Sii is a Polish software and IT services company founded in 2000, headquartered in Warsaw. The company provides custom software development, technology consulting, and IT services to enterprise clients across multiple industries. With approximately 3,500 employees across major Polish cities including Krakow, Wroclaw, and Poznań, Sii ranks among Central and Eastern Europe's largest independent IT services providers. The company became privately held through private equity partnership in 2021. Sii differentiates itself through strong engineering talent, specialized domain expertise, and long-term client relationships. The organization continues expanding geographic and service capabilities across the European market.
Sii maintains a professionally-oriented, technically-driven culture centered on reliable client delivery and project execution. As an established regional services leader, the company emphasizes engineering quality, stable employment practices, and pragmatic management. Known for steady growth and deep client partnerships in the enterprise software and consulting sectors.
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