Founding Engineer

Weekday AI

San Francisco, California, United States permanent

Posted: August 28, 2025

Job Description

This role is for one of the Weekday's clients

Min Experience: 3 years

Location: San Francisco, US, San Francisco Bay Area

JobType: full-time

As a Founding Engineer, you’ll play a pivotal role in shaping the core product, engineering culture, and technical architecture from the ground up. This role demands creativity, ownership, and agility to solve complex problems end-to-end while building features that will be used by millions.

Requirements:
What You’ll Do

• Design and build core product experiences for web and mobile.
• Tackle challenging problems from start to finish — from intuitive camera interactions to distributed search pipelines or agent frameworks.
• Collaborate closely with the founding team to define product direction and architecture.
• Establish engineering best practices, culture, and processes from day one.

Application Engineering (Full-stack) Focus

• Build cutting-edge map-based and interactive user experiences for both mobile and web.
• Develop with TypeScript and React for web.
• Work with Swift (iOS) or Kotlin/Java (Android) for mobile platforms.
• Create delightful, pixel-perfect UIs optimized for performance in rich, dynamic environments.
• Contribute to backend systems in TypeScript, completing full end-to-end features.

Data / AI Engineering Focus

• Develop the intelligence powering product experiences — including search, agents, pipelines, and scalable data infrastructure.
• Work with Python and/or TypeScript across data pipelines and backend systems (Snowflake, DBT, Elastic, etc).
• Build AI-powered agents and applications leveraging LLMs.
• Handle systems at scale — whether high data volume or request throughput.
• (Bonus) Apply ML models for user experience enhancements such as media transformation, image tagging, personalization, or fine-tuning LLMs.

Skills & Experience

• TypeScript, ReactJS, React
• Kotlin, Java, Swift
• Python
• Strong foundation in end-to-end feature ownership and system design
• Ability to work independently on hard technical problems with speed and agility

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