I guess it depends on what type of soil you are going to be adding it to. You are making a very acidic compost, that could take years to break down, as both coffee grounds and sawdust are acidic in their own right. If you are adding it to really alkaline soil, typical of hot, desert type areas, it will probably be alright in the end. You may want to add in some garden lime to reduce the acidity of the mixture, and make it a little more habitable for earthworms, which require a more gently acidity usually from 6.2 to 7.0, which is neutral. I also suggest adding a few shovel fulls of your existing garden soil to it, to introduce the existing microbes to it, and get your composting process started. The dirt will also make it more friendly for the worms, again speeding up that composting process.
Is there some reason you are only using these two items for composting? Is it an experiment? Or do you have some organic lawn clippings, weeds, leaves, and so forth that you can add? These will all add carbon to the soil as they break down.
If you are looking for a plant-sourced nitrogen source, you might consider doing a cover crop like legumes of various types, hairy vetch, and the like. Allowing them to grow a few inches and then tilling them under adds plentiful organic matter and in the case of legumes, a great deal of nitrogen to the soil.
I'm attaching a link for you to check out, if you have not really heard of cover crops, or green manure before. It is fairly inexpensive and very envirofriendly. Good luck!
Cover Crops Seeds Green Manure, Nitrogen Fixers