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I need to complete a SaaS subscription module written in PHP. The module is already partially implemented, with a substantial amount of existing code, and any continuation of the work must strictly respect the existing language (PHP), architecture, and defined implementation rules. Even if a solution technically works, the project will not be considered complete if these rules are not followed. It is extremely important to carefully read and understand the current implementation before continuing. The goal is to maintain the existing architecture and reuse the components that are already in place. New components must not be created for functionalities that already exist, in order to avoid code duplication. Required functionalities: Subscription registration with support for different billing periods (this occurs via webhook when the payment is effectively confirmed); Subscription cancellation: The cancellation is scheduled and only takes effect at the end of the current billing cycle. The user must be able to revert the cancellation while it is still in the scheduled period; Upgrade and downgrade of plans: Upgrade must be executed immediately; Downgrade must be scheduled and only completed when the billing cycle of the higher-priced plan ends; Downgrade cancellation: It must be possible to cancel a scheduled downgrade as long as it has not yet been applied. Architectural requirements: The solution must be modular, with no dependency on a specific project or payment gateway, so it can be reused and allows easy gateway replacement; The code must follow good software design practices, programming against abstractions rather than concrete implementations; Services and helpers must receive all required details via arguments, not through global or hardcoded dependencies. Requirements: Strong PHP knowledge is mandatory; Knowledge of best practices (SOLID, DRY) is desirable but not mandatory — technical guidance will be provided when necessary; This project offers an opportunity for professional growth, especially through the practical application of software engineering best practices.
Project ID: 40175234
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Active 3 mos ago
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27 freelancers are bidding on average $39 USD for this job

As a seasoned PHP developer with over 7 years of experience, I have extensive knowledge in building and maintaining complex web applications – a skillset that is perfectly aligned with your project requirements. Having handled diverse projects from eCommerce platforms to CRM systems – I am well-versed with developing modular, scalable, and high-performance solutions as per client specifications. One of the reasons you should choose me for your project is my strong grasp of API Integrations. Being able to create secure REST APIs for effective third-party integrations is a must-have skillset when working on a Subscription module. Furthermore, your emphasis on using no global or hardcoded dependencies resonates with my adherence to clean code practices and proper use of abstractions. Lastly, I would like to highlight the opportunity for professional growth this project offers. Applying software engineering best practices like SOLID and DRY in each project is not just a requirement, but also something I value greatly. By collaborating together, we can create an efficient solution that not only meets your current needs but also paves way for future scalability and maintainability. Let's initiate a conversation and discuss how I can help execute an exemplary SaaS Subscription Module for you!
$200 USD in 7 days
8.8
8.8

Hello I will expertly complete your SaaS subscription module in PHP. My proven experience in developing robust, scalable subscription systems ensures a secure, efficient, and fully functional implementation. I focus on seamless integration and delivering a high-quality, production-ready module promptly. Let's finalize your module with precision. Giáp Văn Hưng
$30 USD in 7 days
6.6
6.6

Hello, I understand you need to complete a SaaS subscription module in PHP, ensuring meticulous adherence to existing code and architecture. I have strong expertise in PHP and have successfully worked on similar SaaS projects, focusing on maintaining modularity and following best practices like SOLID and DRY. This led to significant improvements in code maintainability and reusability for my previous clients. ✅My Plan: - Review the existing implementation thoroughly to understand the current architecture. - Implement functionalities for subscription registration, cancellation, and plan upgrades/downgrades while reusing existing components. - Ensure the solution remains modular, without dependencies on specific projects or gateways. - Develop the functionalities in a way that all required data is received through parameters, avoiding global states. What specific billing periods do you want to support, and do you have a preferred payment gateway for the integration? Best regards, Hongqiang Chen
$100 USD in 1 day
5.0
5.0

Hello I am having 15+ years experience in PHP/MYSQL, C++, python and Flutter Development. I can help you to do this task very quickly. Thanks Venkateswaran
$20 USD in 7 days
5.2
5.2

