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# Full-Stack Developer Needed for Existing AI SaaS — Inspection, Deployment & Improvements I recently acquired an existing AI SaaS application called **Proxelion** and I'm looking for a reliable full-stack developer who can help me understand, deploy and improve the product. I am a **non-technical founder**, so I need someone who can explain technical issues clearly and work with me long-term. Think of the first task like a **mechanic inspecting a car before purchase**. I don't want someone to immediately rebuild the application. I want someone to first inspect what is already there, test the important functionality, identify problems and tell me what actually needs to be fixed. ## Existing Technology The application is built with technologies including: * [login to view URL] * React * TypeScript * Supabase/PostgreSQL * Vercel * AI APIs / Claude / OpenRouter * SMTP * IMAP * [login to view URL] * Polar * Google OAuth * Chrome Extension / Manifest V3 The application is already deployed and has existing functionality. ## PHASE 1 — TECHNICAL INSPECTION I want you to review the existing application and codebase. Please check: * Overall architecture * Frontend * Backend/API * Database * Authentication * User data isolation * AI integrations * SMTP * IMAP reply detection * Automated follow-ups * Stop-follow-up-on-reply functionality * Gmail/OAuth implementation * Microsoft 365 compatibility * Background jobs/cron * Billing * Chrome extension * API integrations * Security basics * Deployment configuration * Third-party dependencies Please actually test the major workflows rather than only looking at the source code. For example: **Create user → find company → find contact → generate email → send → receive reply → detect reply → classify reply → stop follow-up** I want to know whether this actually works end-to-end. ### Chrome Extension The existing extension includes: * Gmail sidebar * AI email generation * Three email variations * Follow-up generation * Pitch templates * Usage/credit information * Insert generated email into Gmail * Proxelion authentication It is Manifest V3 and currently unpublished. Please inspect and test it as well. ## DELIVERABLE I want a short report in plain English explaining: ### Critical Things that should be fixed. ### Important Things that should be addressed soon. ### Improvements Things that can be improved later. ### Working Things that are already functioning properly. For each major issue, please give me: * What is wrong * Why it matters * How you would fix it * Estimated hours I don't need a huge academic report. I need a practical founder-friendly assessment. --- # PHASE 2 — DEPLOYMENT After the inspection, I want help moving the application into **my own accounts/infrastructure**. This may include: * GitHub * Vercel * Supabase * Google Cloud * AI/API accounts * Domain * Email * Other required services The goal is that after handover, I control the product and don't depend on the previous owner. You will help configure the application and verify that it works after deployment. # IMPORTANT **The first milestone is ONLY the technical inspection.** I do not want the developer to make changes to the existing production application during the inspection. Initial access will be provided appropriately for review/testing. If the developer is a good fit, there will be additional paid work for deployment, fixes and new features. I am looking for a long-term developer rather than someone who wants to rewrite everything. --- # IDEAL DEVELOPER Experience with several of the following: * [login to view URL] * React * TypeScript * Node.js * Supabase * PostgreSQL * SaaS applications * REST APIs * Vercel * AI APIs * SMTP * IMAP * OAuth * Chrome Extensions * Google APIs * Microsoft 365 * Production deployment You don't need to be an AI researcher. Strong full-stack SaaS experience is more important. --- # PLEASE ANSWER 1. Have you worked on an existing SaaS application that you took over from another developer? 2. How would you inspect an existing SaaS before taking ownership? 3. Have you worked with [login to view URL] + Supabase? 4. Have you worked with Gmail/OAuth? 5. Have you worked with SMTP/IMAP? 6. Have you built Chrome extensions? 7. Have you deployed applications to Vercel/Supabase? 8. Can you explain technical issues to a non-technical founder? 9. What would you charge for the initial technical inspection? 10. What is your hourly rate for future development? 11. Please provide examples of relevant projects. ## Budget Please provide your fixed price and estimated hours for the inspection. Quality and communication are more important than simply being the lowest bidder.
Project ID: 40714908
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Taking over an existing SaaS should start with evidence, not a rewrite. I’d treat Proxelion like a production system being handed to a new engineer: inspect it, test the critical workflows, document what actually works, and only then recommend changes. I have hands-on experience with [login to view URL], React, TypeScript, Node.js, Supabase/PostgreSQL, REST APIs, authentication, email handling, and Vercel deployments. I’ve worked on existing SaaS products including QResolve, handling its Supabase database, APIs, email workflows, deployment, and production troubleshooting. For Phase 1, I’ll review the architecture, database, authentication/data isolation, AI integrations, billing, background jobs, SMTP/IMAP, OAuth, deployment, APIs, and Chrome extension. I’ll also test the critical workflow end-to-end rather than relying only on source-code review. You’ll receive a concise Critical / Important / Improvements / Working report with the issue, impact, recommended fix, and estimated hours. I will not modify production during the inspection. **Inspection:** 6–8 hours at **$8/hr ($48–$64)**. **Future development:** **$8/hr**. Relevant work: [login to view URL] [login to view URL] I’m comfortable explaining technical findings in plain English and taking ownership incrementally without unnecessary rewrites.
₹6,500 INR in 3 days
3.3
3.3
81 freelancers are bidding on average ₹21,911 INR for this job

