Full-StackEngineer

ABOUT THE ROLE A seed-stage construction lending fintech is looking for a Full-Stack Engineer with 6+ years of experience to join a small, high-velocity remote team. You'll work across the entire stack — from database schema design and API development to React front-end UI — extending and improving a mature, mission-critical Rails monolith that powers construction lending workflows. This is a hands-on, high-ownership role for a pragmatic engineer who thrives in ambiguity and is genuinely curious about domains outside their own expertise. Experience in construction, fintech, proptech, or any domain requiring deep business understanding is a strong plus. Visa sponsorship is not available; candidates must have U.S. work authorization. WHAT YOU'LL DO - Collaboratively define, scope, and architect new platform capabilities on top of a 6-year-old Rails monolith serving mission-critical construction lending workflows - Take ownership of extending and improving legacy systems — adding payments, integrations, and new features in a seamless, secure, and scalable way - Write and optimize SQL, design schema migrations, and ensure API payloads are efficient and well-structured - Develop and maintain web (React, Hotwire, TypeScript, Tailwind) and mobile-facing (React Native) features, ensuring platform alignment - Manage background processing and job queuing (Sidekiq) to ensure system reliability without over-reliance on expensive vendor solutions - Identify where legacy implementations need improvement and propose practical migration paths balancing engineering quality with business constraints - Help establish engineering culture, conventions, and development practices as the team scales - Serve as a technical leader and mentor others on the team - Manage the end-to-end software delivery lifecycle, including testing, release management, and monitoring - Communicate proactively in a fully remote, async-friendly environment — articulate your thinking, ask the right questions, and