Senior Product Engineer (AI, Full-Stack) at AZX

Matcha; Northern (KY); Hybrid; USD 120,000 - 180,000; Full time

Benefits offered by this job

Health insurance

Flexible PTO

Equity

Bonus eligibility

Fully remote culture

Job summary

AZX is seeking a Product Engineer to own client demos from schema to pixel, including deployment and observability. You will work across chat surfaces, agent workspaces, and the app builder, collaborating with platform and design systems teams.

Enterprise readiness, accessibility, localization, and audit trails are core, not afterthoughts. You’ll own front‑end TypeScript, Node/FastAPI backend‑for‑frontend, Postgres schemas, deployment, and on‑call responsibilities.

Qualifications

• 5+ years of production experience with React/TypeScript, streaming UIs and high‑frequency updates.
• Hands‑on streaming protocol end to end (SSE or WebSocket) including debugging raw byte streams.
• True full‑stack ownership: shipped backend for front ends with auth, idempotency, pagination, race conditions, migrations.
• Enterprise‑grade accessibility and localization beyond a strings file.
• AI‑native working style with concrete examples of tool use and overrides.

Responsibilities

• Own the demo stack from schema to pixel, including deployment and observability.
• Collaborate with platform app builder, test sandbox, and design system to ensure consistency.
• Maintain chat surfaces, agent workspaces, and tool integrations across front and back ends.
• Develop the agent‑facing developer experience—CLI, deploy tooling, and manifests.
• Read backend traces and logs to debug issues across product, backend, and platform teams.

Skills

React/TypeScript

Streaming UI

Full-stack ownership

Accessibility

Localization

AI tooling experience

Instrumentation/Observability

TypeScript (strict)

SSE/WebSocket

Education

Bachelor's Degree

Master's preferred

Tools

Node/Fastify

Python/FastAPI

PostgreSQL

Redis

Vite

SSE/WebSocket

OIDC/OAuth2

Playwright

Vitest

Job description

About AZX

Our mission is to accelerate positive impact in critical industries through AI transformation. We specialize in physics-informed ML and enterprise AI solutions that directly address climate and sustainability challenges.

We’re growing quickly and already work with category-leaders in real estate (CBRE), energy (LevelTen Energy), logistics (Flexe) and utilities.

We’re a public benefit corporation, founded in 2024, and have been profitable from inception.

We work on challenges in clean energy, decarbonization, climate risk, energy systems, and global economics. We’re building our company for long-term success and aim to create the ultimate place to work for those passionate about AI and making a positive impact.

About This Role:

We are seeking a Product Engineer that owns the demo's we build for clients from the schema to the pixel, the deployment and the observability. You'll work across the chat surface and agent workspaces, the app builder alongside the platform team, and the shared component and design system, plus the agent-facing developer experience — since our platform's users are coding agents as much as humans. Enterprise readiness is a feature here, not an afterthought: accessibility, localization, and audit trails get demoed, not promised. You'll build on the backend team's services and the runtime team's infrastructure, so overlap down the stack is expected.

Responsibilities:

• Build and evolve the chat surface and agent workspaces — streaming protocol on both client and server, message/run persistence, tool-call and approval UX, and citation rendering.
• Partner with the platform team on the app builder: the fixed app template and toolchain it generates against, the preview sandbox seam, and the generation/repair loop UX.
• Maintain the component and design system across chat, workspaces, and the app builder, keeping all three visually and behaviorally consistent.
• Build the agent-facing developer experience — CLI, deploy tooling, manifests — treating coding agents as first‑class platform users alongside humans.
• Own the full stack behind your own features: TypeScript front end, Node/FastAPI backend‑for‑frontend, Postgres schema, deployment, and on‑call.
• Ship enterprise readiness as a first‑class feature — accessibility, localization, and audit trails — demoed working, not described as roadmap.
• Work down the stack when it matters: read backend service traces and runtime/Kubernetes logs to debug across the seam between product, backend, and platform teams.

Core Qualifications:

• 5+ years of deep, production experience with React/TypeScript — streaming UIs, high‑frequency updates, virtualization, and real state management, with informed, hands‑on opinions about React 19.
• Hands‑on experience with a streaming protocol end to end (SSE or WebSocket) — chunk boundaries, reconnection semantics, abort propagation — including having personally debugged a raw byte stream.
• True full‑stack ownership: you've shipped the backend half of your own front ends (Node/Fastify or Python/FastAPI), handling auth, idempotency, pagination, race conditions, and migrations.
• Product taste backed by enterprise experience — accessibility you can defend to a screen‑reader user, thoughtful empty/error states, and localization that goes beyond a strings file.
• An AI‑native working style: daily use of AI coding tools, driven by specs rather than vibes, with concrete examples of where you overrode a tool's output.
• A strong sense of ownership — instrumentation, evals on AI‑dependent behavior, cost awareness, and on‑call are part of “done,” not a later phase.
• Practical depth in some of our core stack — TypeScript (strict), React 19, TanStack Query, Vite, Node/Fastify or Python/FastAPI, Postgres/Redis, and SSE/WebSocket streaming — with a track record of researching into unfamiliar parts of it.
• Familiarity with the surrounding toolchain: zod‑validated wire contracts, sandboxed iframes/CSP/postMessage, Playwright/Vitest, WCAG 2.2 AA, i18n frameworks, and OIDC/OAuth2 session mechanics
• Bachelor's Degree; Master's is a plus

Why AZX!

• Be part of a fast‑growing, profitable, mission‑driven company with industry‑leading clients tackling the massive opportunity of AI transformation in critical industries.
• Competitive early‑stage startup compensation (based on capabilities, experience, and location)
• Bonus eligibility
• Health insurance with meaningful coverage for dependents
• Flexible paid time off
• Equity
• Fully remote culture with a cluster of teammates in Seattle

Additional Information:

• Must be able to travel 2x/year for company summits
• Applicants must be currently authorized to work in the United States on a full‑time basis.
• We are unable to sponsor or take over sponsorship of employment visas at this time.