Preheat the oven to 350 degrees Fahrenheit and line an 8-inch springform cake pan with a circle of parchment paper.
In a large bowl, whisk together the avocado oil, pure maple syrup, eggs, lemon juice, lemon zest, and vanilla extract until everything is well-combined.
In a separate bowl, stir together the dry ingredients (almond flour, tapioca flour, baking powder, and salt) until combined.
Transfer the dry ingredients to the bowl with the wet ingredients and mix well until a smooth batter forms.
Pour the cake batter into the prepared pan and cover it with foil (this will prevent the top of the cake from getting darker than golden brown). Bake for 30 minutes with the foil on, then remove the foil and bake for another 15 to 25 minutes, or until the cake tests clean.
Allow the cake to cool completely before releasing it from the cake pan.