SaaS Billing Portal Modernization
Simona delivered clean code and a smooth rollout. Communication was clear, and the new billing flows work flawlessly.
Hourly Rate
$30 / Hr
Total Earned
$41,564
Experience
17 Years
Skills
- JavaScript
- TypeScript
- React
- Node.js
- REST API Development
- PostgreSQL
- AWS
- Docker
Senior Full Stack Developer
I am Simona Karenyuk, a full stack developer with over 8 years of experience designing and building modern web applications. I specialize in creating scalable, maintainable solutions across front-end and back-end systems. My work focuses on clean architecture, performance optimization, API integration, and user-focused development. I am comfortable collaborating with cross-functional teams and delivering high-quality results in fast-paced environments. I help businesses turn complex technical requirements into reliable, production-ready software.
Reviews
23 reviews on file.
E-Commerce Checkout Performance Upgrade
Excellent work optimizing our checkout. Pages load faster, bugs were fixed quickly, and the project was completed on time.
Mobile Fitness App Backend
Simona built a stable backend with great API design. She understood our goals and handled deployment without issues.
Custom CRM Workflow Automation
Our sales team loves the new automation. Simona was responsive, detail-oriented, and solved every edge case.
Executive Analytics Dashboard Build
The dashboard is fast, polished, and easy to use. Simona translated complex data needs into a clean product.
AI Document Summarization Tool
Simona created a reliable AI workflow with thoughtful error handling. Great problem solving and clear weekly updates.
Fintech KYC Verification Platform
Security and compliance were handled professionally. Simona wrote quality code and delivered ahead of schedule.
Healthcare Patient Scheduling System
The booking system is intuitive and dependable. Simona communicated well and handled sensitive requirements carefully.
Marketplace Vendor Management Portal
Simona improved our vendor onboarding and admin tools. The codebase is cleaner, faster, and easier to maintain.
Hotel Booking Engine Integration
The integration worked perfectly with our existing stack. Simona was proactive, precise, and great with testing.
Social Community Platform Redesign
Simona delivered a modern, responsive experience. She balanced design details with strong technical execution.
IoT Device Monitoring Dashboard
The real-time dashboard is stable and clear. Simona solved tricky data streaming issues and documented everything.
Retail Inventory Forecasting System
Simona built a practical forecasting tool that our team uses daily. Great architecture and thoughtful implementation.
Logistics Route Optimization API
The API is fast and well structured. Simona handled complex constraints and delivered reliable results.
Education LMS Feature Expansion
Simona added new LMS features without disrupting existing users. Her code quality and communication were excellent.
Real Estate Listing Platform
The platform is polished, searchable, and easy to manage. Simona was dependable and met every milestone.
Restaurant Ordering App Deployment
Deployment was smooth and the app runs reliably. Simona fixed last-minute issues quickly and professionally.
Cybersecurity Audit Reporting Tool
Simona built a clear reporting workflow with secure access controls. Great attention to detail and documentation.
HR Onboarding Portal Development
The portal simplified our onboarding process immediately. Simona was organized, responsive, and easy to work with.
Subscription Video Streaming Platform
Simona improved playback reliability and subscription handling. Strong technical skills and excellent follow-through.
Travel Agency CRM Migration
The migration was completed with no data loss. Simona planned carefully, tested thoroughly, and kept us informed.
Blockchain Wallet Admin Console
Simona delivered a secure and usable admin console. She handled complex requirements with calm professionalism.
Manufacturing Quality Control Analytics
The analytics tool gave us better production visibility. Simona created a robust solution and delivered exactly what we needed.