Principal software engineer Jobs in Glendale, CA

We are seeking a Principal Frontend Engineer to be a technical pillar for our product engineering team. In this role, you will take ownership of the architectural vision and technical strategy for the Ion Factory OS frontend, directly impacting manufacturers building humanity's most ambitious products—eVTOLs, rockets, robots, and more.

As a technical leader, you will not only solve our most complex frontend challenges but also mentor a talented team of engineers, elevating the quality of our user experience and establishing the patterns that will scale our platform for years to come. This is a unique opportunity to shape a product that is critical to companies tackling society’s greatest challenges, from climate change and space exploration to autonomous transportation.

What You'll Do

Lead Architectural Strategy : Architect, design, and lead the implementation of a scalable, performant, and maintainable frontend for the Ion Factory OS, our core manufacturing platform.

Mentor and Elevate the Team : Guide and mentor engineers through complex technical challenges, insightful code reviews, and architectural discussions, fostering a culture of engineering excellence.

Drive Technical Decisions : Make high-impact decisions on our frontend technology stack, including state management (e.g., Apollo Client, Urql), component libraries, testing frameworks, and build pipelines.

Build for Scale and Performance : Architect and implement reusable, resilient React components and JavaScript libraries, optimizing them for maximum performance and real-time data updates across a multi-tenant SaaS environment.

Champion Best Practices : Establish and evangelize best practices for software architecture, testing, documentation, and operational excellence across the engineering organization.

Collaborate Cross-Functionally : Partner closely with product management, UX / UI design, and backend engineering to translate product specifications and complex user workflows into elegant, robust, and intuitive user-facing features.

Own the Technical Roadmap : Define and drive the long-term technical roadmap for the frontend, identifying opportunities for innovation, refactoring, and performance improvements to ensure our platform remains best-in-class.

What You'll Bring (Minimum Qualifications)

8+ years of professional experience in frontend software development, with a proven track record of shipping complex, large-scale web applications.

Expert-level proficiency in modern JavaScript / TypeScript and React, with a deep understanding of its core principles, hooks, and ecosystem.

Significant experience designing, building, and consuming complex GraphQL APIs.

Demonstrated experience in a technical leadership or mentorship capacity, with a passion for growing the skills of fellow engineers.

Strong architectural skills, with experience building and maintaining scalable frontend systems in a SaaS, multi-tenant environment.

Proficiency with modern frontend development tools and pipelines (e.g., Webpack, Babel, NPM) and version control (Git / GitHub).

Experience implementing robust testing strategies across the testing pyramid (unit, integration, e2e) using frameworks like Jest, Cypress, or CodeceptJS.

Familiarity with modern authorization mechanisms, such as JSON Web Tokens (JWT).

Bonus Points (Preferred Qualifications)

Experience architecting, building, and leading the adoption of a comprehensive UI design system.

Deep expertise with GraphQL clients such as Apollo Client or Urql.

Experience with advanced architectural patterns like micro-frontends.

Professional experience working directly with product design and UI / UX experts to build enterprise-grade applications.

Familiarity with data visualization libraries (e.g., D3.js) or real-time communication technologies (e.g., WebSockets).

Experience with Agile development methodologies and tools.

Benefits & Perks

Health Insurance; medical, vision, dental, & life insurance

Unlimited PTO

Paid Parental Leave

Employee Compensation and Stock Option Plan

Team outings, group lunches, an open office, happy hours

Paid holidays, sick days

Flexible work schedule (Hybrid Available)

401K

First Resonance is an equal opportunity employer dedicated to building an inclusive and diverse workforce.

First Resonance participates in E-Verify. As part of our onboarding process, a new hire's Form I-9 information will be shared with the federal government to confirm they are authorized to work in the U.S.

Pay is based on factors such as (but not limited to) scope and responsibilities of the position, candidate's work experience and skillset, and location. Certain roles may be eligible for incentive compensation, equity and benefits.

Pay Range

$170,000—$200,000 USD

First Resonance accelerates the speed and reliability of hardware development for companies manufacturing the next generation of hardware products. This includes electric airplanes, autonomous vehicles, robotics, and more. We are a group of software, hardware, and manufacturing engineers that are bringing the best of modern UX and data science to an industry that has been overly rigid in its innovation. We are removing the barriers preventing radical advancement by providing tools to manufacturing engineers and operators to move information more freely, collaborate with their teams more easily, and use the power of data to predict problems and provide insights that result in better hardware quality and delivery.