Software Engineer (Full-Stack)

## About the Role ProNexus is recruiting for a profitable, fast-growing construction fintech company building mission-critical software for construction lenders. The platform helps lenders manage inspections, approvals, budgets, draw requests, payouts, fraud checks, and borrower communication in one streamlined system. This is a senior full-stack engineering role on a small, high-ownership team. You'll work across backend systems, databases, APIs, frontend UI, integrations, and legacy system improvements. The right person is a pragmatic, T-shaped engineer who has shipped and maintained production applications used by real customers and knows how to improve mature systems without overengineering. This is not a pure greenfield role. You'll be extending and improving a mature Rails-based platform that powers real construction lending workflows, while helping shape the next phase of the product and engineering culture. ## Responsibilities - Collaboratively define, scope, and architect new platform capabilities on top of a mature production system. - Extend and improve legacy systems, including payments, integrations, workflow automation, and new customer-facing features. - Work directly with databases, including writing and optimizing SQL, designing schema migrations, and ensuring API payloads are efficient and well-structured. - Build and maintain frontend product experiences using React, Hotwire, TypeScript, Tailwind, and potentially React Native. - Design and improve backend APIs, data models, background jobs, and integration workflows. - Manage background processing, job queues, and system reliability using tools like Sidekiq or similar systems. - Identify areas where legacy implementations need improvement and propose practical migration paths that balance engineering quality with business constraints. - Help establish engineering conventions, development practices, and technical culture as the team scales. - Communicate proactively in a fully remote environment, including clearly explaining technical tradeoffs, asking strong questions, and thinking through problems out loud. ## Requirements - 6+ years of professional full-stack engineering experience. - Experience shipping and maintaining production applications used by real customers. - Strong backend depth, including API design, database schema design, migrations, SQL, and background processing. - Experience working on mature or legacy systems, not just greenfield applications. - Strong frontend ability with React, TypeScript, Tailwind, Hotwire, or similar modern web technologies. - Experience with Ruby on Rails, or strong willingness and ability to work in a Rails monolith. - Comfort working with PostgreSQL, SQL query optimization, data modeling, and system-level integrations. - Ability to work independently in ambiguous environments without fully specified tickets. - Excellent verbal communication skills and the ability to explain technical decisions clearly. - Genuine curiosity about business domains outside your own expertise. ## Bonus Points - Experience in construction, fintech, proptech, lending, real estate, healthcare, or another domain where you had to deeply learn the business to build the right product. - Experience with payments, financial workflows, inspections, compliance, or operationally complex B2B SaaS. - Experience with React Native or mobile-facing product development. - Experience with Sidekiq or other background job processing systems. - Experience at a startup or small engineering team where you owned projects end to end. ## Tech Stack - Ruby on Rails - React - React Native - Hotwire - TypeScript - Tailwind - PostgreSQL - SQL - Sidekiq ## Important Fit Notes - This role is best for someone who enjoys improving real production systems, not just starting from scratch. - The team is looking for someone who can contribute across the stack while bringing especially strong backend, database, and system design judgment. - Strong communication is critical. The team values engineers who can talk through tradeoffs, clarify ambiguity, and collaborate through conversation. - The company is fully remote, with core collaboration hours around 10 AM–3 PM Mountain Time. ## Why This Role - You'll join a profitable, organically growing startup backed by strong proptech investors. - You'll work on mission-critical software in a real-world industry where faster money movement directly impacts construction projects and housing availability. - You'll have meaningful ownership on a small team with direct access to the founders and technical leadership. - You'll help shape the next stage of the engineering organization as the company scales beyond its current platform.