Senior Full Stack Software Engineer

Instrumentl is a profitable, hypergrowth, YC-backed SaaS platform building the operating system for grant-funded organizations. As a Senior Full Stack Engineer, you will work across design, product, content, and support to deliver a best-in-class experience to every user, owning problems from ideation through shipped solutions.

Responsibilities:

• Build, operate, and improve products for every Instrumentl customer, from small local nonprofits to large organizations
• Create responsive interfaces and APIs that drive customer adoption and retention
• Contribute high-quality, thoroughly tested code across resilient backends and trustworthy user interfaces
• Own problems end to end, managing complexity from ideation through shipped, reliable solutions
• Use AI tooling with judgment to move faster while owning the quality, correctness, and long-term maintainability of what you ship
• Partner with product, sales, support, and content to improve internal tools and processes
• Act as a strategic partner, weighing business impact, reliability, and the detail of every customer interaction
• Uphold Instrumentl's quality standards and mentor newer engineers to the same bar

Requirements:

• 7+ years as a software engineer building and shipping production software
• Generalist range: comfortable moving across frontend, backend, infrastructure, and data or billing pipelines as the work demands
• Deep, hands-on experience with Ruby on Rails in production: this is our primary stack and where you'll spend most of your time
• Working fluency across Python, JavaScript, PostgreSQL, Redis, and HTML/CSS, with an openness to adopting new tools
• A track record of owning problems end to end and delivering them from ideation to completion
• Startup or early-stage experience
• Experience mentoring or leveling up other engineers