bai+
Web Platform · B2B
A dealer portal that gives partners real-time visibility into their business.
Visit projectWEB APP DEVELOPMENT
Web app development for platforms, SaaS and internal tools
Devello is a web application development company based in Istanbul. We build fast, secure and scalable web apps, from customer-facing platforms and SaaS products to internal tools. Fixed-scope plans start at $4,499 and run from 3 weeks to 12 weeks.
What you get from our web development team
Responsive, intuitive interfaces
Custom UI/UX design that works on every screen size and is built around what your users need to do.
Architecture that scales
Scalable architecture for growing businesses, including multi-tenant SaaS with user management and billing integrations.
API-driven development
A clean API layer so the web app, mobile clients and third-party integrations all run on the same data.
Secure by default
Modern authentication, user roles and careful data handling, with admin panels and dashboards on the larger plans.
Web app development cost
Every plan covers design, development, testing and deployment. Payments follow delivery milestones, so you pay as we ship.
| Plan | Price | Delivery | What's included |
|---|---|---|---|
| Web Lite | $4,499 | Delivery: 3 weeks | Up to 5 pages · Responsive design · Basic SEO setup · Contact form integration · 1 round of revisions |
| Web Basic | $8,499 | Delivery: 6 weeks | Up to 15 pages · Custom UI/UX design · CMS integration · Authentication & user roles · 2 rounds of revisions |
| Web Pro | $12,499 | Delivery: 12 weeks | Unlimited pages · Full-stack development · Admin panel & dashboards · Third-party integrations · Ongoing support & maintenance |
| Enterprise Web | Custom | Custom timeline | Dedicated development team · Custom architecture & scalability · Enterprise security & compliance · SLA-backed support · Priority feature development |
How a project runs
- 01
Discover
We dig into your goals, users and market to decide what to build and why.
- 02
Design
We turn those goals into flows, prototypes and a visual design aligned with your brand.
- 03
Build
We write clean, tested code in short cycles, with weekly updates and full transparency.
- 04
Launch
We ship to the stores or the web, then track real usage and keep improving.
Frequently asked questions
How much does web app development cost?
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Devello's published web plans are Web Lite ($4,499, 3 weeks), Web Basic ($8,499, 6 weeks), Web Pro ($12,499, 12 weeks). Enterprise Web projects are priced individually.
How long does it take to build a web application?
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Web Lite: 3 weeks. Web Basic: 6 weeks. Web Pro: 12 weeks. Enterprise timelines are set per project.
Which technologies do you use for web apps?
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We work with Next.js, Node.js, Firebase and PostgreSQL, and pick the stack that fits each project.
Do you build SaaS products?
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Yes. We build multi-tenant SaaS products from scratch, covering architecture, user management, billing integrations and onboarding, from MVP to a market-ready product.
What web platforms has Devello built?
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Examples include bai+, a dealer portal that gives partners real-time visibility into their business, and Covira, a dashboard for managing applicants and prospects end to end.
Do you support the product after launch?
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Yes. Pro and Enterprise plans include ongoing support and maintenance. For Lite and Basic we offer support add-ons.
We treat every service like it's our own product.
We don't just deliver services — we build scalable, well-crafted solutions designed to grow with your business. Every project gets the same care and dedication we put into our own products.