I have more than 15 years of experience in working with multiple languages like C, C++, C#, Java, Objective-C, Swift, PHP, Python etc on multiple platforms like Windows, Mac OSX, Linux (various flavors like Ubuntu, CentOS, Redhat, etc.), Android, iOS, etc.
I have worked with a US startup to develop a SQL engine in C/C++ which can be compiled on multiple platforms with conditional compiles and forms the basis of multiple language bindings like C#, Java (using JNI), Objective-C, Swift, etc. I have also worked on a number of open source projects for encryption algorithms and communication algorithms to customize and integrate them with the SQL engine.
I have worked in the financial sector extensively in the US programming in C/C++ specifically for transaction processing of more than 10 million transactions a day within a short windows of 3 hours and provide processed transactions and reports to more than 2500 banks and financial institutions.
Please message me via PM if you think my experience will fit your needs. If required I can sign a NDA.