Passion forTechnology

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With over 4,600 specialists, Sii is the TOP IT and Engineering services provider in Poland

Our offer Sii Competency Centers provide world-class services and solutions in the following technology areas.

Sii in numbers

Power people
space in m2
Yearly revenue
in millions of PLN
worked in 2018

Our references

Green Hills Software


Sii established the cooperation with Green Hills Software as a part of an innovative R&D project for the Automotive industry. It focuses on the analysis of safety and communication reliability between vehicles and infrastructure. Sii engineers prepared a slot car demo in order to present the capabilities of the Green Hills Integrity operating system. It was enthusiastically received during the prestigious AESIN conference in Great Britain.


Martyn Oswin - Head of IT Development at DFC UK

What I really do appreciate is the fact that Sii is very responsive to my needs. I can be a quite demanding business partner and  if I have a need to scale up results very quickly Sii is ready to meet that need. And I’ve never yet been disappointed. That’s been good.


Samu Saastamoinen - CEO and Founder of Scrooge

We chose Sii as a business partner as it is cost-effective. Also, the company can offer the whole package – the development and maintenance, which in other countries is difficult to find. The cooperation between our companies is great. Though it has over 2000 workers, we feel like we are dealing with another start-up as it is very flexible.


Gabriel Buchała - Chief Engineer CBU DELPHI

Sii Poland’s engineers are specialists who live up to our expectations as to their knowledge, ability to carry out most complex projects, work style and adopted approaches. As other corporations, we are obliged to follow certain procedures, processes, thus, even the project launch and commencement of cooperation with Sii required from Sii maximum flexibility, which in fact, came to us a pleasant surprise!


Marcin Matysiak - Head of IT Department

Sii Poland is our long-term partner committed to our development and success. Sii’s experts have projected immediate understanding of our needs and supported us throughout an extensive project with their extensive skills and professional advice. They completed our project on time and on budget, by which, they fully justified our trust and lived up to our expectations.


Adam Stańczak - Head of Application Department at ENERGA

The proposed by Sii Poland candidate turned out to be a perfect match for our projects. As a Project Manager, he impressed us with his professionalism and ability to learn quickly. If all Sii’s outsourcing resources perform so well, I highly recommend the company.


Waldemar Ściesiek - Managing Director at Pekao S.A. Bank

Sii Poland is far more than just a provider of IT services to us. With Sii’s characteristic features – innovativeness, professionalism and flexibility – the company soon turned into our strategic Technology Partner. Its support has been of a key value when optimizing sales and loan process, which resulted in higher efficiency of our employees and satisfaction of our clients.


Artur Lewandowski - Director of Development and Maintenance Application Portfolio C Department at mBank S.A.

I always praised Sii primarily for one important thing. Consultants recruted by Sii have very important in work soft skills. For many years, Sii is our key partner – and this is probably the best recommendation. We have very good opinion about company because cooperation proceed without any problems at all. Soft skills among the Sii consultants is a competetive differentiator.                                                                                                                                        

We keep on expandingto easily connect our specialists with clients worldwide.

Career Portal

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The high quality of services we provide to our clients is attained thanks to the engagement of our Sii Power People in each location. Learn more about development opportunities at Sii on our Career Portal!

Press room

Industry recognition We are proud to be regularly honored with awards recognizing our leadership in the IT and Engineering market, rampant development and dedication to achieving worker and client satisfaction.

Proof of Standards The high quality of provided services and our observance of the most rigorous security standards are confirmed by world-recognized certificates.