Senior Full Stack Engineer (React & Ruby on Rails) (San Francisco)

Position Overview

Join Costanoa Ventures and Ichi on our mission to transform construction permitting and code compliance using AI and large language models (LLMs). As a Senior Full Stack Engineer (React & Ruby on Rails), you will own the entire product lifecycle—from brainstorming and technical design to implementation and release—ensuring our innovative platform meets real customer needs while driving efficiency and safety in the construction industry. This fully remote position (US based candidates only) offers a competitive pay range of $145,000.00/yr - $190,000.00/yr based on your skills and experience.

Key Responsibilities

• Own the full product lifecycle—from brainstorming and technical design to implementation and release.
• Navigate trade-offs thoughtfully with customer impact in mind.
• Collaborate closely with internal customers to genuinely understand and address their needs.
• Develop and scale a system that seamlessly integrates multiple LLMs while avoiding dependence on any single model.
• Work within a small, dynamic team to define and execute the technology strategy, reporting directly to the Head of Engineering.
• Engage directly with users to gather feedback and continuously refine our solutions.

Required Qualifications

• 8+ years of professional engineering experience in tech and product-driven companies.
• Bachelor’s degree in Computer Science or equivalent foundational experience.
• Expertise in Ruby on Rails and React with proven experience building production-grade applications.
• Demonstrated ability to take a product from concept to launch while maintaining high quality.
• Strong product intuition combined with the ability to work independently in ambiguous situations.
• Experience with or interest in AI and using AI-powered tools in your workflow.
• Ability to work remotely and support a Pacific time-based environment.

Preferred Qualifications

• Experience with TypeScript, GraphQL, Postgres, AWS, and working with LLMs.
• Proven startup experience.

Benefits & Perks

• Competitive base salary (Range: $145,000.00/yr - $190,000.00/yr) + stock options.
• Medical, Dental, Vision coverage.
• Flexible PTO.
• Fully remote working arrangement for US based candidates.