Software Engineer, Frontend (Agentic AI)

Telemetry Today LLC; San Francisco (CA); On-site; USD 160,000 - 200,000; Full time

Benefits offered by this job

Equity

Job summary

Sift is seeking a frontend-focused software engineer to own and evolve agentic UX across high-performance web apps. You will partner with product and customers to translate review workflows into actionable agent capabilities, building dashboards, analysis tooling, and fast interfaces.

You’ll ship polished interfaces, collaborate on API design, and contribute to a cohesive design system as Sift scales its telemetry-driven platform.

Qualifications

• 3+ years of professional software engineering experience.
• Enjoy owning a product area: talk to customers, decide what to build, and ship.
• Built complex, high-performance web apps with React/NextJS/TypeScript or similar.
• Attention to micro-interactions, latency, and polish in UX.

Responsibilities

• Build frontend surfaces where Sift Agents live and ensure a great UX.
• Collaborate with backend and full-stack engineers on API design for agent sessions.
• Render agent findings alongside telemetry data for trust and speed.
• Talk directly to customers and partner with product to turn workflows into agent capabilities.
• Contribute to component library to keep UI patterns consistent.

Skills

Product ownership

Customer collaboration

Frontend engineering

Web performance

Attention to detail

AI product curiosity

Tools

React

NextJS

TypeScript

Tailwind

Redux

WebAssembly

D3.js

WebGL

Go

GitHub Actions

AWS

Docker

Kubernetes

Terraform

Job description

Sift is the data infrastructure platform for hardware engineering teams. We turn high-frequency telemetry into engineering insights for mission-critical machines: rockets, satellites, autonomous vehicles, energy systems, and defense platforms. Founded by former SpaceX engineers, we are building the review and analysis layer for the AI era of physical systems.

About The Role:

Hardware programs generate far more telemetry than any team can review by hand. Sift Agents is our answer: AI agents that work alongside hardware engineers, investigating anomalies, reviewing test and flight data, and answering in minutes questions that used to take a day of scripting.

This role comes with real product ownership and autonomy. You will talk directly to customers to understand how they review their machines, decide what to build, and own it from first MVP through every iteration after it ships. The surface area is wide: one day you might be polishing the micro-interactions that make the chat experience feel great, the next you might be building a bespoke caching layer for the chat messages off the main JS thread. We’re heavy users of frontier agentic products ourselves and have strong opinions about what makes them great. Sift Agents is where we put those opinions to work.

Talk directly to customers and partner with product to turn real review workflows into agent capabilities: generating dashboards, writing analysis scripts, and surfacing insights buried in their telemetry

Build the frontend surfaces where Sift Agents live, and make them feel great

Design the interaction patterns of agentic UX: streaming responses, long-running tasks, interruptions, and showing an agent's work so engineers can trust it

Render an agent's findings alongside the telemetry that backs them, and keep it fast even when the data is large

Contribute to the component library to keep agentic UI patterns consistent across the product

Collaborate with backend and full stack engineers on the API design that powers agent sessions

The Skillset You'll Bring:

3+ years of professional software engineering experience

Get excited about owning a product area: talking to customers, deciding what to build, and shipping it

Have built complex, high-performance web applications with technologies like React, NextJS, TypeScript, or similar

Have an eye for detail: you notice the micro-interactions, latency, drops in FPS, and polish that separate good interfaces from exceptional ones

Are curious about new AI products: you try new agents, models, and features as they ship, and have opinions about what makes them good

Bonus Points:

Shipped products to users at scale: large data volumes, significant active user counts, or deep technical complexity

Shipped LLM-powered features

Built chat or agentic interfaces: streaming responses, tool-call rendering, long-running tasks

Worked with modern CSS (Tailwind) and component libraries (Radix UI) to build design systems

Used technical visualization tools (WebGL, D3.js, Apache ECharts), WebAssembly, and time-series data

Built tools for technical users (dashboards, data-editing environments)

A personal ecosystem of AI dev tooling: custom agents, skills, scripts, or workflows built to ship faster

A background in scientific computing or hardware test and telemetry

You'll have the opportunity to help evolve and scale our platform because we're still in the early stages of building the product. Relevant technologies include:

Web frontend & backend: React, TypeScript, Redux, Tailwind, WebAssembly, D3.js, WebGL, and Go

Data: Parquet, Flink, Kafka, Redpanda, Beam, DuckDB, Timescale, QuestDB, InfluxDB, and Druid

Infrastructure: GitHub Actions, AWS, Azure, GCP, Docker, Kubernetes, and Terraform

Location:

Sift's headquarters is in Marina Del Rey, CA (Next to LAX). We collaborate in person twice a week - on Mondays and Thursdays - and come together for a full week every two months. We are open to relocating candidates to LA or working from our San Francisco office for the right candidate.

Salary range: $160,000 - $200,000 per year. Plus equity and benefits.

U.S. Person Required: Must be a U.S. citizen, lawful permanent resident, or protected individual such as an asylee or refugee in compliance with ITAR (International Traffic in Arms Regulations) / EAR (Export Administration Regulations) regulations.