Full-Stack Developer (Node/PostgreSQL/React) for Long-Term SaaS Dashboards

We’re building a suite of B2B SaaS tools for Amazon sellers and agencies. This is a long-term position, not a one-off project. You will be our primary developer as we build and maintain multiple dashboards and web applications over the coming years. You need to be comfortable owning a codebase, making technical decisions, and shipping real product – not just small CRUD apps. The core stack we expect you to use:– Backend: Node.js (TypeScript preferred) with REST APIs (Express/Fastify). Python (FastAPI) for ETL/background jobs is a strong plus– Frontend: React (Next.js or SPA), component-based UI, responsive design, light/dark mode basics– Data: PostgreSQL (preferred) or PostgreSQL + some MongoDB, schema design for multi-tenant SaaS, aggregations, indexing– Infrastructure: basic AWS / cloud deployment, Docker, Git/GitHub, simple CI/CDWhat you’ll actually be doing (first project – Account Health Dashboard):– Implement backend services that ingest JSON/CSV reports from Cajari (Amazon Seller Central data extraction), normalize them, and store them in a multi-tenant database– Design and implement database schemas for clients, seller accounts, policy violations, metrics snapshots, and workflow/work history– Build a secure backend with role-based access (Admin, Staff, Client) and strict tenant isolation on every query– Expose clean REST APIs for the frontend (metrics, trends, filters, pagination)– Turn detailed dashboard designs (tables, filters, charts, badges) into reusable React components– Implement account-health KPIs, trends, and alert logic on the backend and surface them cleanly in the UI– Handle pagination, filtering, and sorting for large datasets (10k+ rows per account)– Pay attention to reliability, data validation, and simple but solid error handling throughout the stackWhat you’ll do next (this is ongoing work, not just one dashboard):– Build additional monitoring dashboards for different Amazon / e-commerce data sources– Develop client-facing reporting tools and self-service portals– Create internal operations and case-management applications for our team– Implement automation and workflow tools (alerts, queues, background jobs, scheduled reports)– Help shape architecture decisions as the product suite grows over timeRequirements:– 3–5+ years of full-stack experience with Node.js and React (Python experience is a strong plus)– Very comfortable designing relational schemas and writing clean, efficient SQL queries (PostgreSQL strongly preferred)– Proven experience building at least one serious dashboard or B2B SaaS product end-to-end (not just tutorials)– Strong understanding of authentication, authorization, and multi-tenant patterns (tenant_id, RBAC, etc.)– Ability to read existing HTML/CSS or Figma and refactor it into reusable components instead of starting from scratch every time– Solid Git/GitHub habits, code reviews, and basic testing (unit/integration)– Good written English and willingness to communicate clearly in async updates and short Loom walkthroughs when neededNice-to-have:– Prior experience with Amazon Seller Central or other e-commerce dashboards– Familiarity with queues/background workers and ETL/data pipelines (BullMQ, Celery, cron-based workers, etc.)– Experience with charting libraries (Recharts, Chart.js, etc.)– Experience deploying and operating apps on AWS or similar cloud providersThis is NOT a one-off project.We are looking for a long-term partner who can stay with us, own the codebase, and continue building additional dashboards, internal tools, and web applications after the first version ships. When you apply, please:– Answer the screening questions carefully– Include links to 1–2 dashboards or SaaS apps you actually built (GitHub and/or live demos)– Briefly confirm your weekly availability and your timezone Apply tot his job