Fall 2026

Applied Scientist / Research Engineer Intern

Posted on 7/21/2026

Mistral AI

Mistral AI

1,001-5,000 employees

Open-source LLM platform and API access

No salary listed

London, UK + 1 more

More locations: Paris, France

In Person

Paris or London offices; on-site work.

Category
AI & Machine Learning (1)
Required Skills
Python
Pytorch
RAG

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Requirements
  • Fluent English and clear communication skills with technical and non-technical audiences
  • Expertise in PyTorch or JAX
  • Confidence working independently with large codebases
  • Proficient in writing clean, efficient, and reliable Python code
  • Initiative to take ownership and deliver without heavy guidance
  • Collaborative attitude, low-ego, and willingness to keep learning
  • Demonstrated success through academic, professional, or personal technical projects
  • Experience or strong interest in areas like agents, multi-modality, robotics, diffusion models, or time-series analysis
Responsibilities
  • Run pre-training, post-training, and deploy advanced models on GPU clusters
  • Troubleshoot technical issues, including OOM errors and NCCL communication
  • Generate and curate data for all stages of model development and evaluation
  • Build tools and frameworks for data generation, model training, evaluation, and deployment
  • Collaborate with internal and external teams to apply AI to diverse use cases, including agent and retrieval-augmented generation pipelines
  • Manage communications and research project workflows with client teams
  • Ensure models regularly meet or exceed performance expectations

Mistral AI is a French company that develops open-source large language models and the tooling around them. It provides a platform where developers and businesses can access, customize, and deploy AI models to build new AI-powered products and services. The company has released models such as Mistral 7B and Mixtral 8x7B, the latter using a Mixture of Experts (MoE) architecture to balance performance and efficiency. Users interact with the models via an API or similar platform, and Mistral AI earns revenue by charging for access to its proprietary models and related services. What sets Mistral AI apart is its open-source approach and community-driven development, combined with expert leadership from former Google DeepMind and Meta AI researchers who bring deep AI research experience. The company’s goal is to empower businesses to create and deploy AI-driven solutions by providing accessible, efficient, and customizable AI models and tools.

Company Size

1,001-5,000

Company Stage

Debt Financing

Total Funding

$3.9B

Headquarters

Paris, France

Founded

2023

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Simplify Jobs

Simplify's Take

What believers are saying

  • Simulation training reduces token usage 22x, slashing training time from months to days for rapid deployment.
  • Hardware-agnostic Robostral Navigate expands addressable market by enabling existing robot fleets to adopt advanced navigation.
  • $3.4 billion fundraising round targeting $23 billion valuation signals strong investor confidence in physical AI pivot.

What critics are saying

  • Sim-to-real transfer gap will cause deployment failures in real factories due to lighting, reflections, and unexpected obstacles.
  • Open-weight model leakage will let competitors replicate 8x7B and Magistral Small capabilities without paying licensing fees.
  • ASML's 11% stake creates dependency risk; semiconductor export restrictions will stall Mistral's 200MW data center expansion by 2027.

What makes Mistral AI unique

  • Open-weight models under Apache 2.0 license enable unrestricted commercial use unlike proprietary US rivals.
  • Single-camera Robostral Navigate eliminates costly LiDAR and depth sensors while achieving 76.6% benchmark success.
  • Hardware-agnostic design allows deployment across any robot platform without custom engineering or hardware replacement.

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Benefits

Health Insurance

Company Equity

Parental Leave

401(k) Retirement Plan

Paid Vacation

Growth & Insights and Company News

Headcount

6 month growth

4%

1 year growth

1%

2 year growth

8%
Lifevest Advisors
Jun 21st, 2026
Different game, or already lost? Reading Mistral's sovereignty bet.

