You will get Fix or Build Your SaaS Billing with Stripe (Subscriptions, Webhooks)
Top Rated
Project details
Stripe billing is where many SaaS products break — and start losing money.
Failed payments, incorrect subscriptions, broken webhooks, and inconsistent states create support issues and block growth.
This project helps you fix or build a reliable Stripe billing system that works correctly in production.
You get a fully working subscription flow integrated into your SaaS:
• Subscriptions (trial, upgrade, cancel)
• Stripe Checkout & Customer Portal
• Webhooks with real-time sync and error handling
• Clean integration with your users, roles, and database
What’s included:
• Stable billing logic (no edge-case surprises)
• Tested controllers, routes, and integration flows
• Clear structure your team can extend safely
• Optional add-ons: multi-tenant billing, usage-based pricing
Ideal for:
• SaaS founders launching subscriptions
• Teams fixing broken or unreliable Stripe setups
• Products preparing for real users and revenue
Outcome:
A production-ready Stripe billing system you can trust — reducing errors, support load, and lost revenue.
Failed payments, incorrect subscriptions, broken webhooks, and inconsistent states create support issues and block growth.
This project helps you fix or build a reliable Stripe billing system that works correctly in production.
You get a fully working subscription flow integrated into your SaaS:
• Subscriptions (trial, upgrade, cancel)
• Stripe Checkout & Customer Portal
• Webhooks with real-time sync and error handling
• Clean integration with your users, roles, and database
What’s included:
• Stable billing logic (no edge-case surprises)
• Tested controllers, routes, and integration flows
• Clear structure your team can extend safely
• Optional add-ons: multi-tenant billing, usage-based pricing
Ideal for:
• SaaS founders launching subscriptions
• Teams fixing broken or unreliable Stripe setups
• Products preparing for real users and revenue
Outcome:
A production-ready Stripe billing system you can trust — reducing errors, support load, and lost revenue.
Programming Languages
PHP, JavaScript, PythonCoding Expertise
Performance Optimization, SecurityWhat's included
| Service Tiers |
Starter
$300
|
Standard
$900
|
Advanced
$1,900
|
|---|---|---|---|
| Delivery Time | 2 days | 4 days | 7 days |
Number of Revisions | 1 | 2 | 3 |
Number of Pages | 2 | 3 | 5 |
Design Customization | - | - | - |
Content Upload | |||
Responsive Design | - | ||
Source Code |
Optional add-ons
You can add these on the next page.
Multi-Tenant Billing
(+ 3 Days)
+$600
AI Usage-Based Plans
(+ 3 Days)
+$1,000
Custom Billing Dashboard
(+ 2 Days)
+$700Frequently asked questions
35 reviews
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TT
Tom T.
Aug 14, 2026
Full-Stack AI SaaS Consultant (Next.js + Replicate) - help me audit a potential acquisition
Sergei is AMAZING! Working with him was honestly a pleasure from start to finish!
I'm not a technical founder, and I came in needing someone to sanity-check an AI SaaS that I wanted to acquire, and man, I learned more in that one hour than I expected to. He walked me through the stack, flagged the real risks, and explained everything in simple language without using any technical jargon.
He's just a great guy to talk to. If you want a consultant who's sharp, honest, and easy to work with, Sergei is your guy. Can't wait to work with him again!
I'm not a technical founder, and I came in needing someone to sanity-check an AI SaaS that I wanted to acquire, and man, I learned more in that one hour than I expected to. He walked me through the stack, flagged the real risks, and explained everything in simple language without using any technical jargon.
He's just a great guy to talk to. If you want a consultant who's sharp, honest, and easy to work with, Sergei is your guy. Can't wait to work with him again!
SZ
Shu Z.
Jun 30, 2026
Fintech SaaS development
GS
Gaurav S.
Jul 4, 2025
Python API multi-tenant solution in aws
TP
Tim P.
Aug 9, 2024
SaaS Improvements: OpenAI ChatGPT integrations
Sergei and his team, BAUART are excellent to work with. I had a fairly complex project SAAS app (mindcrate.io) that had been botched by another dev who was sloppy and delivered poorly, security flawed code. I first reached out to Sergei to help me audit the code and determine why specific features weren't working. He gave me a full breakdown of what needed to be fixed and a executed a repair plan. Ultimately, I decided to overhaul the SAAS with a new UI and new features that Sergei, Konstantin and Anton diligently worked to deliver. It took longer than I would have liked, but I am very proud of the work and what they helped me bring to life.
Great team, smart guys and willing to go the extra mile. I highly recommend Sergei and BAUART for any of your hardcore SAAS, web app or AI projects. These guys are legit!
Great team, smart guys and willing to go the extra mile. I highly recommend Sergei and BAUART for any of your hardcore SAAS, web app or AI projects. These guys are legit!
TP
Tim P.
