HR for Series A/B Startups: How to Build the People Function Before It Becomes a Crisis
You’ve raised Series A. Congratulations. You’re hiring. You’ve gone from 15 people to 40 in six months. Everyone’s excited. The product is working. The revenue is coming in.
Then the wheels start to come off.
Someone leaves without notice. You didn’t know they were unhappy. A top performer quits and takes two team members with her. You were caught off guard. A hiring manager uses language that gets flagged by your new legal advisor. You scramble to document that conversation.
These aren’t product problems. They’re people problems. And they’re expensive.
The worst part? They’re preventable. You just needed to build HR systems earlier.
Most founders think HR is something you hire for later. When you’re big enough. When it becomes a crisis. But by then, you’ve already built bad habits. You’ve already made hiring decisions without structure. You’ve already created a culture that’s hard to fix.
The best Series A and B companies are building people infrastructure now. Not waiting. Not hoping it goes well. Building.
Here’s what that actually looks like.
The Series A/B People Crisis: Why It Happens
You’re probably familiar with the pattern. You were a 15-person startup. Everyone knew each other. Culture was organic. Hiring was referrals. People left? You talked to them. Disagreements happened? You sat down and worked it out.
Then you scaled. You hit 40 people. Then 60. Then 100.
And suddenly the things that worked at 15 don’t work anymore.
You can’t know everyone. You can’t resolve all conflicts in a casual conversation. You can’t hire by referral only because you need 20 people but your referral network has 5. You can’t operate without systems.
But because you didn’t build systems when you were 15 to 40, you’re now scrambling to build them when you’re at 100. And by then, you’ve already created problems.
You’ve already hired people into vague roles. So now some people don’t know what they’re supposed to do. You’ve already made compensation decisions without logic. So now you’ve got pay gaps that don’t make sense. You’ve already promoted people based on “they’re senior” without defining what senior means. So now you’ve got reporting structures that don’t work.
The crisis isn’t that you need to hire an HR person. The crisis is that you’ve built the wrong foundation and now you’re trying to fix it while growing.
What Most Series A/B Companies Get Wrong
They Think HR is Hiring
Most founders understand HR as recruiting. You need people, so you recruit people. A CTO builds the tech hiring process. A CFO hires finance. And that’s HR.
But recruiting is 20% of HR. The other 80% is everything else: compensation, career development, performance management, culture, legal compliance, retention.
What happens when you only focus on recruiting? You get very good at hiring. But you get terrible at keeping people. You end up cycling through talent because the job they interview for isn’t the job they actually do. Or they’re not clear on how to advance. Or they feel underpaid compared to peers.
Then you’re constantly recruiting because you’re constantly losing people. And the best people? They leave first, because they have options.
They Delay Compensation Structure
One of the most common mistakes Series A founders make is deciding compensation on a case-by-case basis. You need a senior engineer. You offer what you think is right. The candidate negotiates. You agree.
Then you hire another senior engineer a month later. You offer them something different, for reasons that seem to make sense at the time (maybe they negotiated, maybe you had more funding, maybe one seemed more senior).
Now you have two senior engineers at different price points. For no good reason.
Multiply this across 40 hiring decisions over two years. You’ve got compensation that’s illogical, unfair, and creates resentment.
The fix is simple: define pay bands. Decide what each level pays. Stick to it. Negotiate within the band, not outside it. But most Series A companies don’t do this. They wait until Series B when they’re hiring their finance person and the new CFO creates a compensation audit and discovers the mess.
Then they’re adjusting compensation across the whole company, managing resentment, and doing expensive catch-ups.
They Build Culture by Accident, Not By Design
Culture at a 15-person company emerges naturally. It’s the personality of the founders and early employees. It’s how decisions get made. It’s what gets celebrated.
But when you grow, culture doesn’t scale by accident. You need to be intentional about it.
Most Series A companies don’t do this. They assume the culture will just carry forward. Then one day they realise they’ve hired people who don’t fit, and the original culture is diluting, and nobody’s aligned on what the company actually values.
The result? You’ve got a culture that’s neither cohesive nor intentional. It’s just whatever emerged from the chaos of hypergrowth.
