Senior PHP Developer for API Deployment and Integration in CS-Cart Multi-Vendor

@Microlent

Hello, I am Dr. Rajesh Rolen, PhD in Computer Science & Engineering, with experience of over 20+ years in API Development, API Integration, PHP, MySQL, REST API, MariaDB, XML As a preferred freelancer in the top 1%, I have done 400+ projects here on freelancer.com, I have 4.9 ratings out of 5 on average, which showcases my quality of work and timely delivery. Key Highlights: - Free Hosting Support on the Cloud or any desired platform. - Free 3 months of post-delivery support to ensure that our client doesn’t face any challenges after the launch of the project. - Free Dedicated tester on projects to ensure quality delivery, so clients don’t need to act as a tester. - 10+ Years experience UI/UX team to ensure intuitive UI. Portfolio: https://www.freelancer.com/u/Microlent Please open the chat and send me a message, so we can have a more detailed discussion about the project to give you the project timeline and cost. Thank you for considering my services. I look forward to engaging in a productive conversation and understanding how I can be of assistance in bringing your project to life. Regards Rajesh Rolen

@gotucat

Hi, I reviewed your need for a CS-Cart Multi-Vendor developer to deploy and wire REST JSON integrations without changing the platform core. You want isolated PHP/Smarty add-ons via CS-Cart hooks, plus REST API connections to payment gateways, Frenet shipping, and an ERP. I’ll build self-contained add-ons that use cURL for JSON exchange, create and index MySQL/MariaDB tables for fast search queries, and keep everything removable with no footprint. I’ll also configure VPS setup for PHP-FPM, Redis, OPCache, SSL, and add lightweight hardening for stable API throughput. I focus on clean Git-delivered code, documented setup, and staging-validated end-to-end data exchange, with query plan tuning for benchmarks. Let’s discuss here now.

@a4logic

Hello, With over a decade of experience in the tech industry, I'm confident that I can make a significant impact on your CS-Cart Multi-Vendor project. My extensive understanding of PHP and Smarty, along with my proficiency in working with CS-Cart hooks, ensures that I can seamlessly deploy and integrate the necessary external services you require without disturbing the platform core. Additionally, my expertise in MySQL / MariaDB schema tuning guarantees fast and efficient query processing, even under high-volume demands. Working on your project means more than just developing self-contained add-ons; it's about ensuring exceptional performance through the entire system. I have successfully configured various hosting environments like Hostinger/AWS to ensure smooth operations by utilizing PHP-FPM pools, Redis, OPCache, SSL as well as performing basic hardening and ongoing resource monitoring. Moreover, I have been delivering top-notch software solutions while maintaining clean code practices throughout the development process, leaving no footprints when an add-on is disabled and providing clear documentation for easy future maintenance. With me onboard, you will not only get a dedicated developer but also a reliable partner for long-term support. Let's discuss how we can turn your vision into reality while exceeding your expectations at each step of the journey. Thanks!

@ykarora26

With extensive experience in CS-Cart Multi-Vendor development, I understand your need to integrate external services seamlessly without altering the platform core. Skilled in creating REST integrations, building add-ons in PHP/Smarty, and optimizing MySQL databases, I am well-equipped to meet your requirements. How critical is the timeline for integrating these external services into your marketplace? Regards, Yogesh Kumar

@installerpoint

Good Day! I have carefully analyzed your project and can develop isolated CS-Cart Multi-Vendor add-ons using hooks, PHP/Smarty, REST/JSON cURL integrations, and optimized MySQL/MariaDB schemas without modifying the core. I can also configure Hostinger/AWS VPS environments with PHP-FPM, Redis, OPCache, SSL, hardening, monitoring, and provide Git-based source code with clear deployment documentation. I am eager to contribute my expertise and deliver top-notch results for your project. Let's discuss the project further in chat or let's have a quick call! Best regards, M Adeel.

