Senior Software Engineer

🚀 Senior C++ Software Engineer – Hardware-Connected Systems

📍 Barcelona, Spain | Hybrid – typically 2 days onsite per week

We’re looking for an experienced, hands-on C++ engineer who enjoys developing Windows software, working close to real hardware and solving challenging integration and performance problems.

You’ll join the Barcelona R&D team of a large, established global technology company, developing software for complex, high-performance hardware systems within a long-term engineering programme.

The role combines application and system-level development with device communication, hardware interfaces and data processing. It would suit someone who enjoys understanding how the complete system works and investigating problems across software and hardware boundaries.

💡 What You’ll Work On

• Develop and maintain modern C++ software, primarily using C++17

• Build Windows applications and system components that communicate with specialised devices and hardware

• Develop multithreaded software and improve performance, reliability and data handling

• Investigate integration issues across application code, interfaces, drivers and connected equipment

• Work with technologies including PCIe and Ethernet for high-speed data transfer

• Support system integration, debugging, validation and testing within an R&D/lab environment

• Work primarily on Windows, with some Linux development

✅ What We’re Looking For

• Strong commercial experience developing substantial applications or system software in modern C++

• Proven experience developing C++ software that runs on Windows

• Experience with hardware-connected software, device communication or comparable systems integration

• A good understanding of multithreading, concurrency and performance optimisation

• Strong debugging skills and a practical, methodical approach to solving technical problems

• The ability to take ownership of your work and collaborate with an international engineering team

Useful, but not essential: experience with instrumentation, PCIe, Ethernet, device drivers, data acquisition or high-throughput streaming.

You don’t need experience with every technology listed. Strong Windows C++ development and transferable hardware-facing systems experience are the priorities. Relevant backgrounds could include industrial automation, scientific or medical equipment, simulators, robotics and other device-connected applications.

📄 Contract & Long-Term Opportunity

• Initial 6-month freelance/autónomo contract with strong extension potential

• 40 hours per week

• Hybrid working – typically 2 days per week onsite in Barcelona

• An established, ongoing R&D programme with long-term scope

📩 Interested?

If you enjoy building C++ software that interacts with real equipment and solving complex debugging and performance challenges, I’d be happy to tell you more.