Different game, or already lost? Reading Mistral's sovereignty bet. Analyzing whether Mistral's shift to full-stack AI and on-prem solutions signals strategic insight or an admission of losing the frontier-model game. Up next. Published on 21 June 2026 Mistral presented itself as a full-stack AI provider at its Paris summit, emphasizing on-prem solutions and specialized small models. Critics question whether this strategy reflects genuine innovation or a sign of having fallen behind in large-model development. Mistral has publicly repositioned itself as a full-stack AI provider, emphasizing enterprise-focused on-prem solutions and specialized models, during its recent AI Now Summit in Paris. This marks a significant strategic shift from its previous focus on developing large models, raising questions about whether the move indicates genuine innovation or a response to falling behind in frontier-model development. During the summit, Mistral CEO Arthur Mensch stated that the company aims to own the entire AI stack - from compute infrastructure to models and platforms - to better serve regulated European markets. The company owns a 40MW data center near Paris and plans to expand to 200MW by 2027, including a €1.2 billion facility in Sweden. Mistral introduced Vibe for Work, an agentic assistant targeting enterprise applications, and highlighted partnerships with companies like ASML, BNP Paribas, and Amazon. The company's core value proposition is offering customizable, open models that clients can run on their own infrastructure, a feature that distinguishes it from closed-API providers like OpenAI. However, critics note the absence of new model announcements or technical breakthroughs, which raises doubts about Mistral's technical competitiveness. The company's enterprise focus is exemplified by clients like BNP Paribas and Abanca, which use Mistral models on-prem for sensitive data processing, aligning with European regulatory needs. The debate continues whether this on-prem approach provides a sustainable competitive advantage or is a strategic retreat due to limitations in large-model capabilities. Mistral also champions small, purpose-built models for efficiency in production environments, arguing they outperform larger models in speed and cost for specific tasks. The summit's highlight was a demonstration involving ancient texts, illustrating the potential of specialized models, but it also underscored the ongoing debate about the future of AI model scaling and deployment. ThorstenMeyerAI .com AI & Tooling · Field Note Mistral · AI Now Summit, Paris Different game, or already lost? Mistral now pitches itself as Europe's full-stack AI provider - compute, models, platform, consultancy - not a frontier-model lab. Is that a real strategic insight, or making the best of a race it can't win? Both readings fit the same facts. A genuinely two-sided question · held both ways enterprise AI on-prem server. As an affiliate, Lifevest Advisors earn on qualifying purchases. Discover more Business & Corporate Law small AI models for business. customizable open AI models. AI data center hardware. As an affiliate, Lifevest Advisors earn on qualifying purchases. ThorstenMeyerAI .com Sources: Koen van Gilst's AI Now Summit notes & the Hacker News discussion · Mistral summit materials · VentureBeat · TechCrunch · Data Center Dynamics · Austrian Academy of Sciences. Figures current as of late May 2026 · independent commentary, not affiliated with Mistral. Implications of Mistral's full-stack shift for AI industry. Mistral's pivot to a full-stack, enterprise-focused approach could reshape how AI providers compete, especially in regulated markets like Europe. If successful, it may challenge the dominance of US-based closed-API giants by emphasizing local infrastructure, customization, and compliance. Conversely, critics argue that this strategy might be a sign of falling behind in large-model innovation, risking obsolescence if the frontier-model race continues to accelerate elsewhere. The outcome could influence industry standards on model deployment, data sovereignty, and the viability of small, specialized models versus large, general-purpose ones, affecting enterprise adoption and AI ecosystem dynamics. Mistral's transition from model developer to full-stack provider. Founded as a model-focused startup, Mistral gained recognition for its small, efficient models and enterprise applications. The company's recent summit signals a strategic shift toward owning the entire AI stack, including infrastructure, to better serve European clients with strict data sovereignty and regulatory requirements. This move comes amid a broader industry trend where major players like OpenAI and Anthropic focus on large, general-purpose models delivered via API. Critics have questioned whether Mistral's emphasis on small models and on-prem deployment is a strategic advantage or a sign of lagging behind in frontier AI development. The company's partnerships with European firms and its investment in infrastructure highlight its commitment to localized AI solutions, but the lack of new model breakthroughs raises questions about its technical competitiveness. "To deploy AI in the enterprise, you actually need to own the full stack." - Arthur Mensch, CEO of Mistral Unclear outcomes of Mistral's strategic shift. It remains uncertain whether Mistral's focus on full-stack, on-prem solutions and small models will lead to sustained competitive advantage or if it signifies a retreat due to technical limitations in large-model development. The company's ability to attract major enterprise clients and compete with US and Chinese AI giants in innovation and scale is still to be proven. Additionally, the long-term impact of European data sovereignty priorities on Mistral's growth remains unclear. Next steps for Mistral and industry adoption. Mistral is expected to continue expanding its infrastructure and client base, with upcoming model releases and platform enhancements. Industry observers will watch whether the company can deliver technical breakthroughs or maintain its niche through enterprise and regulatory advantages. Further, the broader AI community will assess if small, specialized models can replace or complement large models in production environments, influencing future industry standards and competitive dynamics. Key questions. Is Mistral still developing large models? It is not yet clear whether Mistral is actively developing large models or focusing solely on specialized, small models for enterprise use. The company emphasized infrastructure and enterprise solutions during the summit, with little mention of new large-model breakthroughs. Does Mistral's strategy give it a competitive edge in Europe? Mistral's focus on on-prem solutions, data sovereignty, and customized models may appeal to European enterprises with strict regulatory requirements, potentially offering a competitive edge over US-based API providers. However, whether this translates into long-term success remains uncertain. Can small models outperform large models in practical applications? Industry experts argue that small, purpose-built models can be more efficient in specific tasks, especially in production environments where speed and cost matter. However, for complex reasoning tasks, large models still hold an advantage. Will Mistral's approach influence global AI standards? It is too early to tell, but if Mistral's enterprise and on-prem focus prove successful, it could encourage other providers to adopt similar localized, customizable strategies, especially in regulated markets. This content is for general information only and is not financial, tax or legal advice. Consult a qualified professional for decisions about your money.

