www.jobs.ac.uk Academic jobs. Mostly in UK but also Ireland and further afield.
www.euro-math-soc.eu Academic jobs in Europe.
eims.ams.org American Mathematical Society.
jobs.siam.org SIAM, Society for Industrial and Applied Mathematics.
www.jobs.ie Try keywords like maths, mathematics or statistics.
www.efinancialcareers.ie Financial careers in Ireland and worldwide: banking jobs, accountancy jobs and IT recruitment.