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Job Description We are looking for a Senior Technical Lead / Architect Developer to help audit, improve, and lead the technical development of our international automotive marketplace platform. Our company exports used cars from Japan to customers worldwide. Our website currently contains 100,000+ vehicle listings and integrates with Japanese vehicle auctions and dealer inventory feeds. This role is ideal for an experienced engineer who can both design system architecture and actively contribute to coding. You will work directly with the business owner and help guide future development of the platform. About Our Platform Our system includes two main components: 1. Public Website (SEO Marketplace) Used by international customers to: browse fixed-price vehicle inventory search and filter listings view vehicle detail pages send inquiries calculate shipping costs generate invoices track orders browse import regulations This platform focuses heavily on SEO and organic traffic growth. 2. Private Auction Portal A separate member-only system where registered users can: access Japanese car auctions search auction inventory place bids manage deposits and invoices Auction data is updated daily through API feeds. Current Technical Stack The platform currently includes: Custom PHP codebase API vehicle inventory feeds Cloudflare CDN GoDaddy VPS hosting WordPress blog (separate instance) External auction system on subdomain However, the platform requires: technical audit architecture improvements bug fixes performance optimization improved developer workflow Responsibilities The Technical Lead will: System Architecture Review and improve the current system architecture Design scalable infrastructure for large vehicle inventories Improve database structure and API integrations Optimize search and filtering performance Development Fix critical platform issues and bugs Implement core backend improvements Optimize performance and page speed Improve SEO page generation Technical Leadership Guide and review work of other developers when needed Establish coding standards and deployment processes Recommend best technologies and frameworks Platform Optimization Improve scalability for large inventory datasets Optimize system for SEO-driven traffic Improve reliability of API integrations Required Experience Candidates should have strong experience with: Large marketplace or eCommerce platforms PHP / Laravel or modern backend frameworks REST APIs and third-party integrations Database architecture (MySQL / PostgreSQL) High-performance search and filtering systems Server architecture and cloud environments Experience working with high-inventory marketplaces (50k+ listings) is strongly preferred. Nice to Have Experience with automotive marketplaces Experience with large SEO-driven websites Knowledge of scalable frontend frameworks ([login to view URL] / Vue) Experience working with API data feeds Engagement Type Initial engagement will focus on: platform audit bug fixing architecture improvements This may evolve into long-term technical leadership for the project. Estimated commitment: 10–30 hours per month initially. Important Please include in your proposal: Examples of large marketplace or eCommerce platforms you worked on Your experience with high-scale database systems Your preferred technology stack for a platform like this
Project ID: 40364602
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100 freelancers are bidding on average $53 USD/hour for this job

Hello, Good Day! I’m very interested in supporting your automotive marketplace as a Technical Lead/Architect. This is exactly the kind of high-scale, API-driven platform I specialize in—where performance, data structure, and long-term scalability are critical. I have experience working on large marketplace systems involving high-volume listings, complex filtering, API data feeds, and SEO-driven architectures. I’ve handled backend systems using PHP/Laravel and modern stacks, optimized database performance (MySQL/PostgreSQL), and improved search efficiency for large datasets through indexing strategies, query optimization, and caching layers. For your platform, I would begin with a technical audit, identifying bottlenecks in database structure, API ingestion, and search performance. From there, I’d propose a scalable architecture—potentially modernizing parts of the system (e.g., Laravel services or microservices approach), improving API reliability, and optimizing SEO page generation for better indexing and speed. I’d also help establish cleaner deployment workflows, coding standards, and guide other developers where needed. I’ve worked on systems with large inventories and real-time data syncing, where stability and performance directly impact revenue and user experience. My focus is always on building maintainable, scalable systems rather than short-term fixes. I’d be happy to review your current setup and outline a clear improvement roadmap. Kind Regards, Rinsad
$40 USD in 40 days
9.8
9.8

With over a decade of experience in full-stack architecture and high-scale systems, I understand the need for a Senior Technical Lead to audit, improve, and lead the technical development of your international automotive marketplace platform. As a seasoned developer with a track record of scaling for over 1 million users, I see the value in optimizing your current system architecture, fixing critical platform issues, and enhancing search and filtering performance to meet the demands of your high-inventory marketplace. One strategic insight I can offer is leveraging modern backend frameworks like Laravel to streamline API integrations and improve database structure for better performance. My past success in building and scaling platforms with large inventories showcases my ability to handle the complexities of your project while guiding future development under your guidance. I encourage you to reach out to discuss how I can contribute towards the success of your platform through efficient and secure technical leadership. Let's connect to strategize the roadmap for your automotive marketplace and ensure its scalability and performance meet your business goals.
$56 USD in 15 days
9.1
9.1

