I'm not sure about life on an early Venus, but there sure is no life now, not with temperatures and pressures as they are today.
People often talk about SETI and attempting to find life in the universe, and, sending messages to the stars. Surely these people must know the Inverse Square Law, where quantity (in this case, RF energy) is inversely proportional to the square of the distance from the source. Whereby the energy of few thousand Watts of RF Energy into a dish with lets say 39dB of gain is proportional to a couple of mega-Watts EIRP. 1000 miles away this mega-Watt is but a few picowatts of RF energy. At 20 million miles, less than 100th of a femtowatt, then attowatts. This far too low a signal to pull out of the noise a signal from the background random radiation, even if your computer were looking for patterns in the noise floor.
The only reason that the earth can intercept the 20W signals from the Voyager probes (now out of the solar system), is the many dishes joined together to create the deep space network that is a dish the size of a small country; even then the data rate is in bits per second, and, so narrow the frequency set in the Hydrogen line (21cms (1420.4075MHz)). Then, even with cryogenic cooling of state-of-the-art Germanium diode detectors, the network can just discern Voyager's signals. Hey, and that is not even one light-year away, let alone 4.5 light-years to Proxima Centauri. The earth's signals just disappear into the noise, so low, that even a quantum computer could never discern the signal from random space noise that would have millions of times more energy. So, the Little Green Men would never know we were or are here. Oh, then there is the return signal (should there be a reply) taking millions of years at the speed of light, only to land on deaf ears. Humanity died out long ago. 73 de Tony