You will get Full Stack Technical Consulting | Code Review | Architecture Planning
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Project details
I provide expert Full Stack Technical Consulting, Code Review, and Software Architecture Planning for high-performance web applications.
Key areas covered during our dedicated session:
• Tech Stack Advisory & Scaling: Node.js, Express, React, Next.js, Laravel, PHP, and Python.
• Database Architecture & Planning: MongoDB, MySQL, PostgreSQL, Relational & Non-Relational DBs.
• E-commerce & SaaS Ecosystems: Shopify App Development, GraphQL API Sync, Webhooks, REST APIs.
• Code Review & Performance: Security Audit, API Integrations, Refactoring, System Infrastructure.
Get professional IT Consulting, a clear Development Roadmap, and strategic Product Management guidance to set your project up for long-term technical success.
Key areas covered during our dedicated session:
• Tech Stack Advisory & Scaling: Node.js, Express, React, Next.js, Laravel, PHP, and Python.
• Database Architecture & Planning: MongoDB, MySQL, PostgreSQL, Relational & Non-Relational DBs.
• E-commerce & SaaS Ecosystems: Shopify App Development, GraphQL API Sync, Webhooks, REST APIs.
• Code Review & Performance: Security Audit, API Integrations, Refactoring, System Infrastructure.
Get professional IT Consulting, a clear Development Roadmap, and strategic Product Management guidance to set your project up for long-term technical success.
Programming Languages
HTML & CSS, JavaScript, TypeScriptCoding Expertise
Cross Browser & Device Compatibility, Performance Optimization, W3C Markup Validation ServiceWhat's included $150
These options are included with the project scope.
$150
- Delivery Time 1 day
- Number of Revisions 0
- Design Customization
- Content Upload
- Responsive Design
- Source Code
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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, Next.js, Node.js, Python, AI and SaaS
100%
Job Success
Zaporizhzhya, Ukraine - 6:22 am local time
Looking to build a scalable SaaS platform, launch a custom e-commerce solution, or manage complex data architectures?
- Please DM me or send an invite to proceed! 📩
Hi! I am a Full Stack Developer specializing in building high-end, smooth, and lightning-fast web applications. I bridge the gap between powerful backend systems (Node.js, PHP/Laravel, Python) and modern, sleek user interfaces (React, Next.js).
Whether you need to build a massive, user-driven relational database (like a collaborative digital museum), develop a public Shopify app from scratch, or integrate smart automation into your product, I focus on clean code and optimal performance.
⚡ My Core Tech Stack:
Frontend: React.js, Next.js (App Router), JavaScript/TypeScript, Tailwind CSS, Shadcn UI / Material UI
Backend & APIs: PHP (Laravel Expert), Node.js, Express, Python, RESTful APIs, GraphQL
Databases & Architecture: MySQL, PostgreSQL, MongoDB, SQLite, Database Design & Optimization
CMS & E-commerce: Shopify Apps (Public/Private), Shopify Themes, WordPress (Custom Plugins/Themes), API & System Integrations
🛠️ What I Can Help You With:
SaaS & Web Applications: End-to-end development from scratch with a slim, high-end look and feel.
Complex Database Design: Crafting optimized, interconnected data structures capable of handling massive amounts of user-generated content.
E-commerce & Shopify Ecosystem: Developing robust Shopify apps, custom storefronts, and seamless platform migrations (e.g., migrating WordPress to Shopify).
Third-Party APIs & Automation: Connecting payment gateways, CRM tools (like Credit Repair Cloud), printing/faxing extensions, or OpenAI/LLM API workflows.
I am known for:
• Transparent and clear communication
• Short response times & high responsiveness
• A proactive ability to solve technical obstacles before they impact your timeline
Whether you are building a specialized marketplace, an automated B2B tool, or a custom Shopify extension, I ensure your project is technically elite and built for scale.
Updated 03.07.2026
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.
Pre-Call Material Review
Before our live call, I will thoroughly review your submitted documentation, project brief, or current codebase to maximize our time together.