Is it permissible to work as an accountant or in any administrative capacity for the Parliament in a Muslim country?

Working in a parliamentary council is, in principle, not forbidden. Since parliamentary work falls under the rubric of Islamic political jurisprudence, which relies on the understanding of benefits and harms, if its good outweighs its evil, it is permissible. If its evil outweighs its good, then it is prohibited. This varies from one country to another, and the matter is referred to the scholars of each country.