Javascript, Typescript, React.js, Next.js & Node.js Expert
I help B2B founders and product teams build and launch production-ready web and mobile applications with advanced AI capabilities, including RAG pipelines, LLM integrations, AI agents, and intelligent automation. My expertise spans the full stack, using React, Next.js, Node.js, Python, and Laravel to deliver scalable, high-performance products.
8+ Years
Experience in building software
100% JSS
Job Success Score on Upwork
$200K+
Total earnings on Upwork
Top Rated Plus
Upwork talent badge
People say
"Exceptional excellent freelancer!"
Tal Barmeir
CEO, BlinqIO
Client fit
Legacy Codebase Rescue
Existing code has become hard to manage, slowing development, bug fixes, and new feature delivery.
Full-Stack from Scratch
Building products from scratch with high standards across frontend, backend, database, and architecture.
React / Next.js Migration
Migrating web apps from legacy technologies to modern React.js and Next.js stacks.
Complex Feature Delivery
Delivering complex features the current team can't handle — on time and production-ready.
Performance Optimization
Eliminating performance bottlenecks that hurt user experience and conversion rates.
Analytics & Visibility
Adding visibility into user behavior, drop-off points, and product usage with proper tracking.
MVP to Production
Turning a Figma file, idea, or screenshot into a scalable B2B SaaS MVP ready for real users.
Customer-First Engineering
Working with engineers who understand real customer problems — not just technical requirements.
My process
Fast Response & Daily Calls
Quick response times to keep projects moving — I join daily meetings via video call to stay fully in sync.
Daily Progress Updates
Daily GitHub commits and short video demos so you always see real progress, never just promises.
Weekend Availability
Available on weekends when needed for urgent issues, critical bugs, or tight launch deadlines.
Your Time Zone
Comfortable working in your preferred time zone — no delays waiting for cross-timezone replies.
Long-Term Partnership
I stay past the contract. Long-term support, new features, and ongoing collaboration as your product grows.
Zero Surprise Communication
Clear, honest updates with no hidden delays. If something's blocked, you hear about it immediately.
How I help
Full-Stack SaaS Development
Build MVPs, B2B SaaS platforms, and web applications from idea to production with modern architecture and clean code.
- ✓Frontend development with Next.js, React, and TypeScript
- ✓Backend development with Node.js, Python, Laravel, Supabase, PostgreSQL, MongoDB, and MySQL
- ✓Authentication, payments, subscriptions, and user management
- ✓Multi-tenant web applications with role-based access control and Supabase Row Level Security (RLS)
- ✓CMS, CRM, and third-party API integrations
- ✓Cloud deployment, monitoring, and scalable infrastructure
AI & RAG Systems
Design and build production-ready AI systems that deliver accurate, context-aware responses using modern RAG architectures.
- ✓Custom RAG pipelines with embedding, chunking, and retrieval optimization
- ✓Vector database integration (Pinecone, Weaviate, pgvector, Chroma)
- ✓Hybrid search, re-ranking, and query expansion for higher accuracy
- ✓Evaluation, monitoring, and quality testing for reliable AI outputs
LLM Integration & AI Agents
Integrate OpenAI, Anthropic, Gemini, or open-source models into your product with scalable agent workflows.
- ✓Structured outputs and function calling with schema validation
- ✓Multi-step AI agents and workflow automation
- ✓Prompt engineering for reliable and consistent responses
- ✓Cost, latency, and model performance optimization
Domain, Deployment & SSL
Take your project from code to live — fully configured, secured, and ready for production traffic.
- ✓Domain registration, DNS configuration, and custom subdomain setup
- ✓SSL/TLS certificate provisioning and auto-renewal (Let's Encrypt, Cloudflare)
- ✓CI/CD pipelines with GitHub Actions, Vercel, Railway, or AWS
- ✓Environment setup, secrets management, and zero-downtime deployments
Selected work
BlinqIO - AI powered test automation B2B SaaS
AI-powered test automation B2B SaaS that generates and maintains end-to-end Playwright tests. Served as Senior Lead Full-Stack Engineer across the web app, Electron desktop app, web recording tool, and admin panel — owning frontend architecture, backend APIs, and microservices.
