December 17, 2025

C++ Developer with OpenShift/OpenStack Experience – telco sector

Senior • Remote

Białystok, Poland

Sii ensures that all employment-related decisions are made solely on the basis of qualifications and competencies. We are committed to equal treatment of all individuals, regardless of any protected characteristics, and promoting a diverse and inclusive work environment.

We are currently seeking a C++ Developer to join one of our telecommunications projects as part of a global R&D engineering team. You will be responsible for developing, improving, and validating software within a next-generation IMS platform, working closely with system architects and technical teams throughout the feature design process.

Your tasks

Design, implement, and enhance high-performance C++ software for telecom systems
Work closely with system architects and engineering teams to define features and contribute to technical design solutions
Analyse, debug, and resolve complex production issues, ensuring smooth operation of deployed systems
Ensure software quality, reliability, and performance through proactive monitoring and validation of solutions
Provide ongoing technical support and participate in process improvements to optimize system performance and development workflows

Requirements

At least 4 years of professional experience in software development using C and C++
Solid background in Linux environments, including scripting and programming (e.g., Python, Bash)
Hands-on experience with automation pipelines and build systems, including CI/CD practices
Experience working with cloud or container platforms such as OpenShift or OpenStack
Background knowledge of telecommunication systems is highly desirable, particularly within IMS (IP Multimedia Subsystem)
Familiarity with telecom signalling protocols, especially SIP and Diameter, is considered a strong advantage
Residing in Poland required
Fluent Polsh and English required

What we offer

Great Place to Work since 2015 - it’s thanks to feedback from our workers that we get this special title and constantly implement new ideas
Employment stability - revenue of PLN 2.1BN, no debts, since 2006 on the market
We share the profit with Workers - over PLN 76M has already been allocated for this aim since 2022
Attractive benefits package - private healthcare, benefits cafeteria platform, car discounts and more
Comfortable workplace – class A offices or remote work
Dozens of fascinating projects for prestigious brands from all over the world
PLN 1 000 000 per year for your ideas - with this amount, we support the passions and voluntary actions of our workers
Investment in your growth – meetups, webinars, training platform and technology blog – you choose
Fantastic atmosphere created by all Sii Power People

If you are passionate about cutting-edge telecom technologies and want to make a real impact, we encourage you to apply now!

Sii

Sii is a company recognized as a "Great Place to Work" since 2015, thanks to employee feedback and the implementation of new ideas. Established in 2006, Sii has demonstrated financial stability with a revenue of 2.1 billion PLN and no debts. The company shares its profits with employees, having allocated over 76 million PLN for this purpose since 2022. Sii offers a rich benefits package, including private healthcare, a cafeteria platform, and discounts on cars. Employees can work in comfortable A-class offices or remotely. Sii is involved in numerous fascinating projects for prestigious global brands and invests 1 million PLN annually to support employee passions and volunteer actions. The company emphasizes personal development through meetups, webinars, a training platform, and a technology blog. Sii is characterized by a fantastic atmosphere created by its "Sii Power People."