---
title: 'Intern at Isidor'
canonical: 'https://feeny.ai/job/intern-isidor-london-tzxbygtet32h'
type: 'job'
last_seen: '2026-09-05'
---

# Intern at Isidor

- **Company:** Isidor
- **Location:** London, United Kingdom
- **Posted:** 2025-12-22
- **Last confirmed live:** 2026-09-05
- **Apply:** https://job-boards.greenhouse.io/isidor/jobs/4088021009

## Job description

Isidor is looking for an intern to join our London office (Soho) for immediate start, full-time, in-person. Required background is in investment banking and/or private equity (at minimum, internship experience at top-tier institutions). Excellent financial modelling skills are necessary.

- Key terms:

- Start: Dec-2025 / early Jan-2026 (as soon as possible)

- Duration 3-6 months (flexible)

- Pay: $6,500 pcm

## 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.

Website: [www.isidor.ai](http://www.isidor.ai)

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, KKR, Balyasny, Perella Weinberg and more.

## About Isidor

## Company Overview
- **One-liner**: Isidor develops secure, vertically-integrated pipelines that transform raw, unstructured enterprise data into reinforcement-learning-ready curricula for model training, evaluation, and alignment.
- **Entity Type**: Private (Pre-Seed; raised $3.6M)
- **Headquarters**: San Francisco, California, United States (with a London office)
- **Founded**: September 2025
- **Founders**: Andrew M. (CEO & Co-Founder), Antonios Valkanas (Co-Founder & CTO), François V. (Co-Founder)

## Core Business
- **Primary Industry**: Artificial Intelligence / Enterprise AI infrastructure
- **Target Customers**: B2B – frontier AI labs and large enterprises needing secure, custom model training and evaluation pipelines
- **Mission / Purpose**: “Building the foundation of reliable AI” – making AI trustworthy by verifying outputs, benchmarking performance, and automating evaluation at scale.

## Products & Services
- **Reasoning Trace Data**: Captures complex workflows and reverse-engineers them from the ground up for model training.
- **Foundation Model Post-Training**: Fine-tuning and alignment on proprietary enterprise data and internal practices.
- **Verifiers**: Post-processing systems for generative AI outputs, tailored to critical enterprise processes.
- **Evaluation**: State-of-the-art benchmarks for specialized industry verticals, paired with best-in-class agentic evaluations.
- **Data Pipelines & Infrastructure**: Custom data ingestion, cleaning, and processing pipelines designed for reinforcement learning and evaluation workflows.

## Market Standing
- **Valuation / Market Cap**: Not disclosed
- **Key Metric**: Total Funding – $3.6M pre-seed (oversubscribed). Revenue – reached 7 figures within the first month of operation, according to job postings.
- **Notable Investors / Partners**:
  - Lead investors: Gradient Ventures (Google’s AI fund), futurepresent, Seedcamp
  - Angels from Google DeepMind, Perplexity, Motive, Episode 1
- **Growth Signals**: Rapid revenue generation (0 → 7 figures in < 1 month); small team (approx. 4–5 employees as of early 2026) operating in both San Francisco and London; direct collaboration with top AI labs and enterprise clients.

## Competitive Advantages
- **Vertically-integrated, secure pipelines** that handle raw, unstructured data end-to-end – from capture to model training and evaluation.
- **Focus on reliability and measurement** – treats evaluation as a first-class, reproducible engineering discipline, not an afterthought.
- **Enterprise-grade privacy and compliance** built into the core infrastructure, appealing to regulated industries.
- **Direct access to frontier labs** and the ability to embed engineers with research teams.

## Strategic Focus
- **Current Priorities**: Scaling the engineering team (hiring Founding Engineers and Forward Deployed Engineers); deepening integrations with frontier AI labs; expanding enterprise adoption in sectors requiring high reliability.
- **Direction**: Shifting the AI reliability conversation from model size to verifiable behavior – making evaluation “as measurable and reproducible as training itself.”

## Why Work Here
- **Culture**: Tight-knit, fast-moving team of engineers and researchers who value precision, transparency, and scientific rigor. Emphasis on ownership and wearing many hats.
- **Work Policy**: Full-time, in-office in London (in-person), with potential relocation to San Francisco in H1 2026 (visa support provided).
- **Notable Perks**: Relocation package, housing bonus (if within 3 miles of the London office), competitive salary + equity.
- **Impact**: Direct influence on the development of next-generation AI models and frontier research; systems built here will be used by top AI labs globally.

## Sources
1. [isidor.ai](https://isidor.ai)
2. [linkedin.com](https://www.linkedin.com/company/isidorai)
3. [greenhouse.io - Founding Engineer](https://job-boards.greenhouse.io/isidor/jobs/4050484009)
4. [greenhouse.io - Forward Deployed Engineer](https://job-boards.greenhouse.io/isidor/jobs/4048584009)
5. [tracxn.com](https://tracxn.com/d/companies/isidor/__q4sE2KpzZy8wPYa4CaLlV-3Kn19uHl7GBvMOIIrYD_U) *(Note: Tracxn lists Isidor as “unfunded,” conflicting with official job postings; we rely on the more recent and primary sources from the company.)*

## Other roles at Isidor

- [Open Application](https://feeny.ai/job/open-application-isidor-london-k8wtz4cn98zq) — London, United Kingdom
- [Founding Engineer](https://feeny.ai/job/founding-engineer-isidor-london-aew6376z4bsk) — London, United Kingdom
- [Forward Deployed Engineer](https://feeny.ai/job/forward-deployed-engineer-isidor-london-3zrhbf7hpk38) — London, United Kingdom
- [Intern](https://feeny.ai/job/intern-tower-research-capital-gift-city-pte2q446tt8w) — Gift City, India
- [Intern](https://feeny.ai/job/intern-connectwise-sydney-dx0xbekckn46) — Sydney, Australia
- [Intern](https://feeny.ai/job/intern-nibiru-remote-8hnhfpg8810b)
- [Intern](https://feeny.ai/job/intern-novaspace-brussels-3kk3cyx5kbgf) — Brussels, Belgium
- [Intern](https://feeny.ai/job/intern-waterfall-y2pc7bbbwqx6)
- [Intern](https://feeny.ai/job/intern-enpal-berlin-hj53twtdjfq8) — Berlin, Germany