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I am reaching out regarding a freelance development opportunity for ZEDPERA ([login to view URL]), an AI-powered web platform designed to support students throughout the preparation of academic and university-level work. The platform is already under active development, and I am looking for an experienced freelance developer who can help with further development, technical improvements, integration work, testing, and production readiness. The current technology stack includes primarily: [login to view URL] / React TypeScript Node.js Supabase PostgreSQL Stripe Vercel AI/API integrations Authentication, user accounts, subscriptions, and usage limits The scope may include work on both frontend and backend components, including improving existing functionality, resolving technical issues, completing integrations, reviewing the current architecture, and implementing additional features. Particular attention will be required in areas such as: authentication and account management, subscription and payment workflows, Stripe Checkout and webhook processing, user plans, entitlements, and usage limits, AI-powered functionality, file and attachment processing, database integration, transactional email workflows, multilingual functionality, performance and reliability, responsive UI/UX, security and production deployment, testing of complete end-to-end user flows. I am looking for someone who is comfortable working with an existing production-oriented codebase, can understand the current architecture quickly, and is able to deliver clean, maintainable, well-documented code without introducing unnecessary changes to functionality that is already working correctly. Before starting development, I would expect an initial technical review of the existing project, followed by a clear proposal covering: your understanding of the required work, recommended technical approach, estimated workload, pricing or hourly rate, availability, expected delivery milestones, testing and handover process. Experience with [login to view URL], TypeScript, Supabase, Stripe, Vercel, PostgreSQL, and AI-based SaaS applications would be a strong advantage. Please also send me examples of relevant projects you have completed, particularly SaaS applications, subscription-based platforms, AI applications, or projects involving Stripe and Supabase. The intention is not only to complete individual tasks, but potentially to establish long-term cooperation for further development and maintenance of ZEDPERA if the initial collaboration is successful. Website: [login to view URL] I would be happy to provide the detailed scope, current project status, technical requirements, and access to the relevant development environment once we agree on the next steps. I look forward to hearing from you. Best regards,
Project ID: 40612812
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236 freelancers are bidding on average €6,664 EUR for this job

With over a decade of experience in full-stack architecture and high-scale systems, I understand the importance of advancing the ZEDPERA platform for supporting students in their academic endeavors. My background in handling projects with 1M+ users and securing high-scale FinTech systems directly applies to the complexities of enhancing the AI-powered web platform. Strategic Insight: A key strategy for scalability in this project would be optimizing authentication workflows and implementing robust AI/API integrations. I have successfully built and scaled high-traffic web platforms, like Telegram Mini Apps, serving millions of users, demonstrating my ability to handle such complexities effectively. I encourage you to reach out to discuss the roadmap for ZEDPERA's development further. Let's connect to delve into your project goals and how we can achieve them together for long-term success.
€8,000 EUR in 60 days
9.1
9.1

Hi — Elias here from Miami. I appreciate your outreach regarding the ZEDPERA platform development. It’s clear that the goal is to create a robust AI-driven solution that meets user needs effectively. The real challenge here typically revolves around scalability and maintainability. As user demand grows, ensuring the system can handle increased loads without compromising performance is essential. A common issue in platforms like this is managing integrations seamlessly with external services and ensuring the architecture supports future expansion. My approach would focus on building a modular structure, utilizing technologies like Node.js and PostgreSQL to ensure both stability and flexibility. This setup enables easy updates and enhances performance as more features are added. I’ve worked on several similar projects, where I implemented scalable solutions that allowed for quick iterations based on user feedback. A few questions to better understand the scope: Q1 – How do you envision user roles and permissions within the platform? Q2 – What specific integrations or external services are you considering? Q3 – Are there particular performance benchmarks or scaling expectations you have in mind? Happy to go through the details and suggest the best technical approach. Looking forward to hearing from you.
€8,000 EUR in 26 days
8.6
8.6

Hi, I reviewed the ZEDPERA platform request and understand you need further development and technical improvements across frontend and backend, with strong focus on authentication, subscriptions, and production readiness. I’ll work within the existing production-oriented codebase, handling Supabase and PostgreSQL database integration, PHP-based backend pieces, and JavaScript-driven frontend behavior, while supporting user accounts, usage limits, and secure workflows. I focus on clean, maintainable, well-documented changes, plus end-to-end testing for Stripe Checkout, webhook processing, and complete user flows. Let’s discuss here now.
€5,000 EUR in 30 days
8.5
8.5

