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You will get Code and Architecture review of your Node.js application
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Project details
๐ข๐๐ฟ ๐ฆ๐ฒ๐ฟ๐๐ถ๐ฐ๐ฒ๐
โ In-Depth Code Analysis
โ Focus on Maintainability and Readability
โ Best Practices and Security
โActionable Recommendations
๐ช๐ต๐ฎ๐ ๐ช๐ฒ ๐ก๐ฒ๐ฒ๐ฑ ๐๐ฟ๐ผ๐บ ๐ฌ๐ผ๐
โ Project Code
โ Project Context
โ Coding Standards (Optional)
๐๐ฏ๐ผ๐๐ ๐จ๐
Our Node.js team is a group of highly skilled and experienced developers who specialize in building high-performance, scalable applications using Node.js. We use the latest tools and technologies to create cutting-edge web and mobile applications, and our team is dedicated to delivering the highest quality work on time and within budget. Whether you need a simple web app or a complex enterprise-level solution, our Node.js team has the expertise to get the job done.
Building Better Together: 10 Years of the Node.js Community!
โ In-Depth Code Analysis
โ Focus on Maintainability and Readability
โ Best Practices and Security
โActionable Recommendations
๐ช๐ต๐ฎ๐ ๐ช๐ฒ ๐ก๐ฒ๐ฒ๐ฑ ๐๐ฟ๐ผ๐บ ๐ฌ๐ผ๐
โ Project Code
โ Project Context
โ Coding Standards (Optional)
๐๐ฏ๐ผ๐๐ ๐จ๐
Our Node.js team is a group of highly skilled and experienced developers who specialize in building high-performance, scalable applications using Node.js. We use the latest tools and technologies to create cutting-edge web and mobile applications, and our team is dedicated to delivering the highest quality work on time and within budget. Whether you need a simple web app or a complex enterprise-level solution, our Node.js team has the expertise to get the job done.
Building Better Together: 10 Years of the Node.js Community!
Programming Languages
JavaScript, TypeScriptWhat's included $199
These options are included with the project scope.
$199
- Delivery Time 2 days
- Number of Revisions 1
Optional add-ons
You can add these on the next page.
Additional Revision
+$150
5 reviews
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MM
Matthew M.
Jan 15, 2026
HubSpot Development Team Partner
Fantastic experience. They quickly understood a complex domain, communicated clearly throughout, and delivered well-structured technical insights that will help shape our next development steps. Would gladly work with them again and highly recommend them for any fintech work.
DS
Daria S.
Nov 12, 2025
Customer Data Platform for Skincare company
Working with this freelancer has been an exceptional experience. They demonstrated deep technical expertise, strong communication, and an ability to translate complex product requirements into elegant, scalable solutions. Their work on our headless Shopify integration exceeded expectations โ reliable, well-architected, and thoughtfully delivered. They approach every challenge with precision and ownership, making them one of the best collaborators Iโve worked with.
DS
Daria S.
Aug 12, 2025
Senior Node.js Developer for beauty industry marketplace
Working with Valery to build our beauty marketplace from scratch using Strapi was fantastic. They really know their stuff when it comes to Node.js and delivered exactly what we needed.
The marketplace turned out great - everything works smoothly from user accounts to payments to vendor management. They built a solid, scalable solution that's been running perfectly since launch.
What I loved most was how well they fit in with our team. Great communication, always responsive, and just genuinely nice to work with. Made the whole project feel easy and collaborative.
If you need a senior Node.js dev who can handle complex projects and is awesome to work with, definitely hire them. Would work with them again in a heartbeat!
The marketplace turned out great - everything works smoothly from user accounts to payments to vendor management. They built a solid, scalable solution that's been running perfectly since launch.
What I loved most was how well they fit in with our team. Great communication, always responsive, and just genuinely nice to work with. Made the whole project feel easy and collaborative.
If you need a senior Node.js dev who can handle complex projects and is awesome to work with, definitely hire them. Would work with them again in a heartbeat!
DS
Daria S.
Apr 11, 2025
Backend Developer (Telehealth Platform)
As always, working with Valerii and the Onix Team was amazing. We are considering them as development partners: their knowledge, experience, advice, and velocity are fascinating! They know how to ship well-developed products of any complexity.
DS
Daria S.
Feb 14, 2025
Beauty industry marketplace and backend
A very skillful team. We were blessed to build a beauty marketplace with the strap backend fast and efficientlyโgreat experience with backend and forntend. The team advises on proper improvementsโfantastic work ethic, always available and responsive. Highly recommend.
About Valerii
Node js Developer | Full Stack Node.js React | AI-Powered Node.js Dev
100%
Job Success
Kropyvnytskyy, Ukraineย - 3:40 am local time
๐ค Modern ๐๐ ๐๐ญ๐๐๐ค: Cursor, Lovable, Claude Code, GitHub Copilot, GPT-4/GPT-4o, Claude Sonnet/Opus
โก 10+ Years of Professional Experience
โก ๐๐ ๐๐ ๐๐ง๐ญ๐ฌ, ๐๐๐ ๐๐ง๐ญ๐๐ ๐ซ๐๐ญ๐ข๐จ๐ง๐ฌ & ๐๐ฎ๐ญ๐จ๐ฆ๐๐ญ๐ข๐จ๐ง ๐๐จ๐ซ๐ค๐๐ฅ๐จ๐ฐ๐ฌ ๐๐๐ฅ๐ข๐ฏ๐๐ซ๐๐
โก 30โ40% Faster Delivery Through ๐๐-๐๐ฌ๐ฌ๐ข๐ฌ๐ญ๐๐ ๐๐ง๐ ๐ข๐ง๐๐๐ซ๐ข๐ง๐
Welcome! ๐ I'm a Senior Node.js Developer, Node.js Backend Developer, and Full-Stack Developer specializing in scalable, secure, and high-performance backend systems.
