To help engineers maximize their career I tell Junior/Level 1 engineers focus on becoming net productive, meaning providing more value than you take.
Midlevel/Level 2 engineers should becoming independent and solving lot's of their problems on their own. As they approach the top of this level start getting involved in architecture and design.
Senior/level 3 should focus on helping the team to be successful as a whole, mentoring, producing value quickly when needed, and should be able to solve most problems independently including starting a project from scratch or solving complicated performance/technical problems.
Hiring and people problems are engineering manager problems.
Getting to know your coworkers is a good career move for anyone.