Feb 2, 2024
SaaS Improvement by AI: OpenAI ChatGPT Fixes and Integration
Sergei and his team are great to work with. I used them on a quick trial run to take over from another developer. They did a great job of fixing security issues, setting up the enviroment correctly and refactoring the code to get it up to professional level quality. Pushing forward with them on more sprints to help bring my product to an enterprise level. Highly recommended!!!!
About Sergei
Long-term technical partner for founders building serious B2B AI SaaS
100%
Job Success
Yerevan, Armenia - 9:35 pm local time
You bring the business. We take ownership of the technology.
We work with founders and business leaders who don’t want to manage developers, chase deadlines, or translate business requirements into technical tasks.
Our job is to take the entire technical side off your plate — from architecture and UI/UX to development, QA, DevOps, launch, support, and continuous product growth.
🚀 Built for the Long Term
We’re not trying to become another vendor you have to replace in six months.
One of our B2B SaaS clients has worked with us for 7+ years, investing more than $1M in continuous development, growth, and support. We’re still their technology partner today.
Another project started as a $7K MVP and grew into a $70K product because the foundation was designed for the product’s future — not just for getting version 1 out the door.
That’s how we measure success: not by how quickly we can finish your project, but by whether you can keep building on it years from now.
🏗️ Architecture Comes First
Before spending months and tens of thousands of dollars on development, we first make sure we’re building the right thing on the right foundation.
We turn your business requirements into a practical technical blueprint:
- what to build first
- what can wait
- how the product should evolve as you grow
- where the major technical and business risks are
- which integrations and infrastructure decisions matter
- what the development will actually require
You don’t need to understand message queues, cloud infrastructure, or database architecture.
You need to understand what each technical decision means for your business — cost, risk, speed, and future growth.
Once the foundation is right, our senior team takes it from there.
🤝 One Team. Full Technical Ownership.
You get a complete product engineering team under one roof:
Architecture → UI/UX → Development → QA → DevOps → Launch → Support → Continuous Development
No need to coordinate separate freelancers for frontend, backend, infrastructure, and QA.
No need to become your own technical project manager.
You have a single accountable team that understands the product and stays with it.
🔍 When Clients Come to Us
Usually, something has already gone wrong — or they want to make sure it doesn’t.
- The previous development team missed deadlines.
- Developers left and took critical knowledge with them.
- The codebase became difficult and expensive to change.
- The MVP has taken months longer than expected.
- The product needs integrations the current team can’t handle.
- The system isn’t ready for real users or growth.
- The founder is spending too much time managing development.
We’ve seen these situations before.
Cheap development isn’t cheap. It’s a mortgage you didn’t know you signed.
Our approach is built around predictable delivery, transparent communication, strong engineering practices, and long-term ownership.
🧩 What We Build
B2B SaaS & Business Platforms
- B2B SaaS platforms
- Multi-tenant SaaS
- Workflow & business management systems
- Custom CRM & ERP
- Marketplaces
- Internal business applications
AI Products
- AI SaaS platforms
- AI agents & AI assistants
- LLM-powered applications
- RAG systems
- AI automation
- Semantic search
- Production AI integrations
Product Development
- New MVP development
- SaaS development from scratch
- Existing product modernization
- Legacy system rescue & rebuild
- Third-party API integrations
- Long-term product development & support
🛠️ Technology
Backend: Python, FastAPI, Django, Node.js, NestJS, Laravel
Frontend: React, Next.js, Vue.js
Data: PostgreSQL, Redis, Supabase
Cloud & DevOps: AWS, Docker, Kubernetes, CI/CD, GitLab
AI: OpenAI, Claude, LLM APIs, RAG, embeddings, vector databases, AI agents
Integrations: Stripe, Salesforce, HubSpot, SAP, Authorize.Net, Twilio, SendGrid, Google APIs
SaaS Development · B2B Software · AI SaaS · MVP Development · Custom Software Development · SaaS Architecture · Software Architecture · Product Development · Technical Architecture · AI Development · AI Agents · OpenAI · Claude · LLM · RAG · React · Next.js · Python · FastAPI · Node.js · Laravel · API Integration · CRM · ERP · Multi-Tenant SaaS · AWS · Cloud Architecture · DevOps · CI/CD
🚀 Let’s Start With the Foundation
If you’re building a new SaaS product, replacing an unreliable development team, or trying to get an existing product back on track, let’s start by understanding the business — then design the technology around it.
👉 Send me 2–3 sentences about your product, where you are today, and what you’re struggling with. I’ll tell you whether we’re the right team to take the technical side forward.
Steps for completing your project
After purchasing the project, send requirements so Sergei can start the project.
Delivery time starts when Sergei receives requirements from you.
Sergei works on your project following the steps below.
Revisions may occur after the delivery date.
Review & Risk Check
Review your codebase and Stripe setup to identify issues and risks.
Billing Logic Setup
Configure plans, trials, webhooks, and subscription logic.