Fullstack Engineer - Intelligent Agents & Systems
Zyphra is an artificial intelligence company based in San Francisco, California.
The Role:
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. We encourage all candidates to apply, even if they don't gather all the requirements.
You’ll work across:
Design and implementation of different agentic system designs capable of interacting with browsers, operating systems, enterprise filesystems, collaboration 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
What matters most is your drive to build production-grade software
We value velocity and curiosity, especially in fast-moving and ambiguous environments
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
Bonus Qualifications:
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 a double bonus
Why Work at Zyphra:
Our research methodology is grounded in methodical, step-by-step approaches to ambitious goals. Both deep research and engineering excellence are equally valued
We strongly value new and crazy ideas and are very willing to bet big on new ideas
We move as quickly as we can; we aim to minimize the bar to impact as low as possible
We all enjoy what we do and love discussing AI
Benefits and Perks:
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
In-person team in San Francisco, California with a collaborative, high-energy environment