New York, NY Senior Software Engineer at Eino

We are hiring a Backend-leaning Full-Stack Software Engineer with strong Python expertise and the ability to contribute across the stack when needed (React/TypeScript). You'll work closely with our founding engineering team-particularly our current backend lead to take ownership of backend systems that power our digital twin engine and AI-driven pipelines.

This role is ideal for someone who thrives in early-stage startup environments, learns fast, wants wide scope and impact, and sees engineering as a craft-not just a job.

• Own major components of our backend systems, with the goal of becoming the primary owner of the backend over time.
• Build performant, production-grade backend features in Python.
• Work with geometry, spatial data, simulation data, and large datasets.
• Contribute to frontend components in React + TypeScript when needed (light/medium complexity).
• Collaborate on data pipelines, GPU-related workflows, and LLM/AI-driven functionality.
• Work across backend, frontend, and infrastructure in true startup fashion.
• Ship fast while maintaining high engineering judgment-balancing speed, quality, and minimal viable complexity.
• Work onsite in our Williamsburg, Brooklyn office 4 days/week (5 optional).

• 5-10 years of experience preferred (exceptional 3+ years considered).
• Strong backend engineering experience with Python.
• Experience with geometric, spatial, or simulation-related data is a strong plus.
• Experience with GPU computing, LLM/agentic systems, or data-heavy pipelines is a plus.
• Comfortable contributing to frontend codebases using React + TypeScript.
• Some exposure to infrastructure (cloud, CI/CD, containers, DevOps basics) is a plus.
• Preferably holds a Computer Science degree; CE or EE also acceptable.
  Bootcamp-only or non-technical degrees are not a fit for this particular role.

• Has worked at a seed-stage or Series A startup and understands startup velocity.
• Hungry, curious, and not afraid to dive into new technology-even if you've never touched it before.
• Learns fast, asks the right questions, and figures things out.
• Wants to own systems end-to-end, not just complete tickets.
• Thrives in ambiguity and builds with a product-driven mindset.
• Wants to be part of a tight, highly skilled team where engineering is central to the company.

Candidates from the following areas tend to be a strong match:

• Wireless engineering
• Software for physical infrastructure / real-world modeling

Eino is building the world's first Connectivity Digital Twin- a deeply technical, AI-driven simulation platform that models real-world environments and their connectivity layers.

We are a real AI company: not LLM-wrapper tooling, but deep tech. Our work spans geometry processing, spatial reasoning, GPU-accelerated simulation, data modeling, and agentic AI systems. Every engineer at Eino works on highly challenging problems and collaborates with a team of exceptional, experienced builders.

We are well-funded by strong investors, have real customers, and a clear roadmap to reshape how the world understands connectivity.

This is a rare opportunity for a hungry, entrepreneurial engineer to join a rocket-ship Seed/Series A startup at the ground level, help architect the core backend, and grow into the owner of critical product infrastructure.