Hiring your first engineer at Seed or Series A? Learn what matters, what to pay, and how to spot a mis-hire before it costs you a year of runway.
Your First Engineer Writes the Code Every Future Hire Inherits
Most founders treat their first engineering hire like any other hire. Write a job spec. Post it. Interview a few people. Pick the strongest CV.
It’s the most expensive mistake an early-stage founder makes.
Your founding engineer sets the architecture, the pace and the standards your team will live with for years. Brian Chesky put it best when describing Airbnb’s early hiring: “bringing in your first engineer is like bringing in a DNA chip to the company.”
The stakes are higher now than a few years ago. Carta data shows Series A companies now average 16 employees, down from 25 a few years ago. Smaller teams mean every early hire carries more weight. One wrong person in a team of eight is not a small problem. It’s an eighth of your company.
In healthtech, the stakes rise again. Your first engineer makes decisions about patient data, access controls and integrations before you have a security lead, a compliance function or a second opinion in the room.
This guide covers:
- Why most founders hire the wrong founding engineer
- The five things which matter most, in order
- A step-by-step process to run the search
- What to pay in cash and equity
- The red flags of a mis-hire, and how to spot them early
Why Most Founders Get This Hire Wrong
Here’s the pattern. A founder raises a seed round and starts hiring. They screen for the signals a Series B company screens for:
- Big-company logos on the CV
- Deep specialism in one language or framework
- Polished system design answers
- Years of experience in a defined role
None of these predict success at Seed.
A Series B engineer works inside structure. There’s a roadmap, a product manager, a team lead, code review and an on-call rotation. Their job is to execute well inside a system someone else built.
A founding engineer has none of this. No spec. No team. No playbook. Their job is to build the system.
These are different jobs. They need different people.
The engineer who thrives at a 500-person company often struggles at a five-person one. Not because they lack skill. Because they’ve never had to decide what to build, with nobody to check the decision.
The reverse holds too. The best founding engineers often look messy on paper. Short stints at failed startups. Side projects instead of promotions. A CV full of things they built, not titles they held.
In healthtech, this mistake costs more. Early technical decisions sit on top of HIPAA, patient data and EHR integrations. A founding engineer who over-builds wastes runway. One who under-builds on security creates a problem your first enterprise customer will find in their security review. Both are expensive to undo.
What Matters Most, in Order
Use this list to score every candidate. The order matters. A candidate who scores high on number five but low on number one is the wrong hire.
1. Trust alignment with the founders
Can they disagree with you productively? Your founding engineer will tell you a feature is a bad idea, a deadline is unrealistic or your architecture plan won’t scale. You need someone who says this clearly and early. You also need someone who commits once a decision is made.
Test it in the interview. Present a technical decision you’ve already made and ask what they’d change. Watch whether they push back with reasons or nod along.
2. Comfort with total ambiguity
No spec. No team. No defined priorities. The best founding engineers find this energising. Everyone else finds it stressful within three months.
Ask candidates to describe the most undefined project they’ve worked on. Listen for whether they shaped the problem themselves or waited for someone to define it.
3. Range over depth
Early on, your engineer will build the backend, fix the frontend, set up infrastructure, write the integration and handle the production incident at 2am. Breadth beats mastery at this stage.
Deep specialists become valuable later. At Seed, they often get stuck on the parts of the job outside their speciality.
4. Equity and risk appetite match
Someone who needs certainty will burn out or leave within a year. Your founding engineer is underwriting your credibility as a founder. They need to understand the risk and want it anyway.
Be direct about runway, burn and what happens if the next round doesn’t close. Candidates who flinch at these conversations are telling you something.
5. Judgement for “good enough, for now”
The hardest skill to find. Knowing what to build properly and what to build fast and ugly. A founding engineer who builds everything for scale burns months on problems you won’t have for two years. One who builds everything fast creates debt nobody can pay down.
Ask: “Tell me about something you deliberately built badly. Why, and what happened next?” Strong candidates have a clear answer.
How to Run the Hiring Process, Step by Step
Step 1: Define the 12-month problem before writing a job spec
Skip the skills list. Start with one question: what does this person need to have built in 12 months for the company to be in a strong position?
Write the answer in one or two sentences. Examples:
- “Ship a HIPAA-compliant MVP integrated with one EHR and live with three pilot clinics.”
- “Rebuild the prototype into a production platform able to pass an enterprise security review.”
Your job spec, interview questions and scorecard all come from this sentence.
Step 2: Source from your network first, then go passive
The best founding engineers are rarely applying. They’re employed, often happily, and only move for the right founder and the right problem.
