Full Stack Engineer, Spark

Lightspark

full-time

Posted on: 9/7/2025

Location: California • 🇺🇸 United States

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💰 $170,000 - $200,000 per year

Mid-LevelSenior

GoJavaScriptKotlinReactReact NativeRuby on RailsSparkTypeScript

About the role

Design, build, and maintain SDKs used by partners to integrate with Spark’s backend services
Work across multiple languages and platforms, primarily JavaScript/TypeScript, and expand to Kotlin, Go, and others
Build core functionality and developer tools for high-volume enterprise customers
Collaborate with engineers, product managers, and partner teams to deliver reliable, high-quality software
Ensure SDKs are well-tested, well-documented, and easy for developers to adopt
Contribute to architecture and design of new features with scalability and performance in mind
Adapt quickly to new technologies, languages, and requirements as the product evolves
Maintain a high bar for engineering excellence in a fast-paced, collaborative environment

3+ years of fullstack engineering experience
Strong experience with JavaScript/TypeScript
Willingness and ability to work across multiple languages (e.g., Kotlin, Go)
Experience building SDKs, APIs, or developer tools is a plus
Experience with React Native and/or mobile development is a plus
Crypto, fintech, or side project experience is a plus
Proven ability to work independently and deliver high-quality results under tight timelines
Adaptability and resourcefulness in solving problems across unfamiliar tech stacks
Strong collaboration skills and a proactive approach to driving initiatives forward
Bachelor's degree in Computer Science, or equivalent is a plus but not required
Living in, or willing to relocate, to Los Angeles, CA
Must be legally authorized to work in the United States (applicant form asks)