About the posting
“We are looking for engineers who leverage AI coding tools to build end-to-end features with unprecedented speed and quality.”
Read the full posting on First Resonance's site
Seen live Oct 23, 2026; first seen Oct 22, 2026.
Pay in context
This posting lists $160,000 to $190,000 a year, a midpoint of $175,000.
The midpoint is higher than 45 percent of software engineering postings in Los Angeles, CA that list pay.
California has a pay transparency law: covered employers must include a pay range in a job posting. Which employers are covered depends on their size.
How long it has been open
Posted Feb 21, 2026, 245 days ago, and seen on First Resonance's careers page today.
At 245 days old, it is over the 65-day median.
First Resonance at a glance
First Resonance has 14 open postings that we can see, 5 in software engineering; 100 percent list pay.
The application
Applying goes through Ashby.
Trailhead fills Greenhouse, Lever and Ashby forms on your computer; on the phone and on other systems it hands you your answers and your resume.
Seniority
Level: senior.
The posting mentions 6+ years.
Place and cost of living
On site in Los Angeles, CA; prices in CA run 11 percent above the US average.
Similar jobs at similar pay
The software engineering market in Los Angeles, CA
210 software engineering postings in Los Angeles, CA are open right now, from 45 employers.
Half of them have been open 65 days or less.
From First Resonance's posting
This is First Resonance's own text, as published on its job board. We last checked it on Oct 23, 2026. Apply on First Resonance's site. We remove a posting when the employer closes it.
Apply on First Resonance's site
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.