Growth finance for Series A companies: the 90-day install for professional services firms
The exact 90-day plan for standing up growth finance at Series A — the point where the founder can no longer be every function. Written for managing partners and heads of business development at consultancies and agencies.
This edition is written for managing partners and heads of business development at consultancies and agencies. In professional services firms, professional-services buyers hire partners, not vendors, and the pitch has to reflect that, so the way you install growth finance has to reflect that reality from day one.
Series A is the moment growth finance stops being optional. The founder has to step out of some of the work, the plan requires a defensible growth number, and every quarter compounds toward the next raise.
Day 1 to 30: diagnosis and instrumentation. Name the constraint, write the ICP, wire CAC payback and gross margin into the board pack.
Day 31 to 60: first live cycle at 20% of planned volume. Founder still in every review. Kill criteria written and enforced.
The binding constraint we see in professional services firms is almost always senior partner time, not lead volume. Growth finance is only useful in this vertical when it is pointed at that constraint — not at a generic growth number borrowed from another category.
Day 61 to 90: ramp to full volume, hire the first dedicated operator, and hand off ops. Founder retains strategy and the weekly review.
By day 90 the metric is legible and the trajectory is defensible. This is what turns a Series A story into a Series B round.
Trap most Series A companies fall into: optimising for growth rate at any cost. It usually shows up around day 45 when the founder tries to hire ahead of the model.
The Series A version of growth finance looks small compared to what you will build at Series B. That is the point — it is a foundation, not a monument.
Concretely for professional services firms: one signed retainer typically funds the entire growth program for a year. That is the reason it is worth installing growth finance properly rather than half-heartedly across three vendors.
Frequently asked questions
Growth Finance · professional services — answered
- Does growth finance work for professional services firms?
- Yes — provided it is aimed at senior partner time, not lead volume rather than a generic growth number. One signed retainer typically funds the entire growth program for a year.
- Should we start growth finance before Series A?
- Yes if the founder has time; the Series A version is the same model at higher spend.
- How much of the round should fund growth finance?
- Meaningful — often 20–30% of the growth line — but only after diagnosis.
- When do we hire the first growth finance operator?
- Around day 60, once the model has run one full cycle with the founder.
- What Series A trap should we avoid?
- Optimising for growth rate at any cost — usually a premature senior hire.
- What is the professional services specific pitfall with growth finance?
- Running the generic playbook without adapting to professional-services buyers hire partners, not vendors, and the pitch has to reflect that. The install has to be vertical-first.
Growth Broker editorial
Filed under growth finance · professional services