⚡️ Do you have a new product to build, and are you looking for an expert backend developer you can trust to design and build the server side of your product?
Look no further!
I have more than 10 years of experience in web development with various programming languages (mostly PHP and Golang) in very different companies (from big tech to small non-profit projects).
Now I specialize in building startups:
✅ I design, implement and deploy features as fast as possible
✅ I always add valuable metrics
✅ I write clean code that can easily grow and evolve for your product's needs.
✅ I can suggest existing services, open-source tools/libraries, or no-code/low-code solutions reducing development.
I'm a full-time Upwork freelancer, and this is not just a side hustle for me.
I can offer you a professional project delivery with high-quality code and clean architecture. I will take the time to understand your needs and ensure that the product works according to your vision.
⏩ If you're looking for a professional and experienced backend developer who will deliver the results you want, contact me right now to make progress together!
Golang
PostgreSQL
MySQL
MongoDB
Apache Kafka
Docker
Kubernetes
Microservice
CI/CD
Software Architecture & Design
Web Services Development
API Development
Startup Company
Hennadii S.
Goettingen, Germany
$40/hr
4.5
23 jobs
Are you building a standard web application, or an intelligent business platform?
In today's market, "clean code" is the bare minimum. You need a system that is secure, scalable, and capable of leveraging modern AI to automate your business logic.
I am not just a coder; I am a Solutions Architect with over 11 years of experience. I bridge the gap between robust, enterprise-grade engineering (PHP/Laravel/Symfony) and the new world of AI integration. While junior developers rely on AI to write their code, I use my deep architectural expertise to build secure AI agents and workflows directly into your application.
I specialize in helping founders and SMEs transition from "legacy" web apps to intelligent, automated platforms without rewriting everything from scratch.
How I Help You Win:
- AI-Powered SaaS Architecture: I build platforms where AI isn't a gimmick. It’s a core feature. From intelligent admin dashboards (FilamentPHP) to custom RAG (Retrieval-Augmented Generation) systems that "talk" to your database.
- Enterprise Reliability: I bring a senior engineer’s discipline to development. I write strict types, optimize complex SQL queries for speed, and ensure your data remains secure—things that "no-code" tools cannot do.
- MVP Acceleration: Using modern stacks (TALL stack, Filament, Livewire), I can deliver production-ready MVPs in weeks, not months, allowing you to secure funding or revenue faster.
Technical Stack & Expertise:
- 🚀 AI & Automation Integration
- LLM Integration: OpenAI, Anthropic (Claude), and open-source models.
- Intelligent Workflows: Building custom agents that automate data entry, categorization, and content generation.
- RAG Implementation: Connecting your private business data to AI safely.
backend Backend & Architecture (The Core)
- Languages: PHP 8.x, SQL (MySQL/MariaDB).
- Frameworks: Laravel (Expert), Symfony, Slim.
- Admin Panels: FilamentPHP. Rapidly building internal tools and customer portals.
- Database: Complex SQL optimization, Schema Design, Migration strategies.
frontend Frontend & UX
-Modern Stack: Livewire, Alpine.js, Tailwind CSS (The "TALL" Stack).
- JS Frameworks: Vue.js, React (for specific reactive components).
🛠 DevOps & Quality Assurance
- Infrastructure: Docker, CI/CD Pipelines (GitHub Actions), Heroku.
- Testing: PHPUnit, Pest, Static Analysis (PHPStan). I ensure the code works before you ever see it.
Why Work With Me? I have been a Founder & CEO, a CTO, and a Lead Developer. I understand that you aren't paying for code; you are paying for a business result. I communicate clearly, I work autonomously, and I treat your budget with the same respect I treat my own.
Ready to upgrade your technology? Click the green "Invite to Job" button. Let’s discuss how we can build a system that works as hard as you do.
