An ordinary Bangladeshi passport needs a Singapore entry visa for an ordinary visit, even when its holder lives in Malaysia, the UAE or another country. The passport determines the visa requirement; the place of residence affects which filing procedure is available. Check a different travel document on its own terms before preparing Form 14A.
If you submit from Bangladesh, use the Singapore High Commission in Dhaka's current list of authorised visa agents; its procedure requires online submission through one of them. If you live elsewhere, check the Singapore Mission serving your place of residence. An eligible Singapore local contact or strategic partner may instead submit through ICA's e-Service. ICA lists a completed Form V39A for Bangladeshi applicants, so confirm the LOI signer and the permitted filing route before paying. The guide below explains the documents, Dhaka fees and timing.
Singapore visa from Bangladesh: Form 14A and LOI in Dhaka