Full Stack Engineer

A4Assist is a startup seeking a Senior Full-Stack Engineer who thrives in dynamic environments. The role involves architecting and building new platform capabilities, improving legacy systems, and collaborating closely with product and business stakeholders.

Responsibilities:

• Architect and build new platform capabilities on top of a mature Rails monolith
• Improve and scale legacy systems with a strong focus on reliability and maintainability
• Design and optimize APIs, SQL queries, schema migrations, and background jobs
• Build modern web experiences using React, TypeScript, Tailwind, and Hotwire
• Contribute to mobile-facing functionality using React Native
• Own features end-to-end including testing, deployment, monitoring, and iteration
• Collaborate closely with product and business stakeholders in a fast-moving environment
• Help shape engineering culture, standards, and technical direction

Requirements:

• 6+ years of professional full-stack engineering experience (4–5 years considered for exceptional candidates)
• Strong backend depth: APIs, SQL, schema design, migrations, job queues
• Experience shipping and maintaining production applications used by customers
• Hands-on experience with React, TypeScript, PostgreSQL, and Ruby on Rails
• Comfortable navigating ambiguity and independently driving work forward
• Excellent verbal communication and ability to explain technical tradeoffs clearly
• Startup experience or highly cross-functional engineering background preferred
• Experience in fintech, proptech, construction tech, or regulated industries
• Experience with Sidekiq or equivalent background processing systems
• Exposure to React Native and mobile architecture