B2B SaaS App Development · Fixed Price · 8 Weeks · PM & Senior Engineers Included
Written technical spec signed before we write a line of code. PM who owns the sprint decisions — not an account manager relaying messages. Senior engineers whose code your next hire can read. If we miss Sprint 1 scope, we finish it free. In the contract.
Free 30-minute scoping call. Written estimate after. No commitment required.
App Build Sprint
The Problem
Every offshore dev shop says fixed price. The contract says “time and materials” on page 3. Here is what the burned founder already knows.
“Eight months. $60K. A zip file with no documentation and code nobody else can read.”
The offshore shop delivered eventually. What they delivered was a codebase only they understand — vendor lock-in baked into the architecture. Your next developer quotes a $40K rewrite before touching anything.
“I managed the developers instead of running the business. Every spec gap cost me a week.”
No PM means the founder is the PM. Every “is this what you meant?” lands in your inbox at midnight. You hired engineers — nobody told you you were also buying a second job.
“The scope crept. The price crept. The deadline moved three times. Nothing was in writing.”
Vague contracts are designed for the vendor’s benefit. Scope creep is not an accident — it is a business model. A written spec signed by both parties before development starts is the only structural fix.
“I tried no-code. Hit the ceiling at $80K ARR when I needed real auth and multi-tenancy.”
Bubble is fast to start and expensive to rewrite. Every B2B SaaS hits the no-code ceiling. The question is whether you hit it at $0 ARR or at $300K ARR — when the forced rewrite costs the most.
What You Receive
The App Build Sprint delivers a deployed, instrumented, documented product — in your repository, on your infrastructure, owned entirely by you.
Written technical specification, signed before development starts
Exact scope, architecture, acceptance criteria. Signed by both parties. The mechanism that makes fixed price real — no written spec means no fixed price, regardless of what the proposal says.
Backend & API — Python/Node.js/Laravel + PostgreSQL + Redis
RESTful or GraphQL API, documented. Authentication (email/password + OAuth), multi-tenant architecture, RBAC, unit tests on critical paths. Industry-standard, investor-legible, infinitely extensible.
Frontend — React (TypeScript) with component library
Desktop-first for B2B SaaS, mobile-ready. Form handling, loading states, error boundaries. Implemented from your Figma designs or from standard component library if none provided.
Integrations scoped at intake — Stripe, SendGrid, PostHog, OAuth
Standard integrations included. CRM or ERP integrations (HubSpot, Salesforce) scoped per your stack and agreed in the written spec — not discovered as extras at week six.
Infrastructure & CI/CD — Docker, GitHub Actions, AWS/GCP
Staging and production environments. SSL, uptime monitoring, database backups, structured logging. Your product ships production-grade, not staging-ready.
Analytics instrumentation — PostHog event tracking from day one
Key user actions tracked, funnel configured, error monitoring live. You can see on launch day whether the product is working — not in a retrospective report six weeks later.
Full documentation handover — architecture, API, deployment runbook
Architecture diagram, database schema, API docs, deployment runbook, environment variable reference, onboarding notes for your next developer. Source code delivered to your repository, not ours.
The 8-Week Breakdown
The timeline is contractual. Each sprint has defined deliverables, defined acceptance criteria, and a signed checklist before the next sprint begins. No surprises at week six.
Weeks 1–2
Sprint 0: Foundation
Sprint goal
Working skeleton. Auth, database schema, CI/CD running, staging live.
Acceptance criteria
Client can log in, view authenticated dashboard, and be assigned a role. All engineers can deploy to staging via CI/CD. Database schema reviewed and approved.
Weeks 3–4
Sprint 1: Core Feature
Sprint goal
Primary user-facing feature working end-to-end. Not polished, but functional.
Scope guarantee applies here
If Sprint 1 does not deliver the agreed core feature as defined in the spec, the team extends Sprint 1 at no additional cost until acceptance criteria are met. This is in the contract.
Weeks 5–6
Sprint 2: Integrations
Sprint goal
Secondary features and integrations. Product is getting close to complete.
Acceptance criteria
Billing: test subscription creation, upgrade, and cancellation. Integrations: end-to-end data flow verified with client’s test accounts. Secondary features: demo walkthrough with client.
Weeks 7–8
Sprint 3: Production Launch
Sprint goal
Production-grade. Ready for real users.
Final acceptance
Client logs in on production. Backup restore verified. Documentation reviewed. All credentials transferred. Final acceptance sign-off. 30-day warranty period begins.
The Scope Guarantee
The scope guarantee is not a marketing claim. It is in the contract. Here is exactly what it covers and what it does not.
At the end of Sprint 1 (weeks 3–4), the deliverables agreed in the signed technical specification are either delivered to acceptance criteria and invoiced, or not fully delivered — in which case the team continues Sprint 1 work at no additional cost until acceptance criteria are met.
Sprint 1 deliverables were agreed in the signed spec and accepted by both parties. The team did not deliver them to the agreed acceptance criteria by the end of week 4.
The team continues Sprint 1 at no additional charge until the agreed acceptance criteria are met. Not a credit. Not a negotiation. Continuation until done.
Requirements not in the signed spec. Changes requested after signing. Delays caused by client-side dependencies — third-party credentials not provided, feedback not given within 48 hours.
All scope changes are discussed between sprints, not within them. Each change is presented with description, estimated time, estimated cost. Client approves or declines before the next sprint begins.
Cancellation: if you cancel after Sprint 0 but before Sprint 1 begins, you owe nothing beyond the Sprint 0 fee. No lock-in to a full 8-week engagement until Sprint 1 acceptance.
Team Composition
Standard configuration: 1 Project Manager + 2 Senior Engineers. This is the minimum configuration. Larger builds are staffed accordingly at the scoping session.
