01
Architecture audit + upgrade path
Honest assessment of what's load-bearing, what's fine, and the order to upgrade in.
MVP → SaaS Upgrade
The upgrade path that prioritizes phased changes over a rewrite.
Your MVP already has users. The codebase wasn't built for year two. We phase the upgrade so you keep shipping while tenancy, billing, roles, and observability quietly get real.
Timeline confirmed after scope review
Engagement commitments
- Scope and acceptance criteria documented
- Code ownership defined before delivery
- Handoff plan included in the project scope
Architecture audit
Upgrade path brief
What lands in your inbox after the 30-minute architecture review.
- Current state
- Honest audit - what's fine, what's load-bearing
- Upgrade order
- Ranked by impact vs. risk vs. user blast radius
- Phasing
- 3–4 sprints, each shippable independently
- What stays
- List of MVP decisions we keep on purpose
No 'burn it all down' plans. Ever.
Week 1
Accelerated by
Cursor
Kiro
Copilot
Antigravity
ReplitFrontier LLMs
CursorKiroCopilotAntigravityReplitFrontier LLMs
What gets shipped
Upgrades behind feature flags. Zero downtime, zero drama.
Every MVP-to-SaaS engagement produces the same set of artifacts - phased, reversible, yours to keep.
Exact team shape and timeline are confirmed in the written scope.
02
Tenancy migration
org_id added, data backfilled, every query scoped. Shipped behind a flag, verified, then enforced.
03
Billing that handles real SaaS
Plans, seats, proration, trials, failed payment retry, dunning - on Stripe done right.
04
Roles + permissions
Owner/admin/member with server-enforced policies. UI follows automatically.
05
Observability kit
Sentry, structured logs, SLO pages, real alerts. Added before paying customers arrive.
06
Safety net for future changes
CI + tests on the critical paths, so your team keeps shipping after we hand off.
The Process
How the upgrade runs
- 01
Architecture audit
30 minutes of review, 2 days of write-up. Honest map of what to fix and what to leave alone.
- 02
Phase 1: the load-bearing fix
The biggest risk item gets fixed first - usually tenancy or billing - behind a feature flag.
- 03
Phase 2–3: the rest
Each upgrade shipped independently, tested in prod, and only enforced after it's proven.
- 04
Handoff + runbooks
Architecture doc, decision log, and runbooks for the 10 things most likely to break post-upgrade.
Typical timeline:Confirmed after scope review
Before / after
What actually changes between MVP and real SaaS.
Toggle between the two states. These are the load-bearing systems every upgrade touches - and how they look before and after.
Auth
Single-table users. One admin role hardcoded.
Data model
Flat schema, no tenant scoping.
Billing
Stripe Checkout for a single plan.
Observability
console.log and hope.
Safety net
Manual QA, occasional broken deploys.
3–5
weeks typical upgrade window
0
rewrites required
100%
of shipped features preserved
Pricing & timeline
Upgrade cost, without the agency opacity.
These are planning ranges, not a quote. Scope, integrations, and constraints determine the final price and timeline.
Focused upgrade
2–3 weeksFrom $5k
One or two load-bearing systems (usually tenancy or billing). Fast, surgical.
- Architecture audit
- One upgrade phase, flagged + rolled out
- Handoff + runbook
Full MVP→SaaS
3–5 weeksFrom $10k
The default. Tenancy + billing + roles + observability, phased, zero feature freeze.
- Everything in Focused
- All four load-bearing systems
- Safety net (tests + CI)
- 30-day post-upgrade support
Upgrade + ongoing partner
5+ weeksFrom $14k
Full upgrade plus a month of embedded work to prove it holds under real growth.
- Everything in Full MVP→SaaS
- 4 weeks of post-upgrade embedded work
- Weekly roadmap input
What moves the number
- Tenancy complexity
- Orgs only = fast. Orgs + workspaces + nested teams = longer.
- Billing model
- Flat plans = quick. Usage-based + seats + proration = where weeks go.
- Test coverage today
- No tests means we write them as part of the upgrade. Adds time but non-negotiable.
- Stack age
- Old dependencies sometimes need an upgrade first. We'll call it out on the audit.
A written quote is confirmed after scope review.
FAQ
MVP to SaaS Upgrade Path FAQ
How do you upgrade tenancy without downtime?
Schema change first, backfill org_id via migration, deploy with a compatibility layer so old queries still work, then cut over query by query behind a flag. Zero-downtime, reversible at every step.
What if our MVP is genuinely that bad?
Sometimes one module really does need a rewrite. We'll say so on the audit. But 'the whole codebase is garbage' is almost never true - it's usually 1–2 load-bearing systems carrying the problem.
Can we keep shipping features during the upgrade?
Yes, and you should. That's the whole point of phasing the work. A feature freeze mid-upgrade is how rewrites start.
What if we already tried and it's half-done?
Common. We'll pick up whatever shape it's in, make the upgrade path coherent again, and finish it without forcing you to re-do the work already done.
What stack do you work in?
Postgres + Node/Python is our home. Happy to work in whatever you have. We'll tell you on the audit if anything about your stack makes the upgrade materially harder.
How do we start?
Book a free 30-minute architecture audit. You'll get a written upgrade path inside 48 hours.
Build plan
Ready to upgrade without rewriting?
Share your scope and constraints. We will respond with any clarifying questions and a practical next step.
Know what you need
Send a brief. A senior engineer will review it and follow up with clarifying questions or a practical next step.
Need help scoping
Book a 20-minute call. We’ll map the scope together - no sales pitch.Book a call
Or email us at hello [at] codivox [dot] com