Every pre-seed founder asks the same question in some form: "How do I get this thing built without losing my shirt?" The three real answers — equity-aligned co-build, fixed-price agency, full-time CTO — have wildly different cost, speed, and risk profiles. After running each model across multiple ventures, here's the decision matrix I'd hand to a founder version of myself today.
Define the three paths
Co-Build
An equity-aligned partnership with a founder-operator who brings their team. Cash: low or zero. Equity: 15–35%. Duration: 6–18 months active build + ongoing advisory.
Agency
A fixed-price or retainer engagement with an external team. Cash: high ($8k–$20k/mo). Equity: zero. Duration: project-bounded (4–12 weeks typically).
CTO Hire
A full-time technical co-founder or senior engineering leader. Cash: very high ($180k–$250k/yr). Equity: 1–2%. Duration: long-term (3+ years intended).
Year-1 cost comparison
Assuming you ship a real product (not a prototype) by month 6 and have it live in production by month 12:
| Cost type | Co-Build | Agency | CTO Hire |
|---|---|---|---|
| Cash year 1 | $0–$120k | $80k–$200k | $220k–$280k |
| Equity | 15–35% | 0% | 1–2% |
| Hiring cost | 0 | 0 | $30k–$50k |
| Ramp time cost | 0 | 0–$10k | $30k–$40k |
| Team brought along | 6 people | 5–8 people | 0 |
Speed-to-revenue comparison
How long until you have a paying customer? Real numbers from comparable engagements:
- Co-build: 8–14 weeks. The partner has shipped 10+ before; pattern recognition collapses decision time.
- Agency: 12–20 weeks. Good agencies match co-build on raw output but lose 2–4 weeks to scope-mgmt and approvals.
- CTO hire: 24–40 weeks. First 8 weeks is ramp + first hire (one engineer). Real shipping starts month 3–4.
If runway is < 12 months, this difference matters enormously.
Risk + dilution comparison
Co-build risks
- Partner doesn't deliver — but 30-day trial sprint mitigates this
- Higher dilution if Series A pricing is bad (15%+ to partner before Series A)
- Co-founder dynamics — strategic disagreement at month 18
Agency risks
- Cash burn with no equity protection
- Vendor lock-in if they own the codebase weirdly
- Quality drop after the senior on your pitch is gone
CTO hire risks
- Bad hire = $80k+ in severance and 4 months of velocity loss
- Burnout / churn — 30% of pre-seed CTO hires leave within 18 months
- Decision bottleneck — every architecture decision goes through you both
The decision matrix
Pick your dominant constraint:
| Your situation | Best fit |
|---|---|
| Pre-revenue, <$300k runway, no tech co-founder | Co-build |
| Post-revenue, $500k+ runway, fixed scope project | Agency |
| Post-Series-A, scaling phase, hiring underway | CTO hire |
| Solo founder, AI-heavy product, no technical background | Co-build |
| Multi-founder team with a domain-expert CTO already | Agency (for specialist work) |
| Regulated industry (banking, healthcare) | CTO hire (long-term continuity) |
When co-build wins (and when it doesn't)
Wins when:
- You have a customer wedge but not a product
- Cash conservation matters more than dilution
- You want to ship in < 12 weeks
- You'd benefit from having a peer to make decisions with
Doesn't work when:
- You're already a strong technical founder — adding another CTO-level peer creates over-redundancy
- The product is highly regulated or has 3+ year cycle times
- You're optimizing for max equity retention pre-Series A (then Agency wins)
Real founder examples
Three composite scenarios from real partnerships I've watched (names changed):
Founder A — pre-seed B2B SaaS, 9 months runway, no tech
Picked co-build. Partner brought 6-op team, shipped MVP in 7 weeks, had first paying customer in week 11. Raised $2M seed at month 14. Outcome: founder kept 55% equity, partner has 25%, Series A took 20%. Founder is happy.
Founder B — Series A AI infra play, $4M runway, technical CEO
Picked agency for a 12-week marketing site + analytics dashboard. Spent $80k. Got exactly what they specced. CEO continued running engineering with 4 in-house. Outcome: textbook agency engagement, no surprises.
Founder C — Series B fintech, regulated market, looking for VP Eng
Picked CTO hire. Spent 4 months recruiting, paid $250k year-1 + 1.5% equity. Wrong fit hire month 9, replaced at month 12. Eventually settled with the second hire who's been there 2 years. Outcome: necessary for regulatory + long-term continuity, but expensive year 1.