Thrive Capital Portfolio Careers

Founding Backend Engineer

Doji

Doji

Software Engineering
New York, NY, USA
Posted on Jun 10, 2025

The Opportunity

We're reimagining fashion shopping with AI avatars. To do this we're developing cutting-edge diffusion models and designing novel, personalized interfaces.

We're a small team of creative builders in NYC with a rare combination of taste and deep AI expertise. Previously we've shipped consumer products to millions at Apple, DeepMind, Meta, and startups. Backed by the investors behind OpenAI, Cursor, and SKIMS, our company is positioned at the intersection of AI, technology, and culture.

The Role

We're looking for a Founding Backend Engineer to build and optimize the core infrastructure that powers our AI fashion platform. This role is in-person from our office in NYC.

As Founding Backend Engineer you will...

  • Build scalable APIs that power our user-facing applications

  • Create efficient systems for managing and serving media assets at scale

  • Set up and maintain production infrastructure, monitoring, and deployment pipelines

  • Drive best practices in system design, coding standards and engineering excellence

  • Work directly with our founders to create industry-leading technology

  • Collaborate closely with our iOS team to ensure seamless backend-frontend integration

You're a great fit if you...

  • Have 5+ years of experience building backend services and APIs, with strong Python expertise

  • Have experience designing and optimizing complex database schemas and queries (PostgreSQL, Redis)

  • Have shipped and maintained production services from scratch, with a focus on reliability and performance

  • Are comfortable working with cloud services (AWS/GCP) and infrastructure orchestration tools (Kubernetes)

  • Have experience designing clean APIs and maintainable service architectures

  • Are self-driven, high-agency, have a collaborative mindset and eager to solve challenging technical problems

  • Have a genuine interest in AI/ML (direct experience not required), fashion, avatars or creative expression

  • Have experience with real-time communication protocols (e.g., WebSockets) and application development

Bonus if you...

  • Have built consumer products that handle significant scale

  • Are familiar with ML model serving and deployment

  • Have experience optimizing system performance and reliability

  • Have worked on mobile backends or with mobile application teams

  • Have experience with iOS-backend integration challenges