AI Agent Engineer Jobs at Startups

Sierra

Sierra is a leading platform for customer-facing AI agents, transforming how businesses serve customers and grow. We are seeking a Software Engineer to join our Horizon team, focusing on building advanced AI agents capable of complex, long-horizon tasks across multiple communication channels. This role involves developing core agent capabilities, creating reusable systems and abstractions, and shaping the future of our AI product. You will tackle technically challenging problems in orchestration, integrations, data, memory, and observability, translating validated solutions into durable product features.

$230k - $390k

Sierra

Sierra is a leading platform for customer-facing AI agents, transforming how businesses serve customers and grow. This role focuses on the core systems that power these AI agents across various communication channels, including phone calls, SMS, WhatsApp, email, and in-app chat. You will be instrumental in building the future of how entire industries operate with AI agents, tackling complex challenges in real-time, multi-modal conversations and ensuring seamless integration with global communication networks. The team is responsible for making AI voice feel like a real conversation, developing safe integration methods for personal AI assistants, and building the agent experience within customer applications.

$230k - $390k

Sierra

Sierra is a leading platform for customer-facing AI agents, partnering with major brands to revolutionize customer service and business growth. We are primarily an in-person company based in San Francisco, with a culture guided by values of Trust, Customer Obsession, Craftsmanship, Intensity, and a commitment to balancing Family. Our co-founders, Bret Taylor and Clay Bavor, bring extensive experience from leading technology companies like Salesforce, Facebook, and Google, with Bret currently serving as Board Chair of OpenAI.

$230k - $390k

Sierra

Sierra is a leading platform for customer-facing AI agents, partnering with major brands to revolutionize customer service and business growth. We are primarily an in-person company based in San Francisco, with a culture guided by values of Trust, Customer Obsession, Craftsmanship, Intensity, and a commitment to balancing Family. Our co-founders bring extensive experience from leading tech companies like Salesforce, Facebook, and Google, with one co-founder currently serving as Board Chair of OpenAI.

$230k - $390k

Indicium AI is seeking an experienced Principal Forward Deployed AI Engineer to scale their impact and provide technical authority across multiple areas. This is a hands-on engineering role with broader technical, people, and commercial responsibilities. You will be deeply involved in the codebase, tackling complex challenges and acting as the primary technical voice. Your role will involve guiding delivery squads, managing commercial aspects of projects, and evolving into a trusted partner who shapes client roadmaps. You will also contribute to growing Indicium AI by developing reference architectures, agent patterns, and accelerators, assisting with hiring and talent development, and supporting pre-sales and client acquisition efforts.

Salary not listed

Indicium AI is seeking Senior Forward Deployed AI Engineers to build and deploy production agentic AI systems for enterprise clients. You will be embedded in client teams, tackling complex technical challenges and delivering high-quality AI solutions. This role involves working with multi-agent orchestration, RAG pipelines, and ensuring the reliability and observability of non-deterministic systems in regulated environments. You will also communicate technical concepts to both engineers and non-technical stakeholders, building credibility and trust.

Salary not listed

Indicium AI is a trusted partner for deploying AI solutions at enterprise scale, working with leading organizations and AI models. We focus on making AI a genuine competitive advantage for our clients through production deployments. We invest in our people, providing access to the latest AI tools, training, and flexible learning budgets. This role is for an engineer who wants to lead AI engagements end-to-end, from solution design to production deployment, and be accountable for their team's success. You will be the go-to person for complex technical challenges, making key architecture decisions, and setting high delivery standards. The role involves managing teams, dependencies, and risks, while understanding enterprise environments and navigating internal review and security processes. You will also own the client relationship, providing advice and managing expectations effectively. This is a hands-on engineering role where you will be actively involved in the codebase weekly, making and owning architecture decisions, and solving difficult technical problems.

Salary not listed

NODA AI is seeking an AI/ML Engineer to design and implement intelligent agents for adaptive mission planning and orchestration across multi-domain unmanned systems. This role involves working with LLM orchestration frameworks, agent reasoning systems, and deploying AI models to edge computing environments on autonomous vehicles. You will build systems that translate high-level mission intent into actionable autonomous behaviors, dynamically adapt plans to changing environments, and provide explainable reasoning to human operators. The work integrates directly with a ROS autonomy stack and ensures reliable AI performance on resource-constrained edge hardware.

Salary not listed

Sierra

Sierra is seeking a Software Engineer Intern to join their team in London, focusing on customer-facing AI agents. This internship offers hands-on experience in designing, developing, and shipping features for AI agents used by major brands. Interns will learn from real-world applications at scale and contribute to shaping the future of AI technology. The role is ideal for students eager to gain practical experience in a fast-paced, innovative environment.

Salary not listed

Steel is building open-source browser infrastructure for AI agents and apps, enabling developers to ship AI products that interact with the web via their Sessions API. With significant growth and backing from world-class investors, Steel is assembling a talented team to shape the future of human-internet interaction. This internship offers the chance to work on real technical challenges, from scaling browser infrastructure to developing tools and experimenting with AI agents, with opportunities for ownership and shipping production code.

Salary not listed

Browserbase

Browserbase is seeking a Software Engineer to join the Agent Platform team. This team operates at the intersection of AI and open source, building developer tools that make browser automation smarter, simpler, and more powerful. You will be responsible for building, operating, and growing the Agent Platform framework, which includes developer-first APIs with significant monthly downloads and stars. The role involves designing and implementing tools for web automation, collaborating with leading AI labs to improve models and make them accessible, and deploying production-ready AI solutions that impact millions of users. You will also help define and prioritize projects that shape the future of developer tooling and contribute to documentation and knowledge sharing.