Not included in standard sprint
Dedicated QA engineer (testing handled by engineers) · Designer (we implement from your Figma, or standard component library if none provided) · Data engineer (analytics instrumentation included; data warehouse is an upgrade) · DevOps (deployment automation included; bespoke multi-region infra is an upgrade)
I’m Jake. 8+ years in B2B SaaS product and growth — not as a developer shipping features, but as the person accountable for whether those features moved the business. I’ve scoped, staffed, and delivered product sprints across healthtech, adtech, edtech, and B2B tools.
I started ProductQuant because I kept seeing the same problem: founders managing dev shops with no product thinking in the team. Engineers shipped exactly what the brief said. The brief was wrong. Nobody caught it until the feature was live and the metrics didn’t move.
10+ years building backend systems, APIs, and data pipelines. Specialises in PHP/Laravel, Node.js, React, and complex architecture. Backend that your next hire reads and maintains without calling the original agency.
7+ years shipping distributed systems and AI-integrated applications. Technical team lead with deep experience in Node.js, TypeScript, and C#/.NET. Has built real-time voice+vision assistants, GPT-powered publishing engines, and SSE streaming systems.
7+ years building full-stack web applications with a focus on React, TypeScript, and NestJS. Deep experience designing and shipping multi-module platforms — multi-tenant auth, role-based access, and productivity app integrations.
The Stack
Industry-standard, investor-legible, infinitely extensible. Investor technical due diligence on a Bubble app ends conversations. This doesn’t.
The stack you build on day one determines what you can do on day 365. No-code tools give you day-one speed and day-365 walls. A production React/Node/PostgreSQL stack gives you a platform that scales as the product scales — and passes technical due diligence at every funding stage.
The total cost of a no-code MVP that hits its ceiling and requires a full rewrite is 2–3x the cost of building on a proper stack from the start. The faster initial cost of no-code is an illusion amortised over the rewrite timeline.
How We Compare
The founder who gets burned doesn’t choose a bad agency on purpose. They choose an agency with an ambiguous contract. The comparison is structural.
| Offshore dev shop | Senior FTE hire | No-code (Bubble) | ProductQuant Sprint | |
|---|---|---|---|---|
| Price model | Time & materials — or “fixed” that becomes T&M on page 3 | $150K–$220K/year fully-loaded | Platform subscription + rewrite cost later | Fixed price in signed contract |
| Timeline | 6–12 months — aspirational, not contractual | 3–6 months recruiting before any code written | Fast to start, rewrite required at $200K–$500K ARR | 8 weeks — contractual |
| Accountability | No recourse when scope isn’t delivered | No PM — founder manages the engineer | No contractual recourse — platform owns the product | Sprint 1 free if we miss scope. In the contract. |
| PM included | Account manager who relays messages | Founder is the PM | No PM, no engineering team | PM owns sprint decisions, not a coordinator |
| Code quality | Variable — junior to mid, minimal documentation | One person’s throughput, context dies when they leave | Proprietary platform, no real codebase | Senior engineers, documented, maintainable by next hire |
| Scalability | Depends on team — often rewrite required | One person’s throughput — no surge capacity | Hits ceiling at multi-tenancy / complex billing | React/Node/PostgreSQL — scales to Series B+ |
| Investor DD | Depends on documentation — usually painful | Depends on engineer’s documentation habits | Bubble app ends the diligence conversation | Architecture docs included — non-event at diligence |
| Ownership | Codebase in a zip file — often without docs | You own the code — if they documented it | Platform owns the product — no IP transfer | Source code to your repo from day one |
Pricing
Every engagement includes a PM, senior engineers, analytics instrumentation, architecture documentation, and source code transfer. If the first sprint doesn’t deliver the agreed scope, it continues at no charge.
Fixed price · scope agreed in writing before start
One feature. Scoped, built, and shipped in 3–4 weeks. You describe the outcome — we spec it, build it, and hand it over at a fixed price.
Scope guarantee: Sprint 1 free if we miss the agreed spec.
Fixed price · scope agreed in writing · 30% deposit on signing
Full B2B SaaS MVP — from written spec to production deployment. React, Laravel/Node.js, PostgreSQL. PM + senior engineers. Documentation and source code transfer included.
Scope guarantee: Sprint 1 free if we miss agreed spec. Finish-free if total 8-week scope is missed by our fault.
PM + engineers working as part of your team
External engineering capacity that slots into your existing product. Two-week sprints, signed acceptance each cycle. You direct the roadmap — we own delivery quality.
Clean handover: documented code your engineers can maintain from day one.
Payment structure — App Build Sprint
30%
Deposit on contract signing
30%
Sprint 1 acceptance sign-off
20%
Sprint 2 acceptance sign-off
20%
Sprint 3 (production launch) sign-off
Trust Signals
Before we write a line of code. The spec defines exact scope, architecture, acceptance criteria. Not a proposal — a signed document.
You sign off on each sprint before the next begins. No invoicing without a matching acceptance checklist. No “well, that wasn’t in scope” surprises.
You own the code immediately. Not at the end of the engagement — from Sprint 0. If we close tomorrow, the product works and belongs to you.
You speak to the PM. The PM speaks to the engineers. There is no account manager relaying messages between you and the people building your product.
No obligation, no invoice. The scoping summary belongs to you — take it to any other vendor. We only proceed if the fit is real.
React, Laravel/Node.js, PostgreSQL. Not “modern tech” — named tools. Not “experienced team” — named engineers with verifiable history.
Common Questions
Fixed price. Written spec. First sprint guaranteed. Book the free 30-minute scoping session — no commitment, no invoice. Written estimate within 48 hours.
Fixed price. Written spec. First sprint guaranteed. In the contract.