@extreamcode

Hello, I can see the real challenge here: keeping CS-Cart Multi-Vendor clean while making several external systems behave like they were built into it from day one. That’s exactly the kind of integration work I enjoy. I’ve built self-contained PHP add-ons, worked with hooks, JSON REST APIs, cURL, MySQL/MariaDB tuning, and VPS setups where performance and upgrade safety mattered just as much as the feature itself. I’ll keep everything isolated from the core, document the flow clearly, and make sure each add-on installs cleanly, exchanges data reliably, and stays easy to maintain. I’ve shared an initial estimate based on your description, and once we go over a few technical or functional details, I’ll confirm the exact cost and delivery schedule. I can also review the VPS layer for PHP-FPM, Redis, OPCache, SSL, and basic hardening so the marketplace stays fast under load. A couple of things I’d love to confirm: which CS-Cart version are you on, and do the ERP/shipping/payment APIs already have stable sandbox access? Also, should the integration logs live inside the add-on or in a separate admin screen? Looking forward to your reply so we can finalize the exact plan. Best regards, Asad

@managersingh

Hi, I’m experienced with CS-Cart Multi-Vendor development and can build isolated PHP/Smarty add-ons using hooks without modifying the core. I can handle JSON REST integrations via cURL, Frenet/shipping, payment gateways and ERP connections, plus MySQL/MariaDB tables, indexes and query optimization. I can also configure Hostinger/AWS VPS, Redis, PHP-FPM, OPCache, SSL and monitoring, with Git source and clear documentation. Ready to build this upgrade-safe and performance-focused. Singh

@seefattechnologi

A CS-Cart integration that touches the platform core is the fastest way to break every future upgrade, so keeping everything as clean, isolated add-ons is the real discipline this project needs. I have built self-contained CS-Cart add-ons using hooks in PHP and Smarty before, without modifying core files, and wired REST integrations over cURL exchanging JSON with payment gateways, shipping providers, and ERPs. Any new tables or indexes would be designed specifically for high-volume query performance, tested against real load before going live. On the infrastructure side, I would configure PHP-FPM pools, Redis, OPCache, and SSL on your Hostinger or AWS VPS, with basic hardening and monitoring in place, and hand over everything through Git with clear setup instructions so upgrades stay simple. Quick question, is Frenet's API already documented and accessible for a staging environment, or does that access still need to be arranged? Please ping me to get started and provide you with great QUALITY results. Thanks!!!

@sabaehsan

Greetings, It sounds like you're looking for a seasoned CS-Cart Multi-Vendor developer to handle the integration of various external services into your marketplace, all while keeping the core untouched. I can help you with that. My approach would involve creating self-contained add-ons that utilize CS-Cart hooks effectively, enabling seamless data exchange with payment gateways and shipping providers through REST APIs. I have a solid background in tuning MySQL/MariaDB databases for high-volume queries, ensuring that all new relational tables and indexes are optimized for performance. Additionally, I can configure your VPS environment to ensure everything runs smoothly, from PHP-FPM to SSL hardening. With a focus on delivering clear documentation and easy installation, my goal is to make sure your integrations are hassle-free and efficient. Best regards, Saba Ehsan

@ozbas

Dear Client, I am highly proficient in CS-Cart Multi-Vendor development, with extensive expertise in building self-contained PHP/Smarty add-ons that leverage CS-Cart hooks without modifying the platform core. I excel in designing optimized MySQL/MariaDB schemas tailored for high-volume, low-latency queries, ensuring system scalability and robust search performance. My approach includes implementing clean, one-click installable add-ons that leave no residual footprint when disabled. I am experienced in creating secure RESTful API integrations using cURL that exchange JSON data seamlessly with payment gateways, shipping services like Frenet, and ERP systems. I can also configure VPS environments (Hostinger/AWS) to optimize PHP-FPM pools, Redis, OPCache, SSL setup, and essential security hardening measures, coupled with resource monitoring for stability. I commit to delivering fully documented source code with comprehensive setup instructions via Git, facilitating hassle-free platform upgrades and maintenance. I understand your acceptance criteria and am confident in meeting your performance benchmarks through careful query tuning and rigorous testing in staging environments.

