- Full Time
- London
Isidor
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
Employment Type: Full time, in-office
Location: London (in-person), with potential for relocation to San Francisco in H1 2026 (with visa support)
Compensation: Competitive salary + equity
Benefits
- Relocation package
- Housing bonus (if within 3 miles of the office)
Please reach out with any questions to founders@isidor.ai
To apply for this job please visit job-boards.greenhouse.io.
Terms used in this posting
- equity
- Ownership stake in the company, usually in the form of stock options or RSUs, offered in addition to salary.
Explore Isidor online
Working in London, UK
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London is the capital and largest city of England and the United Kingdom, with a population of 9.1 million people in 2024. Its wider metropolitan area is the largest in Western Europe, with a population of 15.4 million. London stands on the River Thames in southeast England, at the head of a 50-mile (80 km) tidal estuary down to the North Sea, and has been a major settlement for nearly 2,000 years. Its ancient core and financial centre, the City of London, was founded by the Romans as Londinium and has retained its medieval boundaries. The City of Westminster, to the west of the City of London
England is a country that is part of the United Kingdom. It is located on the island of Great Britain, of which it covers about 62%, and more than 100 smaller adjacent islands. England shares a land border with Scotland to the north and another land border with Wales to the west, and is surrounded by the North Sea to the east, the English Channel to the south, the Celtic Sea to the south-west, and
- Elevation 18m (59 ft)
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