My development team needs a developer who's main focus is the stability and performance of the system. This is a role that I am filling by default and I like it. The issue is that I would like to convey what I do through my job title. Are there any titles out there that other teams are using? Or do you have any suggestions?
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Dude, if your project has enough bugs, and a high enough bug generation rate, that you need a full-time guy just to keep up with fixing them, then you have far bigger problems than what job title to put on your business card.
Traditionally, the title for a bug fixer is "Junior Programmer". Part of the progression from junior programmer to senior programmer is supposed to be an overall significant reduction in personal bug generation rates. Your brother devs on your project would appear not to have made that particular growth step yet.
Also note: Performance is a completely different issue from bug-fixing. The performance guy worries about algorithms (O(n log n) vs. O(n^3) for a bogosort). He worries about cache sizes. He worries about network bottlenecks, about the impact of putting a critical piece of the system on a server in Kathmandu with only a 300 baud serial line for connectivity.
This is not a main job title. The person would still be titled Developer, or Software Developer, or Software Engineer. Whatever your company labels programmers these days.
When a developer focuses mainly in a specialized area, then this becomes a sub-title.
For stability and performance you could call them a "Software Developer / Efficiency Expert", or "Software Developer / QA Support".