Python Jobs

Mistral AI

Mistral AI is seeking an Applied Scientist with deep expertise in engineering sciences to work at the forefront of AI-accelerated simulation. This role involves collaborating with industrial customers and internal research teams to build and deploy AI Physics Models, complementing our existing Large Language Models (LLMs). You will be involved in the entire process, from curating high-fidelity simulation datasets and training/evaluating models to delivering production-grade AI solutions directly to engineering teams. The target domains include computational fluid dynamics, structural mechanics, semiconductor design, multi-physics modeling, and digital twins. Working cross-functionally, you will ensure our models meet stringent engineering standards beyond just benchmark metrics.

Replit

The Anti-Abuse team at Replit is responsible for defending the platform from exploitation by detecting and preventing various forms of abuse, including phishing, cryptomining, LLM token farming, and malicious use of the platform. This role involves adversarial work, requiring the development of detection systems, heuristics, and automated responses to stay ahead of constantly adapting attackers. A unique aspect of this role is the AI-native nature of Replit's platform, presenting opportunities to build guardrails for AI-generated code, detect prompt injection attacks at scale, and leverage LLMs for defense. The position offers hands-on experience applying AI to security problems in a production environment with real attackers, with end-to-end ownership from identifying abuse patterns to shipping scalable solutions.

Mistral AI

Mistral AI is seeking an Applied AI Engineer to join its specialized unit focused on delivering high-impact, secure AI solutions for critical and sovereign institutions. This team works closely with clients in highly regulated environments to design, deploy, and maintain AI systems that meet stringent standards for reliability, security, and operational excellence. The role involves technical design, implementation, and deployment of AI solutions tailored to the unique needs of critical infrastructure and sovereign institutions, contributing directly to projects with significant societal and operational impact.

Abridge

Abridge is seeking Clinician Scientists to advance the development of its AI-powered clinical tools. This role requires a blend of deep clinical expertise and a background in AI, focusing on shaping AI-driven tools to ensure accuracy and quality for clinicians and patients. You will collaborate closely with engineers, researchers, product managers, and fellow clinicians to refine AI models, validate outputs, and create new functionalities that enhance documentation workflows.

Mistral AI

Mistral is seeking highly motivated Data Quality Specialists to join our Human Data Annotation team. This hybrid role involves reviewing and auditing code annotations against rubrics to ensure high-quality data for AI model training and evaluation. You will also be responsible for building, maintaining, and troubleshooting the internal tooling that annotators use daily. This position offers the opportunity to collaborate closely with annotators, technical program managers, and engineering stakeholders, contributing to the refinement of guidelines and processes that shape data production.

Reflection ai

Reflection is a research lab dedicated to making intelligence open and accessible. We build open-weight models that empower users to control their AI and shape its future. As a core member of the Applied AI team, you will drive model fine-tuning and evaluations for enterprise customers. This role involves adapting our open-weight models for specific customer domains, tasks, and constraints, working hands-on with customer data, running fine-tuning workflows, building evaluation harnesses, and deploying adapted models to production. You will collaborate directly with customers to understand their needs and with research teams to advance the possibilities of AI.

Mistral AI

Mistral AI is seeking a Research Engineer focused on Data Infrastructure to build and operate the next generation of our data systems. This role involves designing and scaling massive compute fleets and storage systems for high performance and scalability. You will contribute to a future of decoupled control and data planes, scaling big data compute and storage platforms while ensuring secure and governed data access for MLOps and research. The position requires full lifecycle ownership, from architecting migrations away from legacy orchestrators to implementing production-grade pipelines and participating in on-call rotations for critical training jobs.

Harvey

Harvey is transforming how legal and professional services operate by combining frontier agentic AI, an enterprise-grade platform, and deep domain expertise. This role offers a chance to help build a generational company at an inflection point, with strong product-market fit and investor support. The team moves fast, takes ownership, and is committed to the mission, operating with intensity and pushing for excellence. As a Product Backend Engineer, you will design and operate the backend systems that turn cutting-edge AI capabilities into seamless, dependable product experiences. You'll build secure, multi-tenant services, orchestrate interactions with LLMs and agentic tools, and help define the backend architecture that powers Harvey’s rapidly expanding product surface. Your work will have immediate business and customer impact as you ship the foundational systems behind our next generation of AI products.

Replit

Replit is seeking a skilled PSIRT Engineer to lead its vulnerability response program for its cloud-native AI platform. This role involves managing the entire lifecycle of security vulnerabilities, from intake and validation to remediation coordination and public disclosure. The ideal candidate will possess strong technical skills to reproduce vulnerabilities, a deep understanding of web, application, and cloud exploit classes, and experience with bug bounty and coordinated disclosure programs. You will collaborate closely with various engineering and security teams to ensure timely fixes and responsible communication.

