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, etc. 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.
Have also worked in projects before with RFID modules (13.56 MHz, NFC, Mifare, 125kHz, PN532 chip, etc.), as well as adafruit datalogger shields or similar (DS1307 RTC and SD card interface). Just not sure if I have worked and have the light and temperature sensors you are using in your project, but will not have problems in that part.
Regarding I2C communications, I have made at least 2 projects before with arduinos (among other microcontrollers) one acting as a master and others as slave devices (addressable sensor devices).
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.
Regards,
Carlos.