Good software, built for what it should cost.
Seventin pairs senior engineers with AI-assisted workflows to design, build, and ship web and mobile products — in weeks, not quarters, at a fraction of typical agency rates.
No sales calls required to get a real number — see it below.
// seventin / build.ts
import { defineProduct } from "@seventin/sdk";
export const checkout = defineProduct({
name: "Pro Plan",
price: 2900,
});
deploy(checkout); // ~40s
One team, the whole build.
From a first prototype to a production system your users depend on — same team, same AI-augmented process, throughout.
Web Applications
Customer dashboards, internal tools, and SaaS products — built and deployed as a working product, not a mockup.
React · Next.js · Node · PostgreSQLMobile Apps
Native-feel iOS and Android apps from a single codebase, ready for the App Store and Play Store.
React Native · Swift · KotlinAI Features & Integration
Add AI where it earns its place — search, support, generation, automation — wired into your existing product.
GPT-class models · RAG · Vector searchMVP Sprints
A scoped, fixed-price sprint that turns an idea into a clickable, testable product in weeks.
Prototyping · Usability testingOngoing Engineering
A senior engineer, plus AI tooling, embedded in your roadmap for continuous features and upkeep.
Monthly retainer · Async standupsModernization
Legacy systems rebuilt on a stack that's cheaper to run and easier to extend.
Migration · Refactor · Cloud infraWhy this costs less than you'd expect
Traditional agencies price for hours spent. We price for outcomes shipped — and AI removes a lot of the hours.
AI writes the first draft
Engineers direct AI tools to generate scaffolding and first-pass implementations, then review and refine — cutting hours nobody should have to bill you for.
Tests run continuously
Automated test generation and AI-assisted code review catch issues while they're still cheap to fix, not after launch.
We reuse what works
A library of vetted components means common features — auth, billing, dashboards — don't get rebuilt from scratch every time.
How a project actually runs
Four stages, the same way every time — so you always know what's next and what it costs.
Scope
We turn your idea into a fixed-price spec in a single working session — what's built, what it costs, when it ships.
Build
Engineers and AI tooling build in short cycles, with a working preview you can click through every week.
Review
Every commit gets an automated test pass and a human review before it reaches your preview link.
Ship
We deploy, hand over clean documentation and full code ownership, and stay on call for the first weeks live.
Pricing that fits on one screen
No hourly billing surprises. Pick a starting point — we'll scope the exact number on a first call.
A focused two-week sprint to design and build a single feature or prototype.
- Fixed scope & price
- Working preview each week
- Source code, fully yours
- One round of revisions
A complete web or mobile product, from design through launch, in four to six weeks.
- Everything in Sprint
- Full product design
- AI-reviewed, tested codebase
- 30 days of post-launch support
An embedded engineer plus AI tooling on your roadmap, month to month.
- Everything in Build
- Dedicated engineer
- Cancel anytime
- Priority turnaround
Final pricing depends on scope — these are typical starting points for projects like yours.
Good questions, answered plainly
If it's AI-assisted, who's actually responsible for the code?
Our engineers are. AI drafts and assists; every line that ships has been reviewed, tested, and is understood by a person on the team who can support it.
Is AI-built software lower quality?
Not when it's reviewed properly. We use AI to remove repetitive work, not judgment — architecture, security, and design decisions are made by engineers.
What if I don't know exactly what I need yet?
That's what the scoping session is for. We'll help turn a rough idea into a fixed-price spec before any code gets written.
Do I own the code?
Yes, entirely. You get the full repository and documentation at handoff — no lock-in, no ongoing license fees.
Tell us what you're building.
Two or three sentences is enough to start. We'll reply with next steps within one business day.