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.
It's been a while since I last used a Particle Photon, but I have one for development and delivered several projects before with it. I can easily get your project complete, make a video demo with DHT11 sensor working that you can replicate and provide any assistance you may need to get it working on your side.
If you are interested in my bid, feel free to contact me.
Regards,
Carlos.