JavaScript 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. As a Forward Deployed Engineer (FDE), you will 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 feedback that influences product and model roadmaps. You will collaborate closely with Product, Research, Partnerships, GRC, Security, and GTM teams.

Replit

Replit is seeking a Premium Support Engineer to join our team in Tokyo. In this role, you will be the primary point of contact for our most valuable customers, providing expert and timely technical support for complex product issues. You will guide customers through critical incidents, ensuring high standards of quality and speed in every interaction. This position requires a blend of deep technical troubleshooting skills and calm, confident communication to keep builders productive, whether they are enterprise teams or top-tier developers.

LangChain is seeking a Frontend Engineer to join their AI Observability & Evals Platform team. This role will focus on developing and enhancing new features for LangSmith, an enterprise platform designed for LLM application observability, testing, and debugging. You will contribute to building the foundation for agent engineering in the real world, helping developers move from prototypes to production-ready AI agents. LangChain is a fast-growing company with significant funding, offering a dynamic environment where your contributions can shape the future of AI technology.

$160k - $195k

Mercor is seeking a Full Stack Software Engineer to join their Agent Platform team. This role is central to Mercor's mission of organizing human intelligence to power the AI economy. You will own the end-to-end development of the agent platform, which serves as both an internal workbench and an external storefront for building, running, and showcasing AI agents. This platform is critical for enabling hundreds of internal users and dozens of enterprise clients, requiring a strong focus on both engineering craft and product impact, ensuring scalable, reliable systems and intuitive interfaces.

Runpod is seeking a Developer Relations Engineer to join their remote-first team. This role is crucial for building trust with developers by helping them succeed with Runpod's AI Developer Cloud. You will act as 'customer zero,' using the platform as developers do, and translating that experience into valuable content, tools, and advocacy. This position offers significant ownership, allowing you to shape developer resources, identify and build solutions for onboarding issues, and directly influence Runpod's expansion by accelerating developer adoption and reducing obstacles.

$125k - $180k

LangChain is seeking a Deployed Engineer in Chicago to join their Deployed Engineering team. This role focuses on working directly with companies to build and run AI agents in production, transforming prototypes into reliable systems. You will partner closely with customer engineers throughout the entire lifecycle, from pre-sales evaluations to post-deployment advisory. The position involves co-designing agent architectures, helping customers operate agents at scale using the LangChain suite, and contributing to the product's evolution based on real-world insights. This is a hands-on, highly technical role at the intersection of engineering, product, and go-to-market.

$200k - $250k

Cognition is seeking an Applied AI Engineer to operationalize AI modernization at the enterprise level. This role involves deploying AI solutions, specifically integrating agentic workflows into engineering processes to drive measurable productivity gains. As one of the first Applied AI Engineers, you will also play a key role in shaping the function by transforming individual customer engagements into repeatable playbooks and enablement models. The ideal candidate has strong engineering fundamentals, enjoys customer interaction, and is driven by product adoption and user success, with a systematic approach to scaling learnings.

OpenAI

We are seeking a technically proficient, business-minded Applied AI Engineer to help push the frontier of advanced AI with our strategic startup customers. You'll work with some of the most exciting AI startups in the world, guiding them through ideation, development, delivery, and scaling to accelerate and maximize the value of what they build on our platform. You will have the opportunity to work on the most novel and creative use cases being built on our API, serving as a critical partner in collecting and delivering high-fidelity product and model feedback internally. You will collaborate closely with Sales, Solutions Engineering, Applied Research, and Product teams, and you will report to the Startups Applied AI Lead.

LangChain is seeking a Deployed Engineer to join their team, focusing on making intelligent agents ubiquitous. This role involves working on challenging applied AI problems, building production systems that real teams depend on, and directly shaping the future of AI agents in the real world. You will collaborate closely with customer engineering teams, guiding them through the entire lifecycle of AI agent development and deployment, from pre-sales evaluations to post-deployment advisory work. The feedback loop is rapid, the impact is tangible, and your contributions will be instrumental in how AI agents are adopted and operated globally.

$150k - $250k

LangChain is seeking a Deployed Engineer to join their team, focusing on building and running AI agents in production. This role involves partnering closely with customer engineering teams to transform prototypes into reliable, production-ready AI systems. You will work on challenging applied AI problems, contributing to the development of systems that real teams depend on, with a fast feedback loop and visible impact. The work directly shapes how AI agents are built and adopted in the real world, bridging the gap between engineering, product, and go-to-market strategies.

$200k - $250k

LangChain is seeking a Deployed Engineer to join their team, focusing on making intelligent agents ubiquitous. This role involves working on challenging applied AI problems, building production systems that real teams depend on, and directly shaping the future of AI agents. You will collaborate closely with customer engineering teams, moving beyond prototypes to create reliable, production-ready AI agents. The feedback loop is rapid, the impact is tangible, and your contributions will significantly influence how AI agents are developed and deployed globally.

