Senior Fullstack Software Engineer (Backend Emphasis)
We are looking for a senior backend engineer with strong experience in voice systems to help build the infrastructure powering Curio's conversational experiences. The role requires designing, building, and scaling backend systems that enable real-time voice interaction between children and Curio characters. Strong ownership, experience with real-time or streaming systems, and the ability to build scalable, production-grade infrastructure are essential.
Key Highlights
Key Responsibilities
Technical Skills Required
Benefits & Perks
Nice to Have
Job Description
Senior Fullstack Software Engineer (Backend Emphasis)
- Location: Woodside, CA
- Work Model: Onsite 4 days per week at HQ for Bay Area–based employees. For candidates based outside the Bay Area, onsite 1-2 weeks per month.
- Company: Curio
- Employment Type: Full-time
- Visa Sponsorship: Available
About Curio
Curio is built from the ground up with privacy and security at its core — a place where toys and interactive experiences come to life through safe, imaginative play. Our mission is to increase imagination through products that enrich, educate, and entertain kids. We are a small, high-performing team, and every hire has a major impact on the product.
Role Overview
We are looking for a senior backend engineer with strong experience in voice systems to help build the infrastructure powering Curio’s conversational experiences.
In this role, you will design, build, and scale backend systems that enable real-time voice interaction between children and Curio characters. You will own core services, APIs, and infrastructure, ensuring low-latency, reliability, and high performance.
You will collaborate closely with AI, product, and hardware teams to deliver seamless voice experiences, contribute to system architecture and technical decisions, and rapidly iterate on new features.
This role requires strong ownership, experience with real-time or streaming systems, and the ability to build scalable, production-grade infrastructure in a fast-moving environment.
Responsibilities
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- Build and maintain backend systems supporting real-time voice interactions
- Develop infrastructure for speech-to-text, text-to-speech, and conversational AI pipelines
- Optimize latency and reliability for live voice experiences
- Design scalable backend services for Curio’s AI-powered products
- Work closely with AI and product teams to integrate conversational features
- Improve performance and reliability of the voice platform
Qualifications
- 5–10+ years of backend software engineering experience
- Strong JavaScript & TypeScript experience in production environments
- Experience working with .NET and C++
- Strong experience building scalable, production-grade backend systems
- Experience designing APIs and service-oriented architectures
- Strong understanding of databases and data modeling (PostgreSQL or similar)
- Experience writing efficient SQL queries and working with complex datasets
- Experience with cloud infrastructure and distributed systems
- Strong debugging, performance optimization, and systems design skills
- Experience working with agent voice systems
- Experience building production AI agents. Some type of service to provide access to AI agent
- Experience shipping production systems used by real users
- Experience with strongly typed languages and solid understanding of type systems
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Nice to Have
- Experience with functional programming languages (e.g. F#, Scala, Haskell)
- Experience working with real-time systems (e.g. voice systems, audio processing)
- Experience working with Azure Cloud
- Experience building or working with AI-enabled systems
- Interest or experience using AI tools and agent-driven workflows to improve developer productivity
- Ability to contribute to frontend or mobile applications (React Native, React, Next.js, Expo, or similar)
- Comfort working across the stack to support end-to-end feature development
- Experience with reactive messaging queue system (such as NATS or kafka)
- Experience with low-latency streaming systems
- Experience integrating AI models into production applications
Compensation
- Salary:
- $190k-$230k + Equity
- Benefits:
- 401k matching
- Life insurance
- Health, vision and dental insurance
- Quarterly offsites
- In-office meals and snacks
- F&B stipend
- Phone stipend
- Commuter stipend
- Time Off: Unlimited PTO
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Compensation will be determined based on experience.
What We Look For
- Senior engineers with strong technical judgment
- People who can design and own critical infrastructure systems
- Experience building high-performance backend platforms
- Curiosity and excitement about voice interfaces and AI experiences
Why Curio
- Small team with high ownership and impact
- Opportunity to shape the future of AI-powered interactive toys
- Work at the intersection of AI, voice technology, and storytelling
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