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Sierra is building a platform to enable companies worldwide to create better, more human customer experiences with AI. We partner with industry leaders and are primarily an in-person company based in San Francisco, with growing international offices. Our co-founders have extensive experience from leading tech companies like Salesforce, Facebook, and Google, with one co-founder currently serving as Board Chair of OpenAI. We are guided by core values of Trust, Customer Obsession, Craftsmanship, Intensity, and Family, which shape our culture and actions.

OpenAI

As an AI Architect, you will be the senior technical owner for a named portfolio of customers, acting as the primary technical counterpart to their leadership teams. You will shape each customer's AI strategy, guiding their journey from pre-sales discovery and solution evaluation through deployment, adoption, and measurable business impact. You will own the technical account plan across various OpenAI solutions, translating business priorities into a focused use-case portfolio and an actionable adoption roadmap. You will remain accountable for the technical outcome, coordinating specialists for deeper expertise and execution where needed, requiring strong industry fluency, sound architectural judgment, and the ability to navigate executive strategy and hands-on technical conversations.

LangChain is seeking a Fullstack Engineer to join the LangSmith team, focusing on our commercial AI observability and evaluation platform. In this role, you will build new features and functionality, collaborating closely with enterprise customers, developer end-users, and internal stakeholders. You will have the opportunity to shape the product and contribute to making intelligent agents ubiquitous.

$145k - $180k

OpenAI

The Codex Research team at OpenAI is responsible for developing frontier AI agents, including the models behind Codex, ChatGPT, and other advanced products. This role focuses on improving the capabilities, reliability, and product fit of these agentic models. You will have the opportunity to own research directions, build critical training infrastructure, create evaluation methods, or drive capabilities from initial concept through experimentation and launch. This is a broad, high-agency role for individuals who can tackle ambiguous problems across research, engineering, data, evals, and product, and who are excited about building AI that can act in the world, write code, use tools, and collaborate with users and other agents.

We are seeking engineers to develop open-source libraries that enable customers to observe, understand, and optimize AI within their production applications. These SDKs are a crucial component of our platform, powering evaluation and observability pipelines across diverse environments, frameworks, and AI providers. This role is perfect for engineers who are passionate about developer experience, API design, and building high-performance, reliable, and idiomatic libraries. You will manage the entire SDK lifecycle, from design and implementation to release, documentation, and community support. Your contributions will be integrated into thousands of applications, shaping the adoption and operationalization of AI across industries.

OpenAI

As a Security Engineer on the Agent Security Team, you will be at the forefront of securing OpenAI’s cutting-edge agentic AI systems. Your role will involve designing and implementing robust security frameworks, policies, and controls to safeguard OpenAI’s critical assets and ensure the safe deployment of agentic systems. You will develop comprehensive threat models, partner tightly with our Agent Infrastructure group to fortify the platforms that power OpenAI’s most advanced agentic systems, and lead efforts to enhance safety monitoring pipelines at scale. We are looking for a versatile engineer who thrives in ambiguity and can make meaningful contributions from day one, prepared to ship solutions quickly while maintaining a high standard of quality and security. You will need to bring expertise in securing complex systems and designing robust isolation strategies for emerging AI technologies, all while being mindful of usability, and communicate effectively across various teams and functions.

Hebbia is seeking a Backend Engineer to join the Agent Collaboration Platform team. This team builds interactive tools for AI agents, including a generative spreadsheet that coordinates complex agentic workflows. The role involves blending expertise in systems, application layer software, and data modeling to create highly efficient software solutions. You will integrate product experience with powerful distributed systems and contribute to Hebbia's technical edge through elegant software design and sophisticated integrations. We value engineers who are fast-moving, accountable for quality, and detail-oriented.

$160k - $350k

Hebbia is building the AI platform for investors and bankers that generates alpha and drives upside. Our flagship product, Matrix, delivers industry-leading accuracy, speed, and transparency in AI-driven analysis, trusted to help manage over $30 trillion in assets globally. The Agents team builds everything from core document understanding capabilities to co-piloting experiences for Matrix and deep, multi-source research, utilizing custom agentic frameworks powered by distributed systems built for scale. We aim to build steerable, reliable, and explainable agentic systems for the scale of data our customers bring to the table, creating a product that becomes indispensable and delightful. A backend engineer at Hebbia blends expertise in systems, application layer software, and data modeling to build highly efficient software solutions. You will be responsible for leveraging the latest software and agentic solutions and integrating product experience with powerful distributed systems. You’ll help protect Hebbia’s technical edge via elegant software design, efficient data communication, and sophisticated integrations. We value engineers who move fast, hold themselves accountable to quality, and are detail-oriented.

$160k - $350k

Hebbia is seeking a Backend Software Engineer to join the Growth and Data team. This role is crucial for building and maintaining the backend systems that power user engagement and the expansion of Hebbia's AI platform for investors and bankers. You will be responsible for architecting and implementing robust APIs, services, and infrastructure to deliver tailored, high-value customer experiences, including personalized data views and powerful integrations. Collaborating with product, design, and frontend teams, you will own core backend features from conception to deployment, ensuring scalability, reliability, and performance. Your contributions will directly impact customer success and drive the adoption and growth of the Hebbia platform.

