Experienced Full-Stack Developer Needed to Finalize and Stabilize SaaS Product – Neirom

@ukroficer

Hello, NEIROM — I would stabilize the existing React/TypeScript SaaS in place, not rebuild it, because the risk here is in production flows across Supabase, Shopify OAuth/webhooks, Etsy API, and Paddle billing. Based on your brief, the likely remaining work is failed edge cases, weak DB/auth rules, broken sync/jobs, and review blockers for Shopify public distribution and Etsy access. - Audit codebase, auth, DB policies, webhooks, jobs, and error handling. - Fix launch-blocking bugs in signup, login, billing, and AI analysis flows. - Harden Shopify sync, scopes, uninstall flow, and webhook reliability. - Verify Etsy API compliance, mobile/desktop UX, and production stability. I can start with the audit and turn it into a fix list with priorities. Which area is currently the main blocker: Shopify review, Etsy compliance, billing, or core user flows? Roman

@shrec

NEIROM I’d approach Neirom as a stabilization and production-readiness job, not a rebuild. I’d first audit the existing React/TypeScript, Supabase/PostgreSQL, authentication, permissions, AI, Paddle, Resend, Shopify, and Etsy flows to identify what is actually incomplete or unreliable. Then I’d fix the highest-impact issues, verify webhooks and scheduled jobs, test critical flows end-to-end, and address security, performance, and mobile/desktop problems without unnecessary changes. Based on the details provided, I’d expect the remaining work to be determined by the audit, so I wouldn’t give you an artificial fixed price or timeline before seeing the codebase. After reviewing it, I can provide a clear scope, realistic schedule, and fixed launch-ready price. I’m comfortable working with OAuth/API integrations, PostgreSQL, SaaS debugging, and production stabilization. Best, Ivane

@usmanbashir12100

NEIROM Hi, I’d stabilize Neirom by auditing the existing React/TypeScript, Supabase, OAuth, billing, AI, and webhook flows first, then fixing only launch-blocking issues rather than rebuilding working functionality. Key remaining areas appear to be Shopify/Etsy production readiness, security/RLS, Paddle billing, synchronization reliability, scheduled jobs, and end-to-end testing. After code access, I can confirm a realistic fixed price and timeline based on actual outstanding work. A few questions: 1. Are Shopify OAuth, product sync, and webhook flows already working in development, and which production scenarios are currently failing? 2. Has Supabase RLS, service-role usage, webhook authentication, and tenant-level data isolation already been security-reviewed? 3. For Etsy, have you already applied for Commercial Access, and are there any current API review issues, permission limitations, or compliance feedback to address?

@bcosley

Hi, NEIROM: Neirom is live and you want to stabilize what’s already there, not rewrite it. I’ve done similar stabilization work on React/TypeScript stacks with Supabase and OAuth/API integrations, and I understand the pressure to improve reliability without user-impactful changes. I’ll focus on a lean audit, bug triage, and performance improvements while preserving existing UX. I’ve led end-to-end stabilization for similar SaaS apps, delivering production patches without disrupting existing users. I’d start by validating the current flows, reproducing signup/login, billing, and webhook paths in a staging environment, then isolate unstable parts and patch against real usage. Next, I’d tighten monitoring, run end-to-end tests, and confirm external API compliance (Shopify, Etsy) before a staged rollout. One realistic risk is breaking existing OAuth flows or webhook handling during a partial fix. What are the non-negotiable user flows that must stay unchanged during fixes? Is there a specific production window or downtime tolerance for the Shopify/Etsy integration rollout? If we're aligned, I can outline the implementation phases before kickoff. Best regards, Brandon

@Microlent

Hello, I am Dr. Rajesh Rolen, PhD in Computer Science & Engineering, with experience of over 20+ years in API Integration, Software Testing, PostgreSQL, Full Stack Development 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

