The Problem
AI agent startups are scaling sales teams, closing deals, then watching customers disappear. The pattern is consistent: deals sign, implementations stall, agents underperform, customers churn.
Jason Lemkin, who scaled EchoSign past $100M ARR before Adobe acquired it, has seen this play out dozens of times through SaaStr Fund investments. His take: founders are hiring the wrong post-sales roles in the wrong order.
FDE vs CSM: The Framework
The decision comes down to where your constraint actually sits.
Hire Field Deployment Engineers first if:
- Time-to-value exceeds 60 days
- Customers training agents themselves hit 40-50% of potential performance
- Silent churn: customers sign, go quiet, never launch
- NPS feedback clusters around "could not get it working"
Hire Customer Success Managers if:
- Agents are already live and performing for most customers
- Churn happens at renewal despite successful deployments
- Onboarding is predictable and repeatable without customisation
- Most customers hit goals in first 30-60 days
What This Means for Sales Org Budget
Lemkin's actual recommendation: do not choose between FDEs and CSMs. Sequence them.
Get one strong FDE embedded with your top 3-5 customers. Document what they do. Systematise the training. Then hire CSMs to maintain relationships at scale.
The budget implication: FDEs typically cost more than CSMs (think Solutions Engineer comp, not Account Manager comp), but hiring CSMs before deployment is solved means paying people to manage unhappy customers.
The Broader Pattern
This maps to a larger trend in AI product go-to-market: the implementation gap is wider than in traditional SaaS. AI agents require training, tuning, and iteration that generic customer success playbooks do not cover.
For ANZ startups building AI agent products, this means rethinking post-sales hiring ratios. The old SaaS model of 1 CSM per $2M ARR does not hold when your product needs field deployment expertise to actually work.
Bottom Line
Deployment is the new constraint in AI B2B, not retention. Scale implementation support before you scale sales, or accept that your churn rate will stay ugly no matter how many check-in calls your CSMs book.