Internet Info Agency
Jun 13th, 2026
Mistral AI seeks €3B funding at €20B valuation.

Mistral AI seeks €3B funding at €20B valuation. From:Internet Info Agency 2026-06-13 09:57:00 European AI startup Mistral AI is in early talks with investors for a new funding round, aiming to raise €3 billion at a valuation of approximately €20 billion. Headquartered in France, the company completed its Series C round in September 2025, raising €17 billion at a pre-money valuation of €10 billion, with ASML leading the round by investing €13 billion. Mistral AI has partnered with Airbus to advance AI applications in sovereign aerospace and is collaborating with BMW to develop industry-specific AI models for crash simulation. These partnerships underscore the company's technical capabilities and market potential. Editor:NewsAssistant

voco Hotels by IHG
May 31st, 2026
Claude Opus 4.8: Anthropic's honest, powerful AI upgrade.

Claude Opus 4.8: Anthropic's honest, powerful AI upgrade. 5h ago · 0:00 listen · Source: Substack Summary. Anthropic has released Claude Opus 4.8, an upgraded AI model offering stronger performance in coding and professional tasks. This new version is significantly more honest, flagging uncertainties and less likely to make unsupported claims. Opus 4.8 achieves state-of-the-art results, scoring 1890 on GDPval-AA for knowledge work and 69.2% on SWE-Bench Pro. Anthropic also introduced dynamic workflows for large tasks, where Claude breaks down complex prompts into subtasks and uses parallel sub-agents. Meanwhile, OpenAI launched Rosalind Biodefense, giving trusted developers access to GPT-Rosalind for defensive biology work like epidemiological modeling. Mistral introduced Search Toolkit, an open-source framework to streamline search pipelines for AI applications. Mistral also launched Vibe, its new live agent product and main AI interface, replacing LeChat, which includes a Work Mode and a Code Mode. These advancements show a continued push for more capable and reliable AI tools across various fields. This is an AI-generated audio summary. Always check the original source for complete reporting.

Mistral AI
May 28th, 2026
Mistral AI raises $1.9B at $13.2B valuation, led by ASML to advance frontier AI research

Mistral AI has raised €1.7 billion in a Series C funding round at an €11.7 billion post-money valuation. The round was led by semiconductor equipment manufacturer ASML Holding, with participation from existing investors including DST Global, Andreessen Horowitz, Bpifrance, General Catalyst, Index Ventures, Lightspeed and NVIDIA. The Paris-based AI company will use the funding to advance its scientific research and develop custom decentralised frontier AI solutions for complex engineering and industrial problems. ASML CEO Christophe Fouquet said the partnership aims to generate benefits for ASML customers through AI-enabled products and solutions. Mistral AI CEO Arthur Mensch stated the investment will help address engineering challenges in the semiconductor and AI value chain whilst maintaining the company's independence.

EDF
May 28th, 2026
EDF and Mistral sign a partnership agreement for AI serving nuclear power and digital sovereignty.

EDF and Mistral sign a partnership agreement for AI serving nuclear power and digital sovereignty. Published on 2026/05/28 Paris, May 28, 2026. EDF and Mistral announce the signing of a partnership agreement aimed at collaborating in the field of artificial intelligence to enhance the Group's efficiency and performance in its engineering, maintenance, and construction activities for future EPR2 reactors. Concluded for a duration of five years, this partnership will enable both companies to work on the development and deployment of artificial intelligence tools tailored to EDF Group's safety, industrial performance, and regulatory requirements. The data will remain the property of EDF and will be hosted on trusted infrastructures (sovereign cloud or EDF data centers). The results of this collaboration are intended to provide concrete support to field teams by improving responsiveness, efficiency, and operational performance. The partnership notably plans to train conversational agents capable of querying the "technical memory" accumulated across the entire French nuclear fleet and EDF construction sites, while complying with the safety, security, and sovereignty requirements inherent to these operations. This support for teams will facilitate industrial maintenance operations as well as access to knowledge for nuclear engineering and will optimize activities on construction sites under the EPR2 program. The AI tools envisioned as part of this partnership will not concern nuclear plant control systems. Arthur Mensch, CEO and co-founder of Mistral, stated: "This partnership with EDF illustrates the importance of independent AI in addressing critical nuclear challenges. We are deploying our cutting-edge solutions and expertise within their environment and adapting them to their industrial context. This is to enable nuclear professionals to perform more effectively in their daily work thanks to AI, while fully complying with the strictest safety and security requirements." Bernard Fontana, Chairman and CEO of EDF Group, added: "This partnership with Mistral AI strengthens our digital sovereignty by developing AI designed as closely as possible to our core activities, leveraging our data assets and hosted on trusted infrastructures. The objective is clear: to use AI to improve operational efficiency while ensuring safety, security, and quality."