Fullstack Engineer

Krea; San Francisco, Northern (CA, KY); Hybrid; USD 180,000 - 260,000; Full time

Benefits offered by this job

Health & dental coverage

401k with company match

Meals in office

Transit covered

Visa sponsorship

Job summary

Krea, based in San Francisco, seeks a strong frontend/full-stack JS/TS engineer to build next‑gen AI creative tooling. You will implement APIs and UI flows using SvelteKit, design responsive, interactive experiences, and optimize performance with real-time WebSocket streams.

The role involves backend work (Node, Postgres, Redis) and driving public API initiatives to serve Krea AI models to millions of developers.

Qualifications

• Solid full-stack JS/TS engineer with frontend focus
• Experience with SvelteKit or similar frameworks, real-time UI via WebSockets
• Comfortable designing APIs, database schemas, caching strategies
• Familiar with infra and scale: Kubernetes, Postgres, Redis, observability stacks

Responsibilities

• Build and maintain APIs and UI flows for web + mobile in Svelte/SvelteKit, TypeScript
• Design interactive, responsive front-end experiences—drag-and-drop, real-time canvas polish, smooth and responsive UI animations
• Optimize frontend performance: minimize render latency, profile UI with virtual DOM techniques, deliver seamless WebSocket image streams
• Design and maintain backend services (Node), DB models (Postgres + Redis caching/pooling)
• Kickstart a Public API project to serve Krea AI models to millions of developers
• Diagnose HTTP/3 and WebSocket related issues both on the client side and the server side
• Drive real-time image & video generation pipelines via low-latency APIs
• Improve observability and alerting using OpenTelemetry tools
• Implement enterprise features: Audit Logs, SAML/SSO, SCIM provisioning
• Bonus: Scale infra through AWS EKS GPU clusters or Kubernetes operators

Skills

Frontend JS/TS

SvelteKit

WebSockets

API design

Tools

Node.js

TypeScript

PostgreSQL

Redis

Job description

About Krea

At Krea, we are building next-generation AI creative tools.

We're dedicated to making AI intuitive and controllable for creatives - our mission is to build tools that empower human creativity, not replace it. We believe AI is a new medium that allows us to express ourselves through various formats - text, images, video, sound, and even 3D. We're building better, smarter, and more controllable tools to harness this medium. We recently took this a step forward with the launch of Krea 2, our first foundation model, built completely from scratch for aesthetic diversity and stylistic control.

We've raised over $83M and are backed by world-class investors such as a16z, Bain Capital, and Abstract. We work full-time and in-person at our waterfront office in San Francisco. We care about creativity: our team includes musicians, designers, visual artists, and engineers.

Some examples of things you will do:

• Build and maintain APIs and UI flows for web + mobile in Svelte/SvelteKit, TypeScript

• Design interactive, responsive front-end experiences—drag-and-drop, real-time canvas polish, smooth and responsive UI animations

• Optimize frontend performance: minimize render latency, profile UI with virtual DOM techniques, deliver seamless WebSocket image streams

• Design and maintain backend services (Node), DB models (Postgres + Redis caching/pooling)

• Kickstart a Public API project to serve Krea AI models to millions of developers

• Diagnose HTTP/3 and WebSocket related issues both on the client side and the server side

• Drive real-time image & video generation pipelines via low-latency APIs

• Improve observability and alerting using OpenTelemetry tools

• Implement enterprise features: Audit Logs, SAML/SSO, SCIM provisioning

• Bonus: Scale our infra architecture through deep understanding of our AWS EKS GPU clusters or Kubernetes operators

Strong candidates may have experience with the following:

• Solid full-stack JS/TS engineer with frontend focus—component design, UI state, animations, client performance

• Experience with SvelteKit or similar frameworks, real-time UI via WebSockets

• Comfortable designing APIs, database schemas, caching strategies

• Familiar with infra and scale: Kubernetes, Postgres, Redis, observability stacks

• Side projects or open‑source contributions in UI/infra are plus

• Bonus: prior work on enterprise auth features, GPU workloads, ML or image/video pipelines

Stack:

• Frontend: Svelte/SvelteKit

• Backend: Node + TypeScript, Postgres, Redis

• Realtime: WebSockets, HTTP/3

• Infra: AWS EKS GPU clusters, Kubernetes

• Observability: Prometheus, OpenTelemetry, Axiom/HyperDX

• Tools: GitHub, Slack, Notion

What we offer

• Team: Work alongside a world-class team building the future of AI creative tooling

• Impact: Significant scope and company-wide impact

• Competitive compensation: generous salary & equity packages

• Health & wellness: 100% health & 99% dental/vision insurance premiums covered for employees, health FSA accounts, & long-term disability coverage

• Time off: Flexible PTO policy

• Financial planning: 401k with a 4% company-sponsored match

• Meals in the office: breakfast, lunch, dinner - you name it, we'll cover it

• Transit: Ubers covered to & from the office

• Sponsorship: We're open to sponsoring international visas where we can (e.g., STEM OPT, OPT, H-1B, O-1, E-3).

• And more!

Please note the above benefits & perks are for full-time employees