$160k - $350k

Hebbia is building an AI platform for investors and bankers to generate alpha and drive upside. Our flagship product, Matrix, delivers industry-leading accuracy, speed, and transparency in AI-driven analysis, trusted to help manage over $30 trillion in assets globally. The Document Intelligence team focuses on developing cutting-edge AI solutions for discovering and interacting with billions of documents, enabling intelligent exploration, powerful search, and deep insights extraction. We aim to empower users by transforming vast document repositories into actionable intelligence.

$160k - $350k

Clay is seeking an Engineering Manager to lead and grow a high-performing engineering team as the company scales through rapid growth. This role involves taking ownership of the team's mission and objectives, ensuring the delivery of high-quality solutions to critical challenges. The manager will foster an engaged, motivated, and collaborative team culture, supporting the professional development of each team member. Collaboration with product, design, support, and other engineering teams will be key to scaling and improving the product, with ample opportunities to tackle interesting problems and technical challenges.

We are seeking an early engineer to join our Physical AI security platform team. This platform is powered by AI agents and supports the development of secure Physical AI and Vehicle Intelligence platforms, spanning the full product lifecycle. You will have significant influence over the direction and implementation of the system. The role involves building agentic security workflows for threat modeling, cyber risk analysis, threat detection, and investigation, as well as developing AI risk engines, intelligent intrusion detection, and security testing simulation engines.

$60k - $300k

Sierra is a leading platform for customer-facing AI agents, partnering with major global brands to transform customer service and business growth. We are primarily an in-person company based in San Francisco, with growing international offices. Our culture is built on values of Trust, Customer Obsession, Craftsmanship, Intensity, and a commitment to balancing family life. Our co-founders, Bret Taylor and Clay Bavor, bring extensive experience from leading tech companies like OpenAI, Salesforce, Facebook, and Google.

Crusoe is seeking a Staff Product Security Engineer with deep AI/ML security expertise to enhance the company's security posture across applications, infrastructure, and distributed AI systems. This is a highly technical role focused on advanced penetration testing, AI/ML attack surface research, and developing secure-by-design guardrails for engineering teams. The role operates at the intersection of offensive security, AI systems, and production engineering, with end-to-end ownership of security outcomes and influence over system design across the organization.

$250k - $285k

Sierra is building a platform to enable companies to create better, more human customer experiences with AI. We are seeking a Developer Relations Engineer to help onboard and educate customers on our Agent SDK and Agent Studio platform. This role involves leading the creation and execution of developer training programs, building scalable content like documentation and videos, and developing AI Agents as an Agent Software Engineer. You will also collaborate with marketing to publish developer success stories and inspire our technical community. This is an opportunity to become a world-leading expert in agent development and contribute to a growing AI company.

Sierra is building a platform to enable companies to create better, more human customer experiences with AI. As a Security Engineer, you will build the foundational systems and controls that ensure Sierra's AI agents are secure, protecting customer data and trust. You will partner across product and platform teams to integrate security, privacy, and safety as core product capabilities and secure defaults. This role involves designing and implementing systems across various security domains, including product security, infrastructure security, enterprise security, identity, and detection and response. You will identify risks, strengthen architectures, and build durable defenses, while also owning cross-cutting systems, threat modeling, code reviews, and evolving security primitives. The position requires a strong software engineering background, systems thinking, and the ability to automate and scale security workflows.

Inworld is seeking an ambitious and capable Staff/Principal Backend Engineer to join their team and contribute to the advancement of the Inworld AI platform. This role will involve working on exciting new products, including the Inworld Router, an intelligent routing layer for LLMs, and API-based model services for TTS/STT. You will tackle complex infrastructural projects, focusing on platformization, development tools, and system-wide billing. The position emphasizes rapid iteration, building novel platform capabilities, and optimizing for real-time performance in consumer AI applications. Collaboration with ML teams is integral to the role, as AI and ML are critical to the platform's vision.

Inworld is seeking an ambitious and capable Staff/Principal Backend Engineer to join their research lab and contribute to the advancement of their AI platform. This role will focus on developing and scaling core systems for exciting new products, including an intelligent routing layer (Inworld Router) that supports over 200 LLMs, real-time API services, and API-based model services like TTS/STT with voice cloning. The position involves tackling complex infrastructural projects, platformization, and system-wide billing, with a strong emphasis on collaboration with ML teams to drive learning and adaptability. This is an individual contributor role focused on direct technical contribution.

$280k - $350k

Sierra is building a platform to enable companies worldwide to create better, more human customer experiences using AI. We partner with industry leaders and are primarily an in-person company based in San Francisco, with growing international offices. Our co-founders have extensive experience from leading tech companies like Salesforce, Facebook, and Google, with one co-founder currently serving as Board Chair of OpenAI. We are guided by core values of Trust, Customer Obsession, Craftsmanship, Intensity, and Family.

OpenAI

OpenAI is seeking a Research Engineer for Frontier Evals & Environments to help build north star model environments that drive progress towards safe AGI/ASI. This role will directly guide the research programs of ambitious training runs, with past open-sourced evaluations including GDPval, SWE-bench Verified, MLE-bench, PaperBench, and SWE-Lancer. You will work with researchers, engineers, product teams, infrastructure teams, and safety/alignment partners to define model run objectives, measure outcomes, and ship improvements into widely used products. This is a high-agency role for individuals passionate about seeing their work directly impact frontier models and steering them towards beneficial outcomes.