IT Service Providers

Sii Sp. z o. o

Polish IT and engineering services group covering software development, testing, infrastructure and business process outsourcing

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TrustList summary

Sii Sp. z o. o is an IT, engineering and business process services group headquartered in Poland, with additional branches in Sweden, Ukraine, India and Malaysia. It staffs and delivers projects for large international clients, and it calls its employees Power People.

What Sii Sp. z o. o offers

Software development and testing: building and verifying applications for client projects.
Infrastructure and IT operations: managing client systems, including service desk and user support.
System integration and maintenance: connecting platforms and keeping them running.
Engineering and embedded systems: product engineering work for hardware-related industries.
Platform and data services: Business Intelligence, Dynamics 365, Office 365, Salesforce and SAP.
Business process outsourcing and cybersecurity: operational services and security work.

Who it works with

Clients come from banking and finance, insurance, telecommunications, high tech and semiconductors, utilities and energy, consumer goods, logistics and several other sectors.

Key facts

Based in: Poland
Team: more than 4 500 people
Offices: Poland, Sweden, Ukraine, India and Malaysia
Partnerships: Google Cloud and Workday HCM practices
Recognition: ranked first among Polish IT service firms in the Computerworld TOP200 for the sixth time, in the 2025 edition

Summary written by TrustList from the business's own published information, Oct 2026.

Sii Sp. z o. o rankings

Sii Sp. z o. o is ranked on 2 TrustList rankings: #7 on 1 and #8 on 1.

Every ranking orders its listings by their reviews, how complete the profile is and the Trust Score. Sii Sp. z o. o has no reviews yet and 3 of the 10 profile details we look for. Where no listing on a page has been reviewed, the order follows the profiles alone.

It service provider · 2 rankings

#7of 13
Php › Sweden
It is the only one of the 13 here listing cybersecurity and iPhone.
Of the 13 here, 11 also cover web development and 6 also cover IT services.
Behind Processia, ahead of Inteleon AB.
#8of 32
Ios app › Sweden
It is the only one of the 32 here listing salesforce and SAP.
Of the 32 here, 31 also cover android and 23 also cover web design; 2 also work in Poland.
Behind ayond AB, ahead of Boldsie.