If you are working for a large multinational company, your package should include membership of a corporate pension scheme. There are many providers, including the international banks, who offer personal pension schemes should you need to arrange to make additional contributions.
In order to protect your entitlement to the state pension in your home country, it is advisable to continue making payments to your home country's social security scheme for as long as possible. Many countries offer expatriated staff the opportunity to make voluntary contributions during their absence from the country.