Founding Software Engineer (Accel/Index) jobs in United States
cer-icon
Apply on Employer Site
company-logo

Day One Partners · 10 hours ago

Founding Software Engineer (Accel/Index)

Day One Partners is a search firm that partners with venture capital firms to help build high-growth startups. They are seeking a Founding Software Engineer to architect and ship core messaging infrastructure, focusing on human-AI collaboration and building a developer platform that is user-friendly.

Staffing & Recruiting
Hiring Manager
Maxwell Feinberg
linkedin

Responsibilities

Architect and ship core messaging infrastructure that feels instant, reliable, and magical
Focus on the invisible but critical layers — from retrieval and evaluations to performance optimization
Prototype new interaction patterns for how humans and AI agents work together
Build an API and developer platform that outside builders genuinely love using
Experiment with tool calling and retrieval systems to find what works in practice
Raise the bar for engineering craft, contribute to recruiting, and help define a world-class culture
Use our product daily, give direct feedback, and help turn insights into tangible improvements

Qualification

AI-powered applicationsSoftware engineeringProduct senseAttention to detailFast-paced work

Required

3+ years of professional software engineering experience, with at least 1 year in a senior IC role
Proven experience building or scaling AI-powered applications
Ability to move fast without compromising quality
Strong product sense and attention to the small details that make great software exceptional

Company

Day One Partners

twitter
company-logo
Like the startups we partner with, we're fresh, innovative, and poised for high growth.

Funding

Current Stage
Early Stage
Company data provided by crunchbase