Senior Full-Stack Developer (Claude Code) - Trading Card Portfolio & Pricing Platform

We’re building Karton - a portfolio and market intelligence platform for collectible cards, starting with Pokémon. We already have a working prototype built with React, TypeScript, Supabase and Bun, along with the schema and a detailed product spec. Now we’re ready to build the full production platform. We’re looking for a strong developer who can own the technical build end-to-end, with a major focus on: Integrations with multiple pricing and market data sources Building reliable data ingestion pipelines Matching card variants across different sources Price aggregation and market analytics Price history, trends, liquidity and scarcity Taking the existing prototype into production Strong experience with integrations, data and analytics is extremely important for this role. We work primarily with Claude Code, so hands-on daily experience with it is required. This is a long-term position working directly with us on building the full platform. Interested? Send me a DM with your experience and examples of relevant systems you’ve built.