Senior Software Engineer - Greenhouse

Greenhouse is the first Orchestrated Hiring Ecosystem: a single place that brings the right person and the right role together at the right time. Our mission is to make hiring work for everyone – so we go to great lengths to hire great people because we believe that they’re the foundation of our success. At Greenhouse, you’ll join a team that collaborates purposefully, fosters inclusivity, and communicates with transparency and accountability so we can achieve our mission.

Greenhouse has partnered with Deel to be its Employer of Record in Argentina. Through this arrangement, Deel is hiring a Senior Full Stack Software Engineer to provide services to Greenhouse.

This role will support the design, development, and evolution of the Company’s web-based applications. In this role, you will work across the entire application stack to deliver high-quality features for the Company, ranging from building net-new functionality to improving how data flows across services at scale.

Who Will Love This Job

• A Pragmatic Architect – You don’t just write code; you think about how systems connect, refining data models and architecture for long-term scalability.
• A Full-Stack Specialist – You are equally comfortable navigating a PostgreSQL query, styling a React component, or building a robust controller in Rails.
• A Quality Advocate – You believe “done” includes comprehensive automated tests and clear documentation, leaving the codebase better than you found it.
• A Collaborative Problem-Solver – You thrive in an environment where code reviews are a dialogue and cross-functional collaboration is the norm.
• An AI-Fluent Engineer – You already use tools like Claude to move faster and are excited to build on that experience.

What You’ll Do

• Build, modify, and maintain features using Ruby on Rails, modern JavaScript frameworks (React), HTML, and CSS.
• Execute on high-impact projects while ensuring code is maintainable and aligned with engineering standards.
• Contribute to system architecture, including improvements to data transfer across services and ingestion pathways.
• Design and maintain RESTful APIs, webhook-driven integrations, and data exchange pathways with third-party systems.
• Diagnose and resolve complex integration issues to improve information flow.
• Design and update PostgreSQL data models, refactoring legacy models to improve performance and reduce complexity.
• Participate in production support during working hours, addressing bugs and escalations as needed.
• Use monitoring and observability tools to maintain application stability and support performance tuning.
• Participate in peer code reviews, produce technical documentation (architecture notes, runbooks), and write automated tests (unit, integration, and E2E).

You Should Have

• 5+ years of experience writing and maintaining production-level code in a professional environment.
• Strong experience with Ruby and Ruby on Rails.
• Experience with JavaScript and React, plus solid HTML and CSS fundamentals.
• Deep understanding of MVC architecture and backend optimization.
• Proven ability to write efficient SQL, design relational data models, and optimize PostgreSQL performance.
• Experience building and consuming RESTful APIs and managing third-party integrations via webhooks.
• Proficiency with automated testing frameworks (e.g., RSpec, Jest, Cypress) and a commitment to test-driven practices.
• Ability to contribute to architectural discussions and implement solutions operating effectively at scale.
• Comfort working in agile environments using Git, CI/CD pipelines, and observability platforms.
• Fluency in agentic coding and leveraging/configuring AI tooling.

Who We Are

At Greenhouse, we live by our mission through using our own product to help us hire the right person for the job, every time. We’re committed to designing and responsibly using AI tools to transform how we work while keeping people at the center. We are a remote-first company with shared office spaces in New York City and Ireland, plus optional co-working spaces that give us flexibility to do our best work anywhere.