C++ Developer – telco sector (f/m/x)

🏢 Summary: The offer is for a C++ Developer role focused on building high-performance and high-reliability mobile network systems in the telecommunications domain. The position involves developing and maintaining solutions related to 5G, IoT, and next-generation network infrastructure within an agile environment. The role includes designing, implementing, testing, and debugging telecom systems using C++ and Linux. 🗂️ Requirements: Minimum 3 years of experience in C++ development, Experience in software development in the telecommunication industry, Experience with mobile network systems, Knowledge of network protocols and telecommunications standards, Strong experience with Linux development and debugging, Experience with Git version control, Experience with CMake build configurations, Fluent Polish, Communicative English, Residence in Poland 📃 Skills: C++, Linux, Git, CMake, 5G, IoT, Telecommunications, Scrum 🏢 Description: Join our team at Sii to work on an exciting project in the telco area. As a C++ Developer, you'll have the opportunity to develop pioneering advancements in 5G technology, IoT solutions, and next-generation network infrastructure. You will be contributing to projects that shape the future of global communication, working alongside top professionals in a dynamic and innovative environment. Be a part of something big and take your career to the next level with us! Your tasks Work as a C++ developer for high-performance and high-reliability mobile network systems and applications Collaborate with cross-functional teams to design, implement, and test new features and functionalities Troubleshoot and debug complex system issues, leveraging your knowledge of telecommunications protocols and standards Participate in code reviews and maintain coding standards, ensuring high-quality and maintainable code Create and/or manage CMake build configurations Work agile to provide high-value contributions as a member of a scrum team Requirements Experience in software development in the telecommunication industry (mobile networks preferred) Prior experience working with network protocols and telecommunications standards Minimum 3 years of experience in C++ development Strong experience with Linux operating systems, including development and debugging Familiarity with version control systems, such as Git, and collaborative development workflows Ability to work effectively in a team environment and communicate complex technical concepts clearly Good command of English (communicative for all work purposes) Fluent Polish required Residing in Poland 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 want to work on systems with high operational significance — apply now!

🏢 Summary: The offer is for a C++ Developer working on telecommunications systems, focusing on 5G, IoT, and next-generation network infrastructure. The role involves developing high-performance C++ applications, customizing Yocto-based embedded environments, and managing CMake build systems in Linux. You will contribute to mission-critical telco projects with strong emphasis on reliability, optimization, and integration. 🗂️ Requirements: Minimum 5 years of C++ development experience, Experience in telecommunications industry, Proficiency with Yocto, Strong knowledge of CMake, Strong experience with Linux development and debugging, Experience with network protocols and telecommunications standards, Experience with Git, Ability to work in team-based development environment, Fluent English, Fluent Polish, Residence in Poland 📃 Skills: C++, Yocto, CMake, Linux, Git, 5G, IoT, TCP/IP, Embedded, Networking 🏢 Description: Join our team at Sii to work on an exciting project in the Telco area. As a C++ Developer , you'll have the opportunity to work in the fields of C++ and Yocto development. Be a part of developing pioneering advancements in 5G technology, IoT solutions, and next-generation network infrastructure. You will be contributing to projects that shape the future of global communication, working alongside top professionals in a dynamic and innovative environment. Be a part of something big and take your career to the next level with us! Your tasks Development of C++ applications for telecommunications systems, ensuring high performance and reliability Customize and optimize Yocto-based build environments for embedded systems, tailoring solutions to project requirements Create and manage CMake build configurations to streamline the compilation of software components Develop and integrate software modules within Linux environments, addressing issues and implementing improvements Collaborate with cross-functional teams to design, implement, and test new features and functionalities Troubleshoot and debug complex system issues, leveraging your knowledge of telecommunications protocols and standards Participate in code reviews and maintain coding standards, ensuring high-quality and maintainable code Requirements Minimum 5 years of proven experience in C++ development, particularly in the telecommunications industry Proficiency with Yocto for embedded systems development and customization Solid understanding of CMake for managing project builds and dependencies Strong experience with Linux operating systems, including development and debugging Ability to work effectively in a team environment and communicate complex technical concepts clearly Experience with network protocols and telecommunications standards is highly desirable Familiarity with version control systems, such as Git, and collaborative development workflows Good command of English (spoken and written) Residing in Poland required Fluent in Polish 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 want to work on systems with high operational significance — apply now!

