There are following technical posts available in Indian Navy:

Engineering General Service Officer
Submarine Engineer Officer
Naval Construction Officer

Eligibility for these posts:

Entry: NDA
Gender: Male Only
Age: 16 ½ - 19 Years
Qualification: 10+2 with Science (Physics, Chemistry and Mathematics)

Entry: 10+2 (B.Tech)
Gender: Male only
Age: 17 to 19 ½ Years
Qualification: 10+2 with Science Stream with minimum 70% marks (Physics, Chemistry and Mathematics)

Entry: Engineering (General Service - E)
Gender: Male Only
Age: 19 ½ - 5 Years
Qualification: Completed B.E / B.Tech Degree with minimum 60% marks in one of following disciplines:
Marine
Mechanical
Aeronautical
Production
Metallurgy
Control

Entry: Submarine (Engineering)
Gender: Male Only
Age: 19 ½ - 5 Years
Qualification: Completed B.E / B.Tech Degree with minimum 55% marks in one of following disciplines:
Mechanical
Electrical / Electronics
Telecommunication
Computer Science
Control Engineering

Indian Navy Technical Post Recruitment