Chinese artificial intelligence start-up DeepSeek is embarking on what it calls an “unprecedented” hiring spree to overhaul backend systems severely strained by booming user demand and compute-heavy AI agents.Cui Tianyi, a former quantitative trading expert who joined DeepSeek in March to lead its Harness team, said on social media platform X on Monday evening that the Hangzhou-based company was seeking to recruit around 150 senior backend engineers.According to Cui, the push was driven by...