Full-Stack Engineer

### **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 collaborate through conversation ### **What We're Looking For** **Required (dealbreakers):** * 6\+ years of full\-stack software development experience in production environments * Strong proficiency with **Ruby on Rails**, including extending and maintaining mature monoliths and legacy systems * Experience shipping and maintaining production applications used by real customers * U.S. work authorization — visa sponsorship is not available **Also required:** * Proficiency with **React, TypeScript, Tailwind, and Hotwire** * Experience with mobile frontend development using **React Native** * Strong **SQL and PostgreSQL** experience, including schema design and migrations * Experience with background processing and job queues (**Sidekiq**) * Hands\-on experience with **payments integrations** and related API design, ideally within fintech, proptech, or construction lending * Ability to architect platform capabilities, scope features