Fulcrum

Senior FullStack Engineer – AI-First

Fulcrum

full-time

Posted on:

Location Type: Remote

Location: Ukraine

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Job Level

Senior

Tech Stack

DockerJavaScriptNode.jsNoSQLReactRedisTypeScript

About the role

  • Design and develop core product functionality for an AI-powered platform with autonomous agents
  • Build and improve the agent runtime that allows AI agents to execute tasks, interact with tools, and run in isolated environments
  • Develop chat-based and conversational interfaces that enable users to interact naturally with their AI agents
  • Implement and evolve the memory system that allows agents to learn from conversations and store long-term context
  • Design and build APIs and backend services powering agents, integrations, and real-time features
  • Work with vector databases and RAG pipelines to support intelligent retrieval and context building
  • Build real-time experiences (streaming responses, live updates) for interactive agent execution
  • Participate in building the multi-agent orchestration layer, enabling collaboration between multiple AI agents
  • Contribute to the AI tool ecosystem, integrating external services and building extensible agent skills
  • Collaborate with product, design, and engineering teams to iterate quickly and deliver new features

Requirements

  • 3+ years of experience with JavaScript / TypeScript
  • Strong experience with React (React 18+) and Node.js
  • Experience building applications with Server-Side Rendering (SSR)
  • Experience developing REST APIs
  • Experience integrating LLM APIs (OpenAI, Anthropic, or similar)
  • Experience working with databases (experience with SurrealDB or similar NoSQL databases is a plus)
  • Experience with Redis or streaming systems (e.g., Redis Streams), also Docker and containerized environments
  • Experience with Git-based workflows and CI/CD pipelines
  • Understanding of basic security principles in web applications
  • Ability to work in an AI-powered development workflow (using modern AI tools in development), with AI agents / agentic systems
  • Experience with Own Agent Building
Benefits
  • Flexible schedule & opportunity to work remotely or workspace in Kyiv
  • Friendly & open team who have fun creating cool projects together
  • Opportunity to boost your professional & personal growth
  • Regular team gathering activities
  • 20 business days of paid vacation + UA national holidays
  • Medical insurance full coverage
  • 10 + 5 days paid sick leave
Applicant Tracking System Keywords

Tip: use these terms in your resume and cover letter to boost ATS matches.

Hard Skills & Tools
JavaScriptTypeScriptReactNode.jsServer-Side RenderingREST APIsLLM APIsNoSQL databasesRedisDocker
Soft Skills
collaborationiterationcommunication