🏢 Summary: C Developer role in a low-level embedded 5G telecommunications project focused on developing high-performance, reliable software close to the hardware layer. The position involves building scalable, multi-threaded applications on Linux and working with telecom protocols in advanced mobile network systems. 🗂️ Requirements: Minimum 3 years of experience in C development, Strong proficiency in C for high-performance and reliable systems, Experience with multi-threaded application development on Linux, Experience with inter-process and cross-thread communication, Understanding of telecommunications protocols and mobile network systems, Ability to troubleshoot and debug system-level issues in Linux, Experience with CMake build configuration, Participation in code reviews and code quality practices, Fluent Polish, Communicative English, Residence in Poland 📃 Skills: C, Linux, Multithreading, IPC, CMake, 5G, Telecommunications, Debugging 🏢 Description: If you are looking for a new challenge as a C Developer, join a low-level embedded project in the telecommunications sector focused on 5G mobile network hardware. The role involves developing high-performance and reliable software close to the hardware layer for advanced telecom systems. If this opportunity sounds interesting to you, please apply. Your tasks Work as a C developer for high-performance and high-reliability mobile network systems and applications Develop scalable, multi-threaded functionalities using Linux OS and its multi-threading and cross-thread/cross-process communication capabilities Collaborate with cross-functional teams to design, implement, and test new features and functionalities Troubleshoot and debug complex system issues, leveraging your Linux OS and knowledge of telecommunications protocols and standards Participate in code reviews and maintain coding standards, ensuring high-quality and maintainable code Create and/or manage CMake build configurations Requirements Minimum 3 years of experience in C development Strong proficiency in C programming for developing high-performance and highly reliable systems Experience developing scalable, multi-threaded applications on Linux, including inter-process and cross-thread communication Solid understanding of telecommunications protocols and mobile network systems Ability to troubleshoot, debug, and optimize complex system-level issues in Linux environments Experience with build systems and code quality practices, including CMake configuration and participation in code reviews Good command of English (communicative for all work purposes) Fluent in Polish required Residing in Poland 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 want to work on systems with high operational significance — apply now!

🏢 Summary: C Developer role in a low-level embedded 5G telecommunications project focused on high-performance and reliable mobile network systems. The position involves developing scalable, multi-threaded software close to the hardware layer on Linux, including system-level troubleshooting and build configuration management. 🗂️ Requirements: Minimum 3 years of experience in C development, Strong proficiency in C for high-performance and high-reliability systems, Experience developing multi-threaded applications on Linux, Experience with inter-process and cross-thread communication, Understanding of telecommunications protocols and mobile network systems, Ability to troubleshoot and debug complex system-level issues in Linux, Experience with CMake build configuration, Experience participating in code reviews and maintaining code quality standards 📃 Skills: C, Linux, CMake, Multithreading, IPC, Telecommunications, 5G, Debugging 🏢 Description: If you are looking for a new challenge as a C Developer, join a low-level embedded project in the telecommunications sector focused on 5G mobile network hardware. The role involves developing high-performance and reliable software close to the hardware layer for advanced telecom systems. If this opportunity sounds interesting to you, please apply. Your tasks Work as a C developer for high-performance and high-reliability mobile network systems and applications Develop scalable, multi-threaded functionalities using Linux OS and its multi-threading and cross-thread/cross-process communication capabilities Collaborate with cross-functional teams to design, implement, and test new features and functionalities Troubleshoot and debug complex system issues, leveraging your Linux OS and knowledge of telecommunications protocols and standards Participate in code reviews and maintain coding standards, ensuring high-quality and maintainable code Create and/or manage CMake build configurations Requirements Minimum 3 years of experience in C development Strong proficiency in C programming for developing high-performance and highly reliable systems Experience developing scalable, multi-threaded applications on Linux, including inter-process and cross-thread communication Solid understanding of telecommunications protocols and mobile network systems Ability to troubleshoot, debug, and optimize complex system-level issues in Linux environments Experience with build systems and code quality practices, including CMake configuration and participation in code reviews Good command of English (communicative for all work purposes) Fluent in Polish required Residing in Poland 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 want to work on systems with high operational significance — apply now!

