Senior Backend Engineer AI Product

The Opportunity

If youve worked alongside hardware teams you know the damage that results from a missed change request or critical context that was never relayed to the right person. Reflow exists to close that gap. Were building the first AI-powered platform purpose-built for hardware product development one that listens across the tools teams already use maintains a structured picture of every program and proactively coordinates across disciplines when things inevitably change.

This is a ground-floor opportunity for a hands-on backend engineer to build the core services and AI infrastructure powering this platform with the support of a parent company leading innovation in engineering and manufacturing.

Who Were Looking For

Were seeking a backend engineer who ships reliable well-designed systems and takes ownership of the services they build. The ideal candidate has production experience with Python FastAPI and PostgreSQL and is comfortable building everything from REST APIs to background task pipelines to AI agent infrastructure. You should already be using AI coding tools like Cursor Copilot or Claude to accelerate your work with excitement about building the backend that powers the first AI-native platform for complex hardware development.

This senior engineer will work alongside our engineering team AI researchers and head of product to build the services that turn 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. The role is hands-on - you will be coding daily while contributing to system design decisions and helping establish backend engineering best practices as we grow.

What Youll Do

Your day-to-day responsibilities will include:

Designing and implementing RESTful APIs with OpenAPI specs and auto-generated client SDKs using SQLAlchemy and Postgres

Developing ingestion pipelines using Celery and Redis that connect to tools teams already use (file storage messaging email) and extract structured engineering artifacts from unstructured inputs

Building and extending agentic AI workflows using LangChain LangGraph and related frameworks for structured data extraction risk detection dependency analysis and proactive team coordination

Integrating LLM APIs (Anthropic Claude OpenRouter) with streaming (SSE) error handling and cost optimization

Deploying and operating services on GCP (Cloud Run Cloud SQL Memorystore) with Terraform

Writing well-tested maintainable code and participating in code reviews to establish engineering best practices

Technical Requirements

Must Have:

5 years building production backend systems with 3 years in Python

Demonstrated proficiency using AI coding tools (Cursor Copilot Claude etc.) to accelerate development

Strong experience with FastAPI or similar async Python web frameworks

Production experience with PostgreSQL including schema design migrations and query optimization

Hands-on experience with task queues and background processing (Celery Redis or similar)

Understanding of API design authentication patterns (OIDC/JWT) and service architecture

Experience with containerized deployments (Docker) and CI/CD pipelines

Ability to balance rapid iteration with maintainable well-tested code

Highly Valuable:

Have worked in early-stage 0 to 1 startup environments

Production 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 Terraform

Experience with data ingestion pipelines and ETL workflows

Background in B2B SaaS platforms project management tools or workflow automation products

Understanding of hardware development engineering workflows or project management concepts (phases gates dependencies)

What We Offer

Real Impact: The opportunity to build purpose-built tooling for an entire industry that has never had it

Customer Access: Direct exposure to hundreds of real hardware projects annually through Re:Builds engineering and manufacturing companies

Technical Growth: Hands-on work with cutting-edge AI technologies solving novel technical challenges

Autonomy: Backed by Re:Build while operating with startup independence

Benefits: Full health/dental/vision bonus program generous 401K paid time off annual learning stipend

Equity & Growth: Participation in Re:Builds LTIP equity program and opportunity for founder equity in potential spin-out

Compensation & Location

Location: Remote-first with preference for candidates in Boston Seattle Los Angeles or other cities with Re:Build offices

Compensation: Base salary range of $165000 to $215000 with performance bonus and long-term incentive plan offered. Potential equity stake under independent spinout scenario.

Please note this role is restricted to US citizens or lawful permanent residents only due to exposure to export controlled information.

About Re:Build Manufacturing

Re:Build Manufacturing is a growing family of industrial and engineering businesses combining enabling technologies operational superiority and strategic M&A to build Americas next generation industrial company. At Re:Build we deploy deep expertise in engineering operations management and technology to supercharge the performance of our member companies. We harness deep professional expertise and a candid principled operating culture to drive differentiated outcomes. Ours is a fast-paced environment where individuals can stretch and be challenged to pursue their fullest potential.

Re:Build was founded to pioneer a profitable model for the revitalization of US manufacturing. Weve assembled a powerful set of complementary capabilities and lines of business that enable us to pursue a wide range of end markets. Our acquired businesses are grounded in build-to-print and by-the-hour engineering and design services and were using their combined

expertise to migrate to increasingly sophisticated program development and production as well as the generation of our own products. Our unique set of capabilities lend themselves to highly complex systems and products and we offer customers a range of services including product and systems design automation fabrication assembly and large volume contract manufacturing. Our customers span a wide array of industries including aerospace defense mobility healthcare pharma biotech clean tech chemicals energy lifestyle food production and industrial equipment.

We want to work with people that reflect the communities in which we operate

Re:Build Manufacturing is proud to be an Equal Employment Opportunity and Affirmative Action employer. We do not discriminate based upon race color religion gender gender identity or expression sexual orientation national origin genetics disability age veteran status marital status parental status cultural background organizational level work styles tenure and life experiences. Or for any other reason.

Re:Build is committed to providing reasonable accommodations for qualified individuals with disabilities in our job application procedures. If you need assistance or an accommodation due to a disability you may contact us at or you may call us at 617.909.6275.