Most Series A founders hire their first Sales Engineer about six months too late.
By the time you realise you need one, your AE is in three deals simultaneously where the technical questions have stalled out, your CTO is jumping on calls they shouldn't be on, and you've probably lost a deal you should have won.
So if you're reading this, it's either the right time or slightly overdue. Either way, here's how to do it properly.
What a Sales Engineer Actually Does
Before you write a job spec, get clear on what you're hiring for.
A Sales Engineer works in the sales cycle. They're the technical partner to your AE, running product demos, answering detailed technical questions, handling security questionnaires, running proof-of-concept engagements, and building confidence with the technical buyer on the customer side.
They bridge the gap between your product and the customer's existing tech stack. They translate. They troubleshoot. They close.
At Series A, your SE will also double up as a post-sales resource until you have a proper CS or solutions engineering function. That's fine. Just know it going in.
What to Look For
The profile that works at Series A is different from the SE you'd hire at a 200-person company.
Technical depth that's real. They need to understand your product genuinely, not just run a polished demo. When a customer's engineer asks a hard integration question, they should know the answer or know how to find it fast. Ask them about a time they had to go off-script in a technical conversation. See how they handle it.
Commercial awareness. Good SEs understand that their job is to support a sale. They know when to go deep on technical detail and when to bring it back to business value. If every answer they give is a feature list, that's a flag.
Communication under pressure. SE work is live performance. They're in front of customers, often on calls where the dynamic shifts unexpectedly. Can they think on their feet? Can they handle a hostile technical buyer without getting flustered or defensive?
Adaptability. At Series A, nothing is polished. The product has rough edges. The demo environment breaks sometimes. There are customer questions nobody has written a good answer to yet. The right SE is comfortable in that chaos.
Common Mistakes Founders Make
Hiring someone too senior too early. A former SE from Salesforce or ServiceNow might look impressive on paper, but they're used to selling established enterprise products with full sales support, deep reference libraries, and a brand that does half the work. At Series A, your SE needs to be a builder.
Confusing SE with Solution Architect. These are different roles. A Solutions Architect designs technical implementations. A Sales Engineer works the sales cycle. There's overlap, but if you hire a SA thinking they'll love doing demos, you'll find out quickly.
Skipping the live demo in the interview. This one is obvious and still gets skipped. Ask every SE candidate to demo your product. They don't need perfect product knowledge — give them prep time. What you're testing is how they handle the format, how they read the room, how they handle a curveball question.
Not defining the SE/AE relationship. If your AE thinks the SE is there to take orders, and your SE thinks they have a seat at the commercial table, you'll have friction immediately. Decide how you want the relationship to work before you hire.
How to Structure the Interview Process
Keep it simple. Here's a four-stage process that works well at Series A:
Stage 1: Screening call. 30 minutes. Cover their background, what they're looking for, why they're interested. Don't ask them to prepare anything for this.
Stage 2: Technical and domain interview. 45-60 minutes with your CTO or Head of Product. Go deep on their technical background. Test how quickly they pick up new concepts.
Stage 3: Live demo. Send them a product walkthrough and give them 48 hours to prep. Then run a mock sales call where you play a typical buyer persona. Throw in one or two awkward questions.
Stage 4: Founder or VP of Sales conversation. Do you trust this person in front of your most important deals? That's the only question that matters here.
What You Should Expect to Pay
At Series A in the UK, a strong SE with 3-6 years of experience is typically looking at £70k-£90k base, with OTE sitting 20-30% on top. In the US, you're looking at $120k-$160k base, with OTE structured similarly.
One Last Thing
Your first SE will do a lot of shaping of how the function works at your company. They'll build the demo environment, write the first technical FAQs, create the proof-of-concept framework. The right person treats that as a feature of the job, not a burden.
Hire for that mindset.