Senior Fullstack Engineer, Internal Platform Development

Recruiting from Scratch • United States

Relocation

This Job is No Longer Active This position is no longer accepting applications

AI Summary

Build and maintain mission-critical internal platforms for AI training and evaluation data generation, management, review, and delivery. Own full-stack applications spanning contributor workflows, operational tooling, and customer delivery systems. Requires 5+ years of professional full-stack engineering experience with deep expertise in JavaScript/TypeScript, React, Next.js, and Python/Node.js.

Key Highlights

Own mission-critical internal platform for AI training data generation and delivery

Build scalable React and Next.js applications supporting thousands of daily users

Design backend APIs, services, workflows, and data pipelines for core platform functionality

Partner with Product, Applied AI, Operations, and Engineering teams to translate requirements into scalable solutions

Drive frontend architecture decisions and engineering best practices across the team

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Key Responsibilities

Own and evolve a mission-critical internal platform used to generate, manage, review, and deliver AI training and evaluation data

Build and maintain full-stack applications spanning contributor-facing workflows, operational tooling, and customer delivery systems

Develop scalable React and Next.js applications that support thousands of daily users

Design and implement backend APIs, services, workflows, and data pipelines that power core platform functionality

Build extensible infrastructure that enables teams to rapidly launch new task formats, workflows, and AI data products

Partner closely with Product, Applied AI, Operations, and Engineering teams to translate ambiguous requirements into scalable solutions

Drive frontend architecture decisions, component design standards, and engineering best practices across the team

Improve performance, reliability, usability, and scalability across complex data-intensive systems

Contribute to platform foundations that support future AI evaluation environments, reinforcement learning workflows, and data generation pipelines

Help shape the technical direction of one of the company's most strategically important products

Technical Skills Required

JavaScript TypeScript React Next.js Python Node.js

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Benefits & Perks

Base salary: $130,000–$400,000

Generous equity package vested over four years

Bi-annual performance bonus structure

Up to $15,000 relocation assistance

$10,000 proximity bonus for employees living within walking distance of the office

$1,500 monthly meal stipend

Complimentary Equinox membership

Monthly wellness and lifestyle reimbursements

Comprehensive medical, dental, and vision coverage

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Nice to Have

Background building data labeling, annotation, evaluation, or human-in-the-loop AI platforms

Background developing internal developer platforms, workflow engines, or operational tooling

Experience with design systems, component libraries, and frontend architecture leadership

Exposure to AI products, LLM-powered applications, AI infrastructure, or machine learning workflows

Experience working with real-time systems, analytics platforms, or data visualization tools

Background at high-growth startups or top-tier technology companies

Experience supporting multi-tenant platforms, large-scale data pipelines, or workflow orchestration systems

Strong interest in AI infrastructure and the systems that support frontier model development

Job Description

Who is Recruiting from Scratch:

Recruiting from Scratch is a specialized talent firm dedicated to helping companies build exceptional teams. We partner closely with our clients to deeply understand their needs, then connect them with top-tier candidates who are not only highly skilled but also the right fit for the company’s culture and vision. Our mission is simple: place the best people in the right roles to drive long-term success for both clients and candidates.

https://www.recruitingfromscratch.com/

Title of the Role: Senior Fullstack Engineer, Studio Experience

Location: San Francisco, CA

Company Stage of Funding: Series C AI Infrastructure Company ($10B Valuation)

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