Top App & Web Developers in Seoul
Seoul's trusted software development partner. We build high-performance mobile apps and web platforms for South Korea's gaming, fintech, and super-app ecosystems.
According to CompTIA's 2026 State of the Tech Workforce report, U.S. tech employment grew by over 200,000 jobs in 2025. App369 has delivered 150+ projects with a 98% client satisfaction rate, serving businesses in Seoul and beyond with custom mobile apps, web platforms, and enterprise software.
Why Seoul Businesses Choose App369
According to Deloitte's 2026 Technology Industry Outlook, businesses that invest in custom software achieve 20-30% higher operational efficiency. Here is why Seoul companies partner with App369.
Serving Seoul, Pangyo Techno Valley, Incheon, and the Seoul Capital Area — home to 25M+ people
Deep expertise in gaming (Nexon, NCSoft, Krafton ecosystem), fintech, and super-app platforms — Korea's gaming industry generated $15B+ in 2025 (KOCCA)
Development optimized for Korea's 97% smartphone penetration rate and 5G-first mobile culture
Understanding of Korean business practices including PIPA (Personal Information Protection Act) compliance and KRW payment integrations
Software Development Services in Seoul
From Pangyo Techno Valley to the Samsung/Kakao ecosystem in Gangnam, we deliver software built for Korea's ultra-connected, mobile-first market. According to Statista, the global custom software development market is projected to reach $234 billion by 2026, reflecting growing demand for tailored solutions over off-the-shelf products.
Mobile Apps
Native iOS and Android apps built with Flutter for 40% faster time-to-market, according to Google Developer data. From concept to App Store launch.
Web Development
High-performance websites and web applications. Per Google research, 53% of mobile users leave sites that take over 3 seconds to load -- our builds target sub-2-second load times.
Custom Software
Enterprise solutions engineered to scale. According to McKinsey, companies that invest in custom enterprise software see up to 25% productivity gains within the first year.
Our 4-Phase Development Process
According to the Standish Group CHAOS Report, Agile-based projects are 28% more successful than traditional approaches. Our structured four-phase process keeps Seoul projects on time and on budget.
Discovery
Understanding your vision, goals, and market requirements through stakeholder interviews and competitive analysis.
Design
Creating intuitive UI/UX with interactive prototypes. Per Forrester Research, well-designed UX can yield conversion rates up to 400% higher.
Development
Building with Flutter, Vue.js, Node.js, and GCP using 2-week Agile sprints with weekly milestone reviews.
Launch
Deployment to production with 24/7 monitoring and ongoing maintenance. According to Gartner, proactive support reduces total cost of ownership by 30%.
Frequently Asked Questions
How long does a typical project take?
Based on App369's delivery data from 150+ completed projects, typical timelines for Seoul clients are: websites 4-8 weeks, web applications 2-4 months, mobile apps 3-6 months. According to Clutch, the average software development project takes 4.5 months. Our structured four-phase process (discovery, design, development, launch) keeps Seoul projects on schedule with weekly milestone reviews.
Do you provide ongoing support?
Yes. According to Gartner research, organizations that invest in ongoing maintenance reduce total cost of ownership by 30%. Our Seoul clients receive comprehensive maintenance packages that include bug fixes, OS updates, security patches, and performance optimization. We maintain a 98% client satisfaction rate across 150+ projects, with dedicated support aligned to the KST timezone.
What's your pricing model?
App369 uses project-based pricing with a transparent 50/50 payment structure: 50% upfront, 50% on completion. According to GoodFirms, project-based pricing is preferred by 67% of businesses for custom software development. For Seoul businesses, this model eliminates scope creep risk and provides clear budget predictability from day one.
Can you work with existing projects?
Yes. Over 35% of our 150+ projects involve working with existing codebases. For Seoul businesses with legacy systems, we offer comprehensive code audits, bug fixes, feature additions, and full-stack migrations. According to McKinsey, 70% of digital transformations involve modernizing existing systems rather than building from scratch.
Szymon Dziak
As founder of App369, I personally oversee every project we take on. With 12+ years in software development and 150+ projects delivered across 24+ cities, I ensure your project gets the attention and expertise it deserves. Based in South Florida, we serve clients across Seoul and nationwide with a 98% satisfaction rate verified on Clutch.