Senior Full-Stack Engineer (Backend-Leaning) - AI Productivity

About the Role

We are seeking a Senior Full-Stack Engineer (Backend-Leaning) remote to join our innovative team at TechTree. In this role, you will be responsible for the end-to-end development of features, from conception through architecture, implementation, shipping, and iteration. This position is perfect for someone who enjoys backend-heavy work while also having the opportunity to implement frontend functionality when needed. You will work directly with users to translate their feedback into actionable improvements, making a significant impact on our AI-enabled systems.

What You'll Do

• Own features from conception through architecture, implementation, shipping, and iteration with no handoffs.
• Handle backend-heavy development, infrastructure, and DevOps responsibilities.
• Engage directly with users to gather feedback, run experiments, and ship improvements.
• Build AI systems on top of models, including agent loops, workflow orchestration, and reliable production pipelines.
• Collaborate with other engineers to ensure robust, scalable, and maintainable systems.
• Contribute to architecture and technical design decisions across the stack.

Requirements

• Senior full-stack experience, backend-leaning, with strong production ownership.
• Deep systems design skills; able to plan for scale, reliability, and maintainability.
• Comfortable owning infrastructure and DevOps responsibilities.
• Experience building AI-enabled products, understanding agentic workflows and model interaction patterns.
• High agency; able to operate independently in fast-moving, ambiguous environments.

Nice to Have

• Experience working with multiple AI model integrations in production.
• Familiarity with TypeScript, React, Next.js, Node.js, PostgreSQL, Cloudflare, and AWS.

What We Offer

• Competitive salary of $200,000–$240,000, plus meaningful equity.
• Fully on-site in San Francisco, with relocation support if needed.
• High ownership culture and end-to-end product impact.
• Structured onboarding and mentorship from experienced team members.
• Access to modern development tools and infrastructure.

About the Company

Our client is a 12–14 person AI-native team building a personal AI assistant for knowledge workers. They have raised $30M in seed funding from Spark Capital, Felicis, and Y Combinator, and the team includes former founders, CTOs, and high-agency engineers. The company operates at the intersection of AI and productivity, preparing for a major public launch.