Stop renting your roadmap. In one week, prototype the in‑house slice that replaces the 20% you actually use - complete with TCO, migration plan, and a path to production.
Book Prototype in the Room • Run the payback math
POV: Build vs. Buy just changed.
Agents turn the 20% you actually use into a thin, ownable system - with lower run‑rate, faster change, and clean integrations.
Taglines to test
- Buy less. Build smarter.
- Keep the value. Lose the markup.
- From seats to sovereignty.
- Replace SaaS, not your process.
- Own your core. Own your margin.
- The “SaaS tax” ends here.
Executive narrative
For a decade, “buy” beat “build” because packaged software shipped features and UI faster than small teams could. Agents flipped that trade‑off. Today, a tiny team can compose reliable workflows - retrieval, tools, evaluations, and human approvals - around your data model in days. You keep exactly the capabilities you need, integrate cleanly, and move at your own pace. The question isn’t “Can we build the whole product?” It’s “Should we own the 20% that drives our margin?”
Five reasons “build” wins more often (now)
- Economics: Swap perpetual seat bloat for a small internal run‑rate. (CFO: lower TCO, shorter payback.)
- Change velocity: Release weekly, not on someone else’s roadmap. (CIO: faster iteration without re‑platform risk.)
- Integration fit: Native to your identity, data, and controls. (Ops: fewer brittle workarounds.)
- Data & leverage: Easy exports, transparent logic, no black boxes. (Security: auditable, least‑privilege.)
- Right‑sized UX: Thin UIs for operators; agents for the heavy lifting. (Product: more outcome per sprint.)
Build vs. Buy vs. Blend (the new default)
- Build: The 20% you use constantly (and need to change often).
- Buy: Regulated/commodity areas (payroll, tax, payments).
- Blend: Keep a minimal vendor core; wrap your unique flows with agents.
Your flagship offer, Prototype in the Room, becomes the decision engine for all three paths.
Agentability Scorecard
Score 1–5 (low → high). ≥ 26 → build/prototype candidate.
- Usage Concentration: Small subset of features drive most value
- Change Frequency: Needs tweaks monthly/weekly
- Integration Pain: Current tool fights your data model
- Data Gravity: Your data already lives in your stack
- Compliance Fit: Residency/controls the vendor can’t meet
- UI Complexity Needed: Thin UIs + checklists are sufficient
- Risk of Downtime: Vendor outages hurt; you need fail‑open options
- Internal Talent: You can staff 0.2–0.5 FTE to own it (or retain us)
Use this score live in Prototype in the Room to prioritize the slice you’ll prototype.
Green‑light Prototype in the Room to ship a thin, working slice in 1–5 days (or choose the 1‑week MVP‑Starter).
- Usage concentration — Cut the 80/20 slice and ship a thin end‑to‑end prototype.
- Change frequency — High change velocity favors owning the slice; build to keep iteration in your control.
- Integration pain — Map data flows and wrap brittle vendor APIs; prioritize the worst friction first.
- Replace Your SaaSStand up an owned agentic workflow where vendor pain is highest.Integration pain + internal data gravity (or SaaS replacement mode) indicate an owned workflow is viable.
- Prototype to ProductionHarden: integrations, guardrails, evals, observability, rollback.Risk/operability signals—add guardrails, evals, observability, and rollback patterns early.
What each factor measures and how to score it. Use the 1/3/5 anchors to calibrate your inputs.
Usage concentration
- Tier-1 support macro used by 8 reps 50+ times/day.
- AP invoice triage done by 2 specialists.
Change frequency
- New SKUs weekly; promos rotate daily.
- Pricing rules adjusted every sprint.
Integration pain
- CSV uploads for core data.
- Vendor webhook limits throttle ops.
Data gravity
- Customer 360 in warehouse; service logs centralized.
- Internal feature store exists.
Compliance fit
- SOX controls defined; approval matrix exists.
- PII redaction policies enforced.
UI complexity needed
- Two-field intake + checklist.
- Single-page “approve/deny with note”.
Risk of downtime
- Missed SLAs when vendor throttles.
- Revenue loss if queue stalls.
Internal talent
- 1–2 builders w/ tool-calling experience.
- On-call rotation + observability in place.
Reporting quality
- Events with user/session IDs; Looker/Mode dashboards reviewed weekly.
- Agent eval suites (golden sets, A/B) and alerting wired.
- Higher scores mean stronger fit for a build/prototype with agents.
- Default pass bar is 26/45. Adjust to tune your bar.
- Use alongside the Buy vs Build ROI Calculator to combine qualitative and financial signals.
- Run this live in Prototype in the Room to select a thin vertical slice for the spike.
Simple ROI / payback math
Baseline SaaS spend (B) = seats × price/seat × 12 + overages
Internal run‑rate (R) = infra + (maintenance FTE × loaded cost)
Build cost (C) = days × blended rate
Payback (months) = C ÷ (B − R)
3‑yr NPV = discounted Σ(B − R) − C
Rule of thumb: If payback < 12 months and the scorecard ≥ 26, green‑light a prototype.
Run the numbers
Buy vs Build ROI Calculator
Compare the total cost of a SaaS subscription (buy) vs building in‑house (build). Adjust inputs to see payback, NPV, IRR, and savings.
Buy (SaaS)
Time/contractor costs to administer the SaaS
Build (in‑house)
Fractional FTE to maintain feature parity
Financial Settings
Used for NPV and IRR calculations
Results
Assumptions & Notes
- Baseline SaaS B = seats × price/seat × 12 + overages.
- Buy TCO includes your annual admin/ops cost for the SaaS.
- Run‑rate R = infra + (maintenance FTE × loaded cost).
- Build cost C = days × blended rate (one‑time at t=0).
- Payback (months) = 12 × C ÷ (Buy TCO − R). If savings ≤ 0, there’s no payback.
- NPV/IRR use annual cashflows: −C at t=0; +Savings at t=1..N.
- Results are directional and exclude taxes, risk adjustments, and scope creep.
Objections → crisp responses
- “We don’t have dev capacity.” – We deliver a runnable slice + backlog. Either we build MVP, or your team finishes with our docs/tests - headcount‑neutral to start.
- “Will we rebuild a complex product?” – No. We build the smallest slice that fits your model and drop the rest. Monolith → mosaic.
- “Security/compliance?” – Read‑only credentials for discovery, “ask‑to‑act” gates for writes, RBAC & audit from week one.
- “What if the vendor catches up?” – You still win: the capability map + prototype gives leverage at renewal. Keep the slice, or negotiate from strength.
How the decision works (4 steps)
- Map capabilities → 2) Prototype slice → 3) TCO/Payback → 4) Decide: Build • Buy • Blend
Why this wins now
Cards to highlight: Economics • Change velocity • Integration fit • Data leverage • Right‑sized UX
Marketing & SEO engine
- Agents continuously monitor search trends, social signals, and analytics to spot breakout opportunities.
- Bulk generation pipeline (content + images) lets you target niches fast and publish static pages with clean JSON‑LD for SEO.
- Automated validation ensures quality (duplication, relevance, safety) before publish.
- Feedback loops tweak prompts, keywords, and internal linking based on real performance.
Proof & governance
- Add 2–3 projects or before/after diagrams
- Security & governance: RBAC, audit, redaction, approvals
- Two paths: We build MVP • You build (handoff package)