You will get Backend Development | Node.js Developer | API & System Architecture
Top Rated
Top Rated
Project details
I offer reliable backend development using Node.js, focusing on building scalable and stable systems. As a backend developer and Node.js developer, I design and implement APIs, business logic, and system architecture.
I work on real product features like authentication, data processing, integrations, and performance optimization. My goal is to build backend systems that are easy to scale and maintain.
As part of Node.js development, I handle:
• REST API and GraphQL APIs
• authentication (JWT, OAuth)
• database design (PostgreSQL, MongoDB)
• integrations with third-party services
• real-time systems (WebSockets)
• background jobs and data processing
I also understand frontend workflows and can support integration with React applications as part of full stack development.
If you need a strong backend developer for Node.js development, I can help you build a solid foundation for your product.
I work on real product features like authentication, data processing, integrations, and performance optimization. My goal is to build backend systems that are easy to scale and maintain.
As part of Node.js development, I handle:
• REST API and GraphQL APIs
• authentication (JWT, OAuth)
• database design (PostgreSQL, MongoDB)
• integrations with third-party services
• real-time systems (WebSockets)
• background jobs and data processing
I also understand frontend workflows and can support integration with React applications as part of full stack development.
If you need a strong backend developer for Node.js development, I can help you build a solid foundation for your product.
Programming Languages
JavaScript, TypeScriptCoding Expertise
Cross Browser & Device CompatibilityWhat's included
| Service Tiers |
Starter
$40
|
Standard
$500
|
Advanced
$1,000
|
|---|---|---|---|
| Delivery Time | 1 day | 3 days | 5 days |
Number of Revisions | 0 | 0 | 0 |
Design Customization | - | - | - |
Content Upload | - | - | |
Responsive Design | - | - | |
Source Code | - | - |
About Oleksandr
Full Stack Website Developer | PHP | React | Next.js | Node.js
100%
Job Success
Kyiv, Ukraine - 7:13 pm local time
As a Full Stack Web Developer, build the whole product: database and API on the backend, the interface clients actually use on the frontend, and AI features inside both.
Backend Development — MVP to 600,000+ users on a rewards platform I built
- Node.js, NestJS, Express, TypeScript
- REST & GraphQL APIs, auth, role-based permissions (RBAC), row-level security
- PostgreSQL, MongoDB, Redis — schema design, indexing, query optimization
- Background jobs, queues, cron pipelines, webhook processing
- Real-time features with WebSockets
- AWS, Docker, CI/CD, monitoring
Full Stack Web Developer: Front-End Development — real-estate marketplace shipped in 6 months, client raised €2.2M
- Full Stack Web Development
- React, Next.js, TypeScript
- SSR/SSG, Core Web Vitals, SEO-critical page performance
- Data-heavy dashboards & admin panels (multi-tenant SaaS with 10,000+ active users)
- Design systems, reusable component libraries
- State management at scale: Redux, Zustand, React Query
- Search, filters, maps, complex forms
API Development & Integrations — Stripe billing, maps, messaging, CRMs
- Payment flows: subscriptions, usage-based billing, refunds, webhooks
- Third-party API integrations and anti-corruption layers
- Multi-tenant architecture with per-tenant data isolation
AI Development — healthcare AI MVP that raised $2M
- RAG chatbots and AI assistants: 70% of support tickets handled automatically, reply time cut from 4 hours to under 1 minute
- AI chatbot handling 300+ chats/day in production
- OpenAI / Anthropic integrations, LangChain & LangGraph agents
- Semantic search with vector databases (pgvector, Pinecone, Qdrant)
- 50+ automation workflows on n8n / Make
Mobile & Cross-Platform - Full Stack Web Developer— 6M+ users on a React Native product
- React Native apps shipped to App Store and Google Play
- Shared TypeScript logic between web and mobile
Stack
React · Next.js · TypeScript · Node.js · NestJS · PostgreSQL · MongoDB · Redis · GraphQL · Docker · AWS · Stripe · LangChain · OpenAI API
Track record
89 completed projects · $200K+ earned · 93% Job Success · Top Rated Plus
Why clients keep me on long-term as a Full Stack Web Developer:
- I think in product logic, not tickets
- I flag architectural mistakes before they get expensive
- I write code the next developer can read
- I stay with products as they scale
Building a SaaS platform, marketplace, AI product or internal tool? Tell me what you're building and I as a Full Stack Web Developer reply with a concrete technical direction.
Steps for completing your project
After purchasing the project, send requirements so Oleksandr can start the project.
Delivery time starts when Oleksandr receives requirements from you.
Oleksandr works on your project following the steps below.
Revisions may occur after the delivery date.
short discovery phase to clarify goals, target users, and priorities
Tech stack selection
Experience with various databases and tools allows selecting what best fits the product’s needs