E-commerce Startup Tech Consultant Needed

I'm seeking an experienced tech consultant/consultancy to assist in shaping the technical framework of my Marketplace E-commerce platform startup currently entering development. Your expertise will be pivotal in selecting the right tech stack and designing an efficient system architecture.

We have a budget and have looked into custom software or no-code/hybrid platforms such as Sharetribe, which at first suits the needs, however to reach the required functionality required for MVP, the cost once again blows out after development costing.

Key Responsibilities:
- Tech Stack Selection: Recommend and justify the most suitable technologies for our E-commerce platform.
- System Architecture: Design a scalable and robust system architecture that can accommodate future growth and features.

Our target market is electrical contractors (customers) and electrical wholesalers/distributors (Suppliers). We are honestly just looking for an unbias opinion to assist us in getting the wheels turning for development, and deciding if additional funding is a must have to start, or potentially there may be other ways to get around budget constraints to get started, and pivot to fully custom software once we start making a turnover.