While novice in freelancer..com I have large experience on development of Windows and Linux systems in C++. Plus these skills:
- C++ libraries: Boost, POCO
- C libraries: OpenSSL, cURL, GraphicsMagick
- distributed systems
- database oriented (PostgreSQL, SQL Server, Access)
- asynchronous network (Boost ASIO)
- network protocols (TCP, UDP, netcast)
- internet protocols (HTTP, HTTPS, SMTP, IMAP)
- IPC (named pipe, anonymous pipe), Protocol Buffers, gRPC, REST
- desktop (MFC, OLE, Qt)
- image processing
- Java, C#
- JavaScript, NodeJS
- Python, Bash, PowerShell
- Wix Toolset, InnoSetup
I'm pretty sure I'm the best option for your needs.