I'd have to go with my first project that I wrote professionally that went beyond just enhancing someone else's code. The application, written in MASM and C, involved obtaining data from scales and other measuring devices and transferring it, via modem, to a central database. This was back in the pre-Internet era (1990), so the transfer was done over often unreliable 2400 to 9600 bps modem connections. The module sold for a whopping $9000 a pop (about 1/2 my annual salary at the time) plus annual maintenance.
The funny thing is that there's still demand for this kind of project, the only difference is that today it's going over the Internet to 'the cloud' and things like Arduino and Raspberry Pi are a lot more sophisticated than a simple serial interface.
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I'd have to go with my first project that I wrote professionally that went beyond just enhancing someone else's code. The application, written in MASM and C, involved obtaining data from scales and other measuring devices and transferring it, via modem, to a central database. This was back in the pre-Internet era (1990), so the transfer was done over often unreliable 2400 to 9600 bps modem connections. The module sold for a whopping $9000 a pop (about 1/2 my annual salary at the time) plus annual maintenance.
The funny thing is that there's still demand for this kind of project, the only difference is that today it's going over the Internet to 'the cloud' and things like Arduino and Raspberry Pi are a lot more sophisticated than a simple serial interface.