@toriquldev123

Hello Dear, I’m Md Toriqul Islam, and I’m excited to partner with you & I can dive into your CS-Cart project immediately. I have rich experience in CS-Cart Multi-Vendor, PHP, Smarty, MySQL, MariaDB, REST APIs, cURL integrations, VPS configuration, and performance optimization. I understand you want isolated CS-Cart add-ons using hooks, connecting payment gateways, Frenet, shipping services, and ERP systems without modifying the platform core. I am skilled in custom add-on development, relational database design, indexing, PHP-FPM, Redis, OPCache, SSL, Git, and server hardening. I’ll build upgrade-safe integrations, validate API exchanges in staging, optimize query plans, document setup, and ensure clean installation and removal. Looking forward to reviewing your current CS-Cart setup and API requirements. Best regards, Md Toriqul Islam

@megauravpanwar

Handling external ERP, payment, and Frenet shipping webhooks in CS-Cart Multi-Vendor requires strict adherence to the event dispatcher hook system to guarantee seamless platform upgrades without core modifications. To prevent database bottlenecks from high-volume synchronization, I will implement asynchronous queue processing using Redis alongside dedicated MariaDB custom tables optimized with composite indexes and InnoDB tuning. • Isolated add-ons package with zero core footprint • cURL handlers with robust error logging and exponential backoff retry logic • Full VPS optimization across PHP-FPM pools and OPCache I recently built a multi-tenant marketplace processing millions of daily transactions with zero downtime during peak loads. Let us jump on a quick call to map out the API milestones and performance benchmarks. Gaurav Panwar Senior Full-Stack & System Architect (15+ Yrs Exp)

@denisSolution

Hi, I'm Denis, and I’ve worked with CS-Cart Multi-Vendor on projects that required tight integrations with external services while keeping the core platform untouched. I understand you need clean, self-contained add-ons that handle REST communication with payment gateways, shipping providers, and an ERP via JSON, all while maintaining fast MySQL/MariaDB performance. I’d start by reviewing the existing marketplace setup to map out the required hooks and data flows. The new add-ons will be built in PHP/Smarty with isolated tables and optimized indexes to avoid slowing down search queries. For the VPS, I’ll configure PHP-FPM, Redis, OPCache, and SSL, then set up monitoring to catch issues early. Each add-on will be version-controlled, installable with one click, and fully reversible without leaving traces. A common risk here is API rate limits or unexpected payload changes from third parties. I’d handle that by adding retries with exponential backoff, logging failed requests, and building simple admin tools to replay them. Another point is keeping the database lean—indexes will target the specific queries the integrations actually use, not just generic optimizations. I can start working right away. Let's connect and discuss the details. Thanks, Denis.

@kasibleiz

Hi, It's a pleasure to meet you. I completely understand how stressful it can be when a marketplace slows down or when core updates break custom integrations. You need a clean, rock-solid setup where add-ons are fully isolated, leaving your core untouched and ensuring hassle-free future upgrades. With deep experience in CS-Cart Multi-Vendor hooks, PHP/Smarty, custom DB indexing, and high-performance VPS setup (Redis, OPCache), I can seamlessly integrate your payment gateways, Frenet shipping, and ERP while keeping load times blazing fast. Quick clarification: Do you already have the complete API documentation and sandbox credentials ready for your specific ERP and shipping provider? This is a highly important project for both of us, and I want to make sure we get it right from the start. Let's have an online meeting to discuss the further development plan and delivery ETA. I'm ready to start and get this done immediately.

