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You will get Expert MERN Stack Developer | Node.js, React, MongoDB, Full-Stack Solutions

Oleksii T.Status: Offline
Oleksii T. Oleksii T.
Rising Talent
Preview image

Let a pro handle the details

Buy Custom Website Programming services from Oleksii, priced and ready to go.
Oleksii T.Status: Offline
Oleksii T. Oleksii T.
Rising Talent
Preview image

Let a pro handle the details

Buy Custom Website Programming services from Oleksii, priced and ready to go.

Project details

Get a scalable full-stack web application built with MongoDB, Express.js, React, and Node.js, tailored to your business requirements. You’ll receive custom frontend and backend development, REST API integration, database architecture, authentication, third-party integrations, and performance optimization for a production-ready application.

❗️ Before purchasing this project, please send your project requirements via Upwork Direct by visiting my profile so I can review your scope and recommend the best development approach. 📞

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Programming Languages
PHP, Python
Coding Expertise
Cross Browser & Device Compatibility, Localization, Performance Optimization

What's included $499

These options are included with the project scope.

$499
  • Delivery Time 3 days
  • Number of Revisions 0
Oleksii T.Status: Offline

About Oleksii

Oleksii T.Status: Offline
Full Stack Developer | Backend Developer | SaaS Platform Developer
Kotsyubynske, Ukraine - 3:13 am local time
📩 Send me your project details – I'll reply within a few hours with a practical technical breakdown.
👋 Hi there, I'm Oleksii! Got a SaaS platform, a web application, or an API-heavy product that needs to be fast, stable, and built to scale?
🏆 Why My Full Stack & SaaS Development Stand Out
12+ years working as a Senior Full Stack Developer, Backend Developer, SaaS Platform Developer & Web Developer
200+ Web Development, SaaS Development and API Development projects delivered
Trusted as a go-to Full Stack Developer & Backend Developer by US and EU product teams
50+ SaaS platforms, web apps and custom dashboards shipped to production
30+ high-load integrations built – Stripe, CRM, ERP, AI & third-party APIs
Backend Development cutting server response time up to 10×
SaaS Platform Developer expertise scaling products from MVP to 100K+ users
API Development & system integrations automating 70% of manual workflows
Ecommerce Web Development lifting checkout conversion 30%+
Database architecture & optimization reducing infrastructure costs 40%
Next.js & React Web Development hitting 90+ PageSpeed scores

I'm a Senior Full Stack Developer, Backend Developer, Node.js Developer, PHP Developer and Web Development expert who architects, builds and optimizes every layer – from database schema and REST API to pixel-perfect frontend. As a SaaS Platform Developer with a backend-first process, I cover Web Development, Web Application Development, API Development, Backend Development and Custom Software Development for SaaS, dashboards, CRM systems, Ecommerce platforms and marketplaces.

⭐️⭐️⭐️⭐️⭐️ "The platform runs flawlessly under load, and the codebase is clean and easy to extend. Exactly the Full Stack Developer we needed – delivered on time and communicated clearly at every step."

🚀 Full Stack & Backend Development Services

📌 SaaS Platform Development – From MVP to Scale
Full-cycle SaaS Development as your dedicated SaaS Platform Developer – architecture, multi-tenancy, subscriptions & billing (Stripe)
Backend Development with Node.js, PHP & scalable database design (MySQL, PostgreSQL, MongoDB)

📌 Web Application Development (React & Next.js)
Custom Web Application Development by a hands-on Full Stack Developer – dashboards, admin panels & client portals
Next.js Development with SSR/ISR for speed, SEO and Core Web Vitals

📌 API Development & Integrations
REST API Development, third-party API integration & webhook automation
CRM, ERP, payment & AI API integrations as a dedicated Backend Developer

📌 Ecommerce & Headless Web Development
Headless WordPress + Next.js and Shopify Web Development
Performance optimization & Conversion-focused Ecommerce Development

📌 DevOps, Security & Maintenance
CI/CD pipelines, Docker, server setup & zero-downtime deployment handled end-to-end by a senior Backend Developer
Security hardening, monitoring, refactoring & long-term SaaS maintenance

🔧 Process, Tech-Stack & Delivery
Discovery & Technical Audit – requirements analysis, architecture planning and tech-stack selection to set the right Web Development direction.
Architecture & Database Design – as a Backend Developer I design scalable schemas, clean API contracts and documentation so the product grows without rewrites.
Backend & Frontend Development – as a Full Stack Developer I ship clean, tested code: Node.js / PHP Backend Development plus React / Next.js frontend, ready for production.
API Development & Integrations – REST APIs, webhooks and third-party services wired into one reliable system.
Testing, Deployment & Support – automated tests, CI/CD, monitoring and post-launch support so every release is stable and data-backed.

🏦 Fintech platforms & secure payment systems
🏥 Healthtech portals & HIPAA-minded work by an experienced Backend Developer
🛒 Ecommerce Web Development with high-converting checkout
📈 SaaS Platform Development & legacy web app modernization led by a senior SaaS Platform Developer
🏗 Real Estate, EdTech, AI, Logistics, Crypto & Web3 platforms

⚙️ Tools
Node.js · Next.js · React · TypeScript · PHP · WordPress (Headless) · MySQL · PostgreSQL · MongoDB · REST API · Stripe · Docker · AWS · CI/CD · Git · AI-powered development workflows

🚀 Looking for a Full Stack Developer, Backend Developer, Web Developer, Node.js Developer, PHP Developer or SaaS Platform Developer for your SaaS, web application or API-driven product? As a SaaS Platform Developer I build fast, secure and scalable systems with clean architecture, smooth API Development and Web Development that lifts business metrics.

📅 Last updated: 23. 08. 2026

Steps for completing your project

After purchasing the project, send requirements so Oleksii can start the project.

Delivery time starts when Oleksii receives requirements from you.

Oleksii works on your project following the steps below.

Revisions may occur after the delivery date.

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Review the work, release payment, and leave feedback to Oleksii.