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I built a SaaS platform using an AI coding tool, and the main system is already working. This is not a project from scratch. I need an experienced backend developer to review the current setup, find the issues, and properly fix the billing flow. The backend side of the system uses Python and Go, so I am looking for someone comfortable working with existing backend logic, payment flows, and debugging integration issues. I need help with fixing and improving: Payment integration Subscription flow Free trial setup Trial-to-paid conversion Payment status handling Webhook / event handling if needed Basic testing to make sure the full billing flow works correctly The goal is to make the payment system stable, smooth, and reliable for users. What I need from you: Strong backend development experience with Python and Go Strong experience with SaaS billing systems Experience with Stripe, PayPal, or similar payment providers Experience with subscriptions, recurring billing, and free trial logic Ability to review an existing codebase, quickly understand the current setup, find the problems, and fix them properly Good debugging and troubleshooting skills for an already-built system Please apply if: You have worked on similar SaaS payment or subscription systems before You are comfortable fixing and improving an existing backend, not building from scratch You can clearly explain what is wrong and how you will fix it When applying, please share: Your related experience Which payment platforms you have worked with Similar SaaS subscription or billing projects you have handled Important: Please include "SaaS" at the beginning of your proposal. If you do not mention it, your proposal will be ignored.
Project ID: 40354213
147 proposals
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Active 14 days ago
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SaaS Hi, Is the first step checking why the current billing state breaks between trial, subscription, and payment events, so the full flow becomes stable without rebuilding the backend? Recently, I worked on SaaS billing systems where the main job was fixing existing backend logic for subscriptions, trial rules, webhook events, and payment status sync. I used Python and API/payment debugging to trace broken billing flows, correct event handling, and make trial-to-paid conversion work reliablly. For this project, I will first review the current Python and Go billing flow, find the broken logic in payments, subscriptions, trials, and webhooks, then fix and test the full flow properly. Just wondering, which provider are you using now - Stripe, PayPal, or another one? HOpe to discuss more on chat Best Artem
$40 USD in 7 days
1.3
1.3
147 freelancers are bidding on average $178 USD for this job

SaaS, I understand you need an experienced backend developer to fix payment integration, subscription flow, and trial setup for your existing SaaS platform built using Python and Go. With over 15 years of experience, I have worked extensively on SaaS billing systems and handled projects similar to yours. My expertise includes working with payment providers like Stripe and PayPal, ensuring smooth subscription and billing logic, and debugging existing systems effectively. I am confident in my ability to review your codebase, identify issues, and provide reliable solutions. Let's discuss the project details further to ensure a successful outcome. Please go through my profile to see my work history and let's connect to get started.
$123 USD in 6 days
8.7
8.7

SaaS Interesting project, I will review your Python and Go backend, diagnose the billing issues, and fix the payment integration, subscription flow, trial setup, and trial-to-paid conversion. I will also ensure webhook handling is solid so payment status updates never get missed. One thing I will check early is whether your trial expiration logic runs on a cron job or relies solely on Stripe webhooks, as mixing both without proper idempotency often causes duplicate charges. Questions: 1) Are you using Stripe, PayPal, or another provider? 2) Is the backend deployed on AWS, GCP, or another platform? Looking forward to your response. Best regards, Kamran
$90 USD in 5 days
8.4
8.4

"SaaS" Hi, I can dive into the existing Python and Go code to spot the underlying problems. With over 5 years of backend development experience, I’ve successfully worked on SaaS projects, handling payment systems like Stripe and PayPal. I excel in subscription flows, trial setups, and debugging payment integration issues. My focus is on making payment systems robust and user-friendly. I’d love to discuss this further and ensure your billing flow is stable and reliable. Let’s connect! Best Regards, Priyanka
$140 USD in 2 days
8.4
8.4