@ShekhWebDev21

Hi, I'm a CS-Cart Multi-Vendor developer specializing in core-safe, hook-based add-ons - exactly the approach you need for long-term upgrade stability. What I bring: ✔ Self-contained PHP/Smarty add-ons (single-click install, zero footprint when disabled) ✔ REST/JSON integrations via cURL -payment gateways, Frenet shipping, ERP systems ✔ Custom MySQL/MariaDB schema design with indexing tuned for high-volume search ✔ VPS setup (Hostinger/AWS): PHP-FPM pools, Redis, OPCache, SSL, hardening, monitoring ✔ Full Git source + clear documentation for smooth future upgrades I test all integrations end-to-end on a staging copy before deployment, and I'm comfortable benchmarking page load/query plans against agreed targets. Could you confirm which payment gateway and ERP system are priority for phase one? Also happy to review your current CS-Cart version to flag any compatibility notes upfront. Ready to start.

@juanpablomacf

The constraint that matters most here is "without touching the platform core" - that means every integration has to live in isolated add-ons that hook cleanly and uninstall without leaving orphaned tables, settings, or Smarty overrides behind, which is where a lot of CS-Cart integrations quietly go wrong. I've worked with CS-Cart Multi-Vendor directly, building self-contained add-ons in PHP/Smarty that hook into the platform rather than modifying core files, so upgrades don't break custom logic. For REST integrations like Frenet or a payment gateway, I'd keep each service in its own add-on with its own config screen, so if one integration needs to be disabled or replaced later, it doesn't touch the others. For the schema work, I'd add new relational tables with proper indexing rather than extending existing CS-Cart tables directly - that keeps queries fast and keeps the add-on's footprint fully removable on disable. On the VPS side, I'd tune PHP-FPM pool sizing and OPCache based on your actual traffic pattern rather than generic defaults, since that's usually where "meets benchmark" turns into "actually holds up under load." A couple of questions: is the ERP integration one-way (pushing orders out) or does it also need to sync inventory/pricing back in? And do you already have staging credentials for the payment gateway and Frenet, or does sandbox access still need to be set up? Juan Pablo

@nancydeveloper

Hi , I have carefully reviewed your project requirements and am confident I can deliver a high-quality, scalable, and performance-driven solution that aligns perfectly with your goals. With over 7 years of experience in full-stack web development, I specialize in building robust, secure, and conversion-focused digital ecosystems rather than just standalone websites. Core Expertise & Technical Skills ✔ Custom Web Development: PHP, CodeIgniter, Python, MySQL ✔ Advanced WordPress: Custom Themes, Plugins, WooCommerce, Elementor ✔ Frontend & Design: HTML5, CSS3, JavaScript, jQuery, Figma/PSD to Pixel-Perfect HTML ✔ Optimizations: API Integration, Speed/Performance Enhancement, and Mobile-First Responsive Design ✔ Maintenance: Advanced Bug Fixing, Debugging, and Security Audits What I Bring to Your Project ✔ Clean, Scalable Architecture: Well-structured code built for long-term growth and SEO optimization. ✔ Performance-Driven Focus: Fast-loading, secure, and fully responsive across all devices. ✔ Business-Centric Approach: Designed to enhance user experience and deliver measurable business value. ✔ Seamless Collaboration: Clear communication, regular progress updates, and reliable post-launch support. Let’s connect and discuss how we can turn your idea into a powerful digital product that supports your business growth. I would be happy to get started immediately. Thank you.

@Zaiyan

I can create and document REST integrations for your CS-Cart Multi-Vendor marketplace to connect with payment gateways and shipping providers. My first step will be to outline the required data exchange processes and ensure we have clear specifications for the JSON format. Based in Toronto, I work quickly and am always available for any questions or updates.

@shayankhan333

Keeping every integration inside self-contained add-ons is the right call here, since Frenet and ERP webhooks tend to drift and you don't want core patches blocking upgrades. I'll build the Frenet, gateway and ERP bridges as isolated add-ons with their own tables and indexes, wire cURL/JSON with retry and logging, and tune PHP-FPM, Redis and OPCache on the VPS. Uninstall hooks will drop tables cleanly so nothing lingers. 1) Hostinger or AWS for the target VPS, and which ERP? 2) Expected orders per day for index sizing? Cheers Shayan