Founding Product Engineer

Rex•Austin, TX

1d•Remote

About The Position

Rex is hiring a Founding Product Engineer to translate the vision of an AI-first real estate ERP into a durable, trusted system that becomes the single source of truth across the business. This platform will unify financial, operational, and reporting workflows. The mandate is clear: build systems that are exact in their correctness, trusted in daily use, and intelligent by design. This role owns outcomes across product, engineering, and architecture, ensuring speed, rigor, and precision in how the system is built and deployed. You will operate as the connective tissue between accounting, operations, and engineering, driving alignment between real-world workflows and system design while maintaining uncompromising standards for accuracy, auditability, and performance. You will architect and build an AI-first platform from the ground up, embedding intelligence into workflows and turning financial data into real-time, decision-grade insight. You will establish systems, product principles, and engineering discipline that convert complexity into clarity, balancing technical depth with product usability and ensuring the system scales with the business. This is a hands-on, high-impact role for a builder who has grown from engineering into product leadership, with the ability to own critical infrastructure end to end. It is a front-line seat for someone who wants to define how a business operates through software, not just ship features.

Requirements

5-8+ years of experience in software engineering, with progression into product leadership or technical product ownership roles
Strong engineering foundation with proficiency in modern programming languages such as TypeScript, Python, or similar
Experience building and shipping complex, data-intensive systems where correctness and reliability are critical
Familiarity with accounting principles, financial reporting, and compliance requirements, or demonstrated ability to learn quickly and operate with precision
Experience designing system architecture, data models, and scalable backend systems
Hands-on experience with modern frameworks and tools such as React, Node.js, Postgres, and cloud platforms like AWS or GCP
Familiarity with AI and LLM-based systems, including how to embed intelligence into workflows and products
Experience working with APIs, integrations, and distributed systems across multiple products
Strong product instincts with the ability to translate user needs into clean, effective system design
Demonstrated ability to operate with ownership in ambiguous, zero-to-one environments
High standards for code quality, system integrity, and user experience
Strong communication skills with the ability to work cross-functionally with technical and non-technical stakeholders
Builder mindset with a focus on durability, correctness, and long-term system value over short-term wins
High agency, persistence, and bias toward action in solving hard problems
Missionary mindset with full alignment to Rex’s mission and a disciplined, truth-seeking approach to building systems

Nice To Haves

Background in fintech, accounting systems, ERP platforms, or infrastructure software strongly preferred
Bachelor’s degree in computer science, engineering, or a related field preferred

Responsibilities

Own the end-to-end development of products that will produce/protect accurate information from a tax and accounting perspective
Architect system design to ensure accuracy across tax, compliance, reporting, and auditability requirements
Build and lead engineering efforts, writing code where needed and setting technical direction
Translate accounting and operational workflows into scalable, intuitive product experiences
Design and implement AI-first capabilities that embed intelligence into core workflows and reporting
Establish data models, system architecture, and integrations across the broader Rex tech ecosystem
Partner closely with accounting, finance, and operations teams to ensure real-world correctness and usability
Drive product roadmap, prioritization, and execution with a bias toward speed and quality
Ensure system reliability, performance, and scalability as usage and complexity grow
Implement best practices for code quality, testing, deployment, and security
Evaluate and integrate third-party tools, APIs, and infrastructure where appropriate
Continuously refine the system to improve usability, automation, and decision-making capabilities
Operate with full ownership and accountability for product outcomes and system integrity