About Me

I am a partner in the Commercial group in Warsaw. My expertise spans from government contracts, IT implementation, and licensing agreements, to technology related disputes.

I have advised on numerous large scale IT projects, involving comprehensive implementation of complex software in both traditional and SaaS models.

I advise on all aspects of public procurement law, and represent clients in procurement disputes before the National Appeal Chamber and the courts. I have particular experience advising on infrastructure and IT projects, representing both contractors and contracting authorities.

Many of my clients are companies within the IT and technology sectors, although I also work with clients in the healthcare, energy, industrial automation, defence, and retail & consumer space.

My professional interests include legal aspects of the application of the latest technologies, such as blockchain, artificial intelligence, the internet of things, and cybersecurity. I have significant experience of advising tech start-ups.

I am an arbitrator at the Court of Arbitration of the Audiovisual Market at the Polish Audiovisual Producers Chamber of Commerce, and an expert at the Council of the Polish IT and Telecommunications Chamber. I also serve as an expert for the European Assistance for Innovation Procurement initiative.

I am recognised by Chambers & Partners, Legal 500 and Who's Who Legal as a leading individual in TMT, IP and public procurement.
  • Representing Siemens Mobility in the tender for supply of trains for Warsaw underground.
  • Representing Siemens Mobility in the tender for Intelligent Transport System in Tychy, Poland.
  • Support for Nokia in the creating the consortium for GSM R project for PKP PLK SA.
  • Representing clients in copyright levies disputes.
  • Legal support for Samsung Electronics in outsourcing project.


  • Law, University of Warsaw


  • Polish Bar Association
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Tomasz Zalewski acts for energy clients on contract exits and renegotiations, as well as tender proceedings. He also advises on procurement disputes. Clients praise him for his creativity as a practitioner, one asserting that he 'can think out of the box.'

Chambers Europe 2021 (Public Procurement - Band 2)

'Tomasz Zalewski – always a pleasure to talk to, very open minded and forward thinking.'

The Legal 500 EMEA 2021 (TMT - Leading individual)

'We worked with Tomasz Zalewski before and as always it was an extremely professional experience. Tomasz is very intelligent, educated, being able to explain the difficult legal predicaments in the simple way. He is always trying to find a solution that would be beneficial for his client but at the same time it would also satisfy the other side.'

The Legal 500 EMEA 2021 (TMT - Leading individual)

Latest insights

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Lower limit of maximum contractual penalties – new Polish public procurement case law

Nov 21 2023

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How to prove that a board member has no criminal record within public procurement procedures in Poland

Sep 15 2023

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The Supreme Court has opened the door for contractors to claim damages from contracting authorities that violate public procurement law. But how do things look in practice?

May 19 2023

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News & Deals

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Bird & Bird retains top ranking in the 2020 Who's Who Legal's analysis of Data

Feb 10 2020

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Tomasz Zalewski recognised as one of the most influential lawyers by the leading daily Polish legal press

Jan 29 2020

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