Our Mission

Prose is truly custom hair and skin care made-to-order—just for you. Our line of custom products are made by an in-house, Paris-based R&D team of gifted chemists who combine natural ingredients in innovative ways alongside dermatologists, giving consumers clean skin care, hair care and impeccable results.

At the heart of Prose’s success is Singular, its proprietary AI-powered beauty-tech platform, which has revolutionized personalized beauty at scale. Marrying a technology-driven approach with an apothecary-style concept, all Prose hair and skin care products are personalized to your one-of-a-kind hair, skin, goals and environment.

We’re a company that wants to change beauty practices, so we’re changing the way beauty companies practice. As a certified B Corporation, a Public Benefit Corporation and Climate Neutral, we’re proving that good business is always sustainable. With Prose, there’s nothing sacrificed to bring you great products—not trees, materials, wages, or performance.

Prose & Singular in Numbers

• Founded in 2017, with hubs in Paris, New York, and Los Angeles

• 10M+ consultations completed

• 2M customers and 350K active subscribers

• 21M custom products made, with 1M+ unique formulas

• 350+ team members across disciplines

• $600M+ in lifetime sales, with $165M+ revenue in 2024

• Profitable since 2024

Discover our Company Culture on Welcome to the Jungle here

Discover our Company Mission & Vision in video here

Position Summary

At Prose, we create custom formulations tailored to each customer's unique needs. The Algo team plays a central role in this mission: we build and maintain the API that serves the models powering our main platform, enabling accurate product recommendations and personalized formulations. We also develop internal tools that support our R&D team in their search for the best formulation algorithms.

As a Software Engineer Intern on the Algo Team, you will contribute to improving the performance, reliability, and maintainability of the services behind our personalization engine. You will help optimize the latency and resource usage of our API endpoints, build tools that streamline R&D workflows, and ensure our model-serving infrastructure remains robust as we continue to innovate.

This role offers hands-on experience in backend engineering within a dynamic environment, where your contributions will have a visible impact on both internal teams and customer-facing features.

Key Responsibilities

API & Service Maintenance

• Maintain and enhance the API that serves our personalization and formulation models.

• Ensure high reliability, stability, and performance of our backend services.

• Collaborate with ML engineers to integrate new algorithmic features into production.

Internal Tools for R&D

• Develop and maintain Python tools that support the R&D team in exploring and validating new formulation algorithms.

• Automate recurring tasks and improve workflows

• Document tools to ensure ease of use and maintainability.

Performance & Optimization

• Contribute to load testing, monitoring, and observability improvements.

Engineering Best Practices

• Write clean, readable, maintainable Python code.

• Contribute to a well-tested codebase with unit tests, integration tests, and functional tests.

• Participate in peer reviews, continuous integration, and collaborative team discussions.

Key Candidate Requirements

• Comfortable with Python and motivated to grow as a backend engineer.

• Interest in APIs, backend systems, and performance optimization.

• A knack for writing clean, maintainable code.

• Eager to learn and implement automated testing.

• Familiar with Git, Unix shell, and standard developer tools.

• Good communication skills in French and English.

• Bonus (not required): Exposure to cloud environments (GCP), Docker, or monitoring tools.

Perks & Benefits

• Lunch voucher (Swile card) up to 9€ per day

• 50% reimbursement of the Navigo pass

• A great team atmosphere with team-building events, board game evenings, and more!

Prose Values

Intentional Inclusivity

• We know the best ideas come from open minds and willingness to listen. While our products cater to the individual, an invitation into our process is always open to our community.

• We value our differences and diverse backgrounds by communicating openly, managing with transparency and striving to understand one another’s perspective. It’s a key ingredient to our innovation.

Connected Collaboration

• Our strength as a group will outlast our efforts as individual contributors. With offices across countries (and across boroughs) staying inventive and agile deepens our clear vision and consistent communication.

• We stay in a spirit of entrepreneurial collaboration: We do not have consensus at all times, but we trust one another to work toward our common goals. Our success is an expression and result of our progressive and gratifying teamwork.

Driven, Together

• We value ownership and coaching that encourages employees to think constructively and creatively about the business. We view employees as leaders and individuals who are accountable, resourceful and responsible. Anyone and everyone is encouraged to lead.

• We recognize that in order to continue thinking one step ahead, we will need to try new things. We strive to provide an open environment that accepts this truth making space for new ideas to emerge.

Humanity Always

• We assume good intentions in every interaction keeping ourselves accountable for the climate we create. We seek to understand our co-workers through this lens of conscious bienveillance, authenticity and fellowship.

• We operate with the intention of preserving resources, creating an environment we can all live in — for our business and the world. Sustainable care is essential to our ethos as an organization. We take a mindful approach to how we think about our people (employees) and our planet.

Prose Values

Intentional Inclusivity

• We know the best ideas come from open minds and willingness to listen. While our products cater to the individual, an invitation into our process is always open to our community.

• We value our differences and diverse backgrounds by communicating openly, managing with transparency and striving to understand one another’s perspective. It’s a key ingredient to our innovation.

Connected Collaboration

• Our strength as a group will outlast our efforts as individual contributors. With offices across countries, staying inventive and agile deepens our clear vision and consistent communication.

• We stay in a spirit of entrepreneurial collaboration: We do not have consensus at all times, but we trust one another to work toward our common goals. Our success is an expression and result of our progressive and gratifying teamwork.

Driven, Together

• We value ownership and coaching that encourages employees to think constructively and creatively about the business. We view employees as leaders and individuals who are accountable, resourceful and responsible. Anyone and everyone is encouraged to lead.

• We recognize that in order to continue thinking one step ahead, we will need to try new things. We strive to provide an open environment that accepts this truth, making space for new ideas to emerge.

Humanity Always

• We assume good intentions in every interaction, keeping ourselves accountable for the climate we create. We seek to understand our co-workers through this lens of conscious benevolence, authenticity and fellowship.

• We operate with the intention of preserving resources, creating an environment we can all live in – for our business and the world. Sustainable care is essential to our ethos as an organization. We take a mindful approach to how we think about our people (employees) and our planet.