Frontend Engineer (Js, TypeScript)

About The Company SIFT is at the forefront of redefining how modern machines are built, tested, and operated. Our innovative platform provides engineers with real-time observability over high-frequency telemetry, eliminating bottlenecks and enabling faster, more reliable development cycles.

Born from pioneering work at SpaceX on projects such as Dragon, Falcon, Starlink, and Starship, SIFT addresses the critical need for scalable telemetry, robust debugging, and mission assurance infrastructure. Founded by a team with backgrounds from SpaceX, Google, and Palantir, our company is dedicated to supporting mission-critical systems where precision, scalability, and reliability are non-negotiable. Our culture emphasizes solving complex engineering problems, fostering innovation, and building foundational systems that empower the next generation of advanced machines.

About The Role As a key member of our engineering team, you will be instrumental in designing and optimizing data pipelines that operate entirely within the browser environment. Your work will involve developing high-performance web components such as Web Workers processing Apache Arrow binary data, implementing persistent caching strategies within the Origin Private File System, and devising multi-layer invalidation mechanisms to ensure UI responsiveness amidst large datasets.

You will build sophisticated interactive visualizations including time-series telemetry, FFT frequency analysis, geographic mapping, and scatter plots, each demanding high accuracy and performance. Your expertise will help solve performance bottlenecks that typical frameworks cannot address, such as bypassing React’s render cycle for smooth 60fps interactions, coordinating worker thread pools, and managing memory across large binary buffers. Additionally, you will architect composable UI systems tailored for technical users requiring full data fidelity, working across the stack boundary and collaborating with backend engineers on API design, binary serialization formats, and structured data query semantics.

This role offers an exciting opportunity to influence the architecture, shape product development, and contribute to a culture focused on solving real engineering challenges in mission-critical environments.

Qualifications

• 7+ years of experience developing software for the web, with a focus on performance optimization and platform deep-dives.

• Strong expertise in TypeScript and experience working within React codebases.

• Deep understanding of system-level concepts including memory layout, thread coordination, caching strategies, and data serialization formats.

• Proven track record of building software where correctness and data fidelity are critical under constraints.

• Experience with binary data processing, GPU rendering, and multi-threaded architectures.

• Familiarity with browser threading and storage APIs such as Web Workers, SharedArrayBuffer, and OPFS.

• Experience working on infrastructure projects like custom caching layers, data pipelines, rendering engines, or developer tools.

• Background in domains with non-negotiable data correctness, such as aerospace, scientific computing, medical devices, or financial systems.

Responsibilities

• Design and optimize in-browser data processing pipelines utilizing Web Workers, Apache Arrow, and persistent caching mechanisms.

• Develop and refine interactive visualizations for telemetry data, including time-series, FFT analysis, geographic maps, and scatter plots, ensuring high performance and accuracy.

• Identify and resolve performance bottlenecks by bypassing framework limitations, coordinating worker threads, and managing memory efficiently.

• Architect and implement composable, data-fidelity-focused UI systems tailored for technical users.

• Collaborate closely with backend teams on API design, binary serialization formats, and structured data query semantics.

• Contribute to the evolution of our platform, influencing architecture, product features, and engineering culture.

• Maintain a focus on correctness, performance, and scalability in all development efforts.

Benefits

• Competitive salary range of $200,000 - $250,000 per year.

• Equity options to share in the company's growth and success.

• Comprehensive benefits package including health, dental, and vision insurance.

• Flexible work arrangements, including remote work options for qualified candidates.

• Collaborative and innovative work environment with opportunities for professional growth.

• Regular in-person team collaborations in Marina del Rey, CA, with a flexible schedule to foster teamwork and company culture.

Equal Opportunity
SIFT is an equal opportun