Python Jobs

As a Machine Learning Engineer on the Marketplace team, you will build the models and decision systems that power Mercor's hiring engine. This includes search and ranking, candidate-job matching, marketplace recommendations, personalization, and allocation decisions across a rapidly growing talent network. This is an applied ML role with direct product and revenue impact, working on problems shaped by real marketplace constraints such as sparse and delayed labels, cold start, noisy feedback, heterogeneous supply and demand, and the need to optimize across speed, quality, and conversion simultaneously.

Skild AI is seeking a Computer Vision AI & ML Engineer to design, build, and deploy advanced perception systems for real-world robotics and automation. You will work across the full machine learning lifecycle—model development, data strategy, evaluation, and production integration—to deliver robust, high-performance vision capabilities. This role combines applied research with hands-on engineering and offers the opportunity to influence both architecture and roadmap decisions.

As a Security Engineer at HeyGen, you will own the security posture of one of the fastest-growing AI companies in the world. You will partner directly with engineering teams to ship secure features, harden our cloud infrastructure, and build the compliance and trust programs that unlock enterprise deals. This is a high-impact, high-autonomy role for an engineer who thinks in threat models and ships code.

Perplexity is seeking a Member of Technical Staff (Data Scientist, Evals) to join their team. In this role, you will build specialized evaluations to improve answer quality across Perplexity's LLM-first search engine and other user-facing scenarios. You will architect and maintain automated evaluation pipelines, design evaluation sets to measure the impact of tool calls on answer quality, and develop VLM-based solutions for visual rendering evaluation. You will also adapt and incorporate public benchmarks and academic evaluations into regular performance measurements, working closely with technical leadership to shape product changes.

Sarvam is building the bedrock of Sovereign AI for India, developing a full-stack AI platform across research, models, infrastructure, and applications. This role focuses on building the platform that sits on top of a large, multi-vendor GPU fleet, serving demanding training and inference workloads. You will design and ship control-plane services, scheduler integrations, autoscaling controllers, inference-serving platforms, RBAC and quota systems, observability and cost tooling, and the CLI and APIs that ML engineers use daily. The work is heavy software engineering, treating the platform as a product with internal users as customers.

Harvey

Harvey is transforming legal and professional services by combining agentic AI, an enterprise-grade platform, and deep domain expertise. We are seeking a Research Engineer focused on post-training to scale the process of turning expert feedback and agent traces into significantly improved models. This role involves defining and running model training experiments, interpreting results, and collaborating with internal and external partners to enhance data, environments, graders, and training methodologies. The ideal candidate is a self-manager with extensive hands-on experience training open-weight models and the engineering depth to execute and debug experiments efficiently.

$231k - $340k

Mistral AI

Mistral AI is seeking Applied Scientists and Research Engineers to drive innovative research and collaborate with clients on complex research projects. You will develop state-of-the-art models across different modalities such as text, image, and speech. By developing novel methods and research ideas, you will apply these models across a diverse set of use cases and domains. Working cross-functionally with both external and internal science, engineering, and product teams, you will deliver high-impact AI solutions that turn the needle.

Mistral AI

Mistral AI is seeking Applied Scientists and Research Engineers to drive innovative research and collaborate with clients on complex research projects. You will develop state-of-the-art models across different modalities such as text, image, and speech, applying novel methods and research ideas to diverse use cases and domains. Working cross-functionally with science, engineering, and product teams, you will deliver high-impact AI solutions. We are a dynamic, collaborative team passionate about AI and its potential to transform society, with teams distributed across France, USA, UK, Germany, and Singapore.

Mistral AI

Mistral AI is seeking an Applied AI Engineer to join their team and facilitate the adoption of their AI products among customers. This role involves collaborating with clients to address complex technical challenges, from pre-sale to post-implementation, ensuring Mistral's solutions meet and exceed expectations. The engineer will manage daily customer relations, act as a key resource in externalizing research into production settings, and work on state-of-the-art Generative AI applications across various industries. This position offers the opportunity to contribute to a pioneering company shaping the future of AI and make a meaningful impact.

Mistral AI

Mistral AI is seeking an Applied AI Engineer to facilitate the adoption of its products among customers and collaborate with them to address complex technical challenges. This role is an integral part of the Applied AI Engineering team, dedicated to driving the successful deployment of Mistral AI products. You will work hand-in-hand with customers from the pre-sale stage to post-implementation, ensuring our solutions meet and exceed client expectations.

Mistral AI

Mistral AI is seeking an Applied AI Engineer to facilitate the adoption of its products among customers and collaborate with them to address complex technical challenges. This role is an integral part of the Applied AI Engineering team, dedicated to driving the successful deployment of Mistral AI products. You will work hand-in-hand with customers from the pre-sale stage to post-implementation, ensuring our solutions meet and exceed client expectations.

