Software Engineering Intern (Summer 2027)

Scale AI, Inc.; San Francisco (CA); On-site; USD 55,000 - 83,000; Full time

Job summary

Scale AI, Inc. in San Francisco offers a Summer 2027 internship where interns own real, shipped work on the same roadmaps as full-time engineers, with mentorship from world-class talent.

This is a premier program designed to turn interns into Scaliens who often return as full-time hires. Applicants should be graduating Fall 2027 or Spring 2028 with a BS in CS/EECS/CE/Statistics, and have product engineering experience including full-stack web apps, API integration, and customer-facing work.

Qualifications

• Graduation date Fall 2027 or Spring 2028 with a Bachelor's degree in a relevant field.
• Summer 2027 internship availability in San Francisco (May/June start).
• Experience building full-stack web apps and integrating with APIs and services.
• Previous CS/Software Engineering internship experience.
• Track record of shipping high-quality products and features.
• Experience processing large volumes of data.
• Experience with Python, Typescript, React, and/or MongoDB.

Responsibilities

• Build reinforcement learning and post-training data pipelines powering frontier model development.
• Develop evaluation infrastructure to measure model reliability for customers.
• Ship agentic AI applications and the tooling to observe and test them.
• Create UI/UX tooling alongside ML algorithms for large-scale contributors.
• Develop AI infrastructure products to visualize and query Scale data.

Skills

Full-stack development

Customer interaction

Shipping high-quality features

Data processing systems

Python

Typescript

React

MongoDB

Education

Bachelor's degree in CS/EECS/CE/Statistics

Tools

Python

Typescript

React

MongoDB

Job description

At Scale, our mission is to develop reliable AI systems for the world's most important decisions. For 10 years, Scale has provided the high-quality data and full-stack technologies that power the world's leading models, and has helped enterprises and governments build, deploy, and oversee AI applications that deliver real impact. We work closely with industry leaders like Meta, Ernst & Young, Mayo Clinic, Time Inc., the Government of Qatar, and U.S. government agencies including the Army and Air Force.

Scale's internship is not a side project. Interns own real, shipped work on the same roadmaps as full-time engineers, with mentorship from world-class talent and a culture that values ownership, speed, and truth-seeking. Many of our interns return as full-time Scaliens.

Example Projects

• Build reinforcement learning and post-training data pipelines that power frontier model development
• Develop evaluation infrastructure that measures model reliability for enterprise and public sector customers
• Ship agentic AI applications and the tooling that makes them observable, testable, and safe to deploy
• Ship tools that accelerate the growth of new qualified contributors on Scale's platform
• Build fraud-detection systems that remove bad actors and keep Scale's contributor base safe and trusted
• Use models to estimate the quality of tasks and contributors, and guarantee quality on requests at large scale
• Devise advanced matching algorithms that pair contributors to customers for optimal turnaround and accuracy
• Create optimized and efficient UI/UX tooling, in combination with ML algorithms, for 100k+ contributors completing billions of complex tasks
• Develop new AI infrastructure products to visualize, query, and explore Scale data

Requirements

• A graduation date in Fall 2027 or Spring 2028 with a Bachelor's degree (or equivalent) in a relevant field (Computer Science, EECS, Computer Engineering, Statistics)
• Available for a Summer 2027 internship (May/June start dates) in San Francisco
• Product engineering experience such as building web apps full-stack, integrating with relevant APIs and services, talking to customers, figuring out 'what' to build and then iterating
• Previous Computer Science/Software Engineering internship experience
• Track record of shipping high-quality products and features
• Experience building systems that process large volumes of data
• Experience with Python, Typescript, React, and/or MongoDB

Nice to Have

• Hands-on experience with LLMs, evaluations, or agentic systems - whether from coursework, research, or personal projects
• Open source contributions or a portfolio of shipped side projects

How We Work

Our credos shape how we make decisions and work as a team:

• Earn Customer Love - trust is earned with every interaction, every delivery, and every problem we solve
• Team Flow - ideas, energy, and support move freely across teams; optimize for the whole
• Quality is Our Cheat Code - the systems that deliver quality consistently are a structural advantage
• Find the 20% - find the inputs that drive the outcomes and execute them completely
• Write the Market - our research puts us at the frontier, and we bring our partners there first
• Three Moves Ahead - consider the consequences of consequences, and plan accordingly

PLEASE NOTE:Our policy requires a 90-day waiting period before reconsidering candidates for the same role. This allows us to ensure a fair and thorough evaluation of all applicants.

About Us:

At Scale, our mission is to develop reliable AI systems for the world's most important decisions. Our products provide the high-quality data and full-stack technologies that power the world's leading models, and help enterprises and governments build, deploy, and oversee AI applications that deliver real impact. We work closely with industry leaders like Meta, Ernst & Young, Mayo Clinic, Time Inc., the Government of Qatar, and U.S. government agencies including the Army and Air Force. We are expanding our team to accelerate the development of AI applications.

We believe that everyone should be able to bring their whole selves to work, which is why we are proud to be an inclusive and equal opportunity workplace. We are committed to equal employment opportunity regardless of race, color, ancestry, religion, sex, national origin, sexual orientation, age, citizenship, marital status, disability status, gender identity or Veteran status.

We are committed to working with and providing reasonable accommodations to applicants with physical and mental disabilities. If you need assistance and/or a reasonable accommodation in the application or recruiting process due to a disability, please contact us at [e-mail]. Please see the United States Department of Labor's Know Your Rights poster for additional information.

We comply with the United States Department of Labor's Pay Transparency provision.

PLEASE NOTE: We collect, retain and use personal data for our professional business purposes, including notifying you of job opportunities that may be of interest and sharing with our affiliates. We limit the personal data we collect to that which we believe is appropriate and necessary to manage applicants' needs, provide our services, and comply with applicable laws. Any information we collect in connection with your application will be treated in accordance with our internal policies and programs designed to protect personal data. Please see our privacy policy for additional information.