You're trying to add AI into a ZEDPERA Platform Development where the real challenge is making the AI layer reliable and the prompts survive real-world use. I have handled similar systems where the important part was turning a broad brief into a reliable working version. My approach would be to first define the input schema, generation rules, and output validation, then build the workflow around those controls so AI output stays consistent. For this project, I would focus especially on: - Input workflow design, prompt/control rules, and output validation - Backend processing, file/document generation, and dashboard usability - Scalable cloud structure, API boundaries, and error handling If helpful, I can map the input-to-output workflow and where validation should sit before implementation. Best, Dr. Syafiq
€7,500 EUR in 21 days
7.6
7.6

In this vast digital landscape, finding the right developer--one who comprehends and brings all your project aspects together--is daunting. However, I am here to make it easy for you. With a diversified skill set that ranges from full-stack proficiency in React, TypeScript, Node.js to specialties like AI-based applications and Stripe/Supabase subscription workflows you mentioned using, I believe I am the ideal fit for your ZEDPERA platform development project. What sets me apart is not just the languages and frameworks I am adept at; it's my understanding of the industry as a whole. As a seasoned developer, I comprehend the importance of clean, maintainable code in an existing architecture without compromising on features that are already functioning optimally. My track record proves this as I always ensure all my work satisfies three key criteria: performance excellence, scalability and bug-free operation. Additionally, as a creative problem solver, I don't just see challenges; I see opportunities to enhance your platform. My end-to-end approach enables me to contribute not only to solving technical bugs but also suggesting improvements, reviewing architectures and integrating new features.
€5,000 EUR in 1 day
6.5
6.5

Hey, your focus on subscription and payment workflows with Stripe caught my eye. I can streamline those using Stripe's webhooks to ensure smooth processing. I've handled similar setups where integrating AI with subscription management was the tricky part. How's the current user plan setup are you using tiered pricing or a single plan structure right now?
€5,000 EUR in 45 days
6.0
6.0

The integration of Stripe Checkout and webhook processing appears central for ZEDPERA, especially with user plans and entitlements. A clear path would be refining these workflows to ensure smooth transactions and reliable usage tracking. Given the stack, a focus on Supabase and Vercel will support scalability and performance. How are you currently managing subscription lifecycle events, and are there specific pain points in the webhook handling you're looking to address?
€7,500 EUR in 45 days
6.0
6.0

Hello, Your AI powered SaaS platform is a great match for my experience. I have strong experience with web development, APIs, subscription platforms, payment workflows, and software that continues to perform well as demand grows. I can quickly understand your existing codebase, review the current architecture, and deliver exactly what you need while keeping the current functionality stable. I am comfortable working across frontend and backend, resolving issues, completing integrations, and preparing applications for production. I would prefer a quick call or meeting to understand your goals clearly and make sure I am aligned with your expectations from the start. I will share my portfolio in chat I look forward to hear from you. Thanks Best Regards, Mughira
€7,500 EUR in 7 days
5.7
5.7

Hello, Ricardo from Buenos Aires here. You named Stripe webhooks and user entitlements together as a priority area, that pairing is exactly where subscription platforms quietly break. Stripe can deliver the same webhook more than once, or out of order, and if the handler just applies each event blindly, a user can get double-credited on a renewal or downgraded because an older event arrived after a newer one already processed. I've built subscription and payment-integrated systems before, and the fix is making every webhook handler idempotent, checking the event ID against a processed log, and validating against current subscription state rather than trusting event order, so entitlements stay accurate no matter how Stripe delivers them. Given this is continuing an existing production codebase, I'd start with a real technical review, understanding the current architecture and where things already work, before touching anything, then move into the priority areas you listed: auth, payment workflows, AI functionality, and testing full user flows, without disrupting what's already solid. I can start the review immediately once I have access.
€6,700 EUR in 47 days
4.3
4.3

Hello, on a Supabase and Stripe SaaS the area that most often hides bugs is the gap between a Stripe subscription state and the entitlement your app actually enforces, so that is where I would look first. If plan access is read from a column updated only by the checkout success redirect, then a card that fails on renewal, a downgrade, or a cancellation from the Stripe portal never reaches your database, and users keep access they should have lost or lose access they paid for. The fix is driving entitlements from webhook events rather than the redirect, with the webhook verifying the signature and being idempotent, since Stripe retries and a non-idempotent handler double-applies. Second, with Supabase the thing worth auditing early is Row Level Security. It is easy to build working features while RLS is permissive, then discover the API lets one user read another's data because policies were never tightened. On a student platform holding personal work, that is the risk I would want to rule out before adding features. I would start with the technical review you asked for rather than any feature work, mapping the auth flow, the Stripe webhook coverage, and the RLS policies, then give you findings ordered by severity before touching anything. A few questions. Is entitlement currently webhook-driven or redirect-driven? Are RLS policies in place across all tables? Which AI provider powers the core functionality? And is there a staging environment separate from production? Have a nice day
€7,000 EUR in 45 days
2.0
2.0

Kuková, Slovakia
Member since Jul 7, 2013
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