High Court of Sikkim Recruitment 2017 Oil and Natural Gas Corporation Limited – ONGC Recruitment 2017 for System Officer, total 03 Vacancies. Address: NH-31A, Sungava,, Gangtok, Sikkim 737101 Job Details for System Officer Post Name: System Officer Total No. of Posts: 03 Job Location: Gangtok (Sikkim) Pay Scale: Rs.9300-34800/- Grade Pay : Rs.4200/- Educational Qualification and Eligibility