Hi, auditing before touching anything is the right call treat it like a pre-purchase inspection, not an assumed rebuild. Quick answers: I regularly inherit undocumented production codebases and reconstruct architecture/logic before changing anything same core skill. React/TypeScript are strong for me (5-6 yrs); Supabase specifically I haven't used, though its Postgres foundation (RLS, schema, auth) maps to my SQL Server depth. I've implemented Google OAuth before. SMTP/IMAP: some exposure, not deep IMAP reply-detection experience. Chrome extensions (Manifest V3): no hands-on experience flagging that honestly rather than learning on your critical inspection. Vercel/Supabase deployment: not yet, Azure is my primary cloud. I regularly translate technical risk into plain business terms for non-technical founders. Given the gaps in Supabase/IMAP/Chrome extensions, I could cover architecture, auth, data isolation, billing, and deployment readiness solidly, with an honest "needs specialist" flag on the rest. Inspection: $250 fixed, ~15-18 hrs. Future hourly: $18. Happy to discuss if this partial-scope approach works, or if a specialist suits better. Akshay B
₹2,500 INR in 7 days
3.5
3.5

Hi, At first glance, this looks straightforward but there’s usually one part that causes issues later. Happy to share a quick plan if you're open to it. Regards, Rajesh
₹1,500 INR in 7 days
2.9
2.9

Hi The biggest risk with taking over an existing SaaS is that the code might look clean but the background jobs are actually failing silently. I would start by running the cron jobs manually to see if the automated follow-ups are actually firing, then I would test the Gmail OAuth flow to ensure the token refresh works without breaking. I have worked on similar handovers where the previous developer left the database migrations in a state that required a full reset, so I would check the Supabase schema history to make sure the data structure is sound before I touch anything. A common mistake is assuming the frontend is the only thing that needs testing. I would also inspect the Chrome extension's background script to verify it can handle the IMAP polling without crashing the browser tab. I am ready to start immediately.
₹10,000 INR in 5 days
2.4
2.4

Hello I am experienced full stack developer. I have done many project like this. I read your requirements and I can easily do this project. I will share you work report on daily bases. This is actually something I do regularly and I think I could be a good fit. I will provide you 1 month free support on existing feature. With years of experience in the relevant field, I will ensure that the work is complete efficiently, on time and with high quality results. I would love the opportunity to further discuss your goals. Please feel free to connect. Thank you
₹7,000 INR in 7 days
0.0
0.0

I'm Senior a Full-Stack Developer. I can help you For an existing SaaS, the main issue is usually hidden integration failures, incorrect data flow or dependency/configuration problems which may not be visible from code review only. I will test the real workflows step by step, check logs/API responses/database flow and document the actual root cause without changing production. I have 4 years experience and worked on more than 60 websites and applications. Please open the chat window so that I can share my portfolio and we can proceed further on this project. In addition to your project needs, I'll provide you with clean source code, free bug patches, and maintenance. I am awaiting your positive response. Regards Ritesh N
₹1,500 INR in 7 days
0.0
0.0

I can help you understand the current Proxelion application before taking ownership of it. The main focus will be identifying what is already working, what is broken, what is risky, and what actually needs development. I will not suggest rebuilding the application just because the code is not written by me. I will work with the existing architecture wherever it is practical and recommend changes only when they are required. I have 4 years of experience with Laravel, Node.js, REST APIs, MySQL, PostgreSQL, AWS, JavaScript, authentication, third-party integrations, and SaaS development. Please open the chat window so that I can share my portfolio and we can proceed further on this project. In addition to your project needs, I'll provide you with clean source code, free bug patches, and maintenance. I am awaiting your positive response. Regards Shikha
₹1,500 INR in 7 days
0.0
0.0

Hi, an inspection of Proxelion that tells you what actually runs and what only looks like it does. IMAP reply detection is where these usually rot, since a missed reply means follow ups keep sending. How we would do it: a throwaway tenant, then your whole chain run for real, company to contact to draft to send to reply to stop. We read code only where the run disagrees with the docs: RLS on Supabase, Vercel cron, OAuth scopes, Polar webhooks. The extension gets loaded unpacked and tested in Gmail. Nothing gets written to production. Do you have owner access on Vercel and Supabase yet? We run production AI SaaS of our own, so these failure modes are familiar. Regards, Digitalizers
₹5,250 INR in 7 days
0.0
0.0

Hello, I am Full Stack Developer with 15 years of working experience and I can help you understand as well as deploy it and also make changes in next phase as per your requirements. I am an interested in working on your project. Looking forward to hear from you.
₹12,500 INR in 5 days
0.0
0.0

Hello, I’m interested in the Proxelion technical inspection project. I have experience with React.js, JavaScript, Node.js, SQL, and MERN-stack web development, and I’m comfortable reviewing existing applications, understanding codebases, and troubleshooting workflows. For Phase 1, I will first inspect the architecture, frontend, backend/API, database, authentication, integrations, AI workflows, email functionality, background jobs, billing, deployment configuration, security basics, and Chrome extension. I will test the important workflows end-to-end without making changes to production. I will provide a clear founder-friendly report divided into Critical, Important, Improvements, and Working, with the issue, impact, suggested fix, and estimated hours for each major issue. I have worked with React-based applications and databases. For specific technologies such as IMAP, Manifest V3, and certain integrations, I will carefully review and test the existing implementation rather than make assumptions. I can communicate technical issues in simple language and focus on practical solutions rather than unnecessary rewrites. **Phase 1 Fixed Price:** ₹7,000 **Estimated Time:** 5–7 days **Estimated Hours:** 15–20 hours I’m interested in continuing with deployment, fixes, and future development if the inspection is a good fit. Thank you.
₹7,000 INR in 7 days
0.0
0.0

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