Mistral AI

Mistral AI is seeking an Applied AI Engineer to join our Applied AI Engineering team. This role is integral to driving the successful deployment of Mistral AI products and building complex enterprise use cases. You will work hand-in-hand with customers from pre-sale to post-implementation, ensuring our solutions meet and exceed client expectations. You will manage customer relations involving multiple stakeholders and function as a key resource in externalizing our research in production settings, facilitating the adoption of our products and collaborating to address complex technical challenges.

Rogo is transforming global finance with AI, empowering professionals at top investment firms with unparalleled speed, accuracy, and insight. We are redefining financial workflows and are seeking a Data Engineer to own and scale our Analytics infrastructure. This is a hands-on, high-leverage role where you will build and maintain critical data pipelines, orchestration, and ensure reliability. As an AI-native organization, this role also has a product dimension, as the systems you build will measure and support the development of our AI-powered product. You will be expected to develop a deep understanding of the product and contribute to its improvement.

OpenAI

OpenAI's API Platform organization is seeking full stack and frontend engineers to help define and build the next generation of OpenAI's developer experience. This role involves working across frontend product surfaces, backend systems, SDK and documentation pipelines, and API workflows that serve millions of developers and companies. You will partner closely with product, design, research, API engineering, and developer-facing teams to make complex AI capabilities simple to understand, easy to test, and safe to launch in real-world applications. This is a highly cross-functional role for someone who cares deeply about craft, developer empathy, reliability, and product velocity.

Cognition is seeking an AI Support Engineer to resolve complex technical issues for customers using their AI software engineer products, Devin and Windsurf. This role involves investigating ambiguous, environment-specific problems across codebases, infrastructure, developer tooling, CI/CD systems, APIs, containers, and cloud platforms. You will be responsible for reproducing bugs, analyzing logs, tracing failures, forming root-cause hypotheses, and driving issues to resolution. The ideal candidate has strong debugging instincts, broad systems knowledge, and the ability to operate with urgency in a high-volume environment, comfortable context-switching and communicating clearly with customers and engineering teams.

Cognition is seeking an AI Support Engineer to resolve complex technical issues for customers using their AI software engineer products, Devin and Windsurf. This role involves investigating ambiguous, environment-specific problems across codebases, infrastructure, developer tooling, CI/CD systems, APIs, containers, and cloud platforms. You will be responsible for reproducing bugs, analyzing logs, tracing failures, forming root-cause hypotheses, and driving issues to resolution. The ideal candidate has strong debugging instincts, broad systems knowledge, and the ability to operate with urgency in a high-volume environment, comfortable context-switching and communicating clearly with customers and engineering teams.

Fal

fal is building the generative media ecosystem for the next generation of AI products, providing the infrastructure, tools, and model access needed to scale from idea to production. As generative media reshapes industries, fal is becoming the foundation for ambitious teams. This hybrid ML Engineering / Site Reliability Engineering role will own the reliability, security, and safety of fal's generative media model APIs, ensuring they remain available, performant, secure, and safe for thousands of developers and enterprises. You will address model-specific failure modes, such as degraded output quality, drift, unsafe generations, and abuse patterns, as critical reliability concerns alongside uptime and latency.

Harvey

Harvey is transforming legal and professional services by combining agentic AI, an enterprise-grade platform, and deep domain expertise. We are building a generational company at an inflection point, with strong product-market fit and investor support, scaling fast and defining a new category. The work is ambitious, the bar is high, and the opportunity for growth is unmatched. Our team moves fast, takes ownership, and is deeply committed to our mission, operating with intensity and pushing for excellence. We value decisiveness, simplicity, and a "Job's Not Finished" mentality. As a Software Engineer on the Product Engineering team, you will own and lead engineering projects across our product lines, working closely with AI, Legal, and GTM teams to build secure systems that deliver value to our customers. We seek individuals experienced across the stack on incredible products, excited about building the future of application layer and genAI products.

$231k - $340k

Harvey

Harvey is transforming how legal and professional services operate by combining frontier agentic AI, an enterprise-grade platform, and deep domain expertise. This is a rare chance to help build a generational company at a true inflection point, scaling fast and defining a new category. The work is ambitious, the bar is high, and the opportunity for growth is unmatched. The team moves fast, takes ownership, and is deeply committed to the mission, operating with intensity and pushing for excellence. As a Software Engineer on the Product Engineering team, you will own and lead engineering projects across various product lines, working closely with AI, Legal, and GTM teams to build secure systems that deliver value to customers. We are looking for individuals excited about building the future of application layer and genAI products.

$193k - $290k

Scale AI

Scale AI is seeking a Senior Software Engineer to design, build, and operate secure, scalable infrastructure that empowers employees. You will join a team focused on automating identity and access management, endpoint management, and the broader SaaS stack. The role involves leveraging internal and external models to create applications, slackbots, and dashboards for internal users, streamlining complex workflows through automation, and significantly enhancing the velocity of G&A teams. As a full-stack engineer, you will contribute to building internal and external tools, developing cloud-native distributed systems, integrating with SaaS platforms, and ensuring product quality through testing and debugging.

$216k - $270k