A person who seeks personal gain or benefits, often at the expense of others.

स्वार्थी व्यक्ति

English Usage: The self-seeker manipulated the situation to get the promotion.

Hindi Usage: स्वार्थी व्यक्ति ने स्थिति का फायदा उठाकर पदोन्नति प्राप्त की।