Senior Full Stack Engineer, AI Platform

Senior Full Stack Engineer, AI Platform

Zark Lab Full-time Remote

About Zark Lab

Zark Lab builds analytical foundation models that deliver real-time intelligence and conversational insights from massive, multi-modal datasets. Our platform processes documents, video, images, and structured data at scale powering enterprise customers across Web3, fintech, and sports. We're a fast-moving team pushing the boundaries of what's possible when you combine advanced AI with large-scale data infrastructure.

The Role

We're looking for a Senior Full Stack Developer with a strong frontend focus who will own the experience layer of our platform from building rich, responsive interfaces to designing the APIs and services that power them.

You'll be the bridge between our AI backend and the people who use it every day. That means crafting interfaces for real-time data exploration, file management, conversational AI, and collaborative workspaces, all while keeping things fast, intuitive, and polished.

What You'll Do

Design and build complex, interactive frontend applications using React, TypeScript, and Next.js with a focus on performance and usability.

Develop and maintain reusable component libraries and design systems that scale across the platform.

Build real-time interfaces for AI-powered features including streaming chat responses, live data tables, and interactive visualizations.

Implement rich file handling experiences: drag-and-drop uploads, media playback, preview rendering, and content browsing across documents, video, images, and datasets.

Architect and build RESTful and WebSocket APIs in Node.js and TypeScript that serve the frontend with low latency and high reliability.

Optimize frontend performance: code splitting, lazy loading, caching strategies, and bundle optimization for fast load times at scale.

Implement authentication, authorization, and workspace-level multi-tenancy across the full stack.

Write clean, tested, production-ready code with CI/CD pipelines and automated testing (unit, integration, e2e).

Work closely with the founding team to shape product direction, UX decisions, and technical architecture.

Ship fast, gather feedback, and iterate. We prototype in days, not months.

What We're Looking For

4+ years of full stack experience with at least 23 years building complex frontend applications.

Expert-level proficiency in React, TypeScript, and modern CSS (Tailwind, CSS Modules, or similar).

Strong experience with Next.js or comparable React frameworks in production.

Solid backend skills in Node.js and TypeScript, building APIs, services, and database integrations.

Experience with real-time data: WebSockets, Server-Sent Events (SSE), or streaming interfaces.

Comfortable with relational databases (PostgreSQL) and writing performant queries.

Understanding of responsive design, accessibility, and cross-browser compatibility.

Experience with cloud deployments (GCP, AWS), Docker, and CI/CD workflows.

Eye for detail. You care about spacing, transitions, loading states, and the small things that separate good UI from great UI.

Bias toward shipping. You prototype fast, iterate based on real usage, and don't over-engineer.

Nice to Have

Experience with ClickHouse or columnar databases for analytical workloads.

Familiarity with video/audio streaming (HLS, adaptive bitrate) and media processing pipelines.

Experience building collaborative or multi-user real-time interfaces.

Background in data visualization (D3, Recharts, or similar charting libraries).

Experience with AI/LLM-powered interfaces: chat UIs, streaming token rendering, tool-use displays.

Contributions to open-source frontend or full stack projects.

Experience at an early-stage startup.

Why Zark Lab

Work directly with the founders on hard, high-impact problems.

Shape the architecture of a platform processing multi-modal data at scale for enterprise customers.

Remote-first culture with a small, sharp team that moves fast.

Competitive compensation with equity in a company at an inflection point.