For 10+ years, I've helped companies architect, build, optimize, and modernize SaaS platforms, enterprise applications, fintech products, healthcare solutions, CRM/ERP systems, and marketplace platforms. From Startup MVPs to enterprise ecosystems, I deliver software designed to scale with business growth.
๐ฅ WHAT YOU GET
โ High-Performance Backend systems engineered to process millions of requests with 99.99% uptime.
โ Production-ready features delivered 30โ40% faster using AI-assisted development and AI-generated code workflows.
โ End-to-End Developmentโfrom MVP Development and Product Development to long-term Backend Support and Application Maintenance.
โ A Dedicated Developer and Technical Lead focused on measurable business outcomes.
๐ค AI-ASSISTED ENGINEERING STACK
โ 5+ years leveraging Cursor, GitHub Copilot, Claude Code, OpenAI ChatGPT, GPT-4, and GPT-4o to accelerate prototyping, debugging, testing, and implementation by 30โ40%.
โ While AI accelerates delivery, critical architecture decisions, scalability planning, and Technical Lead responsibilities remain grounded in 10+ years of engineering experience.
๐ WHERE I DELIVER
As a Senior Node.js Developer and Backend Engineer, I build REST API and GraphQL API ecosystems using Node.js, Express.js, NestJS, Fastify, Koa.js, JavaScript, TypeScript, WebSocket, Socket, Microservices, and Event-Driven Architecture.
As an API Developer and REST API Developer, I deliver API Development, API Integration, Third-Party API Integration, Authentication, Authorization, JWT, OAuth, SSO, Swagger, OpenAPI, and API Documentation for secure enterprise environments.
As a Full Stack Developer, I create Web Applications, Ecommerce Websites, Website Redesign projects, Browser Extensions, Google Chrome Extensions, Desktop Applications, Platform Plugins, Headless CMS, CMS Integration, Odoo Development solutions, and End-to-End Development initiatives.
As an AI engineering partner, I help companies implement AI Development through AI Agent Development, AI App Development, AI Bots, Chatbots, ChatGPT Integration, OpenAI API integrations, OpenAI Codex Prompt workflows, AI Model Integration, and AI-generated code strategies that improve team productivity by 30โ40%.
๐ณ INTEGRATIONS & AUTOMATION
โ 10+ years integrating Stripe Integration, PayPal Integration, Twilio Integration, SendGrid, shipping providers, Payment Integration services, Webhooks, and System Integration workflows.
โ Built asynchronous architectures using RabbitMQ, Kafka, BullMQ, Queue Management, and Message Queues to improve throughput and reliability.
โ Automated Data Processing and ETL pipelines that reduce manual effort and support real-time decision-making.
โ๏ธ TECHNOLOGY ECOSYSTEM
โ 10+ years of Backend Development using Node.js, Express.js, NestJS, Fastify, JavaScript, TypeScript, Python, PHP, Java, Kotlin, Scala, Ruby, C#, ASP.NET, Django, and modern Software Architecture practices.
โ 8+ years delivering Full-Stack Development with React, Angular, AngularJS, Vue.js, HTML5, CSS3, Bootstrap, jQuery, Google Analytics, Adobe Photoshop, and Website Optimization strategies.
โ 10+ years designing Database Development and Database Architecture solutions using MongoDB, PostgreSQL, MySQL, Redis, DynamoDB, Firebase, Supabase, Prisma, TypeORM, Sequelize, Mongoose, Microsoft SQL Server, MariaDB, Oracle, Neo4j, and Azure Cosmos DB.
โ 7+ years deploying cloud-native applications with Amazon Web Services (AWS), Lambda, EC2, S3, Azure, Google Cloud Platform, Docker, Kubernetes, DevOps, Serverless Architecture, GitHub Actions, Jenkins, Git, and CI/CD pipelines.
๐ RESULTS & IMPACT
โ Delivered SaaS Development initiatives, ecommerce solutions, enterprise applications, and real-time systems serving thousands of users worldwide.
โ Improved API performance by up to 50% through Backend Optimization, Redis caching, and Database Architecture improvements.
โ Accelerated release cycles by 30โ40% using AI-native engineering practices without sacrificing maintainability.
โ Built Scalable Backend infrastructures capable of supporting millions of transactions and sustained business growth.
Whether you need a Node.js Developer, Node.js Backend Developer, Backend Engineer, Full-Stack Developer, API specialist, AI integration partner or Technical Lead I'd be happy to discuss your architecture, roadmap, and next steps.
Steps for completing your project
After purchasing the project, send requirements so Valerii can start the project.
Delivery time starts when Valerii receives requirements from you.
Valerii works on your project following the steps below.
Revisions may occur after the delivery date.
Project Kick-off & Information Gathering
The specific code you want reviewed. The purpose of the review (bug fix, new feature, refactoring). Any areas of particular concern. Coding standards or guidelines to follow. Your desired outcomes for the review.
Code Retrieval & Familiarization
Once I have access to the code, I'll download and set up a local development environment (if needed). I'll then take time to thoroughly review the codebase, including relevant documentation and any provided test materials.