Full-time Senior Software Engineer in Los Angeles (HQ El Segundo) building full-stack features for the ION Factory OS using Python backend and Next.js/TypeScript frontend. Work includes GraphQL APIs, Postgres data models, AWS infrastructure, and testing with Pytest and Jest. The role requires 6+ years of experience and use of AI coding assistants such as Claude.

Senior Software Engineer

We're looking for a full-time Senior Software Engineer to join us in our mission of bringing the ION Factory OS to next-generation hardware builders around the globe. We are looking for engineers who leverage AI coding tools to build end-to-end features with unprecedented speed and quality.

Our newest recruit will join the First Resonance team full-time in Los Angeles, CA (HQ in El Segundo) as a foundational member of our product team.

Why This Role?

Are you excited by the opportunity to assist manufacturers working on eVTOLS, rockets, robots, and autonomous vehicles? We support companies tackling society’s greatest challenges: climate change, space exploration, and autonomous transportation.

We pride ourselves on being fast learners and agile executors. If you want to play a key role in the future of hardware and Industry 4.0 by wielding the latest in AI-assisted development, come join us!

Responsibilities & Duties

End-to-End Feature Ownership: Use AI-augmented workflows (Claude) to build and deploy full-stack features using Python (Backend) and Next.js/TypeScript (Frontend).
API & Data Architecture: Develop high-performance GraphQL mutations and queries; design relational database models in Postgres that reflect complex industrial processes.
Cloud Infrastructure: Build and maintain scalable services on AWS, leveraging modern infrastructure patterns.
AI-Driven Productivity: Lead the team in adopting AI tools to automate boilerplate, refactor legacy logic, and accelerate the "idea-to-production" cycle.
Technical Leadership: Write design specifications and diagrams (UML/System Flow) that guide both human teammates and AI agents.
Reliability: Drive code-level architecture, modularity, and comprehensive testing (Pytest, Jest) to ensure ion remains mission-critical for our customers.

Qualifications & Skills

6+ years of technical experience: You’ve built and scaled production-grade software.
AI-Native Workflow: You are "pro-AI" and actively use coding assistants to increase your output and code quality.
Backend Mastery: Expert-level Python skills with a deep understanding of ORMs (e.g., SQLAlchemy) and asynchronous processing.
Modern Frontend: Proficiency in TypeScript, React, and Next.js.
Cloud & Infra: Hands-on experience with AWS ecosystem and deploying multi-tenant SaaS environments.
API Design: Strong experience with GraphQL and architectural patterns like Domain Driven Design (DDD) or Event-Driven systems.
Problem Solver: You enjoy collaborating across departments and "flexing your creative muscle" to solve hardware-world problems with software.

Desired Qualifications

Experience with Infrastructure as Code (Terraform, CDK).
Experience building manufacturing tools or working in high-stakes industrial environments.
Experience writing complex ETL processes for industrial data.

Benefits & Perks

Health & Wellness: Comprehensive medical, vision, dental, and life insurance.
Ownership: Employee Stock Option Plan and 401K.
Flexibility: Unlimited PTO and hybrid work schedule.
Culture: Paid parental leave, team outings, group lunches, and an open office in El Segundo.

Compensation: $160K - $190K