@ozbas

As an experienced full-stack developer, I fully understand what you're looking for in a candidate to finesse your SaaS product, Neirom. Being adept with React and TypeScript, I'm confident in my ability to scrutinize your current codebase, identify any bug fixing requirements or performance enhancement needs, and overall stabilize the platform thoroughly. With over a decade of experience under my belt, I can assure you that I always operate on the principle of "fix only what is necessary". No unnecessary redesigns or new features to ensure your project remains within budget. Having worked extensively with Shopify apps and OAuth/API integrations for the past half-decade, I can assure you that I'm well-equipped to finalize and verify the Shopify integration for production use with precision. In addition to my expertise with Supabase, I have a solid understanding of PostgreSQL which will come in handy while reviewing authentication, database permissions, and security. In terms of time frame and cost estimation, after carefully reviewing your project structure, it would take me approximately [timetable] to bring Neirom to a launch-ready state in compliance with Etsy's current API requirements. My fixed price for diligently completing this task based on its current status would be [rate], providing exceptional value for money. While my practices might be thrifty, they are never compromised in quality.

@installerpoint

NEIROM Hello, I would approach stabilization by first auditing the live React/TypeScript, Supabase/PostgreSQL, authentication, permissions, billing, AI, Shopify, Etsy, webhook, and scheduled-job flows, then prioritizing production-impacting defects before performance and UX refinements. Based on the described scope, I would expect a structured audit and stabilization phase, followed by end-to-end testing and launch-readiness verification rather than an unnecessary rebuild. I have relevant experience working with existing full-stack applications, Supabase, OAuth/API integrations, webhooks, PostgreSQL security, and production troubleshooting. I would specifically validate Shopify product sync and review Etsy API compliance requirements, while documenting any remaining work and risks. I would also recommend adding focused monitoring and automated regression checks for billing, synchronization, and authentication. Shopify App Review and Etsy approval outcomes depend on the app’s current implementation and submission status, so I would verify readiness against their latest requirements before submission. Check out my portfolio here:- https://www.freelancer.com/u/installerpoint Best Regards, Muhammad Adeel

@ykarora26

With hands-on experience in full-stack development and expertise in React/TypeScript, I understand your need for stabilizing Neirom to meet professional standards. My similar past projects involved codebase review, bug fixing, and enhancing performance. How critical is seamless Shopify integration for your current user base’s needs and growth vision? Regards, Yogesh Kumar

@denisSolution

Hi, I'm Denis, a full-stack developer specializing in stabilizing and hardening existing SaaS products. I understand exactly what you need. I'd approach Neirom methodically: audit the codebase, fix broken flows, ensure Shopify and Etsy integrations are production-ready, and verify authentication, permissions, and webhooks are solid. I'd test the full user journey from signup through billing and AI analysis, verify webhook reliability, check Supabase database constraints and row-level security, and ensure responsive mobile and desktop experiences. I've built OAuth flows for both Shopify and Etsy, handled product synchronization with webhooks, and managed API rate limits and compliance requirements. While I haven't personally guided apps through Shopify's review or Etsy's Commercial Access approval, I'm familiar with both platforms' documentation and requirements. Based on your scope, I estimate 3-4 weeks of focused work to reach launch-ready state, with a fixed price of $8,000-$10,000 once I've reviewed the codebase and identified specific gaps. I can start immediately. Let's discuss the details. Thanks, Denis.

@toriquldev123

NEIROM I’m Md Toriqul Islam, and I’m excited to partner with you. I’m an experienced full-stack developer with 10+ years of experience working with SaaS platforms, APIs, databases, integrations, and production systems. I understand you need to stabilize the existing Neirom codebase—not rebuild it—by auditing React/TypeScript and Supabase, fixing bugs, improving security/performance, testing billing and AI flows, and completing Shopify/Etsy integrations. I am skilled in React, TypeScript, PostgreSQL, REST APIs, OAuth, webhooks, GitHub, and third-party integrations. I’d begin with an audit, prioritize blockers, fix and test them systematically, then prepare the production release. Looking forward to hearing from you. Best regards, Md Toriqul Islam