SaaS Hello, I’ve reviewed your SaaS billing needs and I’m confident I can stabilize and streamline the backend payment flow you already have in Python and Go. I’ve led SaaS billing projects with Stripe, PayPal, and similar providers, building reliable subscription lifecycles, free trial logic, trial-to-paid conversion, and robust webhook handling. I will audit your current setup, pinpoint the bottlenecks in payments, subscriptions, and trial state management, and implement clean, testable fixes for the full billing flow. Expect clearer state transitions, robust error handling, and thorough end-to-end testing so users never lose access or see unexpected charges. I’ve shared an initial estimate based on your description, and once we go over a few technical or functional details, I’ll confirm the exact cost and delivery schedule. Next steps: quick technical review call to map current flows, potential edge cases, and a phased fix plan with milestones. What is the most problematic edge case you’ve seen in your current billing flow (e.g., failed retries, webhook gaps, or trial-to-paid race conditions) and how do you prefer we verify it end-to-end? Best regards, Asad
$75 USD in 3 days
8.2
8.2

SaaS ★★★★★★ START NOW ★★★★★★ Message me so we talk in detail.. Yes, I can Fix SaaS Payment Integration, Subscription, and Trial Setup perfectly !! I placed a bid after checking your requirements. If you want you can ask me any questions regarding your requirement. I'm interested in working on your project. And don't worry about work. First, check my work if you are happy Then pay me. Please let me know if you require any detailed information. Waiting for your reply. I hope you respond to me. Thanks Sunil
$140 USD in 2 days
7.4
7.4

SaaS Hi! I can help you with fixing the billing flow on your platform. I've worked with Stripe extensively on subscription setups, handling trial periods, webhook events, and the tricky trial-to-paid conversion logic. Debugging an AI-generated codebase is something I've done before too, it usually comes down to tracing where the payment status and webhook responses aren't being handled correctly. I'm Edward, 10+ years of backend experience with Python and payment integrations. I'd start by reviewing your current flow end to end, pinpoint exactly where things break, and fix it properly. Happy to chat through what you're seeing.
$90 USD in 7 days
7.0
7.0

Saas Hi, I have good working experience with Python PostgreSQL Payment System Backend development Automation Message me here for further discussion. Looking forward to an early and positive response . Regards, Shalu
$159 USD in 7 days
6.9
6.9

Greetings, SaaS projects like yours can be tricky, especially when it comes to payment integrations. I understand you need a backend developer to dive into your existing setup and troubleshoot the payment flow, subscription management, and trial conversions. My approach would involve reviewing your current codebase to identify issues and ensure everything from the payment integration to webhook handling is working seamlessly. I have solid experience with Python and Go, along with a strong background in SaaS billing systems, specifically with payment platforms like Stripe. I’ve tackled similar challenges before, ensuring that users have a smooth and reliable experience when managing their subscriptions and payments. I’m confident I can pinpoint the problems and implement effective solutions that enhance the stability of your billing system. Best regards, Saba Ehsan
$80 USD in 2 days
6.9
6.9

SaaS I'm Iosif Peterfi, 15+ years helping teams stabilize live backends and payment flows with a calm, outcomes-driven approach. This is my speciality: turning complex SaaS billing lifecycles-subscriptions, free trials, payments, and webhook handling-into reliable, measurable processes on Python and Go backends. You need an experienced backend reviewer to map the current setup, identify gaps in billing, and fix the flow, including payment integration, subscription logic, free trial setup, trial-to-paid conversion, payment status handling, and basic testing. My approach delivers a clear audit, fixes that restore reliability, and a lightweight testing plan to protect revenue. You gain reduced risk, smoother user experiences, and predictable revenue signals for decision-making. Recently I helped a publishing SaaS stabilize their subscription platform. After the fixes, failed payments dropped by 40% and trial-to-paid conversions rose by 25% within two weeks. Let's chat - I can walk you through my approach in 15 minutes.
$1,200 USD in 5 days
6.7
6.7

Hi, I understand your SaaS platform is already built and the main challenge is stabilizing the billing flow—especially subscriptions, trial handling, and payment/webhook reliability. I’ve worked on similar systems with Stripe and PayPal where I debugged broken subscription lifecycles, fixed trial-to-paid transitions, and ensured accurate webhook/event handling for real-time status updates. I’m comfortable diving into existing Python/Go codebases, identifying root issues quickly, and implementing clean, reliable fixes with proper testing. I’ll also clearly explain what’s wrong and how each fix improves the system’s stability. Looking forward for your positive response in the chatbox. Best Regards, Arbaz N
$150 USD in 7 days
6.5
6.5

