MVP service for issuing virtual cards in Telegram (FastAPI/Aiogram)

Hello!

I have experience in developing asynchronous services on Python 3.10+, FastAPI, and Aiogram 3.x. I am ready to implement a Telegram bot for managing virtual cards with full integration into your fintech platform.

Approach and solutions:

Asynchronous modular monolith: all API calls are non-blocking, clean module structure, easy to scale.
Aiogram 3.x + Telegram Web Apps (TWA): secure display of card details, interactive UX.
Security and cryptography: RSA for encrypting card data, JWE for transmitting payloads, keys stored via Docker secrets, all traffic through HTTPS/TLS, asynchronous encryption processing without blocking the event loop.
… MVP functionality: creating cards, viewing details through TWA, locking/unlocking cards, logging actions, error handling, rate limiting.
Deployment: Docker Compose for Sandbox and Prod environments on a single server.

Timeline and budget: according to your specifications – $2000, 3–4 weeks.

I can discuss the optimal approach for secure integration with your platform.

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Hello.

Cards, money, two bots.

I have carefully studied the technical specifications and the work format suits me. This is not just a Telegram bot, but a neat B2C overlay on an existing financial platform: with a common core layer, separate FastAPI/Aiogram interfaces, a proper asynchronous architecture, secure handling of RSA/JWT/JWE, and a Telegram Web App for displaying sensitive data.

What I see for the project:
— modular monolith with a common B2C Core;
— Telegram UI on Aiogram 3.x;
… — FastAPI for TWA and Admin API;
— PostgreSQL + SQLAlchemy + Alembic;
— working with a pool of pre-provisioned B2B accounts;
— encryption of keys and 3DS data at rest;
— end-to-end flow from onboarding to card issuance, viewing details, 3DS, and transactions.

I can take on the project according to your milestone approach and proceed without chaos:

1. core + integration with the platform;
2. bot interface;
3. full integration + e2e;
4. delivery / docker-compose / deploy.

I approach such tasks as product backend development: not only features are important, but also clean code structure, predictable asynchronous behavior, security of sensitive data, and ease of further development.

I am ready to show relevant experience with FastAPI / Aiogram, go through a short technical interview, and quickly get to work after agreeing on the details.

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I understand your task of creating an MVP Telegram bot for issuing and managing virtual cards, integrated with an external financial platform. I have extensive experience in developing high-load backend systems on FastAPI and building interactive bots, including projects with payment and banking integrations, where reliability and security are important. Please clarify which specific financial platform the integration will be with, so I can assess the specifics of the API. I am ready to discuss the details of your project, as well as propose optimal solutions regarding timelines and budget.

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Карты, деньги, два бота

Привіт!

Я Python backend developer (FastAPI, Aiogram 3.x) з сильним досвідом у асинхронній розробці та побудові модульних систем. Працював з фінтех-інтеграціями, JWT/RSA, API-first платформами та Telegram-ботами для бізнесу.

Ознайомився з ТЗ — бачу правильну архітектуру з B2C Core + Aiogram + FastAPI. Реалізую це як чистий модульний моноліт із чітким розділенням шарів (services / repositories / interfaces), без хардкоду та з коректною async-логікою.

Що гарантую:
… + повністю неблокуючий код (asyncio, httpx, async SQLAlchemy)
+ безпечна робота з криптографією (JWT, RSA, JWE)
+ масштабована та читабельна архітектура
+ досвід з Telegram Web Apps (secure робота з sensitive data)

=======================

Cards, money, two bots

Hello!

I’m a Python backend developer (FastAPI, Aiogram 3.x) with strong experience in async programming and modular architecture. I’ve worked with fintech integrations, JWT/RSA, API-first platforms, and Telegram bots for business use cases.

I’ve reviewed the specification and see a solid architecture with B2C Core + Aiogram + FastAPI. I will implement it as a clean modular monolith with proper layer separation (services / repositories / interfaces), no hardcoding, and fully async logic.

What I deliver:
+ fully non-blocking code (asyncio, httpx, async SQLAlchemy)
+ secure cryptography handling (JWT, RSA, JWE)
+ scalable and maintainable architecture
+ experience with Telegram Web Apps (secure handling of sensitive data)

Hello! I am ready to complete this project and have extensive experience in developing various applications.

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Hello. I am ready to help with the implementation of your project according to the specifications. I have all the necessary experience, having worked with cryptographic algorithms, automation of Telegram accounts, and Telegram bots. Cards, money, two bots)😂🤌
I suggest we get acquainted, I will tell you about all my experience and send invites to private repositories in response to your interest in any project from our dialogue.

