Founding Engineer

Senior Software Engineer (TypeScript / React / LLM Systems) * AI Infrastructure * $250,000 * Hybrid (2 days/week) * New York, NY

Must be based in NYC & the role requires US Citizenship due to regulatory constraints. No sponsorship/visas/Green Card., We’re hiring a Senior Software Engineer to help build production-grade LLM-powered systems used in high-impact, real-world workflows.

This is a true SWE + ML role. You’ll sit at the intersection of frontend UX, backend systems, and applied machine learning - owning features end to end. That includes React-heavy user interfaces, TypeScript services, and the pipelines that power LLM reasoning, retrieval and fine-tuning behind the scenes.

You’ll work closely with product, design and ML engineers to ship tools where reliability, clarity and user experience matter just as much as model quality., * Design and build TypeScript services that power LLM workflows including RAG pipelines, prompt orchestration and fine-tuning flows.

• Develop rich, intuitive React interfaces for AI-driven products - heavy focus on UX, clarity and usability.
• Implement retrieval systems using vector databases, hybrid search and structured data sources.
• Work hands-on with LLM APIs and open-source models (OpenAI, Anthropic, open-weight models).
• Collaborate with ML engineers on evaluation, fine-tuning strategies and production rollout.
• Own backend architecture across Node.js services, async pipelines and model-facing APIs.
• Improve system reliability through logging, monitoring, tracing and failure handling.
• Mentor engineers and contribute to design and architecture decisions across the platform.

Tech Stack

Frontend: React, TypeScript, Next.js, Tailwind CSS, Storybook

Backend: Node.js, TypeScript, REST, GraphQL

LLM Systems: RAG pipelines, fine-tuning workflows, prompt orchestration

Data & Retrieval: PostgreSQL, Vector DBs (Pinecone, Weaviate, pgvector), Redis

Infrastructure: AWS, Docker, Kubernetes, Terraform

Observability: OpenTelemetry, Prometheus, Grafana, Sentry

• Experience building production LLM systems beyond prototypes
• Hands-on fine-tuning experience (LoRA, adapters, evaluation pipelines)
• Background in ML engineering or applied NLP
• Experience designing complex frontend UX for data-heavy or AI-driven products
• Familiarity with model evaluation, guardrails and hallucination mitigation

1. Technical Deep-Dive (TypeScript / React + LLM systems, 60 mins)
2. System Design & Architecture (45 mins)
3. Leadership Chat with CTO (30 mins) Offer

What We Offer

Comp: $160K-$240K W-2 (+ meaningful equity)

Benefits: Health, dental, vision, 401(k)

Time Off: Flexible PTO + company holidays