As a tenured professional with over a decade of experience in web and mobile app development, I am confident that I possess the skills to complete your partially implemented SaaS subscription module in PHP, respecting the existing architecture diligently. My competency lies in understanding complex code bases and building upon them while maintaining adherence to defined implementation rules. Apart from my proficiency in PHP, I have an extensive background working with robust frameworks such as Laravel that emphasize SOLID, DRY principles. This perfectly suits your sought-after best practices approach, ensuring a modular and clean design to facilitate future replacement of gateways or scalability. Just as you desire, I have emphasized programming against abstractions rather than concrete implementations throughout my career. Having delivered more than 2000 successful projects, including several involving SaaS platforms and marketplaces, I fully appreciate the importance of meeting client-specific goals and maintaining 100% satisfaction till delivery. Your project aligns perfectly with my core skills and experience. Let's collaborate for a performance-optimized, user-centric solution that meets not just your technical requirements but also drives professional growth through applied software engineering best practices!
$15 USD in 7 days
4.9
4.9

With over 7 years of experience in web development and API integration, I am more than equipped to take on your SaaS subscription module project. My strong suit lies in my deep understanding of PHP, which is crucial for completing and respecting existing language, architecture, and implementation rules as you specified. My commitment to ensuring modular and reusable solutions without code duplication is an essential principle in my coding practice. This aligns perfectly with your architectural requirements for the project. Additionally, I strongly adhere to good software design practices like SOLID and DRY principles, making sure that the project follows abstractions rather than concrete implementations. This project is a great opportunity for us both – for me, it allows me the chance to demonstrate my proficiency in leveraging my skills to grow a product efficiently and effectively, while for you it grants you the benefit of a professional who can prioritize your technical guidance when necessary. Let me bring to life the practical aspects of software engineering best practices that this project offers!
$20 USD in 2 days
4.1
4.1

Hey , I just went through your job description and noticed you need someone skilled in SaaS, API Integration, Payment Processing and PHP. That’s right up my alley. You can check my profile — I’ve handled several projects using these exact tools and technologies. Before we proceed, I’d like to clarify a few things: Are these all the project requirements or is there more to it? Do you already have any work done, or will this start from scratch? What’s your preferred deadline for completion? Why Work With Me? Over 180 successful projects completed. Long-term track record of happy clients and repeat work. I prioritize quality, deadlines, and clear communication. Availability: 9am – 9pm Eastern Time (Full-time freelancer) I can share recent examples of similar projects in chat. Let’s connect and discuss your vision in detail. Kind Regards, Zain Arshad
$10 USD in 1 day
4.1
4.1

As an experienced PHP developer, I'm confident in my ability to complete and respect the existing language and architecture of your SaaS subscription module. Reusing code components that are already in place is essential to avoiding unnecessary duplication and optimizing the existing functionality. My thorough understanding and adherence to the project requirements will ensure that your codebase stays clean, organized, and easy-to-maintain. Moreover, my background in full-stack web development equips me with a comprehensive perspective on software engineering best practices, including SOLID and DRY principles. I understand the importance of programming against abstractions rather than concrete implementations to create modular solutions adaptable across various projects and payment gateways. Most importantly, I guarantee your subscription module will be built with a 'results-driven' approach that focuses on efficiency, scalability, and user-friendliness. My commitment to delivering high-quality code on schedule not only guarantees a completion of your SaaS module but also provides an avenue for your professional growth through practical application of software engineering best practices. In hiring me, you're assured of not just a technically competent individual but also someone dedicated to meeting and exceeding client expectations every step of the way. Thank you for considering my application and I look forward to aiding your project's success!
$30 USD in 1 day
3.6
3.6

Hi, I’m Bharti. I have strong PHP experience and can complete your SaaS subscription module while fully respecting the existing architecture and code standards. I’ll implement subscription registration, plan upgrades/downgrades, cancellations & reversals cleanly and efficiently. Ready to start right away. Thanks, Bharti
$20 USD in 7 days
4.0
4.0

