.NET Architect for designing a product management system on marketplaces

We are looking for a .NET architect with experience in designing application and database architecture for a product management platform across multiple marketplaces.

We plan to work with 12 marketplaces, each of which uses a separate database to store product information (static and dynamic data, categories, stores, brands, competitor monitoring, and blacklists). We need to develop a unified logical database structure and application architecture that will integrate all the products we sell across different platforms.

The system must support:

• Tracking the source of the product (from which marketplace it was obtained),

• Managing where and at what price the product is listed,

• Publishing, updating, and deleting product listings via marketplace APIs,

• Data transformation (language, photo, description, categories) when transferring products between marketplaces.

Requirements:

We expect you to have:

• Confident experience in designing .NET application architecture (modular or microservices),

• Deep knowledge in designing relational databases, especially PostgreSQL, and experience building solutions designed for scale (100k+ records, dozens of operations per second),

• Experience with message queues (RabbitMQ, Azure Service Bus, etc.) and asynchronous task processing,

• Experience integrating external APIs (e.g., marketplaces or SaaS services),

• Understanding of data transformation and normalization principles from heterogeneous sources,

• Knowledge of approaches to logging, monitoring, and synchronization between systems.

Collaboration format:

Phase 1: Several hourly consultations to discuss the task and architectural proposals.
Phase 2: If we agree on the approach — we will hand over the architecture development and its documentation to you, with a possible transition to a broader technical/architectural role.

How to respond:

Please describe similar projects you have participated in — preferably in the field of e-commerce, multi-channel product management, or systems with large volumes of data and integration with external APIs.

We will be particularly interested in:

• Experience designing scalable systems using PostgreSQL (or similar DBMS),

• Managing products listed across multiple sales channels (marketplaces, online stores, etc.).