Full-Stack Engineer (React/Rails) - Hybrid, Equity

Underdog: Verified engineers. Interview-ready. Searching confidentially. And companies apply to you; San Francisco (CA); Hybrid; USD 250,000 - 350,000; Full time

Benefits offered by this job

Hybrid work option

Health benefits

401(k) matching

Unlimited PTO

Learning stipend

Job summary

Underdog is hiring a Full Stack Engineer to architect and deliver high-impact features across web and mobile platforms, influencing the product roadmap for enterprise-ready solutions.

You will work on React (TypeScript) frontend and Rails backend, optimizing performance in AWS, PostgreSQL, and RESTful APIs, with opportunities to own code reviews and architectural decisions in a fast-growing startup.

Qualifications

• 3+ years of full-stack development experience with React and/or Ruby on Rails in production environments.
• Expertise in modern JavaScript/TypeScript, REST API design, and relational databases (PostgreSQL preferred).
• Proven track record of shipping high-quality B2B SaaS products for non-technical users.
• Strong grasp of cloud platforms (AWS), containerization (Docker), and infrastructure-as-code principles.
• BS/MS in Computer Science or equivalent hands‑on engineering experience.
• Must be based in the SF Bay Area and comfortable with a hybrid work model (2-3 days in-office).

Responsibilities

• Ship end-to-end solutions using React (TypeScript) for frontend and Ruby on Rails for backend systems, ensuring seamless integration between web and mobile apps.
• Optimize performance, scalability, and security across PostgreSQL databases, RESTful APIs, and AWS cloud infrastructure.
• Lead code reviews and architectural decisions while managing technical debt in a fast-paced startup environment.
• Partner with product managers and customer success teams to translate non-technical user needs into elegant technical solutions.
• Implement CI/CD pipelines and automated testing frameworks to maintain rapid, reliable deployment cycles.
• Troubleshoot production issues and contribute to on-call rotations for mission-critical systems.

Skills

React

Ruby on Rails

3+ years experience

JavaScript/TypeScript

REST API design

PostgreSQL

AWS

Docker

Infrastructure as Code

B2B SaaS experience

Education

BS/MS in Computer Science or equivalent

Tools

PostgreSQL

AWS

Docker

Job description

Underdog is hiring a Full Stack Engineer to architect and deliver high-impact features across web and mobile platforms, influencing the product roadmap for enterprise-ready solutions.

You will work on React (TypeScript) frontend and Rails backend, optimizing performance in AWS, PostgreSQL, and RESTful APIs, with opportunities to own code reviews and architectural decisions in a fast-growing startup.