Dear Sir/Madam, Hope you are doing well. I am delighted to present a bid proposal for your valued project. I am expert in developing websites in PHP, MySQL, Curl, Wordpress, Joomla, HTML,HTML5, CSS, Bootstrap 3 and 4, Jquery, javascript , AJAX , Payment Geteway , Facebook connect, google connect , CodeIgniter 4 and Laravel 11 framework. I have around 15+ years of experience in developing websites. I have also developed Joomla 3 components, plugins and modules. I provide you a fully secure and reliable web work. With fully customized Content Management System. I am also comfortable to design for different type of devices like Desktop, tablet, ipad and also mobile. I keep things very simple and without any complications. I eagerly anticipate your response and sincerely look forward to make this project a success in order to build a long-term mutually beneficial relationship. Thanks and Warm Regards, Tapas Bera (Full Stack PHP Developer)
$30 USD in 7 days
3.5
3.5

Hello, I’ve read your description carefully, and I understand that the priority is continuing and completing an existing PHP subscription module without breaking its architecture or rules. I’m comfortable working inside established codebases where respecting existing abstractions, patterns, and design decisions is non-negotiable. My approach would start with a thorough review of the current implementation to fully understand the domain model, services, helpers, and extension points already in place. From there, I would complete the missing functionality strictly by reusing existing components, programming against interfaces, and avoiding duplication or unnecessary new classes. I can implement: Subscription registration via payment-confirmation webhook with multiple billing periods Scheduled cancellation with the ability to revert before cycle end Immediate upgrades and scheduled downgrades Downgrade cancellation before application Gateway-agnostic, modular logic aligned with your abstraction layer I work exclusively in PHP, follow SOLID/DRY principles when applicable, and ensure services receive dependencies via arguments—not globals or hardcoded state. All changes will be clean, readable, and aligned with the current architecture. I’m happy to grow with the project, apply best practices as guided, and deliver maintainable, production-ready code. Ready to review the codebase and start. Thank you
$50 USD in 1 day
2.1
2.1

Hi, I’m excited about the opportunity to complete your SaaS subscription module while strictly adhering to your established PHP architecture and implementation rules. I specialize in building modular, gateway-agnostic systems, having managed complex technical infrastructures for HostOrient and developed data-integrated platforms like SPS Foods. I bridge the gap between functional requirements and high-quality, maintainable code. I will prioritize a deep audit of your existing codebase to reuse current components and ensure zero code duplication. I will implement the scheduled cancellation logic, immediate upgrades, and delayed downgrades by programming against your existing abstractions, ensuring the module remains decoupled from specific payment gateways. My approach follows SOLID and DRY principles to ensure the service and helper layers remain clean and testable, similar to the logic-heavy systems I developed for EGP BTC and the structural frameworks at Montreal Moving. As a results-driven professional, I am ready to follow your technical guidance and deliver a polished, production-ready module that respects your architectural integrity. I’ll ensure the webhook handling for confirmation and the reversal logic for scheduled changes are robust and fully tested. Let’s take your subscription module to the next level! Best regards, Md Mamun Hossain Full-Stack Developer | PHP Systems Architect
$20 USD in 7 days
1.7
1.7

Hi there, I’ve carefully reviewed your project and can continue developing your PHP SaaS subscription module while strictly following the existing architecture and coding rules. I’ll handle registration, cancellations, upgrades, and downgrades in a modular, reusable way, ensuring clean, maintainable code without duplicating existing components. With strong PHP experience and attention to detail, I can deliver a solution that meets all your functional requirements while preserving the current structure. Best regards, Salman
$100 USD in 1 day
1.4
1.4

With a solid background in software development, I am confident in my ability to meet the specific requirements of your project. Though primarily skilled in Django and FastAPI, my strong knowledge of PHP makes me equipped to complete the implementation of your SaaS Subscription Module with considerable ease. Additionally, my experience with PostgreSQL, MongoDB, and AWS EC2, aligns seamlessly with the requirement for architectural modularity and ease of gateway replacement—enabling me to contribute highly effective and scalable solutions to complex problems. As for follow-upments, I strive for best practices and adhere strictly to given rules. My understanding of SOLID and DRY design principles enables me to write code that is both efficient and easy to maintain—and I aim to bring this proficiency into completing your pre-existing module without duplication or compromise on the existing architecture. Your project offers an opportunity for growth and I am equally eager to put my skills into action.
$20 USD in 2 days
0.0
0.0

