Extend
Software Engineer
New York City · Full-time · Posted Jan 22, 2026
- Experience
- 3+ years of professional software engineering experience; internships and part-time roles count.
About the job
Build Extend’s core platform for configuring, testing, and deploying LLM-powered document processing, including scalable systems and human–AI product interfaces.
What you'll do
- Build and maintain durable, scalable systems that process tens of millions of data points per month.
- Design and implement interfaces for designing and understanding document processing.
- Own product and engineering work, collaborate with customers and founding team members, and help build the team.
What they ask for
- Strong foundational understanding of computer science principles, demonstrated through coursework, personal projects, internships, or prior work.
- 3+ years of professional software engineering experience; internships and part-time roles count.
- Enthusiasm for building high-quality, user-facing products and interest in working across the stack.
- Ability to learn quickly, take ownership, and work independently when needed.
Nice to have
- Interest in AI/ML technologies and curiosity about building products powered by LLMs.
Tools
LLMs
AI focus
Build LLM-powered document processing, human–AI interfaces, and systems that help enterprises deploy document processing in production.
Model-written summary · the original posting is authoritative