E4-assistant engineer (for diploma holder entry)
E5-engineer (for degree holder entry)
E6-senior engineer
M1-assistant principal engineer
M2-assistant principal engineer
M3-principal engineer
M4-senior principal engineer
M5-deputy chief engineer
M6-chief engineer

Technical role for above.

E4-assistant engineer (for diploma holder entry)
E5-engineer (for degree holder entry)
E6-senior engineer
M1-assistant manager
M2-assistant manager
M3-manager
M4-senior manager
M5-director/deputy general manager/general manager
M6-general manager

Managerial role above.