Abridge

Abridge is seeking a Director of Data Science to build a world-class data team and implement a comprehensive data strategy that democratizes data in the age of AI. This role is crucial for providing insights, clarity, and speeding up decision-making across the company. The Director will collaborate closely with Product, Engineering, Science, commercial, and finance teams to guide strategic decisions and drive product strategy through data-driven insights.

Mistral AI

Mistral AI is a pioneering company democratizing AI through high-performance, open-source models and a comprehensive AI platform for enterprise needs. We are a dynamic, collaborative, and diverse team passionate about AI's potential to transform society. As an AI Deployment Strategist, you will drive the adoption and deployment of Mistral's AI solutions, working closely with customers from strategic vision to production implementation. This role sits at the intersection of business strategy, AI innovation, and hands-on deployment, ensuring our customers achieve transformative outcomes in cybersecurity.

Mistral AI

Mistral AI is seeking an Applied AI Engineer to join their team and facilitate the adoption of their products among customers. This role involves collaborating closely with clients from pre-sale to post-implementation, ensuring their solutions meet and exceed expectations. You will manage daily customer relations, acting as a key resource for externalizing research into production settings and driving the successful deployment of Mistral AI products. The position offers the opportunity to work on state-of-the-art Generative AI applications across various industries and contribute to a pioneering company shaping the future of AI.

WRITER is seeking a Deployment Engineer to join their team and help expand human capacity through superintelligence. In this role, you will partner directly with leading enterprise customers to understand their unique business challenges and architect AI-powered solutions using WRITER's platform and enterprise-grade LLMs. You will transform complex needs into tangible, high-impact applications, driving business results and shaping the future of work for major companies. This is a critical, influential role that directly impacts customer success and product evolution, contributing significantly to WRITER's mission.

Replit

Replit is seeking a Premium Support Engineer to be the primary point of contact for their highest-value customers, providing expert and timely technical support. This role involves handling complex product issues, guiding customers through critical incidents, and ensuring a high standard of quality and speed in all interactions. The engineer will play a key part in evolving support strategies, adapting to new products and customer expectations, and leveraging AI-assisted workflows. The position requires a blend of deep technical troubleshooting and clear, confident communication to keep users productive.

Harvey

Harvey is transforming legal and professional services by combining agentic AI, an enterprise-grade platform, and deep domain expertise. This role offers a unique opportunity to build a generational company at an inflection point, scaling rapidly and defining a new category. The team operates with intensity, ownership, and a commitment to the mission, valuing decisiveness, simplicity, and continuous improvement. If you are driven to do the best work of your career alongside like-minded individuals, Harvey is the place to be.

$193k - $290k

Mistral AI

Mistral AI is seeking a Research Engineer focused on Data Infrastructure to architect and build the backbone of our frontier model training and fine-tuning ecosystem. This role involves designing and scaling massive compute fleets and storage systems for high performance and scalability, with a vision towards exabyte-scale architecture. You will contribute to a strategic transition from legacy scheduling to modern orchestration, implementing sophisticated multi-cluster orchestration and cloud-bursting capabilities. The position requires full lifecycle ownership, from architecting migrations away from legacy orchestrators to implementing production-grade pipelines and participating in on-call rotations for critical training jobs.

Fal

We are seeking a Security Engineer, Infrastructure to safeguard the core systems powering fal.ai's platform, including GPU compute, multi-cloud environments, networking, and data pipelines. This role involves hands-on, systems-oriented work across the full stack, from cloud and Kubernetes to identity, networking, and secrets. You will be responsible for designing and implementing scalable security controls at the intersection of security, infrastructure, and distributed systems, ensuring the integrity and safety of our high-performance AI platform.

thinkingmachines

Thinking Machines Lab is seeking a Software Engineer focused on security to ensure their AI products are secure by default while enabling rapid product iteration. This role involves embedding with product and research teams to integrate security into the design and development process, as well as building tools and automation to maintain system safety at scale. The company is dedicated to advancing collaborative general intelligence and empowering users with AI tools tailored to their needs.

$350k - $475k

thinkingmachines

Thinking Machines Lab is seeking generalist infrastructure and systems engineers to build the core systems powering their foundation models and support internal research and product development teams. This high-impact role involves architecting and scaling critical infrastructure across the full technical stack, solving complex distributed systems problems, and building robust, scalable platforms. You will work directly with researchers to accelerate experiments, improve infrastructure efficiency, and enable key insights across models, products, and data assets.

$350k - $475k

Mistral AI

Mistral AI is a pioneering company at the forefront of AI innovation, developing cutting-edge models, products, and solutions that democratize AI. We are building products like Mistral Studio and Mistral Vibe that redefine user interaction with AI. Our mission is to integrate AI seamlessly into daily life, enhancing learning, creativity, and efficiency. We are a dynamic, collaborative, and diverse team passionate about AI's potential to transform society, with a global presence across France, the USA, the UK, Germany, and Singapore. We are seeking a Security Researcher to safeguard our innovations by anticipating, identifying, and mitigating risks, embedding an attacker's mindset into our product development.