Senior Full-Stack Developer with 15+ years of experience and 7,500+ Upwork hours building, maintaining, fixing, and modernizing production web applications.
I work comfortably with both modern JavaScript stacks and established PHP applications.
• React / Next.js: dashboards, portals, SaaS features, forms, APIs and frontend development
• Node.js / NestJS: REST APIs, backend services, authentication, business logic and integrations
• PHP: Core PHP, Laravel, CodeIgniter, Symfony and legacy application modernization
• WordPress / WooCommerce: custom functionality, plugins, integrations and maintenance
• Databases: MySQL, MongoDB
• APIs & Integrations: REST APIs, webhooks, Stripe, payment systems and third-party services
• AI Integration: OpenAI, Claude and other AI APIs for chat, automation and application features
• SaaS Development: subscriptions, roles & permissions, dashboards, notifications, file management, reporting and audit logs
• DevOps / Deployment: Linux, Nginx, PM2 and Git
I can help with:
• Building new full-stack features
• Fixing difficult bugs and production issues
• Improving existing React / Next.js applications
• Building Node.js / NestJS APIs
• Maintaining and extending PHP applications
• Modernizing legacy systems without unnecessary rewrites
• Integrating Stripe, Twilio, APIs, webhooks and external services
• Adding AI-powered features to existing applications
• Improving performance, security and maintainability
My strongest area is joining an existing codebase, understanding it quickly, finding the real problem, and delivering practical production-ready changes.
Available for ongoing development, maintenance, integrations, modernization and long-term product work.
Symfony
PHP
Core PHP
Custom PHP
Laravel
CodeIgniter
MySQL
WordPress
API Integration
API Development
RESTful API
Stripe
JavaScript
TypeScript
React
Next.js
Node.js
NestJS
Full-Stack Development
Web Application Development
Zahid H.
Dhaka, Bangladesh
$18/hr
4.9
37 jobs
Is your PHP app slow, stuck on an old version, or running on a badly configured server? I fix exactly that, and build new systems that don't break down the road.
I'm Zahid, a Laravel & Symfony specialist with 5+ years of experience delivering backend systems for SaaS platforms, government organizations, and international businesses. I don't just write code, I solve the real problems behind your technical requirements. 🚀
𝗪𝗵𝗮𝘁 𝗜 𝗦𝗼𝗹𝘃𝗲 𝗙𝗼𝗿 𝗬𝗼𝘂
🔹 Fix slow applications
I identify real bottlenecks, inefficient queries, N+1 issues, missing indexes, poor caching, and improve performance with measurable results.
🔹 Optimize & migrate databases
I restructure poorly designed databases, tune slow queries, add proper indexing, and handle full data migrations, across MySQL, PostgreSQL, and Oracle, with zero data loss and full integrity checks.
🔹 Upgrade legacy systems
Safe upgrades from PHP 5.x / 7.x → 8.x, Laravel and Symfony upgrades with full compatibility and minimal downtime.
🔹 Build scalable backend systems
SaaS platforms, REST APIs, real-time features (WebSockets), and complex business logic designed to scale.
🔹 Integrate payment gateways
I implement secure, reliable payment flows using Stripe, PayPal, Mope payments, and other regional or custom gateways — subscription billing, one-time payments, marketplace payouts, and refund handling all covered.
🔹 Solve server & deployment issues
Proper VPS setup, Nginx/Apache configuration, SSL, security hardening, and production stability.
🔹 Clean up messy codebases
Refactoring legacy systems into maintainable, structured, and developer-friendly code.
𝗦𝗲𝗿𝘃𝗶𝗰𝗲𝘀
🔹 Laravel & Symfony Development — SaaS, multi-tenant apps, REST APIs, WebSockets, queues, admin panels.
🔹 PHP & Framework Upgrades — PHP 5/7 → 8.x, Laravel 5–12, Symfony version upgrade.
🔹 Wordpress — Wordpress development, Wordpress bugs fix, Wordpress upgrade.
🔹 Legacy PHP Modernization — refactoring, security patching, technical debt reduction.
🔹 API & Third-Party Integration — REST APIs, webhooks, Twilio, and custom service connections.
🔹 Performance Optimization — query tuning, Redis/Memcached caching, N+1 fixes, code refactoring.