Hi, To audit and improve your automotive marketplace platform, I'll conduct a thorough technical review and implement necessary enhancements. This will include: - Reviewing and improving the current system architecture. - Fixing critical platform issues and bugs. - Optimizing performance and page speed. - Enhancing SEO-driven traffic capabilities. I will approach this by analyzing the existing codebase, identifying bottlenecks, and applying best practices for scalability and performance. Ready to start once you provide access to the platform and any relevant documentation. Thanks!
$55 USD in 40 days
8.3
8.3

Hi, This is Elias from Miami. I checked your project description and understand you’re looking for a Senior Technical Lead to audit and improve your automotive marketplace platform. It sounds like a great opportunity to enhance performance and functionality. I’ve worked on several similar systems and understand the key technical challenges involved. I can help ensure your platform is optimized and scalable, leveraging my expertise in LAMP stack technologies. I’d be happy to go through the details and suggest the best technical approach. I have a few questions to get a better understanding: Q1 – What specific areas of the platform are you looking to audit or improve? Q2 – Are there any existing integrations or APIs that need special attention? Q3 – What user roles should be considered in the architecture for your marketplace? Looking forward to hearing from you.
$40 USD in 30 days
8.0
8.0

Interesting project, I will audit your PHP codebase, optimize MySQL queries for 100k+ listings, and improve search/filtering performance across both the public marketplace and auction portal. For inventory at this scale, I will profile your heaviest queries — likely vehicle search with multi-filter facets — and implement composite indexes plus query caching to cut response times significantly. Proper database partitioning will also keep SEO page generation fast as listings grow. Questions: 1) Is the current PHP codebase using any framework, or is it fully custom? 2) How are API auction feeds structured — full daily dumps or incremental updates? Looking forward to your response. Best regards, Kamran
$51 USD in 40 days
8.5
8.5

Hi, I have strong experience with Php, Laravel and Code ignitor. I’ll develop robust and secure web application just the way you want. I can handle any updates you need. You can check my reviews to see the quality of my work, I will share my previous application in private chat. Lets connect in chat so that We discuss further. With Regards, Sai
$40 USD in 40 days
7.8
7.8

Hello, We've thoroughly reviewed your project details for the Automotive Marketplace LAMP Architect role. It's clear you require an experienced technical lead to refine your platform's architecture and enhance its functionality. We've successfully completed similar projects, notably a high-inventory eCommerce platform where we optimized the architecture for scalability and SEO performance. Our experience aligns perfectly with your needs, from PHP and Laravel frameworks to advanced database management and API integrations. With over 8 years of experience and recognition as the top 1% on Freelancer.com, we bring a wealth of knowledge in developing scalable, SEO-driven platforms. Our expertise in full-stack development and cloud-native architectures ensures robust solutions tailored for large datasets and high traffic. We invite you to message us with further details. Upon receipt, we will craft a detailed proposal specifically for your project, delivered within 24 hours. Looking forward to the opportunity to collaborate. Best regards, Puru Gupta
$70 USD in 40 days
7.1
7.1

Hi, I have analyzed your automotive marketplace needs. Managing 100k+ listings requires a shift from standard CRUD to a high concurrency Software Architecture. At Plan D Studios, we bring 12+ years of experience in API Development and Database Management, specifically optimizing large scale inventories for global trade. My Strategic Approach: The Audit: I'll start by profiling your MySQL slow logs and LAMP stack bottlenecks. With 100k+ vehicles, the challenge isn't just storage it's search indexing and SEO performance. Architecture: We recommend transitioning to a Laravel based micro service logic to handle daily auction API feeds without locking the public site's database. Performance: Implementing elastic search or optimized indexing to ensure filters (make/model/year) remain instantaneous. We handle all Full Stack Development in house. I’ve led similar builds where we synced high volume external feeds into SEO optimized frontends. Since you're scaling, are you planning to migrate from the VPS to a more elastic cloud environment like AWS to better handle those daily API spikes? Regards, Haider
$50 USD in 40 days
7.3
7.3

