Why am I getting no interview calls despite applying to many companies?
Almost always a screening problem rather than a skills problem. High-volume portal applications from service backgrounds are filtered on title, keywords and recent bullets, and a resume describing responsibilities instead of owned systems does not survive that filter. Fix the top third of the resume first, then move from portal applications to referrals. Volume without those two changes reliably produces the same result.
How do I ask a stranger on LinkedIn for a referral?
Send a short message that shows you read something specific about their team, states the role you are targeting, and describes one system you own in a single line. Attach the resume only if they ask for it. Do not send a paragraph about your job search or a generic request to be referred anywhere. Specific and short converts; long and generic gets ignored.
Should I take an intermediate company before a top product company?
Often yes. A mid-tier product company or a capability centre changes what your resume says about you and removes the screening objection entirely for the next move. Two switches over three years frequently reach a better outcome than eighteen months of rejected applications to companies that were never going to read the profile in its current form.
Does a certification help my resume get shortlisted?
Rarely on its own. Cloud or platform certifications can help when the target role explicitly asks for them, but they do not substitute for evidence of owned systems and they will not clear a data structures round. If your preparation hours are limited, spend them on coding depth and on rewriting your project bullets before you spend them on another certificate.