🔹 Database Optimization & Migration — schema redesign, indexing, query optimization, cross-platform data migration (MySQL, PostgreSQL, Oracle)
🔹 Payment Gateway Integration — Stripe, PayPal, Mope payment, subscription billing, marketplace payouts, webhook handling.
🔹 VPS & Server Setup — cPanel, WHM, Nginx, Apache, SSL, DNS, mail server, firewall configuration.
🔹 Server & Hosting Migration — zero-downtime transfers, database migration, DNS cutover.
𝗪𝗵𝘆 𝗖𝗹𝗶𝗲𝗻𝘁𝘀 𝗖𝗵𝗼𝗼𝘀𝗲 𝗠𝗲
🔹 Code + Server — One Person
I own both the application and the infrastructure it runs on. No gaps between your developer and your sysadmin.
🔹 Government & Enterprise Delivered
I've built production systems for government organizations and national enterprises, where reliability, security, and accountability are non-negotiable.
🔹 Performance You Can Measure
I don't just say "it's faster." I give you real numbers, query times, page load speeds, server response metrics, before and after.
🔹 Long-Term Code Quality
Clean architecture, SOLID principles, and full documentation so any developer can maintain what I build.
🔹 Global Availability
Flexible hours covering US, European, and Middle Eastern time zones.
𝗧𝗲𝗰𝗵 𝗦𝘁𝗮𝗰𝗸
🔹 Backend: PHP, Laravel, Symfony, CodeIgniter, REST APIs, WebSockets, Cron Jobs, Queue Workers, Eloquent ORM, Doctrine ORM, JWT Authentication, Mail Integration
🔹 Database: MySQL, PostgreSQL, Oracle DB, SQL, Database Optimization, Database Migration
🔹 Server: VPS, Dedicated Server, Shared Hosting, cPanel, WHM, Plesk, CyberPanel, DirectAdmin, Nginx, Apache, OpenLiteSpeed, Linux (Ubuntu, CentOS, Debian, AlmaLinux), Windows Server, Docker, CI/CD, GitHub Actions
🔹 Frontend: React.js, Next.js, Vue.js, JavaScript, Tailwind CSS, Bootstrap, base44
🔹 API & Third-Party: Payment Gateway Integration, SMS Gateway Integration, Chatbot, Geo-Location APIs, Twillo APIs.
🔹 CMS & E-commerce: WordPress, Wordpress Theme, Wordpress Plugin, Shopware, Grav CMS
Tell me your situation, slow app, broken server, outdated codebase, or a new build. I'll give you a clear plan, honest timeline, and get it done right.
Symfony
PHP
Laravel
API Development
API Integration
CodeIgniter
Database Optimization
MySQL
PostgreSQL
Data Migration
Virtual Private Server
cPanel
Linux System Administration
Docker
SaaS Development
Payment Gateway Integration
Websockets
WordPress
React
Next.js
Nikunja Behari G.
Tangail, Bangladesh
$20/hr
4.7
34 jobs
Legacy PHP apps that crash, slow down, or that nobody wants to touch — I take them over and make them stable. 13+ years in Symfony, Laravel, Python and DevOps, with 6,900+ hours and 100% Job Success on Upwork.
Most of my work starts the same way: an existing production system, an original developer who is gone, and a client who needs it to just work again. I read unfamiliar codebases fast, find the real cause instead of patching symptoms, and leave the system in a state the next person can maintain.
WHAT I DO
• Rescue & stabilize production apps — crashes, broken deploys, silent failures
• Symfony & Laravel development and legacy upgrades (PHP 5 to 8, Symfony 2 to 6)
• REST API development and third-party integrations
• Performance tuning — Redis caching, Elasticsearch, query optimization
• DevOps — Docker, AWS, DigitalOcean, Linux, CI/CD, RabbitMQ workers & schedulers
• ERPNext / Frappe customization, deployment and integrations
PROOF THAT CLIENTS KEEP ME
My two longest engagements ran 1,463 hours and 1,431 hours with the same clients — one of them for over three years. Across 26 contracts I average around 260 hours per client, because the work does not come back broken.