🏢 Summary: Senior C++ Developer role focused on building production-grade commercial software using modern C++ and MFC across the full software development lifecycle. The position involves software design, implementation, testing, code reviews, and performance optimisation in collaboration with an experienced engineering team. The offer includes long-term remote cooperation on a B2B contract. 🗂️ Requirements: Strong commercial experience with modern C++, Experience with MFC, Strong understanding of Object-Oriented Programming, Knowledge of SOLID principles, Experience with Microsoft SQL Server, Experience with query optimisation and execution plan analysis, Experience implementing and maintaining unit tests, Knowledge of software design patterns, Experience with performance profiling and optimisation, Experience delivering production-quality software, Experience working within the SDLC, English level B2/C1 📃 Skills: C++, MFC, SQL, SQLServer, OOP, SOLID, STL, Concurrency, Templates, UnitTesting, SDLC, C#, .NET 🏢 Description: Join an established software development team building production-grade commercial software. As a Senior C++ Developer, you'll work with modern C++ and MFC, contributing across the full software development lifecycle—from design and implementation to testing and delivery. You'll collaborate with experienced engineers, participate in code reviews and technical discussions, and help deliver high-quality software while driving continuous improvement. Requirements Strong commercial experience with modern C++ (C++11 and newer) , including memory management, templates, concurrency, and the C++ Standard Library Experience with MFC (Microsoft Foundation Class Library) Strong understanding of Object-Oriented Programming, including: SOLID principles encapsulation inheritance polymorphism Experience with Microsoft SQL Server, including query optimisation and execution plan analysis Experience implementing and maintaining unit tests across UI, back-end services, and database layers Knowledge of software design patterns Experience with performance profiling and optimisation techniques Experience delivering maintainable, production-quality software in a commercial environment Experience working within the Software Development Life Cycle (SDLC), including code reviews, design discussions, and collaborative delivery English at B2/C1 level Nice to Have Experience with C# Experience with the .NET ecosystem , particularly in cross-language integration or tooling We Offer B2B contract 120–150 PLN/h 100% remote work Long-term cooperation Immediate start Recruitment Process Recruitment screening Interview with the client Final decision

🏢 Summary: Senior C++ Developer role focused on developing and modernizing a complex Transport Management System (TMS) within an international logistics project. The position involves building new features, optimizing performance, and integrating a legacy solution into a modern SaaS platform. The role emphasizes work on performance-critical systems and long-term product transformation. 🗂️ Requirements: Strong knowledge of C++ (C++11 or newer), Experience with MS SQL, Solid understanding of memory management, Experience with templates, Experience with concurrency programming, Experience developing performance-critical applications, Understanding of SOLID principles, Knowledge of object-oriented programming, Knowledge of SDLC, Experience in software design, Experience in software architecture, Experience with unit testing, Experience with integration testing 📃 Skills: C++, MS, SQL, C++11, OOP, SOLID, SDLC, UnitTesting, IntegrationTesting, Concurrency, Templates 🏢 Description: Join an international project within the transport and logistics industry 🚚. We are looking for an experienced Senior C++ Developer to support the development and modernization of a complex TMS (Transport Management System) platform. The project involves both the development of new features and working with an existing solution that is gradually being integrated into a modern SaaS platform ☁️. This is an excellent opportunity for engineers who enjoy working on complex business systems, performance optimization, and modernizing applications with a long development history. 🎯 Your Responsibilities Develop and maintain applications in C++ Design and implement new features Optimize application performance and code quality Work with MS SQL databases Participate in technical analysis and solution design Collaborate with an international development team 🌍 Create and maintain unit and integration tests ✅ Requirements Strong knowledge of C++ (C++11 or newer) Experience with MS SQL Solid understanding of memory management Experience with templates and concurrency programming Experience developing performance-critical applications Good understanding of SOLID principles and object-oriented programming Knowledge of the Software Development Life Cycle (SDLC) Experience in software design and architecture Experience with unit and integration testing ⭐ Nice to Have Experience with C#/.NET Knowledge of .NET 9 Ability to influence and shape technical solutions and direction 🎁 What We Offer 100% remote work 🏠 Company-provided equipment 💻 Long-term project within an international environment 🌎 Real impact on the development of a strategic product Opportunity to contribute to the modernization and transformation of a large-scale business system

