Summary
Overview
Work History
Education
Skills
LANGUAGES
Hobbies and Interests
Timeline
Tomasz Reczek

Tomasz Reczek

Warsaw

Summary

I am an experienced technical leader and software engineer with a strong background in building and managing backend systems, including blockchain integrations. I combine technical skills with team leadership to deliver scalable and reliable software solutions. I maintain a positive mindset regardless of circumstances. My career blends hands-on experience with AI and machine learning with a broad understanding of the software development process. With a background in consulting and finance, I bring business intuition and a strategic perspective, helping to align technical solutions with real business needs.

Overview

12
12
years of professional experience

Work History

Head of Backend

Elympics sp. z o.o.
04.2024 - Current
  • Led a 3-4 person backend team, encouraging autonomy and open dialogue, while focusing on trust and strong relationships. Responsible for task planning, prioritization.
  • Responsible for backend system design, scalability, performance, and long-term growth.
  • Developed and enhanced monitoring systems, primarily through Sentry and GitLab CI/CD, expanding existing Grafana-based monitoring.
  • Led several major system improvements, including database migration to the cloud and adoption of asynchronous communication with NATS.
  • Designed and built a service managing communication with the TON blockchain.

Backend Developer

Elympics sp. z o.o.
12.2022 - 04.2024
  • Development of microservices - from new feature delivery and automated integration/E2E testing to infrastructure management with Helm and Kubernetes, covering planning, deployment, and maintenance.
  • Developed and deployed a custom service for handling EVM blockchain communication, designed entirely from scratch.
  • Worked with multiple databases (MongoDB, PostgreSQL, Redis) and developed applications in C# (ASP.NET) and Python (FastAPI).
  • Operated directly on live production systems, delivering updates and fixes with a focus on risk mitigation and service continuity.

Business Data Scientist

Nethone sp. zo.o.
01.2022 - 11.2022
  • Preparing fraud prevention setups for several companies from digital lending and travel markets
  • Monitoring and retraining of existing ML models
  • Development of an internal software solution responsible for the whole ML production cycle

Machine Learning Engineer

Daftmobile sp. z o.o.
06.2021 - 01.2022
  • Involved in R&D project 'Elympics' that simplifies the development of multiplayer video games
  • Building and integrating the ML-based matchmaking service and AutoML built on top of celery and MLflow framework
  • Integration with Kubernetes cluster

Data Scientist

Grupa Żywiec S.A
01.2019 - 06.2021
  • Led optimization projects across sales, logistics, and marketing, including a store-level recommendation system, cooler allocation algorithm, a route optimization for transportation.
  • Delivered over 20 training sessions on machine learning, deep learning, and advanced Python for the team.

Financial Controller

Grupa Żywiec S.A
05.2016 - 01.2019
  • Budgeting and financial reporting for key managers from IT, HR, Finance, PR including CEO, CFO, IT Director and HR Director

Auditor

EY sp. z o.o. | Deloitte Sp. z o.o.
10.2013 - 03.2016
  • Assisting and performing financial statements revisions in more than 30 companies including leaders on FMCG and telecommunication markets

Education

Postgraduate Certificate - Deep Neural Nets in Digital Media

Politechnika Warszawska
01.2020

Postgraduate Certificate - Statistical Analysis and Data Mining in Business

Szkoła Główna Handlowa
01.2019

Master's degree - Finance, Accounting and Insurance

Uniwersytet Warszawski
01.2016

Bachelor's degree - Finance and Accounting

Uniwersytet Warszawski
01.2012

Skills

  • Python
  • C#, ASPNet
  • Microservices management
  • Machine Learning
  • API development
  • PostgreSQL
  • MongoDB
  • Blockchains: EVM, TON
  • Docker
  • Kubernetes

LANGUAGES

Polish - Native
English - Fluent

Hobbies and Interests

video games, psychology, team sports, table tennis

Timeline

Head of Backend - Elympics sp. z o.o.
04.2024 - Current
Backend Developer - Elympics sp. z o.o.
12.2022 - 04.2024
Business Data Scientist - Nethone sp. zo.o.
01.2022 - 11.2022
Machine Learning Engineer - Daftmobile sp. z o.o.
06.2021 - 01.2022
Data Scientist - Grupa Żywiec S.A
01.2019 - 06.2021
Financial Controller - Grupa Żywiec S.A
05.2016 - 01.2019
Auditor - EY sp. z o.o. | Deloitte Sp. z o.o.
10.2013 - 03.2016
Uniwersytet Warszawski - Master's degree, Finance, Accounting and Insurance
Uniwersytet Warszawski - Bachelor's degree, Finance and Accounting
Politechnika Warszawska - Postgraduate Certificate, Deep Neural Nets in Digital Media
Szkoła Główna Handlowa - Postgraduate Certificate, Statistical Analysis and Data Mining in Business

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Tomasz Reczek