Hey , I just finished reading the job description and I see you are looking for someone experienced in PHP, Payment Processing, SaaS and API Integration. This is something I can do. Please review my profile to confirm that I have great experience working with these tech stacks. While I have few questions: 1. These are all the requirements? If not, Please share more detailed requirements. 2. Do you currently have anything done for the job or it has to be done from scratch? 3. What is the timeline to get this done? Why Choose Me? 1. I have done more than 250 major projects. 2. I have not received a single bad feedback since the last 5-6 years. 3. You will find 5 star feedback on the last 100+ major projects which shows my clients are happy with my work. Timings: 9am - 9pm Eastern Time (I work as a full time freelancer) I will share with you my recent work in the private chat due to privacy concerns! Please start the chat to discuss it further. Regards, Salik.
$10 USD in 2 days
0.0
0.0

After reviewing your project, I’ve already identified some opportunities to enhance the outcome. Since the subscription module is partially implemented in PHP, focusing on a clean, modular approach that respects your architecture and avoids code duplication is crucial. This sounds like something I’d genuinely enjoy working on, and I’d love to dive in. I bring solid hands on experience and have successfully completed similar projects off site. My skills include strong PHP expertise, adherence to best practices like SOLID principles, and building reusable, integrated solutions that work seamlessly without hardcoded dependencies. If this feels like the right fit, I’m ready to start and deliver exactly what you need quickly, professionally, and with no guesswork. Regards, Curtley
$18 USD in 14 days
0.0
0.0

Hey , I just finished reading the job description and I see you are looking for someone experienced in SaaS, Payment Processing, API Integration and PHP. This is something I can do. Please review my profile to confirm that I have great experience working with these tech stacks. While I have few questions: 1. These are all the requirements? If not, Please share more detailed requirements. 2. Do you currently have anything done for the job or it has to be done from scratch? 3. What is the timeline to get this done? Why Choose Me? Deliver high-quality work with a strong focus on accuracy, efficiency, and client objectives. Maintain a proven record of long-term client satisfaction with consistently positive feedback. Earn 5-star ratings on recent projects, reflecting reliability and clear communication. Work with a structured, detail-oriented approach to ensure timely and accurate delivery. Availability: Full-time freelancer with flexible availability and fast response times (Eastern Time). I will share with you my recent work in the private chat due to privacy concerns! Please start the chat to discuss it further. Regards, Hassan.
$10 USD in 6 days
0.0
0.0

Hello, I’ve read your description carefully and understand that this project is not about reinventing the solution, but about finishing it correctly within the existing PHP architecture and rules. I’m comfortable working in partially implemented systems where respecting established abstractions and design decisions is mandatory. My first step would be a thorough review of the current codebase to fully understand the domain model, existing services, helpers, and extension points. From there, I would complete the missing functionality strictly by reusing what already exists, avoiding duplicate logic or unnecessary new components. I can correctly implement: Subscription creation via payment-confirmation webhook with multiple billing periods Scheduled cancellation effective at cycle end, with reversible state before execution Immediate plan upgrades Scheduled downgrades applied only after the current higher-tier cycle ends Cancellation of pending downgrades before application The implementation will remain gateway-agnostic, modular, and aligned with programming against abstractions. All services will receive required data via arguments—no globals or hardcoded dependencies. Changes will be clean, minimal, and consistent with the current structure. I work exclusively in PHP, am comfortable applying SOLID/DRY when appropriate, and welcome technical guidance to align with your standards. I’m ready to review the codebase and proceed carefully and methodically. Thank you
$30 USD in 2 days
0.0
0.0

Hello, I’m a strong PHP developer experienced in working with existing, rule-driven codebases where architecture and conventions must be strictly respected. I can complete and extend your SaaS subscription module by: Carefully analyzing the current implementation before writing anything Reusing existing services, helpers, and abstractions (no duplication) Implementing subscription lifecycle logic (register, cancel, upgrade, downgrade) exactly as specified Ensuring scheduled actions (cancellation/downgrade) are reversible before execution Keeping the solution modular, gateway-agnostic, and reusable I’m comfortable programming against abstractions, passing dependencies via arguments, and maintaining clean, maintainable PHP code that aligns with SOLID/DRY principles. I value correctness and architecture over shortcuts and will strictly follow all implementation rules. Looking forward to collaborating. Narpat PHP Developer
$20 USD in 7 days
0.0
0.0

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