Backend Engineer - Astra

Company Description

Wix makes it possible for anyone to succeed online. Since 2006, we’ve grown to around 5,500 employees in 22 countries, launched over 40 products, and serve over 243 million users and their visitors worldwide. At Wix, we push you to innovate, evolve in non-traditional ways, and collaborate. We operate in small teams that work closely together at a high level.

Although we’re already industry leaders in web creation and business, our work is nowhere near done. Our goal is to become the main engine of the Internet so we can create a more open web for all.

We're proud to be an equal opportunity employer. Wix was built around the idea that everyone has the right to be successful, online. This same vision defines us as an employer: creating a work environment where everyone is welcome, and anyone has the right to succeed.

Job Description

As a Backend Engineer on our team, you'll focus on building and improving Astra Nova, the internal AI-powered development assistant that serves Wix's development teams. You'll develop advanced LLM-based solutions for both offline and AI-Human pair programming workflows. In your day-to-day, you will:

Design and implement advanced prompting strategies utilizing multiple LLM architectures, including sophisticated chains, few-shot learning, and Chain-of-Thought techniques, to enable code analysis and generation at scale across Astra's features

Develop sophisticated AI workflows combining various LLM providers (Anthropic, META, Google, OpenAI) to power intelligent code understanding, generation, and review automation

Build advanced context-aware AI agents for both interactive and headless modes, supporting the full development lifecycle from coding to PR reviews and repository maintenance

Research and implement cutting-edge LLM techniques to continuously improve Astra's capabilities, focusing on code understanding accuracy, generation quality, and system reliability

Design and implement advanced RAG techniques for efficient code context retrieval and knowledge integration across multiple repositories

Qualifications

5+ years of software development experience

2+ years of hands-on experience with LLMs and prompt engineering

Strong programming skills in TypeScript and/or Python for AI application development

Experience with modern AI frameworks and tools and a deep understanding of different LLM architectures and their capabilities

Strong technical writing and communication skills

Background in computer science or related field, experience with data science and classical ML techniques or knowledge of NLP fundamentals and transformer architectures - an advantage

Additional Information

We are Wix’s AI development assistant team, a small group of backend and frontend developers united by our passion for AI and our vision to revolutionize software development. We’re building Astra Nova - an innovative AI-powered solution that is transforming how Wix’s 2,000 engineers work with code, in both offline and AI-Human pair programming scenarios. Our mission is ambitious: to make engineers 10x more productive by fundamentally changing how software development is done at Wix. Our team is developing cutting-edge LLM applications that integrate directly into developers’ workflows to enhance productivity and code quality across Wix’s engineering organization.