@a4logic

Hello, NEIROM, and thank you so much for considering my expertise to take on your project. As an accomplished full-stack developer with over 15 years of experience, I have an extensive skill set that aligns perfectly with your requirements. Not only am I proficient in React, TypeScript and a host of other languages, but I've also worked extensively in similar environments including Shopify, Supabase, OAuth/API integrations, and ERP/CRM systems. To stabilize an existing SaaS system like Neirom, I would begin with a comprehensive audit of the codebase - identifying bugs and broken flows, assessing security protocols, verifying third-party integrations, checking up time and performance stats, as well as any other technical aspects up for review. Once done, I'd prioritize areas that need immediate attention and ensure clear communication throughout the process about what was done, how it resolved any issues and if there are updates to existing systems. Given the information provided about Neirom's current state and your requirements for stabilization and a production-ready overhaul, I estimate that it would take approximately X weeks to finalize the product professionally at a fixed price of $X. My previous experience with launching SaaS platforms in combination with my knack for adaptable problem-solving makes me a suitable candidate for this task. Though no two projects are ever alike, I have previously helped apps through review pro Thanks!

@KarthikTechCon

NEIROM Hi, I'm Karthik, a full-stack developer with 15+ years of experience in delivering robust SaaS solutions. I can help finalize and stabilize Neirom efficiently without unnecessary redesigns. Proposed Approach: 1. Conduct a full technical audit of the existing codebase to identify critical issues. 2. Address bugs and broken flows, focusing on performance and reliability improvements. 3. Review and enhance authentication, database permissions, and security measures. 4. Ensure compliance with Shopify and Etsy API requirements, preparing for app reviews. 5. Conduct thorough testing on mobile and desktop UX. Completion Timeline: I estimate around 4-6 weeks to bring Neirom to a launch-ready state, considering the existing functionalities. Fixed Price: After reviewing the code structure, I propose a budget of £200 for stabilization. Relevant Experience: I have successfully integrated Shopify apps and handled OAuth/API integrations. Previously, I assisted an app through Shopify App Review and ensured Etsy API compliance. Looking forward to collaborating on bringing Neirom to its full potential!

@intelliresponse

Hello, I have experience working with existing SaaS applications and improving production systems without unnecessary rebuilds. I can review the current React/TypeScript, Supabase, API integrations, and third-party services to identify remaining issues and stabilize the platform. My approach would start with a complete technical audit of the codebase, database structure, authentication, security rules, integrations, and user flows. I would then fix critical bugs, improve performance, verify billing and AI workflows, and ensure Shopify, Etsy, webhooks, and background processes are reliable. I have experience with modern full-stack applications using React, TypeScript, PostgreSQL, Supabase, OAuth integrations, payment systems, and external APIs. I understand the importance of keeping the existing architecture and making only necessary improvements to reach a professional production-ready state. After reviewing the current repository and application status, I can provide a realistic timeline and fixed-price estimate. My goal would be to deliver a stable, secure, and maintainable SaaS product ready for users, marketplace reviews, and future growth.

@longngoc2307

==== Hi - Truong here ==== NEIROM "SAAS PRODUCT STABILIZATION" — you need an existing app fixed and ready for launch without rebuilding. I can audit the current React/TypeScript, Supabase, PostgreSQL, OAuth, billing, and API flows, then fix only the areas blocking production. I would start by mapping signup, authentication, AI analysis, payments, Shopify sync, and database permissions to find the real issues before changing code. For a SaaS already built, the important part is protecting working features while improving reliability. I would review webhooks, security rules, scheduled tasks, and third-party integrations so the app is stable for users and future updates. Which areas are currently causing the biggest problems: bugs in user flows, Shopify/Etsy integrations, payments, performance, or security review findings? Looking forward to work with you

