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Fullstack Engineer - Intelligent Agents & Systems

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Zyphra

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Location:
United States , Palo Alto

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Category:
IT - Software Development

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Contract Type:
Not provided

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Salary:

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Job Description:

As a Fullstack Engineer, you will be a core contributor to Zyphra’s Agentic Systems and Interaction projects. You will be at the forefront of building a next-generation desktop and browser-based agent (end to end) that can autonomously navigate the web, interact with filesystems, and complete complex user tasks. This role spans frontend interfaces, secure sandboxing environments, large-scale document search and retrieval, and language/vision model integration.

Job Responsibility:

  • Design and implementation of different agentic system designs capable of interacting with browsers, operating systems, enterprise filesystems, collaborations tools among others
  • Building search and retrieval pipelines across large-scale structured and unstructured data
  • Build the backend layer for RAG systems and other information context management systems required for agents to operate
  • Integrating LLMs, vision models, reinforcement learning, and scaffolding frameworks for autonomous, multi-step decision-making
  • Engineering secure virtualized runtimes and backend services for agent execution

Requirements:

  • Proficiency in Python and a deep understanding of building and debugging complex end-to-end applications
  • Experience working with SaaS environment and production workloads, web interfaces, databases, search engines and queuing systems
  • Experience developing browser extensions or automation tools with fine-grained control over the browser (mouse, tabs, DOM)
  • Understanding of LLMs, prompting techniques, and orchestration frameworks for multi-step reasoning
  • Ability to work across the whole stack from web interfaces to control plane and data infrastructure like queuing systems, databases and search indexes.
  • Experience designing or working with secure and virtualized execution environments
  • Excellent communication and collaboration skills across product, research, and engineering teams

Nice to have:

  • Experience building or integrating retrieval-augmented generation (RAG) systems
  • Experience working with enterprise security and compliance frameworks (e.g., SOC 2)
  • Familiarity with vector databases and large-scale document indexing
  • Knowledge of web automation tools and headless browser environments (e.g, Puppeteer, Playwright)
  • Understanding of sandboxed or containerized compute environments with strict access controls
  • Comfort designing user-facing agentic workflows and reasoning systems that span multiple modalities (text, vision, actions)
  • Experience using and fine-tuning models for screen reading, OCR, or UI understanding
  • Background in HCI or interest in building intuitive agent interfaces that extend human capabilities
  • Machine Learning experience as double bonus
What we offer:
  • Comprehensive medical, dental, vision, and FSA plans
  • Competitive compensation and 401(k)
  • Relocation and immigration support on a case-by-case basis
  • On-site meals prepared by a dedicated culinary team
  • Thursday Happy Hours

Additional Information:

Job Posted:
January 13, 2026

Employment Type:
Fulltime
Work Type:
On-site work
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