Full stack developer Jobs in San Mateo, CA

About the Role

We're hiring Senior Full Stack Engineers to help build and scale a rapidly growing AI voice automation platform powering millions of real-time conversations.

This is a high-impact engineering role where you'll work across the full stack — building scalable backend systems, intuitive frontend experiences, and infrastructure that directly supports production AI workflows used by real customers every day.

You'll collaborate closely with the founding team, own projects end-to-end, and help shape both the technical architecture and product direction of a category-defining platform.

This role is ideal for engineers who thrive in fast-paced startup environments, enjoy high ownership, and want direct visibility into the impact of their work.

About the Company

The company is building a next-generation AI voice automation platform designed to transform customer communication workflows at scale.

The team is operating in a rapid-growth phase with strong customer demand, meaningful production usage, and a highly technical engineering culture focused on speed, execution, and product innovation.

Engineers here work closely with customers, ship quickly, and have meaningful influence over architecture, product direction, and platform scalability.

What You'll Do

Core Platform Development

• Build core platform features including prompt orchestration, dashboards, analytics, and telephony integrations
• Develop scalable full stack systems spanning frontend applications, APIs, backend services, and infrastructure
• Own projects end-to-end from architecture and implementation through deployment and iteration
• Build intuitive user interfaces and APIs that improve onboarding and operational workflows
• Support customer onboarding and troubleshoot production issues when needed

Architecture & Scalability

• Design systems capable of supporting millions of AI-driven conversations
• Optimize platform performance, reliability, and scalability
• Build resilient backend services handling real-time telephony and conversation data
• Develop efficient analytics infrastructure and data pipelines

Customer & Product Collaboration

• Work directly with customers to understand operational pain points
• Translate customer feedback into product improvements
• Provide technical guidance and onboarding support
• Influence roadmap and product strategy through real-world usage insights

Required Qualifications

Technical Experience

• 5–8+ years of professional full stack software engineering experience
• Deep expertise with React and TypeScript
• Strong frontend architecture and complex state management experience
• Strong backend engineering experience using Node.js and JavaScript/TypeScript
• Experience with Python for backend services and scripting
• Experience building and shipping production systems at scale
• Experience working with AWS infrastructure including Lambda, EC2, databases, and storage services
• Strong systems-thinking and architectural decision-making skills
• Experience owning projects end-to-end in fast-moving environments

Mindset & Working Style

• Strong bias toward execution and shipping
• High ownership mentality with accountability for outcomes
• Comfortable operating in fast-changing startup environments
• Customer-focused mindset with genuine interest in solving operational problems
• Collaborative approach with founders and cross-functional teams
• Self-starter capable of identifying problems and independently driving solutions

Tech Stack

Frontend

• React
• JavaScript / TypeScript
• Modern CSS

Backend

• Node.js
• JavaScript / TypeScript
• Python

Infrastructure & DevOps

• AWS (Lambda, EC2, RDS, S3)
• Docker
• CI/CD pipelines
• Infrastructure as Code

Databases

• PostgreSQL
• Redis

Work Environment

• Location: Redwood City, California
• Fully onsite, 5 days/week
• Full-time direct hire
• 2 hires planned
• No remote option available

Visa Support

• H-1B transfers supported
• Other visa types considered
• No net-new H-1B sponsorship available

Compensation & Benefits

Compensation

• Base Salary: $215,000 – $290,000 USD
• Extremely competitive equity package

Benefits

• Comprehensive medical, dental, and vision coverage
• 401(k)
• Full benefits package

Why This Role Stands Out

High Ownership

This is not a narrow ticket-taking role. Engineers own systems and features from concept through production deployment with meaningful influence over architecture and execution.

Real Product Impact

You'll work directly on systems customers depend on every day and receive fast feedback from real-world usage.

Fast Execution Environment

The engineering culture emphasizes speed, iteration, and shipping meaningful improvements quickly without unnecessary bureaucracy.

Founding Team Collaboration

You'll work closely with founders and technical leadership in a highly collaborative environment where strong engineering judgment is valued.

Complex Technical Challenges

This role involves building large-scale AI-driven systems across backend infrastructure, frontend experiences, real-time communication systems, and distributed workflows.

Who Should Apply

Engineers who thrive in high-ownership startup environments
Full stack engineers who enjoy both backend systems and frontend product development
Builders excited about AI platforms and real customer impact
Engineers who prefer speed, autonomy, and direct product influence

This Role Is Likely Not a Fit For

Engineers seeking remote flexibility
Candidates uncomfortable with fast-moving startup environments
Engineers preferring narrowly scoped or highly structured work