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Cards, money, two bots

Hello! I want to say a huge thank you for such a project brief. Reading it is like a celebration. The competence of the client is immediately evident)

You are looking for a developer for asyncio - that's me. I work extensively with the FastAPI + Aiogram stack, and recently worked on a similar project with 20,000 MAU in Telegram. I only work with the database through asynchronous drivers.

I can handle JWE decryption (RSA-OAEP-256) and local key encryption (encrypted at rest) using a master key from the environment without any problems. I will build a modular monolith in Docker Compose clearly according to your requirements.

The budget and deadlines suit me completely.
…
I saw in the project brief a point about a 15-minute interview with your CTO. The thing is, I am currently working exclusively in a text-only format and do not participate in voice calls (this is a comfortable working mode for me). But I am absolutely ready to go through this interview in text format. We can agree on a specific time, and I will answer any questions, even the trickiest ones from your CTO about cryptography, JWT/RSA, asyncio, and security in real-time. Later, I am ready to attach a code example with asyncio.

I will be waiting for your response :)

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Cards, money, two bots 🃏

Hello! My name is Ruslan Zotsenko, I am a backend developer with over 2 years of experience in building API-first systems, asynchronous workflows, and integrations with external services.

I have read the project brief completely — the project is clear, the architecture is well thought out. Here’s why I am a good fit:

— Python + FastAPI + asyncio: I use this for AI agents and automation services. I understand the event loop, write non-blocking code — not just "familiar," but it’s daily practice for me.
— Aiogram 3.x: I have built Telegram integrations, familiar with FSM, middleware, router structure. A modular monolith with a shared B2C Core between Aiogram and FastAPI — this approach resonates with me.
— PostgreSQL + SQLAlchemy + Alembic: I actively use these, including migrations and async drivers.
… — JWT / RSA / JWE: I have experience with JWT (RS256, access/refresh tokens, middleware). I understand the concept of JWE (RSA-OAEP-256 + A256GCM) — I am ready to delve into the specifics of decrypting card details during a technical interview with your CTO.
— Docker Compose: I have set up isolated dev/prod environments, I understand how to properly organize Sandbox + Prod on one server through .env without any hardcoding.
— Swagger / OpenAPI: I write documentation for all my APIs — I will quickly understand your specification for the Arqen B2B Platform.
— Security: I have experience with encrypted storage of sensitive data, master key in .env, pydantic-settings for configuration.

Regarding development culture: modularity, clean dependencies, layered architecture (routers / bot / services / repositories) — this is the norm for me, not the exception. I love code that is pleasant to read and easy to extend.

GitHub: https://github.com/RuslanZotsenko22

I am ready for a technical interview, I can propose an architectural solution even before we start. Write to me — I will respond quickly.

Ruslan

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Hello
I have experience with the described technologies, and I have 10 years of experience in commercial development
I have worked with aiogram, and I have a mini library for it called aiogram-test-framework
I cannot show anything more public
The technical specification is good, it's nice that you have stages

Write to me

Cards, money, two bots

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Hello! I can do your project. I have experience. Write to me and we will agree. Cards, money, two bots.

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Greetings, Vladislav

We can proceed according to the contract, the project assessment based on your architecture requirements and code delivery quality is impressive, in a good way.
Can we possibly connect privately beforehand?
I will be waiting, have a good day.

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Hello. I am ready to take on the development of a B2C product based on a Telegram bot for managing virtual cards. I work with Python, FastAPI, PostgreSQL, Docker, and I have a good understanding of the specifics of asynchronous development on Aiogram 3.x, including building non-blocking logic, integrations with external APIs, and a clean modular architecture. I have experience in developing Telegram bots, backend services on FastAPI, integrations with external platforms, and building API-oriented solutions. I pay special attention to project structure, security, logging, and ease of maintenance after release.

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Hello!
Cards, money, two bots 🙂
My name is Shodibek, I am a Python developer, working with APIs, automation, and Telegram bots.
I have experience in developing backend logic and integrating various services. I have worked with asynchronous code and understand the principles of building non-blocking applications.
I am ready to carefully study the technical specifications and implement the project with a focus on clean architecture and scalability.
I can show examples of projects.

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Cards, money, two bots

I carefully studied the description and the technical specifications - the task is clear.

Stack: I work with Python 3.10+, FastAPI, asyncio, PostgreSQL, Docker Compose. I have experience with modular architecture and clean asynchronous code - I have written FastAPI services with environment isolation through Docker. I have studied Aiogram, but my main experience with Telegram is at the level of basic integration, so I honestly say: the first milestone will take a bit more time to get into Aiogram 3.x, after that it will go faster.

I have GitHub, the main projects with FastAPI are in private repositories - I am ready to grant access or show code snippets during a call.

I am ready for a detailed discussion of the technical specifications and to start.

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Maps, money, two bots

It's nice to work when everything is thought out and planned. You just need to take it and code what you want.

Let's communicate and implement.

