Completes on time and in full.
14
0
Budget: 20000 UAH Deadline: 30 days
I will eliminate user loss at the registration stage by reconfiguring Celery queues for guaranteed delivery of AWS Cognito codes, and I will fix the validation logic for Play Market Billing checks on the backend.
What specific technical method are you currently using to process transactions: do you have Google Cloud Pub/Sub and Real-time Developer Notifications (RTDN) for Play Market connected so that your FastAPI reliably receives payment statuses (refunds, cancellations, success) directly from Google servers, avoiding desynchronization of the Postgres database with the actual state of purchases?
The audit plan for asynchronous tasks and the exact budget for fixing these critical bugs is ready to be discussed in personal correspondence. 🤝
5
0
Budget: 3000 UAH Deadline: 1 day
Good day. I am a Middle Python Developer with over 3 years of commercial experience. To accurately assess the timelines and costs, it is necessary to review the code, as the errors can vary greatly in complexity and time to fix.
Budget: 3000 UAH Deadline: 3 days
Good day.
I am familiar with the stack and have extensive experience with FastAPI and databases. I have fixed similar bugs with Google Play payments.
1
0
Budget: 3000 UAH Deadline: 3 days
Hello!
I am interested in your project. I have experience working with Python backend and setting up the logic of mobile services. I have a good understanding of client-server interaction architecture, which is critical for both of your tasks.
How I plan to solve your tasks:
Play Market Payments: I will analyze the logic of processing Webhooks from Google Play. Often the problem lies in the validation of the purchase token on the server side or in delays in updating the status in the database. I will check the logs, fix payment processing errors, and ensure the correct accrual of in-game services.
Resend confirmation code: I will optimize the resend mechanism (Rate Limiting). I will set up correct timers (for example, 60 seconds before a resend request) and check the integration with your SMS gateway or Email service to ensure codes are sent reliably and without duplication.
Why you should choose me:
Linux/Python stack: I work in a Linux environment, which allows for quick deployment and testing of backend solutions.
Security: As a cybersecurity specialist, I pay special attention to protecting transactions and preventing the interception of confirmation codes.
Clean code: I write structured code that is easy to maintain in the future.
I am ready to conduct an audit of the current implementation and start making corrections today. Please message me privately to discuss access to the code and details of the technical specifications.
Best regards!
9
0
Budget: 3000 UAH Deadline: 1 day
Good day, Julia!
In general, the task is clear, but for an accurate response regarding deadlines and price, I would like to clarify some questions that arose after analyzing your task.
Please write in private messages – we will discuss the details and your wishes.
14
0
Budget: 4000 UAH Deadline: 3 days
Hello, Yulia! I am Nina, the manager of engineer-architect Valentin.
We are ready to promptly conduct an audit of your backend and fix errors in the financial logic and registration system. Valentin specializes in Python/FastAPI and has experience with AWS infrastructure.
Our action plan:
Play Market Billing: We will set up reliable server-side receipt verification and status synchronization through Google RTDN. This will eliminate situations where the payment has gone through, but access in the game has not appeared.
AWS Cognito & OTP: We will refine the logic of resend_confirmation_code. We will implement a Rate Limiting mechanism (via Redis or Postgres) to avoid spam blocks from AWS and ensure correct timers for users.
Celery/AWS Infra: We will check the task queues that process payments to eliminate possible transaction "hangs."
Valentin works on the principle of "first clean architecture, then code," so the fixes will not break adjacent modules.
Budget: 3000–5000 UAH (depending on the state of the current code).
Deadline: 2–3 days.
Yulia, do you have Real-time Developer Notifications (RTDN) from Google enabled, or are we currently relying only on requests from the application?
2
0
Budget: 3000 UAH Deadline: 3 days
Hello! I have experience working with PostgreSQL and integrating payment systems. The task of fixing payment errors in the Play Market and setting up Resend is clear to me. Although the main project stack is Python/FastAPI, I confidently work with similar architectures and API integrations.
What I offer:
Play Market: I will analyze the transaction processing logic and fix errors in the backend.
Resend: I will set up stable sending of confirmation codes during registration.
Databases: I will optimize queries to Postgres if necessary for stable operation.
I am ready to start the code audit immediately after gaining access. Estimated completion time: 2–4 days.
6
3
Budget: 3000 UAH Deadline: 3 days
Good day, madam!
I am ready to complete your task!
Write in private messages, we will discuss your project and agree on the price.
Oleksandr Z.
Winning proposal
14
0
Budget: 12000 UAH Deadline: 8 days
Hello! I can implement it. Write to me privately to discuss all the details. I will be glad to cooperate!
47
0
Budget: 3000 UAH Deadline: 1 day
Hello, I will make the changes, I have the relevant experience.
Write to me privately.
I will be happy to help you!
0
0
Budget: 3000 UAH Deadline: 2 days
Python, FastAPI, PostgreSQL, AWS, Cognito, Celery — the stack fully matches my experience. I have worked with Google Play Billing API (server-side purchase verification, processing webhooks from Google), integrating AWS Cognito (including custom registration flows, resend verification code). I understand the specifics of asynchronous processing through Celery. To provide a more accurate estimate — I need to look at the error logs and the current implementation of the payment flow. I am ready to connect and quickly figure it out.
1 286
1
Budget: 3000 UAH Deadline: 1 day
Hello. I have extensive experience with FastAPI. Can I review the project and the edits?
41
4
Budget: 3000 UAH Deadline: 3 days
Good day!
As a Back-end developer in Python with experience in FastAPI, PostgreSQL, AWS, Cognito, and Celery, I am ready to effectively fix the payment errors in Play Market and refine the resend confirmation code feature for your game Lila.
Message me privately, and we will clarify the details.
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