UBIKON.ioTech Stack Selector
A recommended stack with honest tradeoffs and a “when not to use this” note — not a generic best-practices list.
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Recommended stack
| Mobile | Flutter |
| Frontend | Next.js (App Router) |
| Backend | FastAPI + PostgreSQL |
| Hosting | Vercel (or equivalent PaaS) |
Rationale
- Mobile: One codebase for iOS and Android cuts build time roughly in half versus two native codebases, at the cost of a thinner ecosystem for bleeding-edge native APIs.
- Frontend: Server Components keep client JS low and SEO strong out of the box, at the cost of a steeper mental model than a plain SPA.
- Backend: A typed API layer over Postgres gives you query power and data integrity a BaaS makes awkward past a few hundred thousand rows.
- Hosting: Zero-ops deployment matters more than infrastructure control before you have production scale problems to justify owning them.
Tradeoffs
- This stack has no unusual tension for your inputs — the main risk is normal execution risk, not a structural mismatch.
When NOT to use this: This stack has no obvious "don't use this" case for your inputs — reconsider if your real constraint is a specific team skillset it doesn't match.
How this recommends a stack
Each layer's recommendation follows from your product type, team size, scale expectation and AI needs — the same tradeoffs a senior engineer would walk you through on a scoping call, made explicit rather than left implicit in a “best practices” list.
Straight answers
What people ask about stack choice
Should I build native or cross-platform? +
Cross-platform with Flutter for most products, and it saves roughly 40% against commissioning separate iOS and Android builds because one codebase and one team covers both. Go native when your product depends on platform-specific hardware or OS integration — advanced camera pipelines, ARKit, health-kit depth, or watch apps. For a booking app, a marketplace, a SaaS companion or an internal tool, native is paying twice for the same result.
Why does Ubikon recommend the same stack so often? +
Because stack novelty is a cost with no upside for most products. Flutter, Next.js, FastAPI and PostgreSQL are chosen for hiring depth and long-term maintainability — you should be able to hand the codebase to any competent team without a rewrite. A stack chosen because it is interesting is a stack your next engineer has to learn on your budget.
What if I already have a stack and a team? +
Then keep it, in almost every case. Rewrites are the most reliably underestimated project in software, and a working system in an unfashionable stack beats a half-migrated system in a modern one. Ubikon works inside existing codebases for AI integration and backend work; the selector is for greenfield decisions, not for justifying a migration.
Will I be locked into your choices? +
No. Everything recommended here is open-source and widely adopted, hosted on infrastructure you own, with full IP transfer on work delivered including source, configuration and documentation. There is no proprietary Ubikon runtime, no per-seat platform fee and nothing that stops another team from taking over.