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Founding Full Stack Software Engineer

mLabs

$170,000 - $225,000
Oct 27, 2025
Los Angeles, CA, US
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MLabs is building fully autonomous AI agents powered by in-house models that can find, exploit, and patch complex vulnerabilities in web applications at massive scale. They are seeking a Founding Full Stack Software Engineer to build and scale the core systems, addressing the speed and scale challenges posed by AI-generated code.

Requirements

  • Strong knowledge of Python, API Design, and Database systems.
  • Deep understanding of AI, particularly LLMs (Large Language Models), including advanced features and software design principles.
  • Understanding of Agentic AI Architectures and experience creating AI Agents.
  • Strong understanding of API design principles and experience building scalable, optimized systems (including microservices and distributed systems knowledge).
  • Experience post-training and serving LLM models.
  • Experience in Cybersecurity, understanding of web vulnerabilities, and working with security tools (Not required).
  • Experience using AI tools like Cursor to improve development speed and quality.

Responsibilities

  • Design and develop modular, reusable features primarily in Python.
  • Build robust backend services via RESTful APIs and maintain complex features with a focus on performance and scalability.
  • Design and create APIs in Python specifically powering our AI Agents.
  • Build Agentic AI systems and the infrastructure to power agents for cybersecurity tasks.
  • Analyze and identify bottlenecks in the backend codebase, implementing solutions to optimize application performance.
  • Build and design microservices and distributed systems (using tools like Docker and Kubernetes).
  • Design efficient database systems and ensure strong proficiency and efficiency with Postgres SQL.

Other

  • 1-5 years of experience as a software engineer at a notable company (e.g., big tech, YC startup).
  • Bachelor’s or Master’s degree in Computer Science or a related field.
  • Strong communication and collaboration skills, with experience working in cross-functional teams.
  • 100% On-site work, 5 days per week, in the Santa Monica, Los Angeles, CA office.
  • Relocation support is available for candidates moving to the LA area.
  • No visa sponsorship is available for this position.