Senior Full Stack Typescript Developer Jobs in California

SENIOR FULL STACK ENGINEER

Overview

We are seeking Senior Full Stack Engineers to shape the core of a rapidly scaling AI voice automation platform. This is a high-impact role where you'll build scalable systems and intuitive interfaces that power millions of AI-driven conversations. Work closely with the founding team, bridging backend architecture with frontend experiences while driving category-leading product innovation. This is for engineers who thrive in fast-paced environments with real customer exposure and the ability to directly impact product direction.

About the Role

This is a true full stack position working across React, TypeScript, and Node.js—delivering fast, high-quality, production-level solutions. You'll own projects end-to-end: from architecture and build through deployment and iteration. You'll bridge backend complexity (prompt orchestration, telephony integrations) with intuitive frontend experiences (dashboards, analytics tools). There's a strong focus on building seamless customer onboarding and genuinely impactful user experiences.

This role offers fast feedback loops, direct customer exposure, and the chance to help define a category-leading product. It's the kind of position where strong engineers thrive and leave their mark.

Key Responsibilities

Core Feature Development:

• Build core platform features including prompt orchestration, dashboards, analytics, and telephony integrations

• Develop scalable full stack systems spanning UI through to APIs and DevOps

• Own projects end-to-end: architecture, implementation, deployment, and iteration

• Create intuitive interfaces and APIs that allow customers to get live quickly

• Support seamless customer onboarding and troubleshoot issues in production

System Architecture & Scalability:

• Design and build systems that support millions of AI-driven conversations

• Optimize for performance, reliability, and user experience at scale

• Build resilient APIs and backend services that handle real-time telephony and conversation data

• Implement efficient data pipelines and analytics infrastructure

Customer Impact & Feedback:

• Work directly with customers to understand pain points and opportunities

• Translate customer feedback into product improvements

• Support onboarding and provide technical guidance to customers

• Feed real-world insights back into product strategy and roadmap

Requirements

Experience (Required):

• 5–8+ years of professional full stack engineering experience

• Deep proficiency in React and TypeScript with ability to architect complex, data-intensive frontend applications

• Strong command of Node.js for backend services and advanced JavaScript for full stack development

• Experience with Python for backend services and scripting

• Proven track record building and shipping production systems at scale

• Experience with AWS (Lambda, EC2, databases, storage, etc.)

• Demonstrated ability to own projects end-to-end in fast-moving environments

• Strong systems thinking and ability to make sound architectural decisions

Mindset & Culture Fit (Required):

• Bias for action: prefers shipping over over-engineering

• High ownership mentality: comfortable taking full responsibility for outcomes

• Fast execution: thrives in high-intensity, rapidly-changing environments

• Customer-focused: genuinely excited about understanding and solving real customer problems

• Collaborative: works well with founding teams and cross-functional partners

• Self-starter: capable of identifying problems and driving solutions independently

Tech Stack

• Frontend: React, JavaScript/TypeScript, modern CSS

• Backend: Node.js, JavaScript/TypeScript, Python

• Infrastructure: AWS (Lambda, EC2, RDS, S3, etc.)

• Databases: PostgreSQL, Redis, or similar

• DevOps: Docker, CI/CD, Infrastructure-as-Code

• Tooling: Git, modern development workflows

Work Details

• Location: Redwood City, California

• Work Policy: 5 days per week on-site (non-negotiable)

• Employment Type: Full-Time, Direct Hire

• Remote Status: No Remote

• Positions Available: 2 hires planned

• Visa Sponsorship: Available (not open to net new H-1Bs; H-1B transfers and other visa types welcome)

Compensation

• Base Salary: $215,000 – $290,000 (based on experience)

• Equity: Extremely competitive package

• Benefits: Comprehensive (health, dental, vision, 401k, etc.)

Why This Role & Company

High-Impact Ownership:

This is not a task-based role. You own entire features and systems from conception through deployment. Your decisions directly shape the product and company direction.

Category-Leading Product:

Work on an AI voice automation platform at a pivotal moment. The founding team is building something genuinely new, and you'll help define how the category evolves.

Real Customer Exposure:

Customers depend on what you build. You'll get direct feedback on your work and see immediate impact from your contributions.

Fast Feedback Loops:

In a lean, fast-moving environment, you'll ship code daily and iterate based on real customer usage. No lengthy approval processes or bureaucracy.

Founding Team Collaboration:

Work closely with the founding team in a tight-knit, high-trust environment. Your technical judgment shapes architecture, and your ideas have real influence.

Scalability Challenge:

Build systems powering millions of conversations. Complex, impactful engineering problems across full stack.

Competitive Compensation:

Strong base salary and extremely competitive equity—the kind of package that reflects real ownership and upside potential.

This is the kind of role where strong engineers leave their mark.

Who Should Apply

Strong engineers who thrive on high ownership and fast execution

Full stack engineers who genuinely enjoy bridging backend complexity and frontend elegance

People excited by building from scratch and being close to product and customer impact

Engineers who prefer fast-moving startups over slower-paced environments

People willing to be on-site, fully committed to the team dynamic

Not for engineers seeking remote work or flexibility

Not for people uncomfortable with intensity or rapid change

Not for engineers who prefer narrow scopes or well-defined tickets

Not for those looking for a slower pace