🏢 Summary: Development and maintenance of a C++/Qt desktop application supporting airport operations systems, including integration with external hardware and real-time data sources. The role involves contributing to system architecture, ensuring high code quality, and collaborating with international teams. The position requires strong expertise in real-time systems and software engineering best practices. 🗂️ Requirements: Minimum 5 years of commercial experience in C++, Commercial experience with Qt framework, Experience with real-time systems, Strong knowledge of software engineering best practices, Understanding of design patterns and SOLID principles, Experience with software testing, Ability to design and contribute to system architecture, Fluent English (written and spoken) 📃 Skills: C++, Qt, OOP, SOLID, Testing, Git, Real-time, Desktop, Integration 🏢 Description: Requirements: Minimum 5 years of commercial experience in C++ programming and working with the Qt framework. Strong knowledge of C++ and hands-on experience with Qt. Experience working with real-time systems. Solid understanding of software engineering best practices (design patterns, SOLID principles, testing). Ability to work independently and take responsibility for functionalities. Proactivity, engagement, and excellent communication skills. Experience in a team leader role is a plus. Fluent English (both written and spoken) is required for working in an international team. Responsibilities: Development and maintenance of a desktop application in C++/Qt for systems supporting airport operations. Integration with external systems such as radars, GPS, cameras, and sensors. Collaboration with international teams (development, QA, analysts). Ensuring code quality, testability, and stability of the solution. Contributing to the design and architecture of the system. We offer: Flexible working hours Hybrid work options (Office in Wrocław) Medical care program MultiSport Integrations events A contract of employment or self-employment, depending on You

🏢 Summary: Engineering role focused on developing and optimizing high-performance networking software, Linux drivers, and data path components for next-generation DPU systems. The position involves C/C++ development on Linux, packet processing optimization, and close collaboration with hardware teams on system bring-up and feature enablement. Open to experienced engineers working on low-level, high-throughput embedded networking solutions. 🗂️ Requirements: Minimum 5 years of commercial experience in similar role, Strong C and C++ development on Linux, Experience with networking systems (NICs, packet processing, data plane, I/O stacks), Understanding of Ethernet, IP, TCP, UDP protocols, Knowledge of Linux kernel internals and driver APIs, Experience with debugging tools, Git, and CI/CD workflows, Residing in Poland 📃 Skills: C, C++, Linux, Kernel, Drivers, Networking, NIC, Ethernet, IP, TCP, UDP, Git, CICD, DPDK, PCIe, DMA, RDMA 🏢 Description: As part of the DPU software group, you will develop and optimize networking software, drivers, and data path components for high-performance data processing. We have multiple openings for both junior and senior engineers, depending on experience level. You will work on cutting-edge Linux-based C/C++ systems, contributing to device driver development, packet processing frameworks, and system bring-up for next-generation DPU products. By joining us, you become a member of the Embedded Competence Center at Sii is an internal organizational unit, bringing together more than 500 specialists nationwide! We are currently working on about 100 projects for 50 clients from various industries including automotive, IoT, telecommunications and medical. Your tasks Develop and maintain DPU drivers and networking software stacks Integrate and optimize fast-path packet processing components Debug and profile data path performance issues Collaborate with hardware and firmware teams on feature enablement and bring-up Participate in design reviews, code reviews, and continuous integration efforts Requirements Minimum 5 years of commercial experience in a similar position Hands-on C/C++ development experience on Linux Experience in networking systems: NICs, packet processing, data plane, or I/O stacks Understanding of Ethernet/IP/TCP/UDP networking protocols Familiarity with Linux kernel internals and driver APIs Experience with debugging tools, git, and CI/CD workflows Good knowledge of spoken and written English (everyday communication) Strong analytical mindset, ownership, and collaborative attitude Residing in Poland required Nice to have Experience in device driver design, debugging, and testing (kernel or user space) Previous work with DPDK fast-path applications and optimization Hands-on SW/HW integration (PCIe, DMA, interrupts, counters, telemetry) Knowledge of congestion/flow control and high-rate packet processing Understanding of RDMA (verbs, QPs, completion model, transport semantics) Experience with unit/integration testing and performance observability tools 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 want to work on systems with high operational significance — apply now!

