In Part I of this series, we talked about the first question every graduate student should ask before pursuing a postdoc: Do you actually need one? If you worked through that post and landed on ‘yes,’ welcome back. This one is for you — because knowing how to choose the right postdoc is just as important as deciding you need one.

Here’s the thing: deciding you need a postdoc is only the beginning. The next question, “Which postdoc?”, matters just as much, if not more.

I’ve worked with postdocs whose training experience was everything it was supposed to be: a mentor invested in their development, a collegial and energizing lab, and a clear line of sight from where they were to where they wanted to go. And I’ve worked with postdocs on the other end of that spectrum—people who are talented, hardworking, and quietly stuck in a situation they never fully vetted before saying yes.

More often than not, the difference comes down to the vetting process—or the lack of one.

Reframe the Process: This Is a Two-Way Interview

One of the most important mindset shifts I encourage graduate students to make is this: when you’re exploring a postdoc opportunity, you are not auditioning. You are interviewing.

Yes, the PI is evaluating you. But you are also evaluating them, the lab, the environment, and whether this opportunity aligns with your professional development needs and personal non-negotiables. Walking into that conversation with that clarity—I am here to gather information, not to impress my way into any opportunity at any cost—will change how you show up and what you walk away knowing.

So what should you be gathering information about? Three things: career fit, mentorship, and environment.

How to Choose the Right Postdoc: Three Pillars of Fit

1. Career Fit: Will This Postdoc Build What You Actually Need?

Go back to the questions from Part I: What skills do you still need to develop? What does your target career path require? Now use those answers to evaluate whether this opportunity delivers.

Questions to ask the PI:

• What are the funding expectations for postdocs in your lab? Will I be expected to apply for my own funding, and if so, within what timeline?
• Are there opportunities for collaboration with other labs or researchers—within the institution and beyond?
• Will there be support and encouragement to attend conferences and present my work?
• Is there an opportunity to be involved in grant writing? What does that support look like in practice?

And don’t stop there. Ask about additional resources available to you—not just within the lab, but across the institution. A well-established postdoc office, for example, can meaningfully improve your overall training experience.

2. Mentorship: What Kind of PI Are You Signing Up For?

The PI relationship is arguably the most influential factor in a postdoc’s experience. A strong mentor can open doors you didn’t know existed. A weak or indifferent one can cost you years.

The challenge is that most PIs know how to present well in an interview. That’s why you need to ask questions that go beyond the surface—and then verify the answers yourself.

Questions to ask the PI:

• How often do you meet individually with postdocs—and what do those meetings typically focus on?
• How often do you meet to discuss topics outside of the project itself—things like professional development, career direction, or critical feedback?
• How involved are you with the day-to-day work of your postdocs? How do you prefer to communicate between meetings?
• Where have some of your most recent postdocs gone after leaving your lab?

That last question is one of the most telling you can ask. A PI who is proud of their mentorship record will answer it easily and enthusiastically. Hesitation, vagueness, or a sudden pivot in the conversation is information.

3. Environment: What Is It Like to Work Here?

Lab culture is notoriously hard to assess from the outside—which is why you need to go beyond the PI conversation. Ask to speak with current lab members, especially other postdocs. They will tell you things the PI won’t.

Questions to ask current lab members:

• How accessible is the PI when you have questions or need guidance?
• How would you describe the dynamic among lab members? Is collaboration encouraged, or does it feel more competitive?
• What does a typical week look like for you? Are there clear expectations around hours and workload?
• How large is the lab, and what is the ratio of postdocs to graduate students? Does that dynamic work well?
• What are the core facilities like, particularly if your work involves complex analyses such as imaging or histology?

Pay attention not just to what people say, but to how they say it. Enthusiasm is telling. So is a careful pause before answering a straightforward question.

Red Flags: What to Watch For Before You Say Yes

A lot of what I’ve learned about postdoc red flags comes from sitting across from postdocs who, in hindsight, can see exactly where the warning signs were. They just didn’t know what to look for at the time. Here are a few of the most common ones.

The mentorship gap that never gets discussed

If you never asked the PI how often they meet with postdocs to discuss professional development—and never verified the answer with current lab members—you may not discover the gap until you’re already in it. This is one of the most common “in hindsight” regrets I hear. Ask directly, ask more than once, and ask more than one person.

When everything sounds too good to be true

Counterintuitively, a PI who promises everything—complete freedom to pursue any project you want, unlimited time for professional development, a perfectly balanced and supportive lab culture—can be a red flag. Not because those things are impossible, but because they are rare, and because overpromising during recruitment can signal that the reality on the ground looks quite different. Ask for specifics. “How does that work in practice?” is one of the most useful follow-up questions in your arsenal.

A lab where everyone is in the same precarious position

If you notice that the lab’s postdocs are exclusively—or disproportionately—in positions of limited mobility, such as visa-dependent status, it’s worth asking why. Some PIs, consciously or unconsciously, gravitate toward situations in which postdocs have limited ability to push back, set boundaries, or leave. The concern here isn’t about the people in those positions—it’s about the power dynamic the PI may be cultivating. Watch for whether the lab members seem to be there by genuine choice, or whether circumstances prevent them from pursuing other opportunities.

You Have More Agency Than You Think

Choosing a postdoc is one of the most consequential professional decisions you’ll make—and you are allowed to approach it like one. That means asking hard questions, taking the answers seriously, and walking away from opportunities that don’t align with your goals or needs, even when the lab is attached to an impressive name.

The postdocs I’ve watched thrive didn’t just find a good opportunity. They chose one—deliberately, with clear criteria, and with a willingness to keep looking until they found the right fit. That is the difference between hoping for a good outcome and making one happen.

You can do the same. Choose with intention.

If this resonated, you might also find helpful:

• “Do You Actually Need a Postdoc? A PhD Career Coach’s Honest Answer” — Part I of this series
• “How to Network with Intention” — for building the connections that help you vet opportunities before you apply
• “3 Questions to Ask During Your Next Job Interview” — the two-way interview mindset applies here too