Senior C/C++ Developer

We are looking for an experienced Senior C/C++ Developer to optimise the performance of a legacy system that processes large volumes of data through ETL pipelines and loads it into IBM Db2. The main goal is to identify and resolve performance bottlenecks as data volumes increase. Requirements: -Strong commercial experience with C and/or C++ (solid C knowledge is required). -Experience with performance optimisation, profiling and debugging. -Strong knowledge of multithreading (OpenMP, pthreads or similar). -Experience with relational databases and SQL. -Experience working with legacy systems. -Experience with AI-assisted development tools (Claude or similar). -English B2+/C1. Nice to Have: -IBM Db2 and Embedded SQL. -Intel OpenMP. -Experience with ETL and large-scale data processing. -Focus: Legacy system performance optimisation C++ developers are welcome if they are comfortable working with C code. Db2 experience is not mandatory.