🏢 Summary: Embedded C++ developer role focused on IoT/cloud-connected heating system software using Embedded Linux, Qt, and SomeIP communication. The position involves developing HMI and control features, testing embedded applications, and collaborating in agile international teams within a SAFe environment. Hybrid work model with quarterly travel to Germany. 🗂️ Requirements: Strong C++, Object-oriented programming, Qt, Embedded Linux, SomeIP, GoogleTest, RobotFramework, Agile, Scrum, English, German 📃 Skills: C++, Qt, Linux, SomeIP, GoogleTest, RobotFramework, Python, IoT, Simulink, CI/CD, Scrum, SAFe 🏢 Description: Work in an international team. The R&D project focuses on communication and integration of devices with the cloud/IoT. Our expectations - Strong C++ programming (object-oriented) with QT practical knowledge - Embedded Linux development - SomeIP communication protocols - Testing frameworks: Google Test, Robot Framework - Agile development experience, Scrum - English or German proficiency - Hybrid role (70% remote / 30% onsite in Katowice) - Requires quarterly business travel to Germany to participate in planning Welcome Skills - IoT concepts and heating systems knowledge/experience (especially heat pumps) - Model-based development knowledge (Simulink) - CI/CD know-how Key tasks - Develop and maintain C++ based embedded software (Embedded Linux) for heating system control - Implement graphical user interfaces using QT library - Integrate with system architecture via SomeIP communication - Perform unit testing (Google Test), static code analysis and support system-level test (Robot Framework and Python) - Work and collaborate in agile teams to meet sprint goals The candidate will work in the SCI Stream, currently 6 agile teams focused on SystemControl and HMI software features for products like heat pumps, boilers, and system solutions. The mission is to deliver customer-centric solutions through fast integration, continuous testing, and impactful demonstrations. Tasks include developing heating/cooling features and commissioning functionalities, enabling Smart Home integration, and supporting system products and accessories. The teams are working as part of an overall Solution Train within the SAFe framework. The role involves strong collaboration within the software development team and across the SCI stream.

🏢 Summary: B2B contract for an experienced C++ Developer to build and maintain a high‑availability order‑capture system used across multiple financial distribution channels. The role focuses on low‑level C++ development in POSIX environments, implementing trading and order processing features, and ensuring system stability in clustered, load‑balanced architectures. Work includes integration with external systems, performance optimization, and support of complex financial workflows. 🗂️ Requirements: Strong experience in C++ development, Experience in banking or finance projects, Experience with Unix/Linux environments, Knowledge of POSIX APIs, Understanding of multithreading, Understanding of IPC, Understanding of networking concepts, Experience with shell scripting (Bash), Experience with relational databases, Ability to work with legacy codebases, Experience with complex business process systems, Good English (minimum B2) 📃 Skills: C++, POSIX, Unix, Linux, Solaris, Make, CC, Multithreading, IPC, Networking, Bash, Oracle, SQL, HTTPS 🏢 Description: Be | Shaping the Future Poland has a proven position of being a reliable partner for financial services organisations to analyse complex requirements, find solutions and implement them in their entirety, regardless of their complexity. Since the foundation of Be Poland in 2013, we have been continually expanding and customising our spectrum of services. Today, we are privileged to have in our team the best individuals in each sector we operate within the financial services industry. We are looking for a skilled C++ Developer to support the backend development of a high‑availability order‑capture system used across multiple distribution channels (branches, call centers, online trading). The system handles security order entry, validation, updates, cancellations, and integrates with numerous surrounding applications. Location: Remote from Poland Contract Type: B2B Responsibilities: Develop and maintain C++ components in POSIX environments using Make and CC toolchains on Solaris and Linux platforms Implement features for order entry, validation, STP processing, and workflows for external and internal markets Work on modules supporting real‑time quote trading, fixed‑price bond trading, new issue subscriptions (IPOs), standing orders, deposit transfers, and closed‑end fund subscriptions Maintain and improve complex search functionality for securities Ensure system stability within a high‑availability architecture (clustered servers, load‑balanced environments, and resilient database setups) Collaborate with teams integrating the system with browser clients, extranet channels, direct banking flows, and external WebServices (via HTTPS) Communication with business counterparts to align on implementation details Support troubleshooting, performance optimization, and production operations Requirements: Strong experience in C++ development (core language, low-level/system programming) Experience with banking/ finance projects is a must! Solid experience with Unix/Linux environments and POSIX APIs Good understanding of multithreading, IPC, networking, and system-level concepts Experience with shell scripting (e.g. Bash) Good experience with relational database, ideally Oracle Ability to debug and work within existing/legacy codebases Experience with a system that implements complex business processes ( ideally from the financial sector ) Experience with high availability or clustered systems is a plus Good English knowledge (at least B2 lvl) German knowledge is nice to have :) Our offer: Competitive remuneration on B2B contract Option to activate Medicover and Multisport on preferential terms Access to Mindgram – mental health & well-being platform Free gym at Q22 Personal development – internal online / onsite DevTalks Referral bonus program International environment