Back End Developer

Underdog.io -Apply to top tech jobs in 60 seconds. A place where companies apply to you; United States; Hybrid; USD 100,000 - 150,000; Full time

Job summary

A stealth-mode startup in the United States is looking for a Back End Developer to leverage AI technology in transforming software development. As an early employee, you will work closely with founders and have significant ownership. This full-time position is ideal for a developer with deep expertise in Python or Node.js, experience with LLM APIs, and a passion for innovation. Enjoy a fast-paced, agile work environment with opportunities for outsized returns as the company grows.

Qualifications

• Deep expertise in building robust and scalable backend systems and microservices.
• Hands-on experience with LLM APIs and passion for AI in software development.
• Ability to identify gaps and drive solutions proactively.

Responsibilities

• Build MVPs quickly and evolve them into scalable services.
• Leverage AI technologies to implement innovative features.
• Architect backend systems to handle real-world traffic.
• Establish engineering best practices and culture.

Skills

Python or Node.js

LLM APIs

Prototyping

Problem-solving

Self-starter

Job description

Back End Developer – AI‑Driven Development. Join our Y Combinator‑backed stealth‑mode startup building AI technology to transform how software is developed.

Why This Role is Exciting

• Founding Team Impact: Be an early employee. Work shoulder‑to‑shoulder with the founders to shape product vision, technical architecture, culture, and stack from the ground floor.
• YC Warp Speed: Experience the intensity of building within the Y Combinator ecosystem—rapid iteration, constant learning, and pivotal decisions daily.
• Meaningful Ownership: Receive significant early‑stage equity, turning your contributions into tangible value.
• Immediate & Visible Impact: See your code move the needle fast—ship, break, fix, ship again, often within the same day.
• Cutting‑Edge AI: Pioneer how Large Language Models (LLMs) can automate and optimize software creation.

Who You Are

• Python or Node.js Expert: Deep expertise building robust, scalable backend systems and microservices.
• AI & Code Generation Experience: Hands‑on with LLM APIs (OpenAI, Anthropic, etc.) and passion for applying AI to code generation and developer workflows.
• Hacker Mentality: Thrive on diving headfirst into complex problems, rapidly prototyping, reading docs on the fly, and iterating relentlessly.
• Self‑Starter: Identify gaps, seize opportunities, and drive solutions without waiting for direction.

What You’ll Do

• Spearhead Rapid Prototyping: Build MVPs quickly and evolve them into scalable, production‑grade services.
• Champion AI Integration: Leverage LLMs and other AI technologies to prototype and implement innovative code‑generation and productivity features.
• Build for Scale & Reliability: Architect, develop, and deploy backend systems that handle real‑world traffic with performance, stability, and resilience.
• Full‑Stack Founder (Spirit): Dive deep across the stack—architecture, AI integration, API design, and infrastructure—to ship transformative features.
• Define the Foundation: Establish engineering best practices, tooling, and culture for a growing technical team.

Why This Opportunity

• Founder‑Level Influence: Technical decisions directly shape the company’s trajectory.
• Revolutionary Impact: Contribute to a product poised to change developer workflows with cutting‑edge AI.
• Zero Bureaucracy: Operate in an agile, lean environment focused solely on building and shipping.
• Equity Potential: Genuine opportunity for outsized returns as we grow.
• YC Intensity: Accelerated growth, network, and challenge.

Ready to Build the Future?

If you’re a brilliant, driven engineer who thrives on velocity, craves massive ownership, and is passionate about leveraging AI to redefine development, this is your calling. Step out of the corporate machine and build something monumental from the ground up.

Job Details

• Seniority level: Mid‑Senior level
• Employment type: Full‑time
• Job function: Information Technology
• Industries: Software Development
• Boni: Located in San Francisco Bay Area or New York City