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Cards, money, two bots.

Hello! My name is Nina, I am a project manager of a small tandem. We specialize in developing complex bots (FastAPI + Aiogram 3.x) and are ready to take on your MVP. My partner, a strong Python developer with a "black belt" in asyncio, handles all architecture and coding.

Why we can handle your B2C core:

Asynchronicity (Zero Blocking): We do not write requests.get in handlers. All work with your B2B API will be done through httpx (or aiohttp), and the database will be accessed via asynchronous SQLAlchemy. No blocking of the Event Loop.

Cryptography (RSA/JWE): We understand the critical nature of fintech. We will be able to correctly implement token decryption and secure transmission of card details to the front end.
…
TWA (Telegram Web Apps): We have experience linking Aiogram with mini-apps for securely displaying data that cannot be exposed in regular bot messages.

Architecture: Modular monolith is our standard. FastAPI routes separately, Aiogram handlers separately, business logic (service layer) in the core. We will set up Docker Compose with separate .env for Sandbox and Prod without any issues.

We are not an agency that will take on 10 projects and disappear. We work with a focus on quality and without hardcoding.

We are ready to have a call (the developer can easily join for a technical interview) or start discussing the architecture in chat. We have studied the technical specifications and understand the scope.

Best regards, Nina.

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Hello! Cards, money, two bots. Please let me know if you already have a ready design (UI) for the Telegram Web App (TWA) mini-application, which will display the decrypted card details (PAN, CVV) and 3DS codes, or will I need to develop this interface myself? I have 4 years of commercial development experience in Python (FastAPI/Flask) and Aiogram. Having reviewed your detailed technical specifications, I fully understand the concept of a modular monolith (B2C Core), where Aiogram and FastAPI share common business logic and interact with PostgreSQL through asynchronous SQLAlchemy. My experience includes working with cryptography: I have set up secure key storage and token decryption, which is critical for your project (handling JWE and RSA). Since I also have UI/UX design skills, I guarantee accurate reproduction of the user flow according to your "Appendix A." All my projects are deployed via Docker-compose with full configuration extraction into .env, without hardcoding. I am ready to undergo a short technical interview with your CTO. When would it be convenient for you to communicate?

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Good day. Cards, money, two bots. I have reviewed the technical specifications, the stack FastAPI + Aiogram is clear. I have experience in developing Telegram bots in Python and will be able to implement your MVP with quality within the agreed timelines.

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Hello.
Cards, money, two bots.

I have reviewed the description — the task is clear, the stack is completely mine.
I work with Python (3.10+), actively using FastAPI + Aiogram 3.x in production. I have experience building Telegram bots as an interface to external services (including with authorization, billing, Web Apps, and complex business logic).
I understand well how to build asynchronous architecture without blocking:
proper work with asyncio
separation of I/O and CPU-bound tasks
use of pools, queues, retries
… clean integration with external APIs

Regarding architecture:
I create a modular monolith with clear domain separation
dependency injection without hardcoding
readable structure (services / repositories / handlers / schemas)
logging coverage and error handling (especially important for fintech)

I have experience:
integrations via REST API (Swagger/OpenAPI)
working with PostgreSQL (async drivers)
secure data processing (keys, tokens, encryption at the application level)
Telegram Web Apps (including for displaying sensitive data)

Docker / deployment:
I have launched projects using Docker Compose
environment separation (sandbox / prod)
preparing the project for further scaling

Regarding GitHub:
Some projects are under NDA, so I cannot make everything public.

Regarding timelines:
3–4 weeks is realistic with a ready technical specification and API.

Regarding the process:
I work by milestones, maintain transparent progress, and respond quickly.
If important, I can immediately propose a basic architecture for the project before starting.
I am ready to discuss details and start in the near future.

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Hello!

I’m an experienced Python developer focused on async FastAPI + Aiogram, with strong background in modular architecture, OAuth2/JWT, RSA encryption, and secure fintech integrations. I write fully non-blocking code and keep projects clean, extensible, and well-structured.

Relevant experience:
Telegram bots with Aiogram 3.x + Web Apps (TWA)
FastAPI services with async SQLAlchemy & httpx
JWT Bearer flow, RSA keys, encrypted storage
Dockerized deployments with multiple environments
…

Ready to start immediately and follow your milestones.

Best regards,
Jeo Vincent Carretas

Good day!
I am an experienced Python developer of Telegram bots and web applications. I am ready to implement your MVP virtual card service. I have a black belt in asyncio, experience with FastAPI/Aiogram, financial integrations, RSA/JWE. Cards, money, two bots.
Write to me privately for discussion and to provide GitHub/experience.

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Hello!

