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Development of a Telegram bot in C# (.NET) with integration via gRPC

C#, Data Parsing — incorrectly specified categories?

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A Telegram bot is required to serve as a client interface for our system. The bot should be as lightweight as possible. All main business logic and database interactions are handled on the backend side. The bot's task is to interact with the user, collect data from them, and exchange it with the backend using the gRPC protocol.

The project should be implemented on the .NET 8 / .NET 9 platform using the Telegram.Bot library (or an actively supported alternative framework in C#).

Functional Requirements

1. User Interface (User Flow)

Authorization / Registration: Upon first launch (/start), the bot requests the user's phone number via the standard Telegram contact sending button. This data is sent to the backend for verification or registration.
Main Menu: A persistent Inline or Reply menu with the following sections:
- My Profile: Display the current user status, balance, and active subscriptions (data is requested from the backend).
- Create Application: A step-by-step scenario for filling out a text application. The bot sequentially collects: title, description, and attached file (if any), after which it sends the data package to the backend.
- Application History: A list of the last 5 user applications with their current statuses.
Notifications (Push): The bot must be able to receive asynchronous messages from the backend and instantly forward them to specific users (e.g., about changes in application status).

2. Technical Architecture and Integration

gRPC Client: A gRPC client must be implemented within the bot. We will provide ready .proto files describing contracts for:
- User authentication (AuthenticateUser)
- Getting profile (GetUserProfile)
- Submitting an application (CreateApplication)
- Getting the list of applications (GetApplicationList)
Message Streaming: To send notifications from the backend to the bot, it is necessary to implement gRPC Server Streaming or support duplex streaming (to be discussed at the start stage).
Local Storage: The bot should not have its own heavy database. To store temporary user states (FSM / Finite State Machine) while filling out forms, a distributed cache (e.g., Redis) or built-in RAM with the ability to quickly switch to external storage should be used.

Proposals 8

Svyatoslav Adamov

0 0

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Rating 260

Budget: 5000 UAH Deadline: 11 days

I read the description of your project. It interests me, and I have experience with similar tasks. I am ready to start working and complete it with high quality.
Questions about the project:
1. Can you send the .proto files and describe the format of the backend responses?
2. What streaming option for notifications do you plan to use?

Katerina Kopicheva

5 0

Budget: 3200 UAH Deadline: 3 days

From the .proto files, the contracts AuthenticateUser and CreateApplication are visible — I will create a gRPC client on Telegram.Bot (.NET 8), and I will move the FSM for the step-by-step application (title, description, file) to Redis to keep the bot lightweight. I will implement push notifications through server streaming. The deadline is about 3 days.

Roman Smolyakov

30 1

Budget: 700 UAH Deadline: 1 day

Hello, Maxim! My name is Roman, I specialize in developing server solutions in C# and .NET, I have experience integrating through gRPC, working with Redis for caching and state management, as well as developing Telegram bots. In particular, I have previously created bots that interact with internal APIs and implemented FSM based on Redis, which allows for effectively storing users' intermediate states.

My approach to the project includes the following steps: first, I will connect the gRPC client to the bot using the provided .proto files, integrate authorization through Telegram contact, create a lightweight interface with an inline menu and FSM for filling out applications, and also set up server streaming to receive messages from the backend. Bonus — free code editing for a week after completion.

Roman S.

2 0

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Rating 472

Budget: 15000 UAH Deadline: 5 days

Hello! I have extensive experience in development on .NET 8/9 and working with the Telegram.Bot library. The task of creating a lightweight client with gRPC integration is clear to me: I will implement an FSM for user scenarios, configure the gRPC client according to your .proto files, and ensure proper handling of notification streaming. For storing states (FSM), I will propose an optimal solution considering your scalability requirements. I am ready to discuss the implementation details and start working. Feel free to write, I would be happy to collaborate.

Bohdan Tereshchenko

0 0

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Rating 374

Budget: 3600 UAH Deadline: 3 days

Regarding .proto, should we implement notifications as a duplex stream right away or start with Server Streaming? I am developing a bot on .NET 8 + Telegram.Bot, a gRPC client for the contracts AuthenticateUser, GetUserProfile, CreateApplication, GetApplicationList, and the application FSM on Redis. I will show the working flow in 3 days.

Dmytro Parkhomenko

20 0

Budget: 1000 UAH Deadline: 1 day

Good day, I am ready to complete your task quickly and efficiently. I have extensive experience in creating various bots. Please write to me in private messages to discuss the details. I would be happy to help :)

Maksym Kotsiubeinyk
Ukraine

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Rating 183