Product Engineer - FullStack JS/TS

Cosine, a YC-backed startup founded in 2022, is revolutionizing software development with their fully agentic SWE platform that enables developers to work on multiple tickets simultaneously and asynchronously. They're seeking a Product Engineer specializing in Full-Stack JavaScript/TypeScript development to join their growing team of 12 people.

The role offers an exciting opportunity to work on cutting-edge developer workflow tools powered by Cosine's LLM and AI technology. As a Product Engineer, you'll be building reactive applications using modern technologies like React, NextJS, and TypeScript, while also handling backend development and API design. The position requires a unique blend of frontend expertise and backend capabilities, with a strong focus on developer experience.

The ideal candidate will bring 4+ years of professional software engineering experience, with deep knowledge of reactive applications, testing methodologies, and DevOps practices. You'll be working with state-of-the-art AI technologies, including OpenAI, ChatGPT, and Anthropic, while contributing to knowledge graphs and retrieval augmented generation systems.

Based in London with a hybrid work model (3 days in office, 2 days remote), this role offers a competitive salary range of £60K - £120K, along with comprehensive benefits. You'll be joining a collaborative and innovative environment where you can directly impact the product while working alongside the founders of a promising YC-backed startup.

The company values professional growth and provides access to cutting-edge AI technologies and projects. If you're passionate about developer tools, have a strong technical background, and want to be part of shaping the future of software development, this role at Cosine presents an excellent opportunity to make a significant impact while advancing your career.