I've made this suggestion on the forums before, but it was promptly shunted to the "Feature Requests" section which hardly anyone ever looks at.
I'm making this post with the hope of getting more attention/input on this suggested feature, which I believe would be incredibly useful to all translators, especially those who work on Gengo regularly or on a full-time basis. Just yesterday, I had to scroll through my last 200+ completed jobs with only their first few characters visible to find a job I had done a few months ago for the same client so that I could keep the translation of some terms consistent.
(Well apparently, translators have been making this request since 2015 ._.)
First of all, thanks for your dedication in looking through completed jobs to help ensure consistency on a current job. Thanks also for your suggestion about creating a way to filter completed jobs by parameters such as customer ID. I've passed this feedback on to the team, who will be able to look into it if and when resources allow, but unfortunately we can't promise anything in this sense. In any case, we're grateful for you taking the time to share your thoughts with us, and we do encourage all of you to keep leaving feedback.
I hope this helps.