App Development
A purpose-built web app for your small team — spec, prototype, build, launch.
A custom app build for small teams. We start with a free chat to confirm an app is the right answer, write a tight spec, prove the riskiest flow with a clickable prototype, then build a hardened production app with auth, data, integrations, tests, and monitoring. Web-first with mobile-friendly responsive design.
Concrete artifacts you keep.
Every line below ships during the engagement. No “TBDs”, no slide-deck hand-waving — working code, written docs, and dashboards your team owns.
The outcome, not just the output.
- A live, custom web app your team and customers can use
- A spec, a prototype, then a real production app — in that order
- Tests, monitoring, and a runbook so the app survives without me
- Mobile-friendly responsive design out of the box
How the engagement runs.
Free intro chat
A 20-minute call to decide whether an app is the right answer at all and which scope fits.
Spec & price
A short product spec capturing users, jobs, screens, data model, and milestone-based pricing.
Working prototype
A clickable prototype proves the core flow before we invest in the full build.
Production build
Real app build — auth, database, UI, integrations, tests, monitoring, observability.
QA & polish
Cross-device QA, accessibility, performance, and a security pass before launch.
Launch & handoff
Production cutover with a rollback plan, monitoring alerts, and a runbook your team can run.
Related case studies
Nexural — Full-Stack Fintech Platform
A production-grade trading platform with real-time execution, portfolio tracking, a Discord-native AI companion, and Stripe billing.
Read case study Case studyJobpoise — AI Job Copilot
A citation-grounded AI job application copilot with Chrome extension, Gmail tracking, and three pricing tiers.
Read case studySee the artifact, not the marketing.
Real shape, redacted content. Pick a tab to preview what ships.
Twelve-page audit excerpt: scope, methodology, findings ranked by impact, and a prioritized fix list. Redacted.
Sample provided after intro call · ask sage@sageideas.dev
Money-back if you're not happy in week 1
Reset the engagement before momentum builds. No invoices to dispute, no awkward email.
Async-first, weekly demos, no surprises
You see exactly what shipped each week. No status meetings to attend, no reports to chase.
Code is yours from day 1 — no lock-in
Your repo, your infra, your accounts. We work in your stack. You can take the work in-house at any time.
“Cut our flake rate from 12% to 0.4% in three weeks. The eval suite caught two regressions on day one of running in CI.”
Common questions
- Why does the price start at $6,500?
- Real apps need auth, data, tests, and monitoring on day one — not after launch. The starting price covers a tight scope with those baked in. Bigger apps quote higher; small internal tools may quote lower.
- Web app or native app?
- Web-first. Modern web apps install to home screens, work offline, and ship 10x faster than native. If you genuinely need native, I will say so on the intro call and refer out.
- Can you take over an existing app?
- Yes — start with Sage Audit ($750) so I understand the codebase, then we scope a continuation engagement honestly.
- What if my idea is too small for $6,500?
- Then it might be a Ship (marketing site), an Automate (one workflow), or a Build (broader engagement). The free intro chat is the fastest way to find out.
Ready to scope App Dev?
A 30-minute call to confirm fit, scope, and timeline. No pressure, no slides.
Average reply: 3 hours, business days