The 4 GTM Hiring Mistakes Series B Companies Keep Making
By Daniel Bryant · 2 May 2026
The Series B Inflection Point
The four GTM hiring mistakes Series B SaaS companies repeat are: hiring executives from companies ten times their size, adding AEs before the SE and CS foundation exists, writing job descriptions that describe three roles in one, and compromising on candidate quality to fill roles faster. Each mistake is driven by scaling pressure overriding hiring discipline, and each costs six to eighteen months of lost momentum to correct.
Series B is when most SaaS companies shift from “figuring out product-market fit” to “scaling the go-to-market machine.” The board wants growth. The CEO wants a team that can deliver it. The pressure to hire fast is intense.
This is exactly when the most expensive hiring mistakes happen. Not because the companies are careless, but because the urgency of scaling overrides the discipline of getting each hire right.
I have watched this pattern from the recruiting side for years, placing Sales Engineers, CSMs, and GTM leaders into Series B+ SaaS companies across Australia and the US. The same four mistakes come up repeatedly.
Mistake 1: Hiring for the Company You Want to Be, Not the Company You Are
A Series B company with $8M ARR and 60 employees hires a VP of Sales from a $200M company with a 300-person sales organisation. On paper, they are hiring experience and scaling expertise. In practice, they are hiring someone who is used to operating within an infrastructure that does not exist yet.
The VP shows up expecting an SDR team, a marketing engine generating qualified pipeline, RevOps support, and a mature CRM. Instead, they find founders doing outbound, a CRM that is half-populated, and a marketing team of two. The playbooks they bring do not fit. Within nine months, they are gone.
The same thing happens at the IC level. Hiring a Sales Engineer from a company with a 15-person SE team, dedicated demo environments, and a mature enablement function — and dropping them into a Series B where they are SE number two, building their own demo instances, and fielding product support questions — does not work unless the candidate has explicitly chosen and prepared for that kind of environment.
The fix: Hire for the stage you are at, with the potential to grow into the next stage. Ask candidates what the smallest team they have worked in was. Ask what they built from scratch. If every answer involves inherited infrastructure, they are wrong for your stage.
Mistake 2: Hiring AEs Before the SE and CS Foundation Exists
The instinct at Series B is to hire salespeople. More AEs means more pipeline means more revenue. This logic is correct in isolation and dangerous in context.
AEs without Sales Engineers to support complex deals will lose on technical depth. AEs who close customers that get handed to an under-resourced CS team will generate churn that offsets the revenue they brought in. The GTM engine is a system, and staffing one part while neglecting the others creates expensive friction.
The hiring sequence matters. For a technically complex B2B SaaS product, the right order is usually: first SE, first CSM, then additional AEs. The SE increases deal velocity and win rate for the AEs you already have. The CSM protects the revenue those AEs generate. Only then does adding more AEs make sense.
The fix: Before hiring your next AE, ask whether your existing AEs are losing deals due to lack of technical pre-sales support, and whether your existing customers are getting the attention they need to renew and expand. If the answer to either question is yes, your next hire is not an AE.
Mistake 3: Writing Job Descriptions That Describe Three Roles
Series B job descriptions are often wish lists. The company needs a lot done and tries to compress it into one hire. The result is a job description that asks for a Sales Engineer who also does product management and occasionally supports customers post-sale. Or a CSM who also does onboarding, manages renewals, runs QBRs, and owns expansion revenue.
These hybrid descriptions attract candidates who are generalists — decent at many things, excellent at nothing. The candidates who are truly strong at one function read the job description and think, “They do not know what they actually need.”
The fix: Define the primary function of the role. What is the one thing this person needs to be excellent at? Build the job description around that. Secondary responsibilities can exist, but the primary function should be clear enough that the right candidate recognises it immediately.
Mistake 4: Optimising for Speed Over Fit
When the board is asking for growth and the CEO has committed to a hiring plan, speed becomes the priority. The recruiter presents three candidates. One is good but not great. The hiring manager knows they should keep looking but also knows the role has been open for six weeks and the team is feeling the gap.
They hire the “good enough” candidate. Six months later, the candidate is performing at 70% of what the role requires. Not bad enough to fire. Not good enough to drive the outcomes the company needs. They become a permanent drag on the team’s velocity — and eventually need to be replaced anyway, restarting the clock.
The fix: Set a quality bar before you start the search and do not lower it under time pressure. A role that stays open for eight weeks and gets filled with the right person produces better outcomes over 18 months than one filled in four weeks with a compromise candidate. The math is not even close.
The Common Thread
All four mistakes share a root cause: the pressure to scale overriding the discipline to scale well. Series B is the most important GTM hiring window in a SaaS company’s lifecycle. The people you hire now will define your revenue trajectory for the next two to three years.
At Zionic, we work exclusively with B2B SaaS companies hiring GTM talent. We know what “right for the stage” looks like because it is all we do. If you are at Series B and building your GTM team, let’s talk.