of Warsaw - Warsaw, Poland


PRINCE2 Foundation



Luigi, Pandas, REST APIs, Flask-RESTful, Keras


Camunda BPM, Postman, Docker Compose, Microsoft Project, Kibana, Logstash, WebSphere Message Broker, IntelliJ IDEA


webMethods, Oracle, Docker, Jupyter Notebook, MacOS, Rancher, Mule ESB, RStudio, Amazon Web Services (AWS)


Spring Boot


Service-oriented Architecture (SOA), REST, RESTful Development


UML, Java, Java 8, Python 3, JavaScript, CSS, HTML, Bash, C++, SAS, ESQL, R, Python 2, Groovy


Databases, PostgreSQL, Elasticsearch, MongoDB

Industry Expertise

Project Management


Mathematics, Physics, Decision Support Systems, Knowledge Management, Enterprise Architecture, SOAP, Project Planning, Software Development Management, IT Project Management, Cost Estimation, Team Management, Image Recognition, Robotics, Electronics, Contract Negotiation, Beats, Cython, Machine Learning, Statistics

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