Senior Full Stack Engineer; NYC

Position: Senior Full Stack Engineer (NYC)
Who we're looking for...

Role:
Senior Full Stack Engineer
Team:
Engineering

Reports To:

Head of Engineering

Location:

Knit's NYC office (Hybrid)
Operating hours:
Monday - Friday 9am - 5pm EST.
Travel:
This role will occasionally be expected to travel for in-person internal working sessions, and our once per year US All Team Summit. [To be less than 15%]

A little about us...

Knit is building the agentic AI platform that helps enterprise brands run end-to-end consumer research. We orchestrate specialized AI agents for surveys, data collection, analysis, and reporting, delivering decision-grade insights to Fortune 1000 brands in hours, not weeks.

In under two years, we've partnered with 50+ leading enterprise brands, including Amazon, Mars, NASCAR, JBL, ESPN, and Paramount. Knit has grown 500% in the last 12 months and raised $30.6M to date, including a $16.1M Series A in July 2025. Here are example case studies that demonstrate the value of our platform. A product demo can be found here.

Overview

We're building our foundational NYC engineering team from scratch and looking for exceptional builders who are resourceful, deeply technical, and thrive in high-ownership environments.

As one of the first in-house engineers, you'll shape the core of our platform and the culture of a team that will scale to 20+ over the next 18 months. You'll build and orchestrate AI agents, pioneer new UX paradigms, and tackle some of the hardest problems in applied AI with autonomy and end-to-end ownership.

Business Impact | What you will own...

• Own 0→1 and 1→N features across the stack, from design docs to building high-throughput data pipelines and scalable FastAPI services.
• Architect and own the core agent orchestration engine, designing complex, multi-agent LLM workflows (routing, tool-use, memory, evaluation) with deterministic fallbacks, guardrails, and auditable actions required by enterprise users.
• Build AI-native, human-in-the-loop UIs. Craft React/Next.js interfaces that let users collaborate safely with agents, with transparency and explainability by design.
• Develop the "factory for the factory". Build our experimentation platform: CI/CD for prompts and agents, offline/online evals, drift detection, safety layers, and rollout controls.
• Ship fast, safely. You'll instrument everything for reliability, write concise design docs, add robust tests, and build dashboards and alerts for features you launch.
• Partner cross-functionally with Product, AI, Design, CS; talk to customers and SMEs, and turn ambiguous problems into shipped product.
• Obsess over performance, optimizing for latency across the system: caching, model selection, distillation, batching, vector search, and infrastructure efficiency (GPU/CPU).
• Operate what you build. This includes on-call ownership, leading incident response, and driving learning through blameless postmortems.

Our Stack

• Frontend:
  React, Next.js
• Backend:
  Python, FastAPI
• Data/ML:
  Mongo
  
  DB, S3, Redis;
  Pinecone
• Infra: AWS, Docker, Kubernetes; CI/CD with Git Hub Actions.
• Messaging: SQS; event-driven pipelines.

This role is for you if...

• You're a 0 → 1 builder who thrives in ambiguity and has shipped products from scratch at a startup or in a hyper-growth phase. You've seen both - early-stage hustle and later-stage scale and know how to build for it.
• You're a systems thinker with deep technical chops: you design clear architectures and write clean, tested Python and Type Script.
• You think like an owner: you spot problems, propose solutions, and build them without waiting for perfect specs. Your impact is measured in business outcomes.
• You use AI as leverage. Tools like Cursor, Copilot, or Claude Code are integral to your workflow, helping you ship faster while maintaining a high standard for correctness.
• You believe speed and quality aren't opposites and can articulate the tradeoffs you make.
• You communicate crisply. You share your ideas effectively and thrive in tight feedback loops with product, design, and customers.
• You've got grit: hard problems energize you, context switching doesn't scare you, and you're comfortable deleting code.

This role is NOT for you if...

• You see a hard line between "frontend," "backend," and…