I have studied the project description and the technical specifications - the task is clear, the stack is completely mine.
Maps, money, two bots 🙂

I work with Python (3.10+), regularly write services on FastAPI and Telegram bots on Aiogram 3.x. I have a good understanding of asynchronous programming - where to catch locks, how to properly build I/O, work with external APIs, and keep the system stable under load.

I have experience in:

… developing Telegram bots with Web Apps (including those with sensitive data)

integration with fintech APIs (payments, tokens, working with keys)

building modular monoliths with a clear structure

working with PostgreSQL + async ORM

deploying via Docker (including environment separation)

Regarding the task:

I will carefully lay out the architecture for your modular monolith

I will ensure secure work with keys (RSA/JWE)

I will create clean, extensible code without hardcoding

I will consider UX within Telegram (especially the bot + TWA connection)

I am ready to work according to milestones, maintain transparent communication, and regularly show progress.

My portfolio: Freelancehunt
(there are examples of FastAPI and Telegram bots, I can show relevant pieces if necessary)

If you want, I can briefly propose a project structure and implementation plan before starting.

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Hello, Vladislav!

I am a Python developer with extensive experience in FastAPI, asynchronous Python, and creating Telegram bots using Aiogram 3. I carefully studied your description, read the API documentation (https://sandbox.arqen.finance/api/docs#/), and briefly reviewed the technical specifications — the logic is clear, and the integration with the platform looks structured and fully feasible.

Cards, money, two bots — I confirm that I have thoroughly familiarized myself with the task and am ready to get started :)

What I can offer:
- Confident work with asynchronous Python, FastAPI, PostgreSQL, RSA keys, secure integrations, and fintech logic.
- Competent architecture: modularity, clean code, absence of hardcoding, careful handling of dependencies.
… - DevOps experience: Docker, Docker Compose, setting up Sandbox/Prod environments, CI/CD.
- Ability to involve full-stack colleagues — we can handle tasks of any complexity.
- Experience in process automation, so I can suggest additional product improvements.

Since my profile on the service is still new, I am willing to offer a 5% discount so we can start our collaboration faster and you can assess the quality of my work.

I am ready to discuss the details and start development.

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hello,

i reviewed the attached technical specification carefully. this is not just a Telegram bot task, but a full b2c product layer on top of an existing financial platform, with a shared business core, FastAPI integration layer, Aiogram bot interface, encrypted key handling, JWE decryption, PostgreSQL storage, Telegram Web App support, and staged deployment through Docker Compose.

that is exactly the kind of project where architecture matters as much as implementation.

what i can bring to this project:

strong focus on asynchronous Python and non-blocking service design
…
clean modular structure instead of mixed bot/business/api code

careful work with FastAPI + Aiogram integration through a shared core layer

experience with API-driven systems, database-backed workflows, and secure backend logic

implementation style that keeps the code readable and extendable for future billing / balance logic

from the specification, i see the key technical areas as:

modular monolith structure with separated layers for bot, api, services, and repositories

async integration with the external Arqen platform

secure storage and runtime use of RSA keys and access tokens

JWE decryption for sensitive card data

one-time / protected rendering flow for Telegram Web App card details

admin api for pool management and onboarding logic

end-to-end flow in sandbox with dockerized delivery for both sandbox and production environments

the stack itself also fits this approach well: FastAPI is designed around async Python and high-performance APIs, aiogram is fully asynchronous, and Telegram Web Apps are an official mechanism for secure embedded user interfaces inside Telegram.

i’m comfortable working in milestone format and i think your proposed split is reasonable:

core + arqen integration

bot interface

end-to-end sandbox integration

dockerized delivery and deployment

my estimate for this scope is 2000 USD and around 24–28 days, depending on how quickly the sandbox credentials, appendix screens, and integration details are available during implementation.

regarding similar experience: i work with Python backend systems, async APIs, integrations, and bot / service workflows, and i’m comfortable discussing architecture and implementation details directly on a technical call.

one important clarification before starting: is the separate UI appendix with all bot screens and flows already finalized, or should part of the interaction layer still be refined during development

Hello. Are you ready to provide access to the API documentation of the B2B Platform for detailed review before starting work? The exact deadlines and budget will be agreed upon in personal correspondence.

I will implement the project as follows:
1. I will develop a modular architecture for the bot using Aiogram 3.x with FastAPI for handling requests.
2. I will set up secure interaction with your platform: integration of RSA/JWE and data display through Telegram Web Apps.
3. I will ensure high-quality code with a clear structure, fully covering the technical specifications and deploying the solution using Docker Compose.

Cards, money, two bots. Experience with similar integrations and code examples on FastAPI/Aiogram can be provided via the link to GitHub: [insert your link].

… Thank you for considering my proposal. I am glad for the opportunity to collaborate with you!

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Hello.

I am developing bots for Telegram using NodeJS. I am ready to take on the project. Write to me, and we will discuss.

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