Key Contributions
- Built multi-tenant architecture where all UI data dynamically updates based on the selected project context
- Built drag-and-drop folder management to organize tests folder-wise for structured navigation
- Reduced page load times by 30% through performance optimization and code-splitting
- Increased user engagement by 40% with improved user experience and analytics-driven enhancements
- Reduced production issues by 70% through better code quality and testing practices
- Improved development speed by 70% by streamlining workflows and engineering processes
30%
Faster Load Times
40%
Higher User Engagement
70%
Fewer Production Issues
70%
Faster Development Velocity
MedNota — Healthcare Quality & Patient Safety Platform
Swiss healthcare technology platform helping hospitals track patient outcomes, monitor infections, and streamline regulatory reporting. Served as Senior Full-Stack Engineer owning complex clinical workflows — JSON schema–driven forms, BPMN patient flows, drag-and-drop builders, and data-rich dashboards.
Key Contributions
- Implemented role-based access control with distinct permissions for admins, clinicians, and staff
- Implemented dynamic JSON schema-driven forms, enabling new form configurations without any code changes
- Empowered hospital staff to manage and customize clinical forms independently, without developer involvement
- Enabled drag-and-drop patient workflow builder for admins to arrange and manage treatment completion stages
- Improved frontend performance significantly for large-scale patient datasets
- Reduced code complexity and increased maintainability across modules
- Enabled multi-language support for wider accessibility
- Delivered data-rich dashboards for better clinical decision-making
- Streamlined workflow automation using BPM integration
Zero-Code
Form Management for Hospitals
Large-Scale
Patient Datasets Handled
Multi-Lang
Accessibility Enabled
BPM
Workflow Automation
Multi-calendar aggregation and booking platform combining unified calendar management with Calendly-style scheduling. Served as Senior Full-Stack Engineer delivering calendar views, booking flows, team assignment, and Stripe integration with real-time WebSocket sync.
Key Contributions
- Implemented role-based access control for admins, team members, and guests with scoped permissions
- Built unified multi-calendar view aggregating events from multiple sources into a single dashboard
- Implemented Calendly-style booking management — one-on-one, group, and round-robin bookings with shareable links, availability rules, and seamless scheduling flows
- Integrated Stripe for subscription billing and payment processing
- Collaborated on complex backend logic for timeslot calculation and conflict resolution
- Enabled real-time booking state sync using WebSockets
Multi-Cal
Calendar Aggregation
2-Way Sync
Booking & Calendar Sync
Stripe
Payments Integrated
Real-Time
WebSocket Sync
Live in production
Real products shipped and running in production — click any card to visit the live site.
PROVIA
Full-stack web application — modern UI built with React & Next.js.
Full-Stack02MedNota
Complex SaaS Swiss healthcare platform for patient outcomes & regulatory reporting.
Healthcare SaaS03LineTweet
B2B platform unifying store operations, employees, and customers in one place.
B2B SaaS04BlinqIO
B2B AI-powered test automation platform generating end-to-end Playwright tests.
B2B · AI05Calen360
Booking, calendar, and task management SaaS platform — Calendly-style scheduling.
SaaS06DocsTime
Doctor-patient appointment management system streamlining healthcare scheduling.
HealthTech07AeroSimple
B2B airport management platform for operations, compliance, and safety tracking.
B2B · Enterprise08SwiftCoreTech
Contributed to multiple products — Equature, PMS, and Vibewith.
Multi-Product09M1neral
Energy industry enterprise software platform — B2B SaaS for capital markets.
B2B · Enterprise10A+ Testing
Education platforms for teachers and students — test creation and management.
EdTech11FooMan
Magento eCommerce development tools and extensions provider.
eCommerce12Kaiju.ai
AI-powered quantitative trading and investment platform in capital markets fintech.
AI · FinTech13SecureTradeClub
Collector-focused trading marketplace platform for authenticated transactions.
MarketplaceToolbox
Frontend
Backend
Databases
AI & ML
Integrations
Cloud & DevOps
AI Tools