RESULTS I'VE DELIVERED
• Migrated and dockerized a legacy Symfony 3 application into a reproducible local + production setup
• Cut response times on a high-traffic directory platform with Redis caching and Elasticsearch tuning
• Fixed multi-party WebRTC stability on iOS after months of intermittent dropouts
• Resolved queue and worker failures in ERPNext following a server migration
BEST FIT FOR
• Existing systems that need rescuing, upgrading or scaling
• Apps hitting performance or reliability limits
• Long-term maintenance and ongoing development partnerships
Not a fit for: brand-new WordPress sites, template theme work, or one-hour "just make it work" fixes with no access to the codebase.
If you have a live system that needs someone who can step in, understand it, and make it solid — send me the details and I'll tell you honestly whether I'm the right person.
Tech: PHP · Symfony · Laravel · Python · Frappe/ERPNext · Node.js · React · Vue · Angular · MySQL · Redis · Elasticsearch · RabbitMQ · Docker · AWS · DigitalOcean · Linux · REST API · CI/CD · WebRTC
Symfony
PHP
Laravel
ERPNext
ERP Software
REST API
Python
Docker
MySQL
Amazon Web Services
Linux System Administration
CI/CD
Redis
Node.js
React
Shamim H.
Dhaka, Bangladesh
$30/hr
4.2
371 jobs
With over 14 years of experience, I specialize in transforming complex business requirements into scalable web applications that drive real revenue growth. My expertise spans full stack development, AI integration, and payment solutions, ensuring that every project I undertake is both innovative and robust.
Core Expertise & Skills
Backend Development
1. PHP: Developing robust applications since 2007
2. Laravel: Building enterprise-grade applications since 2012
3. Livewire: Real-time interfaces for modern web apps
5. API Development: RESTful services handling millions of requests
6. Database Design: MySQL optimization for high-traffic systems
AI & Code Auditing
1. AI-driven code verification for enhanced accuracy
2. Comprehensive code reviews to ensure quality and security
3. Migrating legacy systems to AI-driven platforms for modern business needs
Payment Solutions
1. Stripe / Stripe Connect: Certified expert with 50+ marketplace integrations since 2014
2. Payment Orchestration: Designing and implementing complex payment systems
3. E-commerce: Complete online store development and optimization
Frontend & UI/UX
1. WordPress: Crafting dynamic websites since 2010
2. Modern CSS: Tailwind CSS, Bootstrap responsive design
3. Figma: Mastery in creating intuitive UI/UX designs
4. JavaScript: Dynamic interfaces and real-time functionality
6. Performance: Sub-3-second load times on complex applications
MCP Experience
1. Figma, WordPress, Laravel: Mastery in creating and managing complex projects
Additional Technologies
1. React.js, Python, Vue.js: Proficient in understanding and coding with AI assistance
Data Analysis & Visualization
1. Analytical insights for data-driven decision making
3. Creating visualizations to simplify complex data sets
Enterprise Integration
1. CRM Systems: Zoho CRM, custom business workflows
2. Marketing Automation: Email sequences, customer lifecycle management
3. Third-party APIs: Google services, social authentication, AI chatbots
Cloud & DevOps
1. AWS & Digital Ocean: Scalable infrastructure deployment
2. Laravel Forge: Automated deployment and server management
3. Git/GitHub: Version control and collaborative development
Professional Experience
1. Built 100+ web applications across various industries
3. Specialized in SaaS platforms and e-commerce solutions
4. Led development teams and mentored junior developers
4. Consulted for Fortune 500 companies and funded startups
Key Achievements
1. Generated $50M+ in client revenue through platforms I've built
2. Maintained 99.99% uptime across all production applications
3. Improved client conversion rates by 30-50% consistently
4. Recognized by Stripe as integration methodology contributor
5. My Development Approach I focus on building solutions that scale with your business growth.
Every project includes:
1. Future-proof architecture designed for expansion
2. Security best practices with PCI compliance when needed
3. Performance optimization for exceptional user experience
4. Comprehensive documentation for long-term maintainability
Ideal Project Types
1. SaaS application development and migration
2. E-commerce platforms with complex requirements
3. Payment system integration and optimization
4. Custom web applications for growing businesses
5. API development and third-party integrations
I work best with ambitious businesses ready to invest in quality solutions that drive measurable results. Ready to discuss your project? Let's build something exceptional together.
Google Analytics
MySQL
PHP
Laravel
API
Git
Twilio API
CodeIgniter
Magento
Intercom
Database Development
WordPress
Data Analysis
JavaScript
Stripe
Payment Gateway Integration
Nahid H.