Having successfully developed and maintained several high-inventory marketplaces, I am confident that I am the right fit for your automotive marketplace project. With a strong command over modern backend frameworks such as PHP and Laravel, I can bring substantial improvements to your existing codebase and enhance your platform's overall performance and stability, ensuring it is equipped to handle even larger vehicular inventories in the future. Throughout my career, I have demonstrated a sharp acumen for designing scalable infrastructures, optimizing database structures, and integrating third-party APIs seamlessly. This aligns perfectly with your need for architectural improvements, search optimization, and API reliance. Moreover, being adept at server architecture and cloud environments, I can ensure efficient hosting alternatives that maximize uptime combined with rapid page loading speeds. In addition to bringing over years of experience working with large marketplace systems like yours, my team at SoftwareLinkers also specializes in upholding industry-best coding standards and establishing robust developer workflows. We believe in offering holistic, end-to-end solutions to our clients which involve not just fixing bugs but also enhancing core backend functionalities, improving SEO performance as well as enhancing the reliability of API integrations - all of which were listed as key responsibilities for this role.
$60 USD in 40 days
6.6
6.6

Hello Sir, Would you like to see a demo of our proposed solution even before any commitment? I am an experienced architect who specializes in optimizing large-scale automotive marketplaces, ensuring seamless performance and scalability in every phase of development. Let's discuss this further to create a detailed plan and demo that will elevate your platform's technical capabilities and user experience. Regards, Smith
$55 USD in 40 days
6.4
6.4

Hello, your need for a technical lead who can audit and re‑architect a high‑inventory automotive marketplace stands out clearly, especially with 100,000+ vehicle listings and multiple API feeds. I’ve led similar high‑scale marketplace rebuilds, including restructuring a 250k‑product auto‑parts platform and delivering a MySQL optimization that reduced query latency by 60%. I see the core challenge here not just in PHP code cleanup but in unifying fragmented systems, stabilizing auction‑feed ingestion, and redesigning search/indexing so it scales without harming SEO performance, an area where many platforms unknowingly lose organic visibility. I’ll map your current LAMP stack, profile bottlenecks, redesign schema relationships, and implement a clean API‑processing pipeline. I’ll also introduce a predictable deployment workflow and code standards to help future contributors onboard without friction. Before starting the audit, I need clarity on data ingestion frequency, your VPS resource allocation, and whether the auction system exposes rate limits. I can begin with an initial architecture audit and deliver actionable recommendations within days. Best regards, John allen.
$40 USD in 29 days
6.0
6.0

Hi, I have strong experience in PHP, Laravel, MySQL/PostgreSQL, high-scale marketplace platforms, API integrations, and performance optimization for large inventory systems. I’ve worked on platforms handling large datasets and SEO-driven traffic, where I improved architecture, optimized search/filter performance, stabilized API feeds, and introduced cleaner deployment workflows, so I can audit your current system and evolve it into a scalable, maintainable architecture that supports 100k+ listings efficiently. You can expect clear communication, structured technical direction, and hands-on contribution to stabilize and scale your platform while improving performance and SEO outcomes. Best regards, Juan
$40 USD in 40 days
5.8
5.8

Hello! I am a Florida-based senior software engineer with a strong focus on PHP, MySQL, and LAMP stack development. I've carefully reviewed your project description and I'm excited about the opportunity to help audit and improve your automotive marketplace. With about 15 years of experience in building scalable systems, I understand the nuances of creating robust applications that not only function well but also deliver real value to users. To ensure I meet your expectations, could you please clarify the following questions to help me better understand the project? 1. What specific areas of the current architecture are you looking to audit? 2. Are there any key performance metrics or user feedback you want to address in this project? 3. What is your timeline for the audit and implementation phases? I have successfully worked on projects like a custom vehicle listing platform, an e-commerce site for auto parts, and a robust API for a vehicle history service. I always prioritize clear communication and structured milestones, ensuring that the final product aligns with your vision. Let’s connect and discuss how we can enhance your marketplace for maximum efficiency and user engagement. I'm dedicated to delivering the best results for your project. Looking forward to hearing from you! -James
$50 USD in 10 days
5.8
5.8

Hello, I understand the need for a Senior Technical Lead/Architect Developer to enhance your international automotive marketplace platform. With a strong background in PHP/Laravel, REST APIs, and database architecture, I am confident in my ability to improve system architecture, optimize performance, and guide future development. My experience with large eCommerce platforms and high-inventory marketplaces aligns well with your project requirements. I am ready to conduct a thorough platform audit, address critical issues, and propose scalable solutions. Let's work together to elevate your platform and drive success. Looking forward to the opportunity to collaborate and contribute to your project. Best regards,
$40 USD in 40 days
5.2
5.2

