Python Jobs

OpenAI

We are seeking a software engineer to help build the platform that qualifies and optimizes inference workloads across heterogeneous compute environments. You will develop both OpenAI-hosted services and secure partner-side software for running long-lived optimization workflows. These workflows generate candidate kernels, runtime configurations, and serving-stack changes; compile and execute them on target hardware; verify their correctness; measure their performance; and use the results to guide further optimization. You will work across model architecture, distributed execution, compilers, runtimes, networking, and accelerator systems. A central part of the role is turning research prototypes and one-off hardware bring-up efforts into reliable, reusable infrastructure with clear contracts, reproducible results, strong observability, and well-defined security boundaries.

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.

Baseten is seeking a highly impactful individual to lead the Voice AI product area, owning the end-to-end development and implementation of their in-house inference stack for Voice AI models. This role involves partnering closely with various engineering teams to push the boundaries of Voice AI, making a significant impact on industries like productivity, customer service, and education. You will be responsible for bringing state-of-the-art open-source models into production, focusing on optimizing model serving for latency, throughput, and GPU efficiency, and building large-scale, real-time infrastructure for multi-model voice agents.

Perplexity is seeking a Member of Technical Staff (Software Engineer, Monetization) to own the critical billing platform and monetization systems that power their agentic AI products, including Computer. This role is foundational to Perplexity's revenue streams, responsible for metering agent actions, enforcing credit budgets, and settling costs. You will design and build abstractions that enable product teams to easily introduce new SKUs, run pricing experiments, and convert users to paying customers, ensuring all revenue paths are reliable, observable, and extensible across subscriptions, usage-based billing, and enterprise contracts.

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.

Perplexity is seeking builders to join its highly leveraged engineering team to create innovative products that accelerate human productivity. As an engineer, you will build products and systems that define how AI empowers humans to think, decide, and act. You will ship fast and work across product, infrastructure, and frontier-level advancements in technology, focusing on craftsmanship, ownership, entrepreneurship, scholarship, and partnership. This role is for individuals who identify problems, design solutions, and ship them, acting with urgency and a founder's mindset to deliver for users.

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.

OpenAI

OpenAI's Forward Deployed Engineering team partners with customers to turn research breakthroughs into production systems, operating at the intersection of customer delivery and core platform development. Forward Deployed Engineers (FDEs) lead complex end-to-end deployments of frontier models in production alongside our most strategic customers. You will own discovery, technical scoping, system design, build, and production rollout, partnering directly with customer engineering and domain teams. Success will be measured through production adoption, measurable workflow impact, and eval-driven feedback that influences product and model roadmaps. You'll collaborate closely with Product, Research, Partnerships, GRC, Security, and GTM teams.

Poolside is building a company to create Artificial General Intelligence, aiming to accelerate software development through agentic systems, coding assistants, and frontier models. This role is part of the Applied Research team, focused on transforming pre-trained Large Language Models (LLMs) into well-aligned and highly capable AI systems specifically for coding and software development. You will be involved in building data pipelines and environments for agentic use cases, researching and implementing post-training algorithms, and designing experiments to test hypotheses, with access to significant GPU resources.

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.

As a Software Engineer on Applied AI, you will build, deploy, and operate systems that bridge frontier AI research and data delivery. This is a high-ownership, deeply technical role where you will tackle ill-defined problems, prototype rapidly with researchers and customers, and transition systems from early experiments to reliable, scalable production. You will manage projects end-to-end, including requirements gathering, creating data pipelines, and enhancing model-adjacent infrastructure, while collaborating with frontier AI labs and internal teams to deliver impactful applied AI solutions.

OpenAI

OpenAI is building the infrastructure foundation for the next generation of AI. The Data Center Engineering team defines the strategy, reference architectures, technical requirements, and delivery standards for the large-scale data centers that support OpenAI research, products, and infrastructure partners. As a Data Center Controls Network Engineer, you will design, validate, and scale the controls and OT network architectures that support high-density AI data centers. You will work across controls systems, OT infrastructure, telemetry, commissioning, deployment, and operations, partnering with mechanical, electrical, IT/networking, security, and external delivery teams. We are seeking a mid to senior OT Network Engineer with a strong controls systems background to lead the design and operation of resilient, secure, and scalable OT network architectures for high-density AI data centers. This role translates compute, power, cooling, and operational requirements into practical OT network designs, evaluates vendor solutions, and drives technical decisions across controls infrastructure, telemetry, commissioning, and operations. The ideal candidate has strong hands-on experience in mission-critical OT environments, including industrial networking, virtualized infrastructure, and OT network operations, with expertise in routing, switching, segmentation, firewall policy, time synchronization, monitoring, and network lifecycle support.

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.

We are seeking a Member of Technical Staff focused on pretraining to join our research team. This role is central to developing the next generation of multimodal foundation models for image, video, and audio. You will have a significant impact on shaping training objectives, architectures, data strategies, and systems, with your research directly influencing products used by millions. This is a Staff/Senior individual contributor position for someone with proven experience leading frontier pretraining efforts.

€130k - €340k

Mercor is seeking its first Agentic Finance Engineer to join their team. This foundational role sits at the intersection of finance, data engineering, and applied AI, responsible for building and deploying the modern data and automation stack from the ground up. You will architect scalable financial data models, integrate AI agents into real workflows, and transform manual, spreadsheet-driven processes into reliable, production-grade systems. The ideal candidate possesses deep finance domain knowledge, understanding core financial operations, and has the technical fluency to translate this into automated systems. You should be comfortable with both SQL and communicating with executive leadership, thriving in a zero-to-one building environment.

$175k - $250k

Sarvam is building India's full-stack sovereign AI platform, focusing on research, models, infrastructure, and applications to make AI work for India. The MLOps Engineer will own the model lifecycle across all deployments, ensuring systems are always operational, accurate, and auditable. This role involves supporting field engineers and managing deployment infrastructure for new products, with an uncompromising standard for reliability, as model failures are considered operational risks.

Sarvam is building India's full-stack sovereign AI platform, focusing on research, models, infrastructure, and applications to make AI work for India. As a Strategic Deployment Engineer, you will be embedded with clients, owning the entire lifecycle of AI system deployments in complex and often constrained environments like air-gapped or on-premise settings. You will act as the primary technical point of contact for your assigned accounts, with success measured by system functionality, client trust, and durable capability creation, rather than just ticket closure. This role offers significant autonomy and accountability for the system, client relationship, and overall outcomes.