Start with people you or your investors have worked with. Then move to direct outreach. a16z’s guidance on founding teams makes the same point: most founders start with their immediate network of former colleagues and trusted peers, and it’s a solid first step. Job boards come last, if at all.
Step 3: Interview for ambiguity, not trivia
Algorithm puzzles tell you little about a founding engineer. Use exercises close to the real job:
- Give them a vague product brief and ask them to scope the first version
- Ask them to walk through an architecture decision they’d make in week one, and what they’d defer
- Pair with them on a real problem from your codebase
You’re testing judgement, communication and range. Not memory.
Step 4: Use references to test risk appetite and ownership
Ask references specific questions:
- “Tell me about a time they made a call without being asked.”
- “How did they behave when the company’s direction changed?”
- “Would you hire them as your first engineer? Why or why not?”
The last question is the most revealing. Hesitation matters.
Step 5: Decide fast
Strong founding engineer candidates weigh several early-stage offers at once. A slow process signals a slow company. Set your decision timeline before the first interview and stick to it. A final decision within 48 hours of the last interview is a good standard.
What to Pay a Founding Engineer
Founders often get this wrong in both directions. Too little equity and strong candidates walk. Too much and you run short for the hires who follow.
Equity benchmarks
Carta data shows the median equity granted to the first engineer at a tech startup over a two-year window was 1.54%. The drop-off after the first hire is steep: the median falls to 0.61% after only two more hires.
Engineering dominates early hiring too. Roughly 70% of first hires are engineers, and engineering accounts for at least 45% of the first five hires. Plan your equity pool with this in mind.
Cash benchmarks
Cash expectations stay high. As of June 2025, the average salary for new engineering hires on Carta was about $189,000, tied with product for the highest of any common job function. Founding engineers at seed often take less cash in exchange for more equity, but the market sets the anchor.
The AI premium
If you’re building AI-heavy healthtech, expect to pay more. Carta found equity packages are 50% smaller than in 2022, except in AI. AI and ML engineer salaries keep climbing too. Between January 2024 and June 2025, median salaries for AI and machine learning engineers rose by 5.4% to 9.1%, depending on startup size.
How to make equity count
A percentage on an offer letter means little without context. Strong founders explain:
- Current valuation and how the equity value works
- The vesting schedule and cliff
- What dilution to expect over the next two rounds
- Why this stage of risk deserves this level of ownership
Candidates who understand their equity value it more. Candidates who value it more negotiate less on cash.
The Red Flags of a Founding Engineer Mis-Hire
Picture a seed-stage healthtech founder six months after hiring their first engineer. On paper, the hire looked perfect. Senior title at a well-known health system vendor. Strong system design interview. Great references.
Six months in, the signs are clear:
- The founder still writes all the meaningful code. The engineer handles tickets but doesn’t drive the product forward.
- The architecture is built for a scale the company won’t hit for two years. Microservices, complex infrastructure and months of setup before the first pilot customer goes live.
- The engineer waits for direction. Every week starts with “what should I work on?” instead of “here’s what I think we should build.”
- Frustration builds on both sides. The engineer misses the structure of their old job. The founder misses the speed they expected.
This scenario is common. a16z flags misaligned expectations as one of the most common and costly reasons early hires don’t work out. They add a point every founder should take seriously: in an early-stage company, even one mis-hire resulting in attrition stalls momentum and drains morale.
The final red flag is early departure. A founding engineer who leaves inside 12 months rarely leaves because of skills. It’s almost always risk tolerance or trust. Both are things you test for in the process, not after.
Catch it early. Set a 90-day check-in before the hire starts. Agree on what success looks like at day 30, 60 and 90. If the signals above appear by day 60, address them directly. Waiting rarely fixes a founding engineer mismatch.
Hire for the Problem You Have
Your founding engineer is not a junior version of your future VP of Engineering. They’re not a mid-level engineer you’ll manage closely. They’re the person who builds the foundation everything else sits on.
The founders who get this right do three things:
- They define the 12-month problem before writing a spec
- They screen for judgement, ambiguity tolerance and trust before technical depth
- They move fast once they find the right person
The founders who get it wrong hire the strongest CV and hope.
a16z summed up the stakes: “Early hires shape culture, define momentum, and steer the entire trajectory.” Your first engineer is the earliest hire of all.
Hiring your founding engineer? Book a call with Synaxia Group. We’ll pressure-test your 12-month problem, your spec and your equity offer before you start the search, then find the engineers who’ve built from zero in healthtech before.