Well we don't actually use specialised issue tracker software, because our clients are kind of dumb and also our non programming co-worker. So we use a Google Drive Excel document to allow users to add issues, our boss review them, classify them and then give them to every programmer working on that project. Is slow, everyone forgets to put as solver the issue when they actually finish that particular issue and instead puts as solve all of their issue when they finish them all. Is kind of frustrating sometimes when two front-end or back-end are working on the issues.