It's all depends on which stage of your career. For a start, if you are looking for reviews of a particular organisation prior joining the firm, you may search for 'Glassdoor Singapore' (or even Linkedin) to check if there are any review. There are also HR accolades given to organisations that have good HR practices and organisational benefits. However the reviews and benefits doesn't mean paint the exact picture of your direct working environment and your supervisor. Also, everyone's perspective of a good workplace differs. It is better for you to list down what are the essentials. Generally, a good workplace shouldn't be a toxic environment and allow you to be empowered to carry out your duties. During interview, you may wish to ask questions concerning the working style of the team and your supervisor, the vision and values of the team / organisation, what is expected of you in this role and career progression. Only then, will give you glimspes to determine are you a good fit to the role and organisation.