Fullstack Developer (React & FastAPI) – B2B

United States | Sept. 3, 2026

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Company: Ventum Digital Identity Services GmbH

Country: United States

Type: Onsite

Employment: Full-time

Description: Ventum IQ, part of the Ventum Group and focused on AI-driven solutions, is looking for support in developing the next generation of TenderIQ — an AI-powered multi-tenant SaaS platform for tender management in public procurement and other AI-based solutions. TenderIQ combines semantic search powered by a vector database, AI-based tender analysis, and an automated bid writer into one end-to-end platform. The system includes 200+ API endpoints, 15+ frontend pages, 12+ AI functions, and multi-tenant architecture with live updates via Server-Sent Events (SSE). TYPE OF COOPERATION Long-term B2B contract (self-employed contractor) We are looking for an experienced developer to join our team on a B2B contract basis. This is a long-term collaboration with a high degree of ownership and flexibility. YOUR ROLE You take requirements from product management and stakeholder conversations and implement them independently across the entire stack — from backend endpoint to persistence layer to React component. You understand that good implementation is more than “works locally”: it is multi-tenant safe, observability-ready, tested, and clearly documented. You won’t just execute requirements — you’ll also challenge and question them. YOUR TASKS • From tickets, user stories, or sketches, you independently build end-to-end features (backend endpoint, data model, frontend component, state, tests) • Frontend in React 19 with TypeScript, Zustand for client state and TanStack Query v5 for server state • Backend in FastAPI with Pydantic validation, SQLAlchemy models, and Alembic migrations • Persistence with PostgreSQL, MongoDB, Redis, and Qdrant • Server-Sent Events: 14 event types keep pipelines, dashboards, and detail views in sync • Code reviews, tests on critical paths, bug fixes that address root causes rather than symptoms • Multi-tenancy always in mind: every query, every endpoint, every permission must be tenant-clean YOUR PROFILE - MUST-HAVE • 2–5 years of professional experience as a fullstack dev, frontend dev with backend share, or backend dev with frontend share • Solid React skills with TypeScript (React 18+ required) • Python in web backend: FastAPI, Flask, or Django with understanding of asyncio, Pydantic, ORMs, migrations • SQL and relational thinking: joins, indexes, transactions — readable/writable/debuggable; PostgreSQL is a plus • Clean Git discipline (branches, PRs, rebases, merge conflicts) • Ability to work independently, proactive communication • Technically confident English; German is a plus, but not required NICE-TO-HAVE • MongoDB or other document DBs (aggregation pipelines) • Vector databases (Qdrant, Pinecone, Weaviate) and concepts (embeddings, ANN search) • DevOps affinity (Docker, container logs, simple CI pipelines) • Already familiar with Tailwind, Zustand, TanStack Query TECH STACK AT A GLANCE • Frontend: React 19, TypeScript, Vite, Tailwind CSS v4, Zustand, TanStack Query v5 • Backend: FastAPI, Python 3.12+, SQLAlchemy, Pydantic, Alembic • Realtime: Server-Sent Events via Redis Pub/Sub • Infrastructure: Docker, Docker Compose #J-18808-Ljbffr

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