Full Stack Developer - Unique relationship with OAI

Cosine is a fully agentic SWE that allows you to instantly work on every single ticket at once, asynchronously.
$76,000 - $152,000
Frontend
Mid-Level Software Engineer
Hybrid
11 - 50 Employees
3+ years of experience
AI · Enterprise SaaS

Description For Full Stack Developer - Unique relationship with OAI

Cosine, a pioneering YC-backed startup founded in 2022, is seeking a Full Stack Developer to join their innovative team. The company specializes in fully agentic software engineering solutions, leveraging a custom model built specifically by OpenAI for their needs, making them the largest OAI customer for SFT.

The role offers a unique opportunity to work at the intersection of developer tools and artificial intelligence. As a Full Stack Developer, you'll be instrumental in building end-user products that enhance developer workflows using Cosine's proprietary LLM and AI technology. The position requires expertise in reactive applications using modern frameworks like React, Vue, and Rails, along with strong TypeScript and NextJS skills.

What makes this role particularly exciting is that you'll be building tools that you and your fellow engineers will use directly. This creates a unique feedback loop where you're both the developer and the end-user, ensuring a deep understanding of the developer experience you're crafting. The tech stack is modern and comprehensive, including React, TypeScript, Node.js, and various DevOps tools like AWS, Docker, and GitHub Actions.

The company offers a competitive compensation package ranging from £60K to £120K GBP, along with benefits including professional growth opportunities, flexible work arrangements, and access to cutting-edge AI technologies. The hybrid work model requires 3 days in the London office, providing a balance between collaborative in-person work and remote flexibility.

Cosine's unique position as a major OpenAI partner, combined with their mission to revolutionize developer workflows through AI, makes this an exceptional opportunity for a Full Stack Developer looking to work at the forefront of AI-powered developer tools. The role offers the perfect blend of technical challenges, innovative problem-solving, and the chance to shape the future of software development tools.

Last updated 8 hours ago

Responsibilities For Full Stack Developer - Unique relationship with OAI

  • Build end-user products (developer workflow tools) that use Cosine's LLM and AI tech
  • Build reactive applications that work across multiple platforms
  • Design and implement back-end APIs
  • Work on CI/CD pipelines and containerization
  • Implement and optimize testing (unit, integration, performance)

Requirements For Full Stack Developer - Unique relationship with OAI

React
TypeScript
Node.js
Python
Go
  • The ability to travel to our London office at least 3 days a week
  • Minimum of 3 years of professional experience in software engineering
  • Proven expertise in the programming language of your choice
  • Familiarity with AI technologies such as OpenAI, ChatGPT, Anthropic, ASTs, Github, Knowledge Graphs
  • Strong problem-solving skills and ability to work in a collaborative team environment
  • Excellent communication and interpersonal skills

Benefits For Full Stack Developer - Unique relationship with OAI

  • Competitive salary and benefits package
  • Opportunity for professional growth and career development
  • Flexible work schedule with a hybrid work model
  • Collaborative and innovative work environment
  • Access to cutting-edge AI technologies and projects

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