@mickeysz

NEIROM. How I stabilize a live, Lovable-built SaaS: audit first, map what already works, and never refactor for taste. I characterise each integration as working, broken, or risky before touching code, fix with the smallest change, and prove it against the live flows. That matches your "fix only what is necessary." From the stack, here is what I would expect to find and where I would start. First, security, and it is the biggest risk here. A vibecoded Supabase app that stores users' Shopify and Etsy OAuth tokens must have row-level security on every table, or one user could read another user's store tokens, which is catastrophic. So the audit begins with RLS coverage and whether those tokens are protected and never readable cross-tenant. Second, billing. Paddle subscription state must be driven by verified, idempotent webhooks, not the browser return, and the plan gate enforced server-side, not just hidden in the React UI, or users reach the AI features without paying. Third, app-review readiness. Shopify review has hard requirements vibecoded apps usually miss: the mandatory GDPR compliance webhooks, HMAC-verified webhooks, and minimal OAuth scopes. Etsy Commercial Access checks rate-limit compliance and approved use. I audit against those checklists, not cosmetics. Can I get read access to the repo and Supabase schema to start the audit?

@p4logics

NEIROM. I understand you need an expert to audit, stabilize, and finalize your existing SaaS product without rebuilding it from scratch. As a developer, I will fix the existing React and Supabase codebase, secure the database, and complete the Shopify OAuth and Etsy API setups so they successfully pass their official app reviews. To finalize the project, I will test the billing, webhooks, and mobile UX end-to-end, fixing only the necessary bugs to deliver a fast, production-ready app efficiently. Please ping me we can discuss in detail and can start immediately.

@AndrewJSMAN

NEIROM. I've built and stabilized multiple SaaS products with similar stacks, so this is right in my wheelhouse. I'll audit the codebase, fix bugs, optimize performance, and secure auth while testing all critical flows—Shopify/Etsy integrations, billing, and webhooks. I've helped apps through Shopify/Etsy reviews before, and I'll ensure compliance. I'll document fixes and configurations but focus on what's broken, not overhaul. I can start immediately. Thanks, Andrii.

@crtvecode

NEIROM When a SaaS product is largely built but still requires stabilization, the underlying issue often lies in the integration and performance of its existing components. My goal is to make sure that the current functionality is optimized and reliable without a complete rebuild. To address your needs effectively, I propose the following phases: Technical audit: I will conduct a thorough review of the existing codebase, identifying areas for improvement and potential bugs. Bug fixes and performance tuning: I'll address broken flows, enhance speed, and improve code quality, making sure the application runs smoothly. Authentication and security review: I'll evaluate the authentication mechanisms, database permissions, and overall security to safeguard user data. Integration compliance checks: I'll review the Shopify and Etsy integrations to make sure they meet the current API requirements and prepare the app for necessary reviews. End-to-end testing and UX validation: I will perform full testing of all functionalities, including mobile and desktop UX, to confirm everything works as intended. I understand the importance of maintaining your existing site and content without disruption. My approach will not affect your live environment during this process. Regarding your questions, I believe the technical audit will reveal additional areas for improvement, and I estimate that finalizing the product will take approximately 4-6 weeks, depending on the findings. My fixed

@Tanmoy236

NEIROM Hello! I'm a full-stack developer experienced in stabilizing live SaaS products without unnecessary rebuilds. I work with React/TypeScript, Supabase, and API integrations including Shopify and Etsy. Here's how I can help: - Audit the existing codebase, preserving working functionality - Fix bugs and broken flows across auth, database permissions, and billing - Improve speed, stability, responsiveness, and code quality - Test signup/login, plans, AI analysis, and billing end-to-end - Finish and test the Shopify integration for production, including OAuth, sync, and webhooks - Review Etsy API implementation for compliance and support Commercial Access prep - Verify webhooks, monitoring, and scheduled jobs My approach: review structure first, identify what's incomplete or fragile, then fix only what's necessary. I have experience with Shopify app review and Supabase OAuth integrations. Timeline and fixed price available after reviewing the codebase. Let's get Neirom launch-ready efficiently.