I want you to think about how much money your startup is spending on HR tools right now. If you're like most of the companies I work with, you either have no idea or the number is going to make you uncomfortable for the wrong reasons. You're either spending too much on tools you barely use, or you're spending almost nothing and manually doing work that should have been automated six months ago. A 2024 Gartner survey found that only 24% of HR functions are actually maximizing the business value from their HR technology. Three out of four HR teams are paying for tools they're not getting full value from. In this newsletter, I'm going to walk you through what I call the minimum viable HR tech stack, the exact approach I use with my clients to figure out which tools they actually need, when they need them, and where every dollar of their HR tech budget should go at each stage of growth.
What "Minimum Viable" Actually Means
I need to define what I mean by minimum viable HR tech stack because most people interpret it wrong. They hear "minimum" and think "do as little as possible." Minimum viable means you have the smallest set of tools and processes that keep you legally compliant, operationally functional, and positioned to scale without having to rip everything out and start over.
Think of it like building a house. You don't need granite countertops when you're pouring the foundation. But you absolutely need the foundation to be solid, because everything else sits on top of it. The companies that get this wrong usually fall into one of two camps. The first camp spends almost nothing and does everything manually until something breaks, like running into a compliance issue or a key employee walking out because the onboarding experience was pure chaos. The second camp buys the most expensive tools on the market because someone at a Series C company recommended them, and then they wonder why they're paying twelve thousand dollars a year for features designed for a 500-person company when they have 40 employees.
Both approaches cost you more in the long run. The first one costs you in fire drills, legal exposure, and inefficiency. The second one costs you in wasted budget and tool fatigue, where your team stops using the systems because they're overkill for what you actually need. The goal is to match your HR infrastructure to your stage.
The Under 50 Stack
At this stage, your HR tech stack should be lean, affordable, and focused on three things: staying compliant, paying people correctly, and not losing critical information.
Payroll is non-negotiable from day one, and this is not the place to cut corners. Ever. Getting payroll wrong exposes you to tax penalties, employee lawsuits, and the kind of trust damage you cannot undo. I don't care if you have two employees. You need a proper payroll system that handles tax withholdings, filings, and direct deposits. Something like Gusto is going to serve you well at this stage. I've seen companies try to run payroll manually or through their accountant's software, and it almost always leads to tax filing errors that cost more to fix than the payroll tool would have cost in the first place.
A basic HRIS (your system of record for employee data) doesn't need to be a separate tool at this stage. Your payroll system can double as your HRIS. If you're using a PEO like Justworks or ADP, the HRIS that comes bundled is generally good enough. You don't need a standalone HRIS until you're past the 25 to 30 employee mark, and even then you may be able to push it further depending on your complexity.
An applicant tracking system. I know what some of you are thinking: "We only hire a few people a year, we don't need an ATS." Yes, you do. Even if you're hiring infrequently, you need a central place to track candidates, store resumes, and document your hiring decisions. This is partly about efficiency, but it's also about compliance. If someone ever challenges a hiring decision, you need to be able to show your process.
Document management for offer letters, NDAs, I-9s, tax forms, and employee handbooks. At this stage, a well-organized Google Drive folder with a clear naming convention and an e-signature tool is sufficient. Save your money here.
Workflow automation. Even at this stage, tools like Zapier or Make will save your HR person hours every week. Automating things like onboarding checklists, PTO notifications, and new hire account creation costs very little and frees your team to focus on work that actually requires a human brain. If you're the solo HR person at your startup, this is a lifesaver.
Total cost should be somewhere between $100 and $500 a month. If you're spending significantly more than that at this stage, you're overbuilt.
The 50 to 150 Stack
This is the stage where most companies realize their scrappy early setup is falling apart. Processes that worked when everyone sat in the same room simply don't scale when you have five or six teams across multiple time zones.
A standalone HRIS is now essential. You need proper org chart management, more sophisticated PTO policies, performance tracking, and a self-service portal where employees can update their own information without pinging HR for every little thing. I've seen HR teams at this size spend 30 to 40% of their time answering routine questions that a self-service system handles automatically. Tools like BambooHR or Rippling start to make sense here. I'm also watching a new wave of AI-native HRIS platforms like Shapes and Leapsome that are building intelligence directly into the core system rather than bolting it on as an afterthought.
Your ATS needs to grow up. When you're hiring consistently, you need proper pipeline management, interview scorecards, and scheduling automation. The cost of a bad hire ranges from 50% to 200% or more of that person's annual salary when you factor in lost productivity, replacement costs, and team disruption. If a better ATS helps you make even a few smarter hiring decisions per year, it has already paid for itself. Greenhouse is the industry leader for a reason. Ashby is another one I've been watching closely. And once you have the right ATS, make sure you're pairing it with a structured interview framework that actually predicts success.
A performance management system. At this size, informal check-ins and a Google Doc create massive inconsistency. Different managers are evaluating people against different standards, feedback is happening sporadically, and you have no data to support compensation or promotion decisions. One tool I've been keeping an eye on here is Opre, which takes an AI-native approach focused on continuous feedback and real-time insights rather than the traditional annual review cycle.
A learning management system is worth considering if your business requires compliance training or if you're onboarding more than a few people per month. Before you invest in a full LMS though, ask yourself whether a well-organized Notion workspace or a series of Loom videos would accomplish the same thing. For many companies at the lower end of this range, the answer is yes.
Analytics capability. At this size, you should be tracking turnover rates, time-to-hire, offer acceptance rates, and compensation benchmarks. If you can't pull these numbers quickly, you're making people decisions blind.
This stack is going to run you somewhere between $2,000 and $5,000 a month. SHRM puts the average cost per hire at $4,700. If your stack helps you avoid even two or three bad hires per year, the tools have already paid for themselves.
