AI Founding Software Engineer - Full Stack Job at twentyAI, San Mateo, CA

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  • twentyAI
  • San Mateo, CA

Job Description

AI Founding Software Engineer (Full Stack) – Join a High-Impact Startup!

Location: San Francisco (3 days onsite)

Employment Type: Full-time, Salaried + Bonus + Equity

About the Role

Are you an ambitious full-stack engineer looking to make a significant impact in the AI space? Join our fast-growing startup as a Founding Software Engineer and help us build an AI-powered voice agent platform that’s revolutionizing call automation. You'll take ownership of core technical projects, build scalable systems, and shape the future of voice AI!

What You’ll Do

  • Architect, develop, and maintain high-performance systems for real-time AI-driven call processing.
  • Guide junior engineers and establish best practices for a top-tier engineering culture.
  • Design APIs, microservices, and data pipelines that power our cutting-edge AI platform.
  • Work closely with product managers, designers, and cross-functional teams to deliver impactful features.
  • Continuously enhance system performance, security, and reliability to support our growing customer base.
  • Provide direct technical support when needed and collaborate with sales and customer success teams to ensure smooth onboarding.

What We’re Looking For

  • 1+ years in full-stack or backend development.
  • Strong programming skills in Python, JavaScript, TypeScript, or Go.
  • Familiarity with AWS, GCP, or Azure, plus experience with Docker & Kubernetes.
  • Proficiency in SQL & NoSQL databases with a focus on efficient data models.
  • Ability to debug complex issues and optimize system performance.
  • A founder-like mindset with autonomy in decision-making.
  • Excellent communication skills and adaptability in a fast-paced environment.

Bonus Points

  • Startup experience or working in a fast-growing company.
  • Background in AI, NLP, speech recognition, or call automation.
  • Strong frontend skills in React, Next.js, or modern frameworks.
  • Experience managing cloud infrastructure, CI/CD, and DevOps best practices.

Why Join Us?

  • Work on game-changing AI technology.
  • Be a key player in shaping our product, culture, and technical direction.
  • Competitive salary, equity, and top-tier benefits (healthcare, meals, gym reimbursements).
  • Own high-impact projects and grow with a well-funded, fast-scaling startup.

Join us and help shape the future of AI-powered automation!

Job Tags

Full time,

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