SaaS Hello There!!! ★★★★ ( Fixing and optimizing your SaaS payment, subscription, and trial backend flow ) ★★★★ I understand you need an experienced backend developer to review and fix your existing Python/Go SaaS platform, ensuring payment integration, subscription management, and trial-to-paid conversions work smoothly and reliably. ⚜ Payment gateway integration (Stripe, PayPal) ⚜ Subscription flow setup and debugging ⚜ Free trial configuration and conversion logic ⚜ Payment status handling and webhook events ⚜ Backend code review and issue resolution ⚜ Basic testing to ensure smooth billing flow ⚜ Optimization for reliability and user experience I have worked on multiple SaaS platforms, handling recurring billing, trial logic, and payment integrations with Stripe & PayPal. I’ll analyze your current system, identify issues, and implement stable fixes efficiently. Looking forward to discussing and resolving your billing flow seamlessly. Warm Regards, Farhin B.
$140 USD in 7 days
6.5
6.5

**SaaS ** Hi, I am a SaaS backend specialist with 14+ years of experience fixing and optimizing payment, subscription, and billing systems. I’ve worked extensively with Stripe, PayPal, and recurring billing flows, including trial-to-paid conversions and webhook handling. I understand this is not a build-from-scratch, but a debug + stabilization task—I’ll review your Python/Go backend, identify gaps, and fix the entire billing lifecycle. What I’ll handle: ✔ Fix payment integration & subscription logic ✔ Correct trial setup + seamless trial-to-paid conversion ✔ Reliable webhook/event handling (Stripe/PayPal) ✔ Payment status sync & edge case handling ✔ End-to-end testing of full billing flow Why me: Strong experience with SaaS billing systems Skilled in debugging existing codebases (Python/Go) Focus on stability, accuracy, and edge-case handling I can quickly audit your system and explain exactly what’s broken and how to fix it. Let’s connect.
$140 USD in 7 days
6.1
6.1

I've fixed broken SaaS billing flows exactly like yours—payment integration issues, trial logic gaps, and webhook failures in Python and Go backends built with AI tools, which tend to produce structurally sound code with subtle billing edge cases. My approach: first, I'll audit your current payment integration and subscription lifecycle end-to-end, mapping the exact points where trial setup, trial-to-paid conversion, and payment status handling break down. Then I'll fix the Stripe/payment provider integration, ensure webhooks reliably sync subscription state, and implement proper idempotency and error handling so no payment event is lost. I've shipped production billing systems handling recurring subscriptions and free trials for multiple SaaS products. I can start immediately.
$30 USD in 1 day
5.9
5.9

SaaS Hello, I understand you need a fully automated GoHighLevel system so you can focus on operations, not CRM management. I specialize in building end-to-end workflows for local service businesses with strong focus on lead conversion and retention. I will set up high-converting lead capture forms and landing pages. All leads will flow into segmented pipelines with proper tagging and source tracking. Facebook and Instagram ads will be integrated directly into GoHighLevel. I will implement instant auto-response (SMS + email) to maximize speed-to-lead. Calendar booking system will be configured with automated confirmations and reminders. Two-way communication will be enabled to reduce no-shows and friction. Follow-up sequences will nurture unbooked leads automatically. Post-service automation will trigger surveys, reviews, and referral incentives. I will build your 3 core email systems: Welcome series to convert new leads. Monthly promotional campaigns for repeat business. Educational drip campaigns to build authority and trust. Dashboard will clearly show lead sources, pipeline stages, and booking metrics. All workflows will be tested end-to-end with real data before delivery. You will receive a Loom walkthrough explaining how to manage content safely. System will be clean, scalable, and easy to maintain long-term. Timeline: 5–7 days total setup and testing.
$140 USD in 7 days
5.8
5.8

SaaS Hi✋, I'm a backend developer with strong Python + Go experience and deep expertise in SaaS billing systems. ✔️ Payment Integration Expert – Stripe/PayPal setup, subscription flows, free trial logic ✔️ Debugging Specialist – Review existing AI-generated code, identify issues, fix billing flow ✔️ Webhook & Status Handling – Payment status sync, trial-to-paid conversion, event handling ✔️ Testing Included – Full billing flow verification Similar work: Fixed Stripe subscription logic for 3 SaaS platforms, resolved trial conversion bugs, implemented webhook reliability. Let me review your codebase and fix your billing flow.
$140 USD in 7 days
5.5
5.5

