What should I do when a senior engineer is underperforming but has strong historical reputation?

A long-tenured senior engineer is missing deadlines and pushing back on feedback, but others still see them as “solid.”

Start with evidence, not opinion. Separate reputation from current impact. Gather 2–3 recent, specific examples of missed outcomes (not effort). Then have a direct, private conversation focused on expectations and impact: “Here’s what I’m seeing, here’s why it matters, and here’s what good looks like.”

Avoid making it a character judgement. Keep it about observable behaviours and team outcomes. Ask what’s changed—capacity, motivation, clarity, or external factors. Often, senior engineers drift when scope becomes unclear or they feel under-utilised.

Agree a short, time-bound reset (2–4 weeks). Define 2–3 measurable commitments (e.g., deliver X by date, unblock Y, attend Z). Make success visible.

If they engage, support them—remove blockers, clarify priorities, give fast feedback. If they resist or deflect, escalate expectations: outline consequences and formalise a performance plan.

The key is consistency. Teams notice when reputation protects poor performance. You’re not correcting the past—you’re managing the present.

• Document 2–3 specific recent examples
• Set a clear expectations conversation (no ambiguity)
• Agree 2–3 measurable commitments for the next 2–4 weeks
• Schedule a midpoint and end check-in
• Decide upfront what happens if there’s no improvement

Avoid vague feedback like “needs to step up.” It creates debate instead of change.

Provides structured reflection prompts before the conversation, tracks commitments over time, and helps you review progress objectively without relying on memory.