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Re:Build Manufacturing is building Reflow, an AI-powered platform purpose-built for hardware product development. The platform listens across tools teams already use, maintains a structured picture of every program, and proactively coordinates across disciplines when changes occur.
As a Senior Backend Engineer, you'll be a hands-on individual contributor building the core services and AI infrastructure powering this platform. You'll work alongside the engineering team, AI researchers, and head of product to transform unstructured inputs (call transcripts, emails, documents, datasheets) into structured engineering artifacts (requirements, project plans, dependencies), orchestrate ambient AI agents for proactive coordination, and serve real-time project intelligence to users.
Key responsibilities include:
- Designing and implementing RESTful APIs with OpenAPI specs and auto-generated client SDKs using SQLAlchemy and PostgreSQL
- Developing ingestion pipelines using Celery and Redis that connect to existing tools and extract structured engineering artifacts from unstructured inputs
- Building and extending agentic AI workflows using LangChain, LangGraph, and related frameworks for data extraction, risk detection, dependency analysis, and team coordination
- Integrating LLM APIs (Anthropic Claude, OpenRouter) with streaming, error handling, and cost optimization
- Deploying and operating services on GCP (Cloud Run, Cloud SQL, Memorystore) with Terraform
- Writing well-tested, maintainable code and establishing backend engineering best practices
Required qualifications: 5+ years building production backend systems with 3+ years in Python; strong FastAPI or async Python web framework experience; production PostgreSQL expertise; hands-on task queue experience (Celery, Redis); API design and authentication pattern knowledge; containerized deployment and CI/CD experience; demonstrated use of AI coding tools (Cursor, Copilot, Claude) to accelerate development.
Highly valuable: early-stage startup experience; production LLM API integration and agent orchestration framework experience.
