SaaS Billing Portal Redesign
Kelsey delivered a clean, reliable billing portal ahead of schedule. Communication was excellent and the code was easy for our team to maintain.
Hourly Rate
$38 / Hr
Total Earned
$49,360
Experience
18 Years
Skills
- JavaScript
- TypeScript
- React
- Node.js
- Python
- REST APIs
- PostgreSQL
- AWS
Senior Mobile App Developer | iOS & Android | Flutter, React Native, Swift, Kotlin | 8+ Years of Experience
I am a Senior Mobile App Developer with over 8 years of experience designing, developing, and delivering high-performance mobile applications for iOS and Android.
I specialize in building scalable, secure, and user-friendly mobile applications, from innovative startup MVPs to complex enterprise-level solutions. My expertise covers the entire mobile development lifecycle, including architecture, UI/UX implementation, backend integrations, deployment, and ongoing optimization.
Core Technical Expertise:
Mobile Development: Flutter, React Native, Swift, SwiftUI, Kotlin, Java, Dart
Platforms: iOS, Android, Cross-Platform Development
Backend & APIs: Node.js, Python, Firebase, REST APIs, GraphQL
Databases: Firebase Firestore, SQLite, PostgreSQL, MongoDB
Cloud & DevOps: AWS, Google Cloud, Docker, CI/CD
Advanced Integrations: Payment Gateways, Push Notifications, Google Maps, GPS, OAuth, Third-Party APIs
App Deployment: Apple App Store, Google Play Store, TestFlight
Specializations: E-Commerce Apps, SaaS Platforms, AI-Powered Applications, Real-Time Systems, Business Automation
I have extensive experience developing sophisticated mobile solutions, integrating complex APIs, optimizing app performance, and building reliable applications that support business growth.
I work closely with clients and cross-functional teams to transform complex requirements into intuitive, production-ready mobile applications.
My focus is on delivering innovative, scalable, and future-ready mobile solutions that solve real business challenges and provide exceptional user experiences.
Reviews
33 reviews on file.
E-commerce Checkout Optimization
Our checkout flow is faster and far less buggy now. Kelsey quickly identified bottlenecks and implemented improvements that lifted conversions.
Healthcare Appointment Booking System
Kelsey built a secure booking system with thoughtful user flows. The work was polished, well tested, and delivered with clear updates throughout.
Fintech Transaction Dashboard
Fantastic work on our transaction dashboard. Kelsey handled complex data states gracefully and produced a responsive, professional interface.
AI Customer Support Assistant
Kelsey integrated the AI assistant smoothly into our support stack. The solution was practical, well documented, and easy for our team to manage.
Mobile Fitness App Backend
The backend was stable, scalable, and delivered on time. Kelsey made smart architecture choices and communicated tradeoffs clearly.
CRM Lead Management Upgrade
Kelsey modernized our CRM workflow without disrupting sales operations. The new lead tools are faster, cleaner, and much easier to use.
Marketplace Vendor Onboarding Flow
Kelsey created a smooth onboarding experience for vendors. The implementation was thoughtful, reliable, and completed with impressive attention to detail.
IoT Device Monitoring Platform
Excellent job building our monitoring platform. Kelsey handled real-time device data efficiently and kept performance solid under load.
Analytics Reporting Web App
Kelsey transformed our reporting process with a sharp, intuitive web app. The charts load quickly and the data filters work exactly as needed.
Restaurant Reservation Management Tool
The reservation tool exceeded expectations. Kelsey understood our operational needs and delivered a simple, dependable system.
Social Community Mobile Features
Kelsey added new social features with clean UX and strong performance. Bugs were handled quickly and updates were always clear.
Real Estate Listing Portal
Our listing portal is now much faster and easier to search. Kelsey wrote clean code and guided us through deployment smoothly.
Logistics Route Planning Dashboard
Kelsey built a practical dashboard that our dispatchers love. The routing tools are accurate, responsive, and easy to understand.
Education LMS Content Migration
Kelsey managed a complex LMS migration with almost no downtime. The process was organized, careful, and completed right on schedule.
Subscription Video Streaming Platform
Great technical execution from planning through launch. Kelsey improved playback reliability and built a clean subscription management flow.
Travel Booking API Integration
Kelsey integrated multiple travel APIs and handled edge cases very well. The final booking flow is stable, fast, and user friendly.
Cybersecurity Audit Remediation Project
Kelsey helped us close critical security gaps quickly. The fixes were well explained, properly tested, and implemented without disruption.
Inventory Management SaaS Module
The inventory module is exactly what we needed. Kelsey delivered clean architecture, strong validation, and a smooth admin experience.
Banking KYC Workflow Automation
Kelsey automated our KYC workflow with precision and care. The new process saves hours each week and includes excellent error handling.
Telemedicine Patient Portal
Kelsey delivered a secure, accessible patient portal with great attention to detail. Communication was consistent and the launch went smoothly.
Retail POS Cloud Sync
Our POS data now syncs reliably across stores. Kelsey solved tricky conflicts and built a dependable cloud sync process.
HR Performance Review Platform
Kelsey built a polished review platform that managers adopted quickly. The interface is clear, and the permissions logic works perfectly.
Construction Project Tracking App
Kelsey understood our field workflows and built an app that crews actually use. Delivery was timely and the system is very stable.
AI Document Classification Tool
The classification tool performs better than we expected. Kelsey handled model integration, UI, and deployment with real professionalism.
Nonprofit Donation Management System
Kelsey created a donation system that is simple for staff and donors. The payment flow is secure, smooth, and well documented.
Gaming Leaderboard Backend Service
Kelsey built a fast leaderboard service that handles spikes without issue. The API is clean, reliable, and easy to extend.
Manufacturing Quality Control Dashboard
The dashboard gives our team clear visibility into quality metrics. Kelsey translated complex requirements into a clean, useful product.
Legal Case Management Portal
Kelsey delivered a secure portal with excellent document handling and permissions. The project was organized and completed with minimal revisions.
Automotive Service Scheduling App
Our scheduling app is faster and much easier for customers to use. Kelsey handled the build professionally from start to finish.
Cloud Infrastructure Cost Optimization
Kelsey reduced our cloud spend while improving reliability. The recommendations were practical, and the infrastructure changes were carefully deployed.
Food Delivery Merchant Console
Kelsey built a merchant console that is intuitive and dependable. Restaurant partners can now manage menus, orders, and hours with ease.
Enterprise API Gateway Migration
Kelsey led the API gateway migration smoothly and without downtime. The documentation was clear, and performance improved noticeably after launch.