PHP
Web Application
AI App Development
AI Development
JavaScript
MySQL
Symfony
Laravel
React
Vue.js
Angular
CSS
HTML
API
Web Development
Svyatoslav M.
Berlin, Germany
$41/hr
5.0
47 jobs
Hi! I'm a Senior Generative AI & Full-Stack Engineer with 15+ years of experience specializing in building production-ready AI applications, Custom Chatbots, and Multi-Agent systems.
Are you looking to bridge the gap between advanced Artificial Intelligence and a robust, production-ready web architecture? I deliver scalable, secure, and smart technical solutions that turn complex business ideas into high-performing digital products.
I combine deep expertise in foundational backend/frontend stacks with cutting-edge Generative AI engineering. Whether you need an autonomous AI Agent framework, a high-accuracy RAG pipeline, or a complex enterprise web application, I handle everything from core architecture to seamless UI deployment.
Please look at my portfolio below to see my "ML-Based Price Recommendation System", "AI-Powered HR Application Full Stack Development", "Full-Stack Developer For Custom ERP", and many others.
Core AI & Machine Learning Expertise:
- Large Language Models (LLMs): Custom integration, API optimization, and fine-tuning with OpenAI, LLaMA, Claude, etc.
- Advanced RAG Systems: Building intelligent Retrieval-Augmented Generation architectures to connect LLMs with private corporate data sources, minimizing hallucinations.
- AI Agents & Conversational Systems: Development of autonomous multi-agent workflows, AI chatbots, smart routing systems, and NLP tools (LangChain, LlamaIndex).
Robust Full-Stack Stack:
- Backend: Node.js, Express.js, PHP (Laravel, Yii), Python, API Integration, and high-load architecture.
- Frontend: React.js, Next.js, and modern JavaScript for intuitive, interactive AI user interfaces.
- Databases & Cloud: Vector databases (Pinecone, Chroma), PostgreSQL, MySQL, and secure cloud deployment via Amazon Web Services (AWS Partner & Certified Cloud Practitioner) and GCP.
Why Work With Me:
- 100% Job Success & Top Rated Plus: A proven track record of delivering clean code, meeting strict deadlines, and maintaining clear communication.
- Business-Centric Approach: I don't just write code; I design systems that optimize internal workflows, improve user retention, and cut operational costs.
- Agile Integration: backed by the engineering strength of the Greenice team, allowing for rapid scaling if your project requires additional resources.
Let’s turn your vision into a production-ready application. Click the "Invite to Job" button, and let’s discuss the technical architecture of your project!
API Integration
Machine Learning
Artificial Intelligence
Python
AI Agent Development
AI Chatbot
Retrieval Augmented Generation
AI Platform
LangChain
Artificial Neural Network
Natural Language Processing
Deep Learning
TensorFlow
Amazon Web Services
Google Cloud Platform
OpenAI Inc.
API Development
Node.js
Full-Stack Development
Web Development
Vlad R.
Teutschenthal, Germany
$65/hr
5.0
16 jobs
I optimized IT operations for a fintech unicorn, facilitating the company’s growth from 300+ to over 800 employees without adding to the two-person support team.
I Automated Employee Onboarding and Offboarding for a German software company, reducing a multi-day manual process down to 5 minutes, saving approximately 30+ hours per month for teams in IT and HR.
I've saved over $120.000/year in license costs at a company in the IoT space.
I am an automation expert dedicated to streamlining and enhancing business processes. I specialize in automating manual tasks, integrating and organizing data sources, and building dynamic dashboards that empower businesses to make data-driven decisions with ease.
My expertise includes:
Airtable, Notion, Monday, ClickUp, Confluence
Google Workspace (Sheets, Forms, Docs) & Google Admin
Automation Platforms (Make.com, Zapier, n8n)
Supabase/Firebase functions
I bring a blend of business acumen and technical expertise, delivering solutions that are highly functional, user-friendly, and tailored to client needs. My primary focus is on helping clients save time, reduce costs, and create automations that enable them to generate revenue faster. Whether it's automating workflows, creating custom integrations, or designing tools for data visibility, I strive to provide measurable results that make a tangible impact.
