SaaS Billing Automation Platform
Sofia delivered a clean, reliable billing workflow ahead of schedule. Her communication was excellent and the code was easy for our team to maintain.
Hourly Rate
$29 / Hr
Total Earned
$20,331
Experience
16 Years
Skills
- JavaScript
- TypeScript
- React
- Node.js
- Python
- REST APIs
- AWS
- PostgreSQL
Recruitment Matching AI Prototype
I am Sofia Kowalski, a full stack developer with over 8 years of experience designing, building, and maintaining modern software solutions. I specialize in creating scalable web applications, robust APIs, and cloud-native systems for startups and growing businesses. My work focuses on clean code, performance optimization, security, and delivering products that are easy to maintain. I have strong experience collaborating with cross-functional teams and turning business requirements into reliable technical solutions. I am committed to clear communication, efficient delivery, and long-term client success.
Reviews
32 reviews on file.
E-Commerce Checkout Optimization
She quickly identified the bottlenecks in our checkout and improved conversion flow. The deployment was smooth and well documented.
Healthcare Appointment Booking System
Sofia built a secure and intuitive booking system for our clinic. She handled edge cases carefully and kept us updated throughout.
Fintech Risk Dashboard Integration
Outstanding work integrating multiple data sources into a fast dashboard. Sofia asked smart questions and delivered production-ready code.
Mobile Fitness App Backend
The backend Sofia created was stable, scalable, and well structured. She was responsive and solved issues before they became blockers.
Real Estate Marketplace Upgrade
Sofia improved search, filters, and listing performance across our marketplace. Her attention to detail made a clear difference.
AI Customer Support Tool
She implemented the AI workflow exactly as requested and improved our original design. Great communication and very professional delivery.
CRM Pipeline Customization Project
Sofia customized our CRM to match our sales process perfectly. The automation saved our team hours every week.
IoT Device Monitoring Portal
The monitoring portal was delivered with a clean architecture and dependable alerts. Sofia handled complex device data with ease.
Restaurant Delivery Ordering Platform
Sofia built a fast and user-friendly ordering flow. She met every milestone and handled payment integration without issues.
Analytics Dashboard for Marketing Team
She transformed messy reporting requirements into a clear analytics dashboard. The final product was fast, polished, and accurate.
Social Networking App API
Sofia designed a solid API for our social app and documented everything clearly. Her work made frontend integration much easier.
Travel Booking Engine Refactor
She refactored a fragile booking engine into a cleaner and more reliable system. Excellent problem solving under a tight deadline.
EdTech Learning Management Portal
Sofia delivered a modern LMS portal with thoughtful UX and strong backend logic. She was organized, proactive, and easy to work with.
Subscription Video Platform Migration
The migration was handled carefully with no downtime for our users. Sofia planned every step and communicated risks clearly.
Logistics Route Planning Dashboard
Sofia created a practical route planning dashboard that our dispatchers love. The performance improvements were impressive.
HR Onboarding Workflow Automation
She automated our onboarding tasks and integrated them with existing tools. The result was reliable, simple, and well documented.
Cybersecurity Compliance Reporting Tool
Sofia built a secure reporting tool that passed our internal review. Her code quality and attention to permissions were excellent.
Marketplace Vendor Management System
She delivered a complete vendor management system with clean workflows. Sofia was responsive, precise, and dependable.
Banking API Integration Project
Sofia integrated the banking APIs securely and handled complex error states well. Everything was tested thoroughly before launch.
Inventory Management Web Application
The inventory app was delivered on time and worked exactly as expected. Sofia suggested useful improvements we had not considered.
AI Document Processing Pipeline
Sofia built a smart document pipeline that reduced manual review time significantly. Her implementation was clean and scalable.
Event Ticketing Platform Launch
She helped us launch a ticketing platform with strong payment and attendee flows. Sofia stayed calm and effective under launch pressure.
Telemedicine Patient Portal Redesign
Sofia redesigned our portal with better navigation and secure patient workflows. The final result was polished and reliable.
B2B Procurement SaaS Module
She built a procurement module that fit neatly into our SaaS product. The code was modular, tested, and easy to extend.
Retail POS Reporting Integration
Sofia connected our POS data to reporting tools without disrupting operations. She was thorough and very clear in communication.
Insurance Claims Management Portal
The claims portal was delivered with excellent workflow logic and clean UI. Sofia understood our business rules quickly.
Cloud Deployment Automation Setup
Sofia automated our deployments and reduced release errors immediately. Her documentation made handoff simple for our engineers.
Food Subscription Mobile App
She built the app backend and subscription logic with great reliability. Sofia was fast, thoughtful, and easy to collaborate with.
Manufacturing Quality Control Dashboard
Sofia created a real-time dashboard that helped our managers spot issues faster. The system has been stable since day one.
Nonprofit Donation Platform Upgrade
She upgraded our donation platform and improved payment reliability. Sofia was patient, professional, and highly detail oriented.
Recruitment Matching AI Prototype
Sofia built a strong AI prototype for candidate matching in a short timeframe. Her technical judgment and communication were excellent.