They Don’t Define Roles and Responsibilities
You hire a VP of Product. But you never actually define what that person owns. What decisions are theirs? What requires approval? What are they measured on?
So they operate based on assumption. They make decisions the CEO would have made differently. Friction happens. They get frustrated that they’re not empowered. The CEO gets frustrated that they’re overstepping.
It’s completely preventable. You just need to write down: here’s what this role owns. Here’s the authority this person has. Here’s what success looks like.
But most Series A companies don’t do this. They figure it out as they go. Which means a lot of friction and wasted energy.
What Great Series A/B HR Looks Like (Without a Full HR Department)
Here’s the truth: you probably don’t need an HR person yet. You might be at 100 people and still not need a dedicated HR head.
But you need someone thinking about HR. Someone who’s building systems. Someone who’s asking the questions that prevent crises.
That person might be a founder. Might be a strong operations person. Might be a fractional CHRO working a few hours a week. But you need someone.
And here’s what they’re building:
System 1: Role Clarity and Career Paths
You define every role. Not just the job posting. The actual role. What does this person own? What decisions do they make alone? What decisions require input? What are they measured on?
Then you define career paths. What comes after this role? If I’m a Senior Engineer, what’s the next step? Is it a Staff Engineer track or a Manager track? What does each require?
You make this visible. Everyone knows what’s possible.
This solves so many problems. People know what they’re supposed to do. They know how to advance. There’s no ambiguity.
System 2: Compensation Transparency
You decide what each level pays. You set bands. You communicate them to the team (or at least to hiring managers).
New hires come in at the bottom of the band for their level. They can negotiate up, within the band. But no surprises. No secret deals. It’s transparent.
This prevents resentment and unfairness. It also prevents you from overpaying some people and underpaying others for no reason.
System 3: Structured Hiring Process
You write down how you hire. What are you looking for? What are the interview stages? What are you evaluating at each stage? What’s the decision process?
Then you follow it. Every hire. No exceptions.
This prevents bad hires. It prevents bias. It prevents hiring your friend’s roommate because they knew the right person to ask.
A structured process means you hire better people. And you hire more diverse people. Because bias happens in unstructured processes.
System 4: Stay Interviews, Not Just Exit Interviews
Every quarter, you sit down with your key people. Not a performance review. Not a one-on-one about projects. A real conversation: how are you doing? What’s working? What’s not? Do you see a future here?
You listen. You act on what you hear.
Most Series A companies do this never. They wait until someone gives notice to realise something’s wrong.
System 5: Performance Management Process
You don’t need something complicated. But you need something.
Every six months or annually, you review performance. You tell people what they’re doing well. You tell them what needs to change. You set goals for the next period.
This prevents surprises. It prevents firing someone for performance issues that they didn’t know were issues. It creates a common language for growth.
System 6: Communication Rhythms
You communicate regularly. All-hands meetings. One-on-ones. Team syncs. Written updates.
You’re transparent about business progress, financial health, changes. You’re honest about challenges.
This builds trust. This prevents rumours. This prevents people feeling left out.
Series A/B Specific: The Hiring Panic
Series A is when things get real. You’ve validated the product. You’ve got some revenue or strong investor confidence. Now you need to build a team.
But you’re not just hiring one person. You’re hiring 20. In six months.
Most founders panic. They hire whoever they can find. They compromise on culture fit. They overpay some people to close deals. They hire people who are good on interviews but not good at the actual job.
Then at Series B, you’re dealing with the fallout.
Here’s what great Series A hiring looks like:
First, you’re selective. You don’t hire just because you can. You’re thoughtful about who you bring in. You’d rather be understaffed with the right people than fully staffed with mixed people.
Second, you have a process. You know what you’re looking for. You evaluate consistently. You check references. You do trial projects if possible. You make sure the person can actually do the job, not just talk about it.
Third, you’re transparent about the role. You tell candidates what they’re actually going to be doing. What’s real. What’s aspirational. What’s broken. What needs fixing. You set expectations.
Fourth, you integrate thoughtfully. Your first month process is clear. Here’s who you report to. Here’s what success looks like. Here’s your onboarding.
The best Series A founders I’ve seen use this period to build right the first time. They know they might not hire 20 times again at this pace. So they do it well. They set themselves up for success.
