By Lars Mucklejohn Major investment banks have cut their number of UK job vacancies in half over the last year as a dealmaking slump puts a strain on recruitment and bonuses. Analysis of job openings at Citigroup, Barclays, JP Morgan, Morgan Stanley and HSBC found that vacancies had plunged 50 per cent on average, according to the website Vacancysoft. Citi saw a 75 per cent drop in hiring – the largest proportion of the group – as it posted 956 openings last year compared to 3,865 in 2022. Barclays reduced vacancies by around half at 3,458 from 7,435, while JP Morgan posted 2,864 openings from…