Make.com
Zapier
n8n
Automation
IT Consultation
IT Asset Management
IT Management
ITIL
Ticketing System
Project Management Software
Malamin J.
Berlin, Germany
$25/hr
4.1
13 jobs
Hi, I’m Malamin a Senior Full‑Stack Developer with 6+ years of experience building scalable, high‑performance, and business‑ready web applications.
Give me something to build and I’ll deliver a solution that works for you 24/7 fast, reliable, and built with clean, maintainable code.
If you send an invitation or message, I’ll reply with a personalized plan on how I can help your project immediately.
I design, develop, and optimize modern applications for startups, agencies, and enterprise teams. My work spans e‑commerce, fintech, SaaS, education, and healthcare, delivering:
* High-quality Frontend Development
* Robust Backend Development
* End-to-end Full-Stack Engineering
* Scalable SaaS Platforms
* Secure AP! Integrations
* Real-time Chat Applications
* Modern Ul/UX Interfaces
* High-speed Performance Optimization
Frontend
* HTML5, CSS3, Bootstrap, Tailwind CSS
* React Developer, Vue.js Developer, Angular Developer
* JavaScript / TypeScript
* Vite, Responsive Ul, Component Architecture
Backend
* Node.js Developer
* Express.js, Next.js
* Python Developer (Django, Flask)
* PHP Developer
* Java Spring Boot Developer
* Ct+, C#,.NET Core
Databases
* MongoDB Developer.
* MySQL Developer.
* PostgreSQL Developer
Other Technologies
* Authentication (JWT, Auth)
* WebSockets Developer
* RESTful APIs
* Al Integration & Chatbots
* CI/CD (GitHub Actions, Vercel, Netlify)
* WordPress
* Localization
* Git & GitHub
* Performance Optimization & System Scaling
What I Can Build for You
* Frontend Web Applications
* Full-Stack Platforms
* SaaS Products
* E-commerce Systems
* Real-Time Chat Apps
* Al-Powered Applications
* API-Driven Backends
* Modern UI/UX Dashboards
* High-Performance, Scalable Architectures
Why Clients Hire Me
I’ve delivered successful projects across multiple industries, working with international teams and diverse cultures. My focus is always on:
* Clean, maintainable code
* Fast delivery
* Clear communication
* Long-term reliability
* Scalable architecture
* User-focused design
If you're looking for a developer who can build fast, think strategically, and deliver consistently, I'm ready to join your project.
Full-Stack Development
WordPress
Bootstrap
JavaScript
CSS Framework
React
API
AI Development
Node.js
AI Builder
Front-End Development
API Framework
LLM Prompt Engineering
Python
Adnan S.
Frankfurt am Main, Germany
$65/hr
4.9
46 jobs
Custom PHP and Laravel developer specialized in WooCommerce and Shopify. I build features that plugins cannot, fix what is broken, speed up slow stores, and automate the manual work behind them. 🏆 𝗧𝗢𝗣 𝗥𝗔𝗧𝗘𝗗 on Upwork, 100% Job Success.
Most stores do not need a rebuild. They need someone reliable who finds the real problem, fixes it with the simplest good method, and documents what changed. I do not over-engineer small tasks, I use staging and backups, I flag risks before I touch anything, and I explain every change in plain English. That is why agencies and store owners keep me on long term.