The Fractional CHRO Model for Series A/B
You probably can’t hire a full-time HR director yet. But you can hire a fractional CHRO for a few hours a week.
What does that look like?
A fractional CHRO works with you to:
Build your people strategy. What are your hiring priorities? What’s your culture? What are your values? What does great look like? They help you get clear.
Design your systems. Compensation bands. Role definitions. Career paths. Hiring process. They design it with you.
Build your documentation. Your handbook. Your processes. Your policies. They write it so it’s clear and defensible.
Manage the legal stuff. Employment agreements. Offer letters. Policies that protect you. They make sure you’re not leaving yourself exposed.
Coach on tough conversations. Someone needs to be let go? Someone’s underperforming? Someone’s stepping on toes? They help you navigate it.
Hire at critical junctures. When you do hire your first VP, your first finance person, your first ops person, they help you get that right.
This costs 5,000 to 15,000 dollars a month, depending on scope. It’s cheaper than hiring someone full-time. It’s way cheaper than fixing the mess if you don’t do it.
What to Build Now (Series A) vs Later (Series B)
Not everything needs to happen at Series A. But some things do.
Build at Series A:
Role clarity for all key positions. Everyone should know what they own.
Compensation bands. Define what each level pays. Stick to it.
Structured hiring process. Document how you hire. Do it consistently.
Company handbook. Basic policies. What people need to know.
One-on-one cadence. Regular conversations with direct reports.
Core values definition. What does this company actually care about? Make it explicit.
Build at Series B (or when you hire a real HR person):
Detailed performance management system. Quarterly reviews with documentation.
Benefits program expansion. Health insurance, retirement, etc.
Compliance audit. Make sure you’re following employment laws.
Culture initiatives. Employee engagement surveys. Team building. Career development programs.
Talent management system. Where are your high performers? How are you developing them?
Succession planning. If key people leave, who’s ready to step up?
Common Series A/B Mistakes (And How to Avoid Them)
Mistake 1: Hiring Too Fast
You’re growing. You need people. You hire quickly. You hire sometimes-qualified people because they’re available.
Fix: Slow down. Quality over speed. One good hire is worth three mediocre ones. Take an extra two weeks to find the right person.
Mistake 2: Unclear Expectations
You hire someone for a role. They show up. You’re unclear on what success means. They do their job based on their interpretation. You expect something different.
Fix: Before someone starts, write down what success looks like. What are they measured on? What decisions do they own? What would get them fired? What would get them promoted?
Mistake 3: Comp Gaps
You hire person A at 120k. Six months later you hire person B for the same role at 140k because you had to compete or they negotiated better. Now person A finds out and resents you.
Fix: Set comp bands. Decide what each level pays. New hires can negotiate within the band. It’s fair. It’s predictable.
Mistake 4: No Culture Definition
You assume people understand your culture. Then you hire people who don’t fit. Then your original culture starts shifting. Then you’re not sure what you stand for anymore.
Fix: Define your values early. What does this company care about? How do we make decisions? What behaviours do we reward? What behaviours are deal-breakers? Make it explicit.
Mistake 5: No Feedback
You don’t tell people if they’re doing well or poorly. They assume everything’s fine. Then you’re frustrated with their performance. They have no idea you’re unhappy. When you finally say something, they’re blindsided.
Fix: Regular feedback. Both directions. Not just in annual reviews. Ongoing. “Here’s what you’re doing well. Here’s what needs to change.”
Mistake 6: No Retention Plan
You hire great people. You expect them to stay forever. But you never talk about their career path. You never ask what would make them want to stay. Then one day they leave.
Fix: Quarterly conversations. “Do you see a future here? What would make this better? What are you thinking about your next move?” Stay in front of it.
Build Now or Pay Later
Your Series A/B is the last time you can build culture intentionally. After this, you’re just managing what you’ve created.
You don’t need a big HR department. You don’t need a complicated system. But you need someone thinking about this. Someone building structure. Someone asking the right questions.
Role clarity. Compensation logic. Hiring process. Culture definition. Stay interviews. Feedback rhythm.
These aren’t optional. These are table stakes. And they’re much easier to build at 40 people than at 400.
Build now. Build right. Then you can scale without the crisis.
