devtrackers.gg
| Name | Position | Start | Leave | Time at jagex |
|---|---|---|---|---|
| Acorn | Producer | 2018/8 | 2021/7 | 36 months |
| Alfred | Artist | 2014 | 2016 | 36 months |
| Day | QA Analyst | 2015/6 | 2015/8 | 3 months |
| Delta | Content developer | 2017/8 | 2017/10 | 3 months |
| Flippy | Content developer | 2019/8 | 2021/10 | 27 months |
| Gambit | Community Manager | 2018/8 | 2020/2 | 19 months |
| Gee | Artist | 2018/11 | 2021/4 | 30 months |
| Ghost | Artist | 2013/6 | 2020/1 | 80 months |
| Grimoire | Game Engineer | 2021/5 | 2021/8 | 4 months |
| Ian | Audio Developer | 1999 | 2021/3 | 267 months |
| Ian Gower | Game Engine developer | 2001 | 2016/10 | 190 months |
| Impact | Community Manager | 2018/9 | 2021/1 | 29 months |
| Jed | Content Developer | 2015 | 2018 | 36 months |
| Krista | Content Developer | 2010 | 2018 | 108 months |
| Mat K | Project Manager | 2005 | 2019/5 | 173 months |
| Maz | Training and Developer Lead | 2005/2 | 2019/10 | 177 months |
| Merchant | Community Manager | 2016 | 2017/3 | 15 months |
| MikeD | Product Director | 2019/11 | 2021/7 | 21 months |
| Munro | Content Developer | 2018/6 | 2019/2 | 9 months |
| Nexus | Content Developer | 2006 | 2018 | 156 months |
| Reach | Content Developer | 2010/9 | 2015/4 | 56 months |
| Ronan | Community Manager | 2014 | 2018/3 | 51 months |
| Stone | Product Marketing Manager | N/A | 2018/12 | Unknown |
| Sween | Community Manager | 2015/8 | 2021/10 | 75 months |
| TomH | QA Analyst | 2007 | 2018/2 | 134 months |
| Weath | Anti-Cheating Specialist | 2010/9 | 2020/9 | 121 months |
| Wolf | QA Analyst | 2014/1 | 2019/9 | 69 months |
| Zuko | Content Developer | 2020/12 | 2021/12 | 13 months |
Anyone with a year without a month I counted all 12 months. I might have messed up a few by adding or subtracting an extra month because I did them relatively fast. Positions are just based on what the wiki says some had multiple roles over time.
Most surprising person to me was Maz, didn't realize she had worked at Jagex for so long. Do what this data what you will.
edit: rearranged dates to be in year/month so that you can sort the start and leave columns as well if you wish.