The day I started my second FTSE 250 role in London I made every classic mistake. I tried to fix things on day three, I committed to deadlines I didn’t fully understand, and I didn’t ask enough questions because I was worried I’d look junior. By month four I was already in a “performance conversation.”
I rebuilt the next four months, kept the job, got promoted 14 months later. Then I learnt the actual playbook. Here it is.
Why do the first 90 days matter so much?
Three reasons:
- Reputational anchoring — people form a strong opinion of you in the first 4–6 weeks. That opinion is sticky.
- Trust capital — every yes and no you give in the first 90 days teaches colleagues whether you’re reliable.
- Learning curve — the questions you can ask freely at week 2 sound silly at week 12. Use the runway.
Days 1–30: Listen and learn
The biggest temptation is to “make an impact.” Resist it. Your job in month one is not to deliver — it’s to understand.
Goals for month 1
- Meet every direct stakeholder in a 30-minute 1:1
- Read every important document — strategy doc, last quarter’s OKRs, recent post-mortems
- Map the org politely — who decides what, who influences what
- Identify the 2-3 things your manager most wants to see in 90 days
The first 1:1 with your manager — template
1. What does a brilliant 90 days look like for someone in this role?
2. What are the 1-2 things that would worry you if you saw them in my first 90 days?
3. Who else do I absolutely need to spend time with in the first month?”
Take notes. Re-read them at day 30, 60, 90.
Days 31–60: Contribute on small things
Now you start producing. The rule: pick 2–3 small wins, not one big one. Small wins compound. Big bets at this stage are risky.
Goals for month 2
- Deliver 2-3 small but visible wins (a clean piece of analysis, a fix to a process, a useful summary)
- Start contributing in meetings — questions first, opinions second
- Find your “go-to person” in three teams outside your own
- Identify one specific thing you’d improve about how the team works (but don’t act on it yet)
Days 61–90: Propose direction
By day 60 you’ve earned the right to have opinions. Use it carefully.
Goals for month 3
- Take ownership of one substantial deliverable
- Propose one improvement to how the team operates (now you have evidence)
- Build your 90-day review document for your manager
- Set 12-month goals with your manager
The 90-day review document — template
Wins (3-5 bullets, quantified):
• [Outcome + impact]
• …
What I’ve learned about the team:
• [3-4 observations]
What I’d like more of in the next 90 days:
• [coaching, exposure, specific projects]
One question for you:
• [Specific question about my development or role]
Send it before your formal review. It pre-empties the conversation and shows ownership.
What are the 5 mistakes I see most often?
- Trying to fix things week one — the things that look broken often aren’t, you just don’t have context yet.
- Not asking enough questions — junior energy in month one is endearing; in month four it’s frustrating.
- Saying yes to everything — your reputation gets built on what you deliver, not what you commit to.
- Ignoring informal networks — every team has a “really knows how things work” person. Find them.
- Forgetting to document wins — three months in, you’ll have forgotten. Use the Sunday reset to capture them.
What if it’s a remote-first role?
Add 25% to every timeline — remote context-building is slower. Schedule deliberate “coffee chats” on Zoom (15 minutes, no agenda) with 8–10 colleagues in the first month. Over-communicate progress to your manager in writing. Default to camera-on.
UK vs US first-90-day culture
- UK: more emphasis on listening and understatement in month one. Visible self-promotion can backfire.
- US: more emphasis on early visibility and “quick wins.” Build a 30-60-90 plan and share it with your manager in week one.
Both work — just match the cultural register.
What if it’s going badly at day 30?
Talk to your manager directly. “I want to make sure I’m calibrating correctly. What’s one thing I should do more of, and one thing I should do less of?” Better to know at day 30 than day 70.
For more on the salary conversation after you’ve earned the right, see my pay rise negotiation guide.
Related reads
- How to negotiate a pay rise — scripts
- Master the STAR method
- The Sunday reset routine
- Imposter syndrome at work
FAQ
Should I bring up promotion in the first 90 days?
No. Bring up development: “What does the path from this role look like?” That signals ambition without overstepping.
What if my manager doesn’t do 1:1s?
Set one up yourself. “Could we book a 30-minute weekly check-in for my first 90 days?” — almost no manager says no to this.
How honest should I be about gaps in my knowledge?
Very. “I haven’t worked with [system] before — what’s the best way to get up to speed?” is a strength signal, not a weakness one.
Is it OK to push back on a deadline in month one?
Yes, with context. “I want to deliver this well — can I have until [date] instead of [date]? Here’s my plan.”
What if I realise the job is wrong for me?
Give it 90 days minimum. Most “wrong job” feelings are actually “new job overwhelm.” If it’s still wrong at day 90, then start planning your exit thoughtfully.