𝗪𝗼𝗼𝗖𝗼𝗺𝗺𝗲𝗿𝗰𝗲 & 𝗪𝗼𝗿𝗱𝗣𝗿𝗲𝘀𝘀
✔️ WooCommerce development and customization
✔️ Checkout and cart UX fixes
✔️ Plugin and theme conflicts, bug fixes
✔️ Elementor and landing pages from Figma
✔️ Custom plugins, Gravity Forms, WPML
✔️ Payment gateways (Stripe, PayPal)
✔️ Speed optimization and Core Web Vitals
✔️ Technical SEO basics and ongoing maintenance
𝗦𝗵𝗼𝗽𝗶𝗳𝘆
✔️ Theme customization and custom sections
✔️ Liquid edits and admin setup
✔️ Product, cart, and checkout optimization
✔️ App integrations and speed improvements
𝗖𝘂𝘀𝘁𝗼𝗺 𝗗𝗲𝘃𝗲𝗹𝗼𝗽𝗺𝗲𝗻𝘁 (𝗣𝗛𝗣 / 𝗟𝗮𝗿𝗮𝘃𝗲𝗹)
Where most ecommerce devs stop, I keep going. When a plugin cannot do the job, I write it.
✔️ Custom WordPress and WooCommerce plugins
✔️ Laravel web apps and dashboards
✔️ Custom REST APIs and third-party integrations
✔️ Node.js and Symfony backend work
✔️ Database design and performance tuning
𝗔𝘂𝘁𝗼𝗺𝗮𝘁𝗶𝗼𝗻 (𝗺𝘆 𝗲𝗱𝗴𝗲)
If a task should run by itself, I build it with n8n, Make, or Zapier. A few I have shipped:
✔️ AI customer support agent (n8n + ChatGPT) handling Facebook and Instagram DMs and comments automatically.
✔️ AI email responder that reads, classifies, and replies with no human in the loop.
✔️ Order pipeline that pulls wholesale orders from Faire, matches SKUs, and creates sales orders in Katana.
✔️ Lead SMS automation that parses lead emails and sends a personalized SMS within minutes, built for a Swedish solar company.
If the API is undocumented, I reverse-engineer it.
𝗖𝗼𝗿𝗲 𝗧𝗼𝗼𝗹𝘀 & 𝗦𝗸𝗶𝗹𝗹𝘀
✔️ Ecommerce and WordPress: WooCommerce · Shopify · Liquid · Elementor · Gravity Forms · WPML · Stripe · PayPal · Core Web Vitals · Speed Optimization · Technical SEO
✔️ Backend and Custom Dev: PHP · Laravel · Node.js · Symfony · Custom APIs · MySQL
✔️ Automation: n8n · Make · Zapier · ChatGPT API · Claude API · REST APIs · Webhooks · GoHighLevel · HubSpot
✔️ Frontend and DevOps: JavaScript · React.js · jQuery · HTML5 · CSS3 · Docker · Git · NGINX · Cloudflare
𝗪𝗵𝘆 𝗖𝗹𝗶𝗲𝗻𝘁𝘀 𝗦𝘁𝗮𝘆 𝗪𝗶𝘁𝗵 𝗠𝗲
✅ Top Rated, 100% Job Success, 10+ years, 40+ projects across many industries
✅ Clean, maintainable code you can hand to anyone
✅ Clear communication and fast response, with before and after notes on every change
Have a store to fix or speed up, a custom feature to build, or a process to automate? Send me a message and let's talk.
Core Expertise: PHP Developer, Laravel Developer, WooCommerce Developer, Shopify Developer, WordPress Developer, Custom Plugin Development, Shopify Theme Customization, Liquid, Elementor, WooCommerce Speed Optimization, Core Web Vitals, Page Speed Optimization, Checkout Optimization, Landing Page Development, Figma to WordPress, REST API Integration, Node.js, GA4, Google Tag Manager, Meta Pixel, Technical SEO, Website Maintenance, n8n, Make, Zapier.
PHP
API Integration
n8n
Make.com
Automated Workflow
Zapier
AI Agent Development
Automation
WordPress
Prompt Engineering
OpenAI API
Claude
ChatGPT
Airtable
Laravel
JavaScript
WooCommerce
Business Process Automation
Shopify
Liquid
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