[Remote] Senior Backend Engineer - AI Product

Note: The job is a remote job and is open to candidates in USA. Re:Build Manufacturing is a growing family of industrial and engineering businesses focused on revitalizing US manufacturing. They are seeking a Senior Backend Engineer to build core services and AI infrastructure for an AI-powered platform in hardware product development, collaborating with engineering teams to transform unstructured inputs into structured artifacts.ResponsibilitiesDesigning and implementing RESTful APIs with OpenAPI specs and auto-generated client SDKs using SQLAlchemy and PostgresDeveloping ingestion pipelines using Celery and Redis that connect to tools teams already use (file storage, messaging, email) and extract structured engineering artifacts from unstructured inputsBuilding and extending agentic AI workflows using LangChain, LangGraph, and related frameworks for structured data extraction, risk detection, dependency analysis, and proactive team coordinationIntegrating LLM APIs (Anthropic Claude, OpenRouter) with streaming (SSE), error handling, and cost optimizationDeploying and operating services on GCP (Cloud Run, Cloud SQL, Memorystore) with TerraformWriting well-tested, maintainable code and participating in code reviews to establish engineering best practicesSkills5+ years building production backend systems, with 3+ years in PythonDemonstrated proficiency using AI coding tools (Cursor, Copilot, Claude, etc.) to accelerate developmentStrong experience with FastAPI or similar async Python web frameworksProduction experience with PostgreSQL, including schema design, migrations, and query optimizationHands-on experience with task queues and background processing (Celery, Redis, or similar)Understanding of API design, authentication patterns (OIDC/JWT), and service architectureExperience with containerized deployments (Docker) and CI/CD pipelinesAbility to balance rapid iteration with maintainable, well-tested codeHave worked in early-stage 0 to 1 startup environmentsProduction experience integrating LLM APIs (Anthropic, OpenAI, etc.) and building AI-powered features with agent orchestration frameworks (LangChain, LangGraph, or similar)Hands-on experience with GCP services (Cloud Run, Cloud SQL, Pub/Sub, Secret Manager) and Infrastructure-as-code experience with TerraformExperience with data ingestion pipelines and ETL workflowsBackground in B2B SaaS platforms, project management tools, or workflow automation productsUnderstanding of hardware development, engineering workflows, or project management concepts (phases, gates, dependencies)BenefitsFull health/dental/visionBonus programGenerous 401KPaid time offAnnual learning stipendParticipation in Re:Build's LTIP equity programOpportunity for founder equity in potential spin-outCompany OverviewRe:Build Manufacturing integrates design, engineering, and manufacturing to deliver complex, multi-technology products from concept through full-rate production. It was founded in 2020, and is headquartered in Framingham, Massachusetts, USA, with a workforce of 1001-5000 employees. Its website is https://www.rebuildmanufacturing.com.