Senior Full-Stack Engineer (Backend-Leaning)

This is a role that TechTree is recruiting for on behalf of one of our clients.

TechTree is an AI-driven recruitment platform working with high-growth companies.

When you apply, our AI Agent matches you not just to this role, but to other relevant opportunities across our network, so one application can unlock multiple roles.

About the Role

As a Senior Full-Stack Engineer (backend-leaning), you will own end-to-end development of features from conception through architecture, implementation, shipping, and iteration. You will handle backend-heavy work with some infrastructure and DevOps responsibilities, implement frontend functionality when needed, and work directly with users to translate feedback into improvements. The role also involves building AI-enabled systems, including agentic workflows and model interaction pipelines, in production environments.

What You'll Be Doing

• 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

What We're Looking For

• Senior full-stack experience, backend-leaning, with strong production ownership

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• 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

Compensation & Benefits

• $200,000–$240,000 salary, 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 — closer to “Cursor for knowledge work” than a chatbot.

Raised $30M in seed funding from Spark Capital, Felicis, and Y Combinator.

The team includes former founders, CTOs, and high-agency engineers, all operating with full ownership and end-to-end responsibility.

The company is preparing for a major public launch and operates at the intersection of AI and productivity.

What is TechTree?

TechTree combines AI agents with a human support team to give candidates a better, more transparent hiring experience.

Our AI Agent gets to know your background, experience, and what you're optimising for. It continuously matches you to live roles across our network where there's genuine alignment, not just keyword overlap.

Our Human Team is there to support you through the process:

• Answer questions about roles, process, and next steps
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• Help unblock stalled processes or unclear feedback
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If you apply: you'll be considered for this role, you may also be matched to other relevant roles, and if there's no fit, we won't spam you.