$150k - $250k

OpenAI

As an Applied AI Engineer, you will partner directly with leading organizations to design, build, and deploy AI systems that deliver measurable business outcomes. You will combine deep technical judgment, hands-on engineering, and customer leadership to take ambitious ideas from use-case selection and architecture through prototyping, evaluation, production launch, and scale. You will write and debug code, build evaluation systems, resolve complex integrations, and guide decisions involving model behavior, reliability, latency, cost, safety, security, governance, and operational readiness. Success is measured by production systems, sustained adoption, and meaningful customer impact. This is a rare opportunity to work on consequential real-world deployments at the frontier of AI while directly influencing how OpenAI’s products evolve.

Applied AI Engineers at Cognition are responsible for operationalizing AI modernization at the enterprise level, focusing on deploying AI solutions like Devin to drive measurable productivity gains. This role involves embedding with engineering teams, integrating agentic workflows, and leading customer engagements to ensure successful adoption. As one of the early members of the Applied AI team, you will also play a crucial role in shaping the function by developing repeatable playbooks, digital learning content, and enablement models to scale Cognition's impact globally. The ideal candidate possesses strong engineering fundamentals, enjoys customer interaction, and is driven by helping users unlock their potential with AI, while also thinking strategically about scaling these successes.

Runpod is seeking a Technical Support Analyst (L2) to provide advanced technical assistance and resolve complex customer issues. This role is crucial for supporting customers on the AI Developer Cloud platform, which is used by over a million developers for AI experimentation, training, fine-tuning, and deployment. The ideal candidate thrives in a dynamic, remote-first environment and is passionate about delivering exceptional customer service. This position requires weekend availability as per business needs.

$70k - $93k

Runpod is seeking a Technical Support Analyst (L2) to provide advanced technical assistance and resolve complex customer issues. This role is crucial for supporting customers on the Runpod AI Developer Cloud platform, which is used by over a million developers for AI experimentation, training, fine-tuning, and deployment. The ideal candidate thrives in a dynamic, remote-first environment and is passionate about delivering exceptional customer service. This position requires availability on weekends and the candidate must be located in Ireland, the United Kingdom, Spain, or Poland.

€70k - €83k

OpenAI

We are seeking an Early Access Deployment Engineer to lead technical engagements with customers using our frontier capabilities. You will operate at the early stages of development, where capabilities, tooling, and processes are evolving. In this hands-on role, you will act as a technical partner to customers and our research/product teams, identifying high-value use cases, prototyping solutions, designing evaluations, and troubleshooting issues. You will manage multiple customer engagements, helping them navigate ambiguity and translating their experiences into actionable feedback for Research and Product. This role also involves owning the end-to-end execution of early access programs, from onboarding and live experimentation to synthesizing findings and informing launch decisions. Success means translating frontier capabilities into real-world customer value and high-quality research signals, developing reusable technical approaches, and improving how OpenAI learns from customers.

Cartesia is seeking a Product Support Engineer to ensure customer success on their AI platform. This role involves resolving complex technical issues, providing world-class support, and collaborating closely with engineering and product teams. You will be a key point of contact for customers, influencing the product roadmap and improving reliability through hands-on feedback and issue reproduction. This is a critical position for shaping the customer experience and setting support standards at a cutting-edge AI company.

OpenAI

As an Enterprise Applied AI Engineer at OpenAI, you will partner directly with leading organizations to design, build, and deploy AI systems that deliver measurable business outcomes. You will combine deep technical judgment, hands-on engineering, and customer leadership to take ambitious ideas from use-case selection and architecture through prototyping, evaluation, production launch, and scale. This role involves writing and debugging code, building evaluation systems, resolving complex integrations, and guiding decisions across model behavior, reliability, latency, cost, safety, security, governance, and operational readiness. Success is measured by production systems, sustained adoption, and meaningful customer impact. This is a rare opportunity to work on consequential real-world deployments at the frontier of AI while directly influencing how OpenAI’s products evolve.

Replit

Replit is seeking a Senior AI Builder to design, architect, and ship AI-powered internal platforms that run the company's operations across multiple departments. This role requires a builder with substantial autonomy who can tackle ambiguous business problems, understand them deeply, and deliver software solutions. The ideal candidate will possess a strong understanding of business mechanics, revenue generation, and operational challenges across various functions like People Operations, Customer Support, Sales, Marketing, Finance, and Recruiting. Experience running a business or working in a fast-scaling startup is highly valued, emphasizing ownership, shipping with incomplete information, and driving outcomes.

LangChain is seeking an IT Systems Engineer to join our growing team in San Francisco. This role is critical to maturing and scaling our IT foundation as the company expands. You will bring deep technical expertise to our fleet management and SaaS administration, with the opportunity to shape how we manage our fleet, identity, SaaS stack, and business automation. The ideal candidate has startup experience, thrives in ambiguity, enjoys problem-solving, and is excited to build scalable systems to support our global team.

$150k - $170k