Projects like this don’t wait around, the faster it’s built right, the faster it pays off. That’s why I’m jumping in now. You need not just a fix but a thorough audit of your existing backend’s subscription and payment architecture to ensure every transaction flows flawlessly and every trial converts smoothly. Stability and precision in billing are paramount for your platform’s trust and growth. Based in the UK, DigitaSyndicate recently enhanced the payment processes of a SaaS client managing over ten thousand active subscriptions, improving their billing accuracy and trial conversion rates. Our team’s expertise in Python and Go backend systems, combined with in-depth experience integrating Stripe and PayPal, ensures swift yet meticulous optimisation without disruption. Have you considered the resilience of your webhook event handlers under peak load and potential race conditions that might affect payment status accuracy? This is the moment to partner with an agency that delivers at the highest level — connect now. Casper M. DigitaSyndicate
$200 USD in 14 days
5.5
5.5

SaaS I have strong experience working on existing backend systems built with Python and Go, especially debugging and stabilizing billing and subscription flows. I’ve integrated and fixed payment systems using Stripe and PayPal, including handling subscriptions, free trials, trial-to-paid conversions, webhook events, and edge cases like failed payments or inconsistent states. I’m comfortable jumping into an AI-generated or prebuilt codebase, quickly identifying issues in the current billing logic, and implementing clean, reliable fixes. I focus on making the entire payment flow smooth, fully tested, and production-ready, and I can clearly explain what’s broken and how it’s resolved.
$100 USD in 3 days
5.2
5.2

As a Backend Developer with extensive experience in SaaS billing systems, I am confident in my abilities to assess, debug, and optimize your existing platform and its payment functionalities. My proficiency in both Python and Go aligns perfectly with your stack, ensuring a smooth integration and fluid, secure billing process. On top of the language expertise, I have managed payment setups with Stripe and PayPal for similar SaaS platforms, setting up subscriptions, free trials, and trial-to-paid conversion. I've also handled webhook events and can apply that knowledge to enhance your system's reliability. In previous projects, I have consistently displayed excellent debugging and troubleshooting skills – for both new and existing systems – which enables me to quickly identify areas of improvement and deliver impactful solutions. Rest assured, my coding solutions are not only focused on solving the immediate issues but also maintenance-friendly for long-term stability. Overall,I bring a comprehensive skill set that your project demands. Let's make your payment system stable, smooth, and reliable for all users!
$140 USD in 7 days
5.3
5.3

SaaS Hello! I understand that you need an experienced backend developer to review and enhance the billing flow of your existing SaaS platform, ensuring a stable and reliable payment system for your users. Your goals of improving payment integration, subscription flow, and trial conversions are clear and important for user satisfaction. I have extensive backend development experience with both Python and Go, and I have successfully worked on several SaaS billing systems, including integrations with payment providers like Stripe and PayPal. My strong debugging and troubleshooting skills allow me to quickly assess existing codebases, identify issues, and implement effective solutions. To achieve your project goals, I would take the following approach: - Conduct a thorough review of your current backend logic and payment flows. - Identify and address issues in the payment integration, subscription management, and trial setups. - Implement necessary changes to ensure proper handling of payment statuses and webhook events. - Perform basic testing to validate that the entire billing flow operates smoothly. I am eager to start working on this project and am confident in delivering quality results within your timeline. Let’s discuss the details further and ensure your payment system meets your expectations!
$30 USD in 7 days
4.9
4.9

Hello, I came across your project Need a Backend Developer to Fix SaaS Payment Integration, Subscription, and Trial Setup and I am very interested in working with you. I have reviewed your requirements and fully understand the scope and expectations. I specialize in PHP, Java, Python, Golang, PostgreSQL, React.js, Stripe, Backend Development, API Development, Vibe Coding and have successfully delivered similar projects before. I am committed to delivering high-quality work with reliability, clarity, and professionalism. I work transparently throughout the project so progress, deadlines, and expectations stay clear at every stage. I would be glad to discuss further details and am ready to start immediately. Looking forward to hearing from you. Regards, Anum
$140 USD in 3 days
5.1
5.1

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