Nonprofits do some of the most important work in the world, and most of them are still managing grants in spreadsheets. Instrumentl is a profitable, hypergrowth, YC-backed SaaS platform building the operating system for grant-funded organizations. More than 5,500 nonprofits use Instrumentl to discover, track, and win grant funding, from local community organizations to the San Diego Zoo and the University of Alaska.

We're growing quickly, customers love us (check out our G2 reviews!), We're hiring a Senior Backend Engineer to own AI features end to end, from rapid prototype to production and the evaluation that keeps them honest. You'll build the APIs, tool-using agents, and RAG pipelines that turn frontier LLMs into grant discovery, application drafting, and research tools our 5,500+ nonprofits rely on every day. It's a high-ownership seat on a small team, where what you ship reaches customers fast and you help shape how we build AI here.

Ship AI to production Build tool-using LLM agents (task planning, function and tool calling, multi-step workflows, guardrails) for grant discovery, application drafting, and research assistance. Stand up evaluation and observability so our AI stays grounded, safe, and cost-effective. Write high-quality, thoroughly tested code across the backend and the data pipelines that power retrieval and evaluation.

Partner with Product, Design, and GTM on scoping, UX, and measurement. 7+ years building and shipping production backend systems in Python (FastAPI, Celery, or equivalent),



taking features from prototype to production with real reliability practices like tests, observability, and rollback. ~ Hands-on experience building LLM features in production: tool and function calling, multi-step agent workflows, and the guardrails and evals that keep them grounded, safe, and cost-effective.

Strong data fundamentals: SQL, schema design, and building pipelines that power retrieval and evaluation. ~ Thrives in a rapid, scrappy startup environment with high ownership and a bias for action, speed, quality, and simplicity. TypeScript and Node, plus familiarity with Ruby on Rails (our core platform) or a willingness to learn it.

Experience with AWS or GCP, Docker, CI/CD, and observability (logs, metrics, traces). For US-based candidates, the target salary range for this role is 175,000 - $220,000 USD, plus equity. Final compensation is determined based on experience, skillset, scope of responsibility, interview performance, and geographic location. 100% covered health, dental, and vision insurance for employees (50% for dependents) ~ Generous PTO, including parental leave ~Company laptop and home-office stipend ~ Bi-annual company retreats ~ We are committed to building an inclusive workplace and do not discriminate based on race, color, religion, sex, national origin, age, disability, veteran status, sexual orientation, gender identity or expression, genetic information, or any other legally protected status.

📌 Senior Backend Engineer JS (REMOTE) (Fitzgerald)
🏢 Instrumentl
📍 Fitzgerald