Hi,
I have experience for 15+ years in electronics/embedded development. I have several years of advanced AVR/arduino development, including library development from scratch. Practically all Arduino AVR boards used, like: 2009, 2010, UNO, MEGA, NANO, MICRO, MINI and others like DigiSpark (attiny85). Several shields used like Ethernet (W5100, ENC28J60, etc.) with various IP protocols implementation, various graphical TFTs with and without touchscreen and various BUS types (parallel, SPI, I2C, etc.), all kinds of sensors and buses, serial and parallel memories, etc.
I have worked with ESP8266 wifi modules as a way to provide arduinos with internet connectivity and have used several protocols to upload data to cloud services, as well as get commands from the cloud servers.
I would need to know what you intend to "parse" from that JSON (large) file into the serial monitor - if it's only getting specific data from each record, etc.
I also don't quite understand what you mean by "how you plan to debug" - is this because the serial port will already be used for dumping parsed data ? If this is the case, I can always use an arduino MEGA that has 4 hardware UARTs and then switch back to the Uno when finished, or can use extra serial ports implemented in software on the Uno.
If you are interested in my bid, please let me know some more details about your project and I'll be able to answer you back telling if I'm up to the task or not. Feel free to contact me.
Best regards,
Carlos