How about a natural heat pump?
You're right that the temperature is too high for life as we know it to exist. However look at humanity, we need 37 degree temperature yet can survive temperatures up into the 40s and 50s, and short bursts in saunas over 100 degrees. We do this using an active cooling system, we use the evaporation of water to cool us down when the environment gets too hot.
Theoretically the same water evaporating process could work on Venus, but liquid water wont be found and you need a steady supply to keep your temperature manageable. Evaporative cooling wont work on venus long term.
What can work is a heat pump. Similar to what's in your air conditioner and fridge, a bacteria could compress and expand a substance in order to transfer heat. Bacteria growing on the surface could pump heat from themselves into the surface in order to keep their internal temperature manageable.
Heat pumps have an effective range based on the substance they use. Heap pump appliances on earth loose efficiency at very high temperatures (my hot water system cant heat water if the outside temperature is over 48 degrees), however different substances, or a mix of them, could allow a heat pump to work on venus.
This is highly unlikely to evolve naturally, could be an interesting story point explaining who made it.
Current flowing through two conductors with differing properties can create a flow of heat too. This is used in camping / car fridges. If your bacteria has an external coating of two different conductors and a power source, it can transfer heat from itself outward.
While this is simpler than a heat pump, it's also highly unlikely to evolve naturally. Given the required materials are fairly exotic, it may not be able to reproduce.