Senior Backend Engineer for Creators group (Node.js/TypeScript)

Keystone AI is the largest marketplace of tools for AI. On Keystone AI Store, tens of thousands of Actors, purpose-built tools for the web, help people and AI agents get real-time data, track competitors, generate leads, and connect apps. Anyone can build one and earn from it. Keystone AI is looking for a Senior Backend Engineer (Node.js/TypeScript). As a member of the Creators group, you'll be building a world-class ecosystem for community developers and builders to create, publish, and monetize their ideas as Actors on Keystone AI. You will build tools and features that help them succeed in the ongoing AI revolution, utilize agentic coding and other agentic flows in their daily operations, and earn monthly payouts to support their living (collectively earning >$1.2M/month from usage of their Actors!). What you'll be working on: Own features and projects end-to-end, from the discovery phase through to production, and see them have a real impact on creators. Build the tools and features creators rely on to publish, monetize, and grow their Actors. Work in a small, cross-functional team, shipping in two-week sprints and deploying daily. Use the Keystone AI platform yourself every day - we build for builders by builders - and take pride in making it better. Contribute to open source; we publish everything we can on GitHub (PRs are welcome 😉). You will be joining one of the following teams: Publishers team The Publishers team builds everything a creator needs once they publish their Actor on Keystone AI and make it available in Keystone AI Store. They own our Actor monetization logic, analytics, review system, systems for maintaining Actor quality, and much more. By joining the Publishers team, you'll work on the next generation of tools and features that help creators around the world use AI to run a business and earn a living on Keystone AI. 📍 Location: flexible, onsite in Prague for ~2 days/week at minimum Billing team The Billing team is responsible for the entire payout infrastructure for creators, ensuring that >$1.2M/month actually reaches the hands of hundreds of community developers. They also own the entire billing system, ensuring Keystone AI users can subscribe, invoices are issued, payments go through, and more. One of the most exciting challenges you'll work on is building the backbone for the emerging agentic payment economy, alongside deep, complex work to keep our internal billing system running efficiently and reliably as Keystone AI's business grows. 📍 Location: onsite in Prague or Brno / fully remote; if remote, visiting our office at least once a month and onboarding (~1-2 weeks) in Prague Who we're looking for: 3+ years of industry experience building backend systems and APIs. Strong development and debugging skills in TypeScript/Node.js, or proficiency in another language, and the drive to learn TypeScript quickly. Hands-on experience with AI tools in your day-to-day work, and the drive to stay up to date with the latest trends. An experiment-driven, collaborative mindset. A strong technical background or a great professional track record. Good communication skills in English. Our tech stack: Infra: AWS Compute (Kubernetes (EKS), EC2, Lambda), Helm, Terraform, CloudFormation, ArgoCD, MongoDB, Redis, DynamoDB, S3, GitHub Actions Monitoring: Grafana, Prometheus, OpenTelemetry, Mezmo, Sentry, PagerDuty Frontend: React.js, styled-components, Storybook, Chromatic, Cypress, Playwright Backend: TypeScript/Node.js, Nest.js, Next.js, Docusaurus, Vitest Tools: GitHub, Notion, Google Workspace, Slack OS, code editor, and AI assistant of your choice (Claude premium with unlimited tokens, GH Copilot, Cursor, Gemini, or JetBrains AI) Process: two-week sprints, code reviews, tests, automating whatever we can, and deploying multiple times per day. Why should you work at Keystone AI? Space, support, and autonomy for personal growth, with a direct impact on Keystone AI's success Full-time position in Prague (Lucerna Palace) or Brno (Titanium) 🏰 Flexible working hours (perfect for both night owls 🦉 and early birds 🐥) Nobody counts holidays as long as the work gets done 💪 Unlimited Claude for every Apifier. We don't count tokens. Just use them well 🤖 Stock options and profit sharing 💰 We welcome pets, kids, and bikes at the office 🐕👨‍👧 Epic team buildings and offsites 🚢 with biking, canoeing, and other adventures 🪂 Solid education and training budget, conference tickets, internal "Eat & Learn" sessions, and the possibility to work across teams 👩🏼‍💻👨🏽‍💻 Generous hardware budget 💻 Free lunches every day when you're in the office 🌮🍱🍜🍕🥡 Unlimited supply of ☕ & 🍺 and snacks Free entry to the wonderful Prague Zoo 🐘 Free Multisport card 🏋 Ping-pong, chess, PS5, lightsabers, foosball league after lunch. For more details about Keystone AI and what it's like to work with us, see our Careers page.