Hello, Will the platform require multi-region setup for hosting to ensure optimal performance for international users? Are there specific security requirements for handling customer data and transactions securely within the system architecture? I take full ownership of executing the technical improvements and leading the development of the automotive marketplace platform. Direct and efficient communication is guaranteed. I understand the value of your investment and will treat the project as my own to ensure stable, production-grade delivery. Best regards, Yurii
$55 USD in 40 days
1.6
1.6

With over a decade of experience shaping the technical architecture and development of large-scale platforms like yours, I am confident I can bring immense value as your Senior Technical Lead. Specifically, my track record includes developing successful marketplace and eCommerce platforms, improving database structure and API integrations, as well as optimizing SEO-driven website performance – all of which are pillars of your project One distinguishing aspect of my work is my emphasis on clean, scalable, and user-centric solutions. This ensures that systems not only perform optimally but also harmonize with the users' needs – a critical consideration given your diverse audiences spanning from international customers to registered users with unique specifications. Moreover, my familiarity with high-inventory marketplaces guarantees that I'm well-versed in handling databases much larger than your current 100k+ vehicle listings.
$55 USD in 2 days
1.4
1.4

Hi Mate , Good morning! I’ve carefully checked your requirements and really interested in this job. I’m full stack node.js developer working at large-scale apps as a lead developer with U.S. and European teams. I’m offering best quality and highest performance at lowest price. I can complete your project on time and your will experience great satisfaction with me. I’m well versed in React/Redux, Angular JS, Node JS, Ruby on Rails, html/css as well as javascript and jquery. I have rich experienced in Website Design, Laravel, LAMP, API Development, SEO, PHP, HTML, PostgreSQL and MySQL. For more information about me, please refer to my portfolios. I’m ready to discuss your project and start immediately. Looking forward to hearing you back and discussing all details.. A fast response is appreciated
$50 USD in 23 days
0.0
0.0

Hello, and thanks for sharing the details about your automotive marketplace platform. I’ve led development on large-scale eCommerce and marketplace systems, including platforms exceeding 80k+ active listings, and I’m confident in bringing both architectural oversight and hands-on LAMP/PHP development to strengthen your system. I can provide a full audit, resolve critical issues, modernize the architecture, and improve the search, filtering, and SEO-driven performance your public site depends on. I’ve also designed SQL structures for high‑volume datasets and have extensive experience integrating complex API feeds similar to Japanese auction systems. For a platform like yours, I typically lean toward modernizing PHP into a Laravel-based ecosystem with optimized MySQL/PostgreSQL architecture while enhancing deployment workflow and developer efficiency. Best regards!
$40 USD in 38 days
0.0
0.0

Hello, Will the real-time data feed require sub-second latency across all users? Are you planning to host this within a single region or multi-region setup? I take ownership of execution and focus on stable, production-grade delivery. Communication will be direct and efficient. Let’s align on the details and move forward. Best regards, Vitalii
$55 USD in 40 days
0.0
0.0

Hello, Thank you for sharing the detailed project requirements. As DemiVision, LLC, we specialize in architecting and scaling high-traffic marketplace platforms, and we’re excited about the opportunity to support your international automotive marketplace. We have extensive experience leading technical teams for large eCommerce and marketplace sites—most notably, we architected a custom PHP/Laravel platform handling over 200,000 live SKUs and 50,000+ daily users. Our expertise includes advanced database design (MySQL/PostgreSQL), optimized search/filtering at scale, REST API integrations, and implementing robust, SEO-driven architectures. We have also managed migration and improvement projects for automotive and equipment marketplaces with heavy inventory, auction, and third-party feed integrations. For your platform, we would begin with a comprehensive technical audit, focusing on system bottlenecks, database schema optimization, and codebase maintainability. From there, we’d design a scalable architecture to handle large inventory loads and improve performance for both public and private-facing components. Our preferred stack would include modern PHP (Laravel), optimized MySQL/PostgreSQL, and containerized hosting for flexibility and scalability. We’re passionate about building reliable, high-performing marketplaces and look forward to helping you achieve your platform goals.
$40 USD in 90 days
0.0
0.0

Tokyo, Japan
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