The 150 to 300 Stack
When you cross the 150 employee mark, the game changes. You're no longer a startup figuring things out. You're a scaling company, and your HR infrastructure needs to reflect that. The biggest shift is that your HR team needs to be making data-driven strategic decisions, and your tools need to support that.
Your HRIS needs to be doing serious work. You need robust workflow automation built into the system itself, not just Zapier connections on top of it. Automated approval chains for promotions, compensation changes, and role transitions. Proper onboarding and offboarding workflows that touch every system in your stack automatically.
A dedicated compensation management tool. At 50 employees, you could get away with a spreadsheet and some market data. At 150 to 300, that approach becomes dangerous. You need a system that helps you maintain pay bands, run compensation reviews, benchmark against the market, and identify pay equity issues before they turn into legal exposure or resignations. This is also the stage where your workforce planning needs to be tightly connected to your compensation strategy.
Analytics beyond basic reporting. You need engagement surveys, sentiment tracking over time, and connections between people data and business outcomes. Your VP of People should be walking into leadership meetings with data. If your tools can't produce that data without someone spending two days in Excel, you need better tools.
A proper L&D platform. Not just for compliance training, but for manager development, leadership pipelines, and career pathing. At this size, you likely have new managers who've never managed before, and the cost of leaving them untrained shows up in your engagement scores and turnover numbers.
Compliance automation becomes critical. Depending on your industry and the states or countries you operate in, you're now dealing with a complex web of regulatory requirements. Tools that automate compliance tracking, manage required training certifications, and flag upcoming deadlines will save you from mistakes that come with real financial penalties.
The 300 to 500 Stack
At this size, your HR stack is no longer just supporting the business. It's a strategic system that directly impacts your ability to execute.
A full Human Capital Management platform becomes almost unavoidable. You need a unified system that connects HRIS, payroll, benefits administration, time tracking, and workforce management in one place. Running five or six point solutions that each handle one piece creates too much operational risk. When you have 300 people, a missed integration or broken sync between systems becomes a compliance risk and data integrity problem.
Workforce planning becomes a standalone function. You're making decisions about headcount budgets, organizational design, and capacity planning that directly affect your burn rate. You need tools that let you model scenarios, track headcount against plan in real time, and flag when departments are drifting from their approved hiring budgets.
Enterprise-grade recruiting tools. Your ATS should be handling high-volume pipeline management, automated sourcing workflows, offer approval chains, and deep analytics on every stage of your funnel. At this stage, you're competing for talent against companies that have this infrastructure, so you can't afford to be slower or less coordinated.
Succession planning and talent management. At 300+ employees, losing a key leader without a plan creates real disruption. You need to identify high-potential employees, build development plans, and track readiness for critical roles.
Security and compliance at scale. You're holding sensitive personal information for hundreds of people. You need proper access controls, audit trails, and data retention policies. If you're operating internationally, you're dealing with GDPR, local labor laws, and cross-border data transfer requirements.
The Most Common Tool Mistakes
Let me walk you through the mistakes I see over and over, because they're almost always preventable.
Buying tools before defining your processes. A tool doesn't fix a broken process; it just makes a broken process happen faster. If you skip the process design and go straight to the tool, you end up with expensive software that nobody uses correctly. These are the kinds of mistakes that kill startups early.
Tool sprawl. Seven or eight different tools that each handle one small piece of the HR puzzle and none of them talk to each other. I worked with a retail company that had exactly this problem. They had subscriptions for tools with overlapping functionality, and the HR team was spending more time managing the tools than doing actual HR work.
Ignoring integration. Can your ATS push new hire data into your HRIS? Can your HRIS sync with your payroll? At 30 employees, manual data entry between systems is annoying. At 200, it's a full-time job.
Not measuring utilization. If you're paying for a performance management tool and only 40% of your managers are completing reviews in the system, you have an adoption problem. Companies with structured change management see 85-90% adoption rates compared to 60-65% for those without.
Building for the company you want to be instead of the company you are. I've watched companies spend $50,000 a year on an HR tech stack built for a 500-person company when they had 30 employees. Build for your current stage, and trust that a well-chosen stack can grow with you.
Bringing It All Together
Your HR tech stack should match your stage. Under 50 employees, keep it lean with payroll, a basic system of record, a simple ATS, and organized document storage. At 50 to 150, invest in a standalone HRIS, a robust ATS, performance management, and start building your analytics muscle. At 150 to 300, you need compensation management, engagement tools, a real L&D platform, and compliance automation. And at 300 to 500, consolidate into a full HCM platform, add workforce planning, succession management, and enterprise-grade security.
At every stage, invest in automation and integration because those are what turn a collection of tools into an actual system. Define your processes before you buy the tools, measure utilization after you deploy them, and resist the urge to overbuild for a stage you haven't reached yet.
Here are the action items I'd prioritize if you're a scaling startup evaluating your HR tech stack right now:
- Audit your current tools against the stage framework above. Write down every HR tool you're paying for, what it actually does, and whether your team is using it to its full capacity. If utilization is below 60%, you have a training problem or you bought the wrong tool.
- Map your processes before you shop for software. For each core HR function (payroll, hiring, onboarding, performance, compliance), document how the process works today and where the manual bottlenecks are. Buy tools that automate what's already working, not tools that force you to invent a new process.
- Check your integrations. Can data flow between your core systems without someone manually re-entering it? If not, prioritize closing those gaps before adding any new tools to the stack.
If you're building HR at your startup for the first time, start with the under-50 stack and resist the temptation to skip ahead. You can always add tools. Unwinding a bloated stack is much harder.
