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Programming Languages
JavaScript, Python, TypeScriptCoding Expertise
Cross Browser & Device Compatibility, Performance Optimization, W3C Markup Validation ServiceWhat's included $1,100
These options are included with the project scope.
$1,100
- Delivery Time 3 days
- Number of Revisions 0
4 reviews
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BW
Ben W.
May 26, 2026
Help me create a website with a huge user-generated database that can connect to each other
What a pleasant experience it was to work with DEVIT. Delivered and maintained 10/10 work, with commitment to quality and very good communication. We worked for years and it was just very pleasent.
Thank you very much.
Thank you very much.
MP
Mauro P.
Mar 8, 2023
JavaScript Developer - POST MVP
All good with Karin and DevIT! Great communication, reliability, and quality work.
MP
Mauro P.
Aug 23, 2022
JavaScript Developer - PH1
All good with Karin and the team at DevIT. They are responsive and provide quality work. I will work with them again in the future.
TT
Traian T.
May 5, 2021
Shopify App Developers Wanted
Excellent! We hope to collaborate again in the future!
About Karin
Full Stack Developer React Developer Node.js Developer Python Next.js
100%
Job Success
Zaporizhzhya, Ukraine - 2:15 am local time
Whether you need to build a high-performance web application from scratch, scale an existing SaaS platform, or continuously optimize your backend and frontend infrastructure to drive real revenue, I am here as a seasoned Full Stack Developer, React Developer, Node.js Developer, Next.js Developer, and Python Developer to turn your vision into a scalable r
I am working as a dedicated Full Stack Developer, React Developer, Node.js Developer, Next.js Developer, and Python Developer, building robust scalable web architectures that actually move the needle on user engagement and performance, not just look good in a screenshot. My background in software engineering and UI UX I shapes how I approach every system.
A quick snapshot of the work:
I have built 35+ custom web applications from scratch as a Full Stack Developer, React Developer, Node.js Developer, Next.js Developer, and Python Developer executing flawless frontend-to-backend integrations.
Engineered 45+ custom scalable backend apps and microservices on Node.js and Python as a Node.js Developer, Python Developer, and Full Stack Developer, handling 100,000+ active users and API requests without issues.
Completed 100+ technical code and performance audits as a Full Stack Developer, React Developer, Node.js Developer, Next.js Developer, and Python Developer and can do it for you!
I have delivered 30+ complex system migrations, including moving massive relational databases and data rows with zero downtime, led by an expert Full Stack Developer, Node.js Developer, and Python Developer.
🔹 Where I focus as a Full Stack Developer, React Developer, Node.js Developer, Next.js Developer, and Python Developer:
Performance, speed, and clean code. Modern frontend builds with React.js and Next.js combined with powerful backend systems (Node.js, PHP/Laravel, Python) have pushed client platform efficiency up 15–35%, mostly by fixing bottlenecks, optimizing server response times, and refining client-side navigation. As a Full Stack Developer, React Developer, and Next.js Developer, I also eliminate technical bloat: replacing heavy libraries with lightweight native hooks and optimized components.
🔹 Custom development as a Full Stack Developer, React Developer, Node.js Developer, Next.js Developer, and Python Developer:
When a product needs something standard frameworks don't offer out of the box, I build it: as a Node.js Developer, Python Developer, and Full Stack Developer, I build custom APIs, REST & GraphQL integrations, secure webhook setups, authentication systems, and dynamic user interfaces using React.js and Next.js (App Router) with Tailwind CSS and Shadcn UI.
🔹 Migrations and Database Architecture with a Full Stack Developer:
Legacy system upgrades, monolith-to-microservice splits, or database restructuring are handled carefully by an experienced Full Stack Developer, Node.js Developer, Python Developer, and Next.js Developer where data safety, security, and performance optimization are absolute priorities.
🔹 Industries I've worked in as a Full Stack Developer, React Developer, Node.js Developer, Next.js Developer, and Python Developer:
SaaS & digital products, FinTech, healthcare & wellness, logistics & supply chain, enterprise internal tools, and high-traffic e-commerce ecosystems.
🔹 How I work as a Full Stack Developer, React Developer, Node.js Developer, Next.js Developer, and Python Developer:
I start with a technical architecture review before touching any code. From there, as a Full Stack Developer, React Developer, Node.js Developer, Next.js Developer, and Python Developer, I handle system design, component wiring, and development with clean, maintainable code, followed by rigorous testing and deployment. Everything gets tested cross-browser and mobile-first.
🔹 Specialize in modern frontend architectures, React.js, Next.js (App Router), TypeScript, Tailwind CSS, and mobile-first responsive design as a Full Stack Developer and React Developer.
🔹 Build high-throughput server-side applications, REST APIs, and microservices leveraging Node.js, Express, and asynchronous event-driven patterns as a Node.js Developer and Full Stack Developer.
🔹 Engineer lightning-fast server-side rendering (SSR), static site generation (SSG), and optimized routing structures as a Next.js Developer and React Developer.
🔹 Develop smart automations, data scraping scripts, machine learning integrations, and heavy backend data processing using Python as a Python Developer and Full Stack Developer.
🔹 Handle complex relational database design, optimization, and migrations across PostgreSQL, MySQL, MongoDB, and SQLite as a Full Stack Developer, Node.js Developer, and Python Developer.
🔹 Optimize Core Web Vitals, fix page speed bottlenecks, and eliminate third-party script bloat to maximize web performance as a Full Stack Developer, React Developer, and Next.js Developer.
Steps for completing your project
After purchasing the project, send requirements so Karin can start the project.
Delivery time starts when Karin receives requirements from you.
Karin works on your project following the steps below.
Revisions may occur after the delivery date.
Codebase Review & Setup
I will thoroughly analyze your existing Node.js/React repository, clarify the specific task requirements, and set up the local development environment to ensure a smooth start.