Dhaka, Bangladesh
$35/hr
5.0
68 jobs
As a Top Rated Freelancer with over a decade of experience, I build secure, scalable backend systems for SaaS products, eCommerce platforms, and custom business applications. My expertise is in PHP backend development, modern API architecture, and AI workflow automation that helps businesses automate processes, improve productivity, and scale efficiently.
I specialize in developing robust applications with Laravel, Symfony, Yii, CodeIgniter, and Laminas (Zend), while also building backend services with Node.js and Go for high-performance applications.
What I Offer
⚙️ Backend Development
-PHP
-Laravel
-Symfony
-Yii
-CodeIgniter
-Laminas (Zend)
-REST API & GraphQL
-Microservices
-Authentication & Authorization
-Database Design & Optimization
-Payment Gateway Integration
🤖 AI Workflow Automation
-OpenAI, Claude & Gemini Integration
-AI Agents
-Workflow Automation
-Business Process Automation
-Document Processing
-AI Chatbots
-Custom AI Applications
-Internal AI Tools
🛒 eCommerce Development
-WooCommerce
-Magento
-OpenCart
-Custom eCommerce Platforms
-Subscription Systems
-Order & Inventory Management
-Payment Processing
-Shipping & Tax Integration
🔌 API & Third-Party Integrations
-Stripe
-PayPal
-Twilio
-SendGrid
-Google APIs
-CRM & ERP Integration
-Custom REST & GraphQL APIs
☁️ Cloud & Infrastructure
-AWS
-Docker
-GitHub Actions
-Linux
-Redis
-MySQL
-PostgreSQL
-Performance Optimization
Why Clients Work With Me
I build backend systems that are reliable, secure, and easy to maintain. Whether you need a Laravel application, a custom backend, API integrations, an eCommerce platform, or AI-powered workflow automation, I deliver clean, production-ready solutions designed for long-term growth.
With Top Rated status, 100% Job Success, and years of experience delivering successful projects, I focus on writing maintainable code, communicating clearly, and delivering on time.
If you're looking for a Backend Developer, PHP Developer, Laravel Expert, or an AI Workflow Automation Engineer, I'd be happy to discuss your project.
#CMS, #Wocoomerce, #Magento, #Joomla
Symfony
Amazon Web Services
LAMP Administration
Debian
Elasticsearch
Laravel
CodeIgniter
MySQL
HTML
JavaScript
PHP
Yii
WordPress
ClickUp
Tailwind UI
Mohammad A.
Dhaka, Bangladesh
$25/hr
4.2
83 jobs
Top Rated Plus freelancer with 17+ years of experience building backend systems, APIs, and internal tools for startups and enterprises worldwide. I specialize in PHP/Symfony backend development, third-party API integrations, and no-code/low-code platforms — plus growing expertise integrating OpenAI and chatbot technology into client workflows.
Core expertise:
-- Backend & APIs: PHP, Symfony, CodeIgniter, REST API design & documentation (Swagger)
-- No-Code/Low-Code: Bubble(Certified), Retool, Xano, Airtable (Certified)
-- Databases: MySQL, PostgreSQL, Firebase, Parse, Supabase
-- Integrations: Twilio, Salesforce, Xero, OpenAI API, payment gateways, Google Dialogflow
Directory Platforms: Brilliant Directories, eDirectory
Recent impact:
-- Built and maintain a large-scale classified platform — backend, data-scraping APIs, and --performance optimization
-- Delivered backend systems for a cleaning-services platform processing billions of records across web, iOS, and Android
-- Integrated OpenAI into a Bubble application for automated evaluation and structured feedback generation
-- Built a Dialogflow-based chatbot for a food delivery platform
-- Completed multiple Retool internal tool projects integrating APIs and databases to streamline client workflows
Whether you need a robust backend, a fast no-code MVP, a legacy system modernized, or AI capabilities integrated into your existing product, I deliver reliable, production-ready work — fast. Let's talk about your project.
PHP
API Integration
JavaScript
Web Application Development
API Development
Back-End Development
MySQL
PostgreSQL
Firebase
Low-Code Development
No-Code Development
RESTful API
Database Design
Payment Gateway Integration
Bubble.io
NoSQL Database
API Testing
JSON
Software Architecture
Directory
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Summa Linguae
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