Book · 2003
The First 90 Days
by Michael D. Watkins
A leadership playbook for the first three months at a new job, built around reading the room before trying to change it.
What does Reddit think of The First 90 Days?
Twenty-one mentions across five subreddits over seven years, with r/ExperiencedDevs driving 12 of them — that's a quiet but consistent signal. The book gets recommended almost reflexively whenever someone asks how to start a new engineering or management role. The ↑68 recommendation on r/ExperiencedDevs buries the lede: the commenter tells you to take notes on every conversation, and adds the book as supporting evidence rather than the whole answer. That framing repeats. One commenter (↑60) calls it useful specifically for "reading the room," and notes that professionalized managers recognize the framework on sight — a shared language argument. The ↑25 comment acknowledges the leadership slant directly: mostly geared towards leadership adjustment, but useful even for individual contributors. Sentiment is broadly positive but not effusive. r/sysadmin and r/datascience each logged one neutral mention with no further engagement. Nobody on Reddit argues against it. Seven mentions in 2020 is the high-water mark; 2024 produced one.
Community feedback & reader fit
Themes
- · Onboarding strategy for new roles
- · Reading organizational culture before acting
- · Building credibility in the first weeks
- · Leadership transition frameworks
- · Stakeholder communication and alignment
Common praise
- + The 'read the room' framing gives new hires a mental model that actually changes how they spend week one.
- + Managers who've read it recognize the vocabulary, which makes it a useful shared reference in leadership circles.
- + Individual contributors pull value from it even though the book is pitched at leaders and executives.
- + r/ExperiencedDevs recommends it often enough that it reads as a default answer to new-job anxiety threads.
Common criticism
- − The leadership-transition angle means IC readers have to translate actively — the book doesn't do that work for you.
- − Neutral reception on r/sysadmin and r/datascience suggests it doesn't travel well outside software engineering and management.
- − 21 total mentions in 7 years is a modest footprint for a book that gets called a classic; it circulates, it doesn't dominate.
Who it's for
Starting a management or senior IC role and want a framework before day one? This is the book most r/ExperiencedDevs veterans will already have on their shelf. It rewards readers who are about to inherit a team or budget more than those shipping features from the start. Purely operational roles on r/sysadmin got little from it. The book works best when your first 90 days involve persuading people rather than just building things.
Mentions over time
Top subreddits
Which Reddit comments matter for The First 90 Days?
Top-upvoted quotes across the subreddits where this book is mentioned. Click through to read the full thread.
“Would definitely recommend giving The First 90 Days a read, but if you read nothing else in this post remember this: Take notes about everything and every conversation you have early, and what your impressions are. This founda…
“Not the commenter suggesting "The First 90 Days", but +1ing it. The book helped me understand how to read the room in a new job. It's also fairly well-known by professionalized managers/execs, so it's something that can be referenced as well.
“Checkout the book The First 90 Days if you are looking for more structure to your approach.
“Congratulations! Such a good question. Here are some things that immediately come to mind: * Get to know your manager. Ask about their preferred communication styles (e.g., do they prefer email, face-to-face chats, Slack, etc.). How often would they like updates about your work? * After you settle …
“> I spent my first weeks to read codebase and write all the issues and inconsistency. Sounds like you spent a lot more time talking about something you don't quite understand or know, rather than listening and learning. I understand you want to come in strong and start showing value, but you have …
“I would also recommend a book for you. This one is great and I’ve been at several top tier companies that have trainings built on some of the concepts. First 90 Days
“There’s a pretty good book called The First 90 Days. Add it to your reading list. The First 90 Days: Proven Strategies for Getting Up to Speed Faster and Smarter, Updated and Expanded
“The First 90 Days, can’t recommend the book enough. It’s mostly geared towards leadership adjustment, but I’ve taken away great things being just a dev.
Convinced? Pick up The First 90 Days
What else does r/ExperiencedDevs read?
Other books mentioned in the same sub, ranked. Shared-sub overlap with this title breaks ties.
Designing Data-Intensive Applications
Martin Kleppmann
A backend engineer's field guide to the tradeoffs behind every database, queue, and distributed system you will ever touch.
The Pragmatic Programmer
Andy Hunt
Two veterans hand you a checklist for the craft: don't write code you don't need, own your tools, and fix the broken window before someone else does.
The Mythical Man-Month
Frederick P. Brooks Jr.
Fred Brooks spent the 1960s building IBM's OS/360 and wrote down everything that went wrong — in 1975, and it still lands.
A Philosophy of Software Design
John Ousterhout
A Stanford professor's 200-page rebuttal to Clean Code, built on interface depth rather than method length.
The Manager's Path
Camille Fournier
A software engineer picks up a management role and finds out — via 142 Reddit mentions — that nobody told them about the crying, the firings, or the 90-day onboarding clock.
The Phoenix Project
Gene Kim
An IT manager inherits a failing project, a mutinous ops team, and a CEO deadline — and has to ship before the company does.
The First 90 Days — frequently asked
What does Reddit actually think of The First 90 Days?+
Broadly positive, but quiet. The typical Reddit take is a terse recommendation — 'checkout this book if you want structure' — rather than a detailed defence. Nobody argues against it.
Is The First 90 Days useful if you're not a manager?+
Depends how political your role is. One ↑25 commenter on r/ExperiencedDevs says they took away useful things as 'just a dev,' but acknowledges the book targets leadership transitions. If your first 90 days involve stakeholder reads and political capital, yes. If you're joining to write code in a quiet corner, probably not.
Which subreddits recommend The First 90 Days most?+
r/ExperiencedDevs by a wide margin — 12 of the 21 total mentions. r/cscareerquestions added 6, mostly in the 2020 window. r/sysadmin, r/datascience, and r/Entrepreneur each contributed one neutral mention that went nowhere. It's essentially an r/ExperiencedDevs book.
Should I read The First 90 Days before starting a new job?+
Yes, if the job has any leadership or influence dimension. The ↑68 comment on r/ExperiencedDevs recommends it but frames the actual lesson as 'take notes on everything and every conversation early' — the book supplies the structure around that instinct. Give yourself a week before start date so the framework is in your head before you walk in.