Founding Engineer

About Us

Isidor is building the foundation of reliable AI. We believe that the next leap in AI depends as much on understanding and measuring model behavior as it does on model size. To make AI trustworthy, we need systems that verify outputs, benchmark performance, and automate evaluation across billions of examples.

Isidor was founded by engineers and researchers who care deeply about precision, transparency, and scientific rigor. We are a small, fast-moving team working directly with frontier AI labs and enterprise to make evaluation as measurable and reproducible as training itself. 

Founded in September 2025, Isidor raised an oversubscribed $3.6m pre-seed from leading funds including Gradient Ventures, futurepresent and Seedcamp, along with angels from Google DeepMind, Perplexity, Motive, Episode 1 and more. 

 

The Role

As a Founding Engineer, you’ll own the architecture that defines how AI reliability is measured, from scalable backend systems to forward deployed pipelines and client-facing APIs.

You will:

• Design and build the core infrastructure for data ingestion, evaluation, and benchmarking at scale
• Implement automated pipelines that measure model reliability, and evaluation metrics
• Lead DevOps and cloud automation 
• Collaborate directly with AI research labs and enterprise clients
• Contribute to the company’s technical direction, culture, and engineering standards from first principles

What We’re Looking For

• 1-5 years building and scaling backend systems, strong experience with front end
• Understanding of cloud infrastructure (AWS, GCP)
• Expertise in DevOps, CI/CD, and performance tuning
• Experience building end-to-end systems from scratch
• Proven collaboration record with small teams, wearing many hats

Bonus points if you have:

• Built large-scale ML evaluation or annotation platforms
• Designed metrics pipelines for AI workflows
• Experience in AI research teams or startups to design technical infrastructure
• A strong appetite for a fast paced environment requiring initiative and ownership

Why Join Us

Your work will directly influence the development of the next generation of AI models, giving you the opportunity to make an outsized impact on frontier research and implementation in enterprise. 

Our momentum: 0 → 7 figures in revenue in <1 month

Backed by: Gradient Ventures, futurepresent, Seedcamp, along with angels from Google DeepMind, Perplexity, Motive, Episode 1 and more

Details

Location: Isidor is currently based in London (in-person) but relocating to San Francisco in Q1 2026 (with visa support for non-US citizens). Remote/hybrid arrangements can be made for exceptional candidates until full-time, in-office work in San Francisco. 

Compensation: Base salary: $150k – $300k; Equity: 0.5-1.5%

 

Benefits

• Relocation package
• Housing bonus (if within 3 miles of the office)

 

Please reach out with any questions to founders@isidor.ai