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During final stages of testing upgraded version of core banking applications, we encountered a defect which required resolution from development team. After dev deployed the defect, I had very limited time to thoroughly retest and perform regression.

My task was to perform retesting and make sure there are no major defects after the release.

After resolution, based on my prior knowledge of the apps I grouped those testcases that had a potential impact to run automation regression to speed up the testing. While I manually tested the defects with some edge case scenarios. 

I kept the cross functional team updated about the testing progress and the risk involved if testing wasn't completed on time. 

But, I was able to mitigate the risk of not completing the testing on time and major risk of unexpected issues with the help to prior knowledge and proactive communication.

Thus, I learnt from this incident to carefully strategizing the situation and collaborative approach can help to mitigate risks.

When buildling the next generation instance, during the planning phase I budget the amount of servers we will launch the product with. Given each server cost was over 2 million dollar I biased to towards frugality and provided a bare minimum number of server we could launch with. But what I completely missed was during the developement some servers will end up in bad state and the engineering team will short of servers to test the software and firmware getting built which made meeting the project timeline riskly and heavily dependent on delivery schedules of servers and them staying healthy. This quickly became a bottleneck that I realized. I quickly put togther a plan to request adittional server and provide a detailed breakdown on where and how these would be used during and after developement. Synced with the hardware and ODM team and executives to get a approval and ordered the parts to get the servers and racks build at ODM.