Website & Web App Development
Admin, Booking, Payment, Dashboard
Admin panels, booking systems, payment integration, dashboards — we build custom web apps tailored to your business, from requirements to deployment.
8 Types of Web Apps We Build
From admin panels to e-commerce platforms, we cover every business web app your team needs.
Admin Panel
Back-office for content, users & orders
Booking & Scheduling
Online booking, calendar & auto-notifications
Payment & Settlement
PG integration, subscriptions & settlement reports
Dashboard & Reports
Real-time KPIs, charts & data visualization
Membership & Users
Membership tiers, points & subscription management
CMS
Blog, page builder & media editor
Internal Tools
Inventory, HR, project management & more
E-Commerce
Product catalog, cart, order & shipping tracking
Technology We Use
Modern, proven technologies for reliable and scalable web applications.
* Technology choices are tailored to each project's specific requirements and scale.
What Affects Timeline & Cost
These 6 factors determine the scope, timeline, and cost of your web app project.
Number of pages
More screens mean proportionally more design and development effort.
Feature complexity (payment/notifications/permissions)
Payment integration, notification systems, and role-based permissions add complexity and time.
Number of API integrations
Each external service (PG, SMS, email, social login) increases integration scope.
Design level (custom vs template)
Pixel-perfect custom design requires 2-3x the effort compared to template-based.
Responsive / PWA
Mobile/tablet responsiveness and PWA features (offline/push) extend development scope.
Maintenance scope
Post-launch bug fixes, feature additions, and monitoring contracts affect total cost.
What You Receive
Every project includes these core deliverables at no extra charge.
Full source code
Frontend, backend & DB schema delivered via Git repository.
Server deployment
Deployed to production on AWS/Vercel and ready to use.
Admin manual
Documentation for admin panel usage, content editing, etc.
Operations guide
Includes deployment procedures, backup methods & incident response.
Budget & Timeline Reference
Indicative ranges based on past projects. Actual quotes depend on your specific requirements.
Small Website
Examples: Company intro, portfolio, landing page
Mid-size Web App
Examples: Booking system, membership, CMS, admin panel
Large Platform
Examples: E-commerce, SaaS, multi-role platform, real-time dashboard
* All prices in KRW. VAT not included. Free preliminary consultation available.
Get an accurate quote for your project →Recent Projects
A selection of web app projects we have recently delivered.
Corporate Portfolio Site
Responsive corporate website with SEO optimization, CMS, multilingual support, and inquiry form integration for global client outreach.
Booking & Payment Management
All-in-one booking platform with real-time calendar, Toss payment integration, automated SMS/email confirmations, and an admin dashboard.
Data Collection + Reporting Dashboard
Internal dashboard that auto-collects data from external APIs, provides filters, period comparison, charts, automated daily/weekly reports, and Slack notifications.
Frequently Asked Questions
Common questions about our web app development process, pricing, and deliverables.
Is an admin panel included?
Yes, most web app projects include a custom admin panel. We build features like content management, user management, order/booking management, and analytics views. Role-based access levels (super admin, admin, editor, etc.) are also available.
Can you integrate payment, SMS, and email APIs?
Yes, we integrate with payment gateways (Toss Payments, Stripe), SMS APIs (Twilio, Aligo), email services (AWS SES, SendGrid), social login (Kakao, Naver, Google), and map APIs (Kakao Maps, Google Maps).
Can you handle site renewal and data migration?
Yes, we analyze your existing site, propose a renewal plan, and handle full database migration. We have experience migrating from WordPress, Cafe24, and other platforms, ensuring data integrity throughout the process.
Do you support responsive design and PWA?
Yes, all projects are responsive (mobile/tablet/desktop) by default. Adding PWA gives users installable app-like experiences without app stores, including offline mode and push notifications.
Who handles hosting and deployment?
We handle the initial deployment on AWS/Vercel/Cloudflare, including domain connection, SSL certificates, and CI/CD pipeline setup. Ongoing operations and maintenance are available through a separate agreement.
Do you handle design too?
Yes, we provide end-to-end UI/UX design and development. If you have existing mockups (Figma, XD, Sketch), we implement them. Otherwise, we design together from wireframes. Template-based fast-track options are also available.
Can I make changes after completion?
Yes, we build CMS features so you can edit content (text, images, products) directly from the admin panel. Structural changes or new features requiring code modifications are supported through maintenance contracts.
Who owns the source code?
After project completion and final payment, full source code ownership transfers to you. We provide Git repository transfer, deployment environment handover, and complete technical documentation.
What are the maintenance contract options?
We offer 1 month of free warranty after launch, followed by optional monthly maintenance contracts. Critical issues: within 4 business hours. General requests: 1-2 business days. Includes monitoring, backups, security patches, and minor feature additions.
Do you support multilingual (i18n) websites?
Yes, we build multilingual websites supporting Korean, English, Japanese, Chinese, and more. We provide next-intl-based routing, SEO optimization (hreflang tags), and per-language content management. Auto-translation API integration is also available.
Start Your Web App Project
From requirements to deployment, we handle everything. Describe your project and get a free estimate within 24 hours.
Freesi is a platform that supports the entire outsourcing process — from entering requirements, receiving AI-powered estimates, to contract and milestone management — for web development, RPA, crawling, API integration, and GPT chatbot projects.