Full Stack Software Engineer - Agentic AI Startup

Mountain View

Join NinjaTech AI as a**Full Stack Software Engineer** tobuild the future of autonomous AI agents: technology that doesn't just assist, but actually executes complex tasks end-to-end. You will learn and use the latest tech to innovate, build and scale intelligent Apps and automations (B2B and B2C), powered by SuperNinja - our advanced agentic AI platform with full OS capabilities. For this role we will prioritize candidates who have strong experience in Frontend development (in React, Next.js). **Why this opportunity is exciting:** * **First FE-Leaning Engineer at HQ**: you will work side-by-side with expert-level Full stack engineers * **Founding Team Impact**: Work directly with founding engineering team (mostly ex-AWS) and ex-Google Product/UX leaders * **Cutting-Edge AI**: Build infrastructure, OS and UI for autonomous AI agents that can actually do things end to end (intelligent Apps and automations) * **High Velocity, High Impact**: Ship features that millions of users will interact with (B2C and B2B) * **Technical Ownership**: Own significant parts of the product architecture and make decisions that will scale with the company! **About the Company:** ++NinjaTech AI++ is a generative AI startup with headquarters in Silicon Valley and a subsidiary in Sydney. NinjaTech AI is backed by Alexa Fund and Samsung Ventures and we are on track to raise Series A funding in 2026. **About the Role:** The**Full Stack Engineer** is a full-time position, based at our HQ office in Los Altos, California (**5 days on-site**; great office space, free daily meals). Our team works in a fast-paced and collaborative environment. We get a lot done when we ideate together and iterate quickly. As a Software Development Engineer, you'll design and build user-facing features as well as back-end infrastructure that make our autonomous AI agents accessible, fast and powerful. You will report to the VP of Engineering and will collaborate on a daily basis with the founder/CEO and the VP of Product. **What you will build:** As a key member of ++our engineering team++, the **Software Engineer** will be responsible for translating our vision and customer needs into functional and appealing interactive applications, ensuring a great user experience. * Develop and implement serving architecture for our distributed systems with focus on scalability, observability, and efficiency * Design and build components for internal SDKs for services and integrate them in collaboration with other developers * Write robust and well-documented code, ensuring quality through automated testing and continuous integration and deployment * Work effectively in a fast-paced, dynamic team environment, contributing to multiple projects * Conduct code reviews and provide constructive feedback to other members of the team * Develop and maintain documentation for the platform, including API documentation, technical guides, and technical specifications * Explore new tools and technologies that can improve development efficiency and product quality **Required Experience:** * 3 years of experience in software development, with a focus on building scalable and reliable web applications. * Expert-level experience in React. * Proficiency in Next.js and Python. * Experience with AWS Cloud. * Strong expertise in various API protocols, including RESTful API and WebSockets. * Familiarity with database technologies such as Firebase, Supabase, DynamoDB, NoSQL, PostgreSQL, or MySQL. * Hands-on experience in building microservices for service-oriented architecture (SoA) on top of AWS services, leveraging various components (e.g., SQS, Lambda, SNS, ECS, etc.). * In-depth understanding of the entire web development process (design, development and deployment). * Familiarity with RESTful APIs and integration of backend services. * Knowledge of version control systems (e.g., Git) and experience working with collaborative development tools. * Ability to perform well in a fast-paced environment where deadlines are tight and priorities can change rapidly. * Strong problem-solving skills and ability to work in a team environment. **Preferred Qualifications:** * Bachelor's or Master's degree in Computer Science or Engineering * Experience with Large language models (LLMs) and AI agent frameworks, as well as machine learning model deployment and serving * Knowledge of real-time systems and WebSocket/streaming protocols * Experience with infrastructure as code (CDK, Terraform, CloudFormation) * Experience in a high-growth startup environment * Experience with observability tools (Grafana, DataDog) **Benefits:** * Excellent Health insurance plans * 401(k) * Generous Paid Time Off (Vacation, Sick \& Holidays) * Paid meals and snacks * Equity grants (we are still pre-Series A so it's a great time to join the founding team!)