You will get a skilled Full Stack Developer to create secure Node.js applications
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🚫 Do not buy this!
I’m a Back End Developer, Front End Developer and Full Stack Deveoloper with extensive experience building robust, scalable, and secure web applications. What sets me apart is my ability to create efficient server-side solutions that power fast, reliable, and high-performing websites and applications.
I specialize in API development, database management, and server architecture, ensuring seamless data flow, strong security, and smooth integration with frontend systems. My focus is on delivering solutions that are maintainable, scalable, and optimized for performance, so your project runs flawlessly today and grows effortlessly with your business needs.
Whether it’s designing complex APIs, integrating third-party services, or optimizing server performance, I provide back-end solutions that form the backbone of successful digital products.
🚀 Let’s build a secure, high-performance system that supports your business and drives measurable results.
I’m a Back End Developer, Front End Developer and Full Stack Deveoloper with extensive experience building robust, scalable, and secure web applications. What sets me apart is my ability to create efficient server-side solutions that power fast, reliable, and high-performing websites and applications.
I specialize in API development, database management, and server architecture, ensuring seamless data flow, strong security, and smooth integration with frontend systems. My focus is on delivering solutions that are maintainable, scalable, and optimized for performance, so your project runs flawlessly today and grows effortlessly with your business needs.
Whether it’s designing complex APIs, integrating third-party services, or optimizing server performance, I provide back-end solutions that form the backbone of successful digital products.
🚀 Let’s build a secure, high-performance system that supports your business and drives measurable results.
Programming Languages
HTML & CSS, JavaScript, TypeScriptCoding Expertise
Cross Browser & Device Compatibility, Performance Optimization, SecurityWhat's included
| Service Tiers |
Starter
$4,500
|
Standard
$9,000
|
Advanced
$13,500
|
|---|---|---|---|
| Delivery Time | 5 days | 10 days | 15 days |
Number of Revisions | Unlimited | Unlimited | Unlimited |
Design Customization | - | - | - |
Content Upload | - | - | - |
Responsive Design | - | - | - |
Source Code | - | - | - |
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IK
Illia K.
Dec 16, 2025
Full Stack Developer Needed for Healthcare Web Platform (React/Next.js + Node.js)
Working with Serhii was an excellent experience. He delivered clean, well-structured code, communicated clearly at every stage, and consistently met deadlines. His ability to understand both the technical requirements and the business goals made a real difference to the final product. Proactive, reliable, and highly skilled across the full stack - I would absolutely recommend him and look forward to working together again.
BE
Ben E.
Dec 9, 2025
Mobile App Development with Discovery Phase (React Native, iOS, Android)
About Serhii
Full-Stack Product Engineer | SaaS Rescue | React & Node | AI
100%
Job Success
Chernihiv, Ukraine - 11:46 pm local time
✅ 100% Job Success on Upwork;
✅ 300+ software projects delivered since 2014;
✅ Experience across SaaS, CRM, e-commerce, subscriptions, fitness, customer-facing platforms and AI automation;
✅ End-to-end delivery across discovery, UX/UI, web, mobile, integrations, QA, and DevOps - backed by the Redlab team when needed.
I help founders turn stalled SaaS products, inherited codebases, and AI-built prototypes into reliable software ready for real users. I assess the technical foundation, fix what is holding the product back, and take it all the way to production.
You probably don’t need more code. You need the right technical decisions: what to keep, what to fix now, and what can wait.
WHAT I TAKE OWNERSHIP OF
I build products from the ground up, take prototypes to production, and stabilize or modernize existing platforms. I handle codebase and production-readiness audits, architecture and reliability improvements, full-stack development with React and Node.js, AI integrations and automation, launch, monitoring, and ongoing iteration.
I do not recommend AI by default. If the problem is better solved through UX improvements, system integration, or simpler automation, I’ll say so.
WAYS TO WORK TOGETHER
1. Production Readiness Audit Identify technical risks, launch blockers, and immediate priorities.
2. Codebase Rescue Sprint Stabilize the product and resolve the most critical technical issues.
3. Product Engineering Partnership Ongoing product development through launch and post-launch iteration.
WHERE I ADD VALUE
💻 FULL-STACK PRODUCT & PLATFORM DEVELOPMENT
• SaaS products, MVPs, and customer portals
• Subscription, membership, booking, and payment systems
• Web and React Native applications, CRM, admin tools, and dashboards
• API architecture, integrations, modernization, scaling, and ongoing development
🤖 AI AGENTS & AUTOMATION
I identify workflows where automation or embedded AI can reduce manual work, improve operations, or create a better customer experience.
• AI agents for support, sales, onboarding, and operations
• CRM and internal workflow automation
• RAG assistants, knowledge search, and document processing
• Embedded AI features, personalization, and recommendations
• Human approval, access controls, monitoring, and cost management
I do not recommend AI by default. If better UX, system integration, or simpler automation is the stronger solution, I will say so.
CORE TECHNOLOGIES
React, Next.js, Vue, Nuxt, Node.js, Laravel, PHP, React Native, PostgreSQL, MySQL, MongoDB, Redis, REST APIs, WebSockets, OpenAI, Claude, RAG, and vector databases.
YOUR NEXT STEP
You do not need to determine in advance whether the right solution is custom development, systems integration, automation, or AI.
📩 Send me a brief overview of your business, current product or workflow, and the outcome you want to achieve. We will start with the business challenge, identify the highest-value opportunity, and define the right technical path forward.
Last updated: 21.08.2026
Steps for completing your project
After purchasing the project, send requirements so Serhii can start the project.
Delivery time starts when Serhii receives requirements from you.
Serhii works on your project following the steps below.
Revisions may occur after the delivery date.
Discovery & Requirements
Define project goals, audience, and core functionality.
Planning & Proposal
Provide a detailed scope, timeline, and milestones for approval.