$180k - $300k

Perplexity AI

The Enterprise Agent Evals & Efficiency team at Perplexity focuses on enhancing the capabilities of AI agents to perform real-world tasks across various enterprise connectors, tools, and data sources. The primary objective is to enable agents to select the appropriate tools, utilize relevant context, and execute complex workflows reliably, while minimizing time and computational resources. This role involves end-to-end ownership, from developing realistic enterprise evaluation environments to implementing improvements in the agent harness, tools, and skills. You will create intricate scenarios involving connected systems, data, and permissions to pinpoint agent weaknesses and refine the tools, skills, context, and models they employ. Collaborating with AI Research, Connectors, and Platform teams, you will translate experimental findings into tangible improvements in task success rates, latency, and cost efficiency.

$220k - $405k

Pallet is building AI Agents to transform the physical economy, a $12 trillion global industry. We are seeking a Software Engineer, Agent Delivery to deploy production AI agents within large supply chain companies. This role involves working directly with customer teams to understand critical workflows, design integrations, debug production systems, and implement AI-powered solutions in complex environments. You will own deployments from discovery to launch, acting at the intersection of engineering, product, and customer operations, and will spend time with customers both remotely and onsite.

$135k - $180k

Our Internal Acceleration team is seeking a Research Engineer to build agents that accelerate the production of frontier tokens. You will collaborate directly with founders and embed with the production team to develop new agentic harnesses and operating systems, transforming hardware development in an AI-native world. This role involves working on harnesses, tool use, context, memory, execution environments, and evaluation frameworks to enable agents to perform long-running, useful engineering tasks. We are looking for individuals who thrive in ambiguous environments, possess strong product sense, and are eager to own problems end-to-end, viewing this as an opportunity to shape future ventures. The work is time-sensitive and business-critical, demanding dedication beyond a standard 9-5 schedule.

$150k - $400k

Blee

Blee is seeking an Applied Scientist to specialize in agent system design, focusing on architecting and implementing the next generation of intelligent compliance systems. This role involves designing frameworks where multiple agents, powered by custom and foundational models, collaborate to identify, track, and explain compliance flags. You will also be responsible for building and optimizing applied AI/ML pipelines, including model fine-tuning, prompt engineering, evaluation frameworks, and customer-specific AI configurations, and training models based on user feedback to deliver more targeted compliance recommendations.

$150k - $275k

Temporal

Temporal is seeking a Staff Software Engineer to lead AI agent optimization efforts. This role involves designing and building tools and mechanisms to help users optimize AI agents for token spend, response time, and result quality. You will focus on techniques like model routing, multi-agent architecture, cache policy, and context management, requiring direct experience in this problem domain. You will collaborate with other AI Foundations team members on agentic development, ecosystem integrations, and policy/security systems, blending theory and practice to solve customer problems and ship fast.

$170k - $278k

Our Internal Acceleration team is building agents to speed up the production of frontier tokens. You will collaborate directly with founders and embed with our special projects team to develop new agentic harnesses and operating systems, fundamentally changing how hardware is built in an AI-native world. Your success will be measured by the acceleration of Etched's progress, not just lines of code. This role is ideal for engineers who excel in ambiguous environments, possess strong product intuition, and are eager to own problems from inception to completion. It's a dynamic, time-sensitive, and business-critical position that requires dedication beyond a standard 9-5.

$150k - $400k

Our Internal Acceleration team is building agents to accelerate the production of frontier tokens. You will work directly with founders and embed with our production team to create new agentic harnesses and operating systems, transforming hardware development in an AI-native world. Success is measured by how much faster the company moves, not just lines of code. This role is for engineers who thrive on ambiguity, possess strong product sense, and want to own problems end-to-end, acting as a launchpad for future founders. The problems are time-sensitive and business-critical, and the role demands dedication beyond a typical 9-5.

$150k - $400k

Cohere Health

We are seeking a Senior Software Engineer - AI to join our Engineering team. In this role, you will build intelligent agents and applications serving health insurance plans covering over 15 million people. You'll partner closely with product, data science, and clinical teams to build the foundation that transforms how clinical intelligence is delivered at scale. This is an opportunity to make a direct impact on healthcare outcomes while working with modern technologies in a fast-paced, collaborative environment.

Salary not listed

TRM Labs

TRM Labs is seeking a Software Engineer, API Integrations to join their AI Engineering team. This role focuses on building third-party integrations and a scalable integration platform for AI-native products. You will design and implement reliable connectors, APIs, services, and infrastructure to enable TRM's AI systems to access external data sources safely and efficiently. Working closely with cross-functional teams, you will translate integration needs into production-grade systems, enhancing the speed, quality, and reliability of TRM's connections to external intelligence sources to support the mission of building a safer financial system.

$100k - $120k

Chai Discovery

Chai Discovery is building the computer-aided design suite for molecules, used by major pharmaceutical companies to power drug discovery programs. AI is revolutionizing life sciences, and our team is at the forefront of this transformation. We train frontier models that understand the fundamental principles of biochemical structure and interaction, coupled with a computational workspace that enables scientists to iterate on molecules from concept to medicine. This accelerates the development of novel therapeutics. This role focuses on building the AI platform that empowers scientists to direct research programs using agents. As Chai's models advance, scientists will increasingly focus on core scientific problems and hypotheses, delegating subtasks to intelligent agents. This requires creating innovative abstractions that facilitate seamless collaboration between people, agents, and Chai's foundation models.

Salary not listed

Simple AI

Simple AI is seeking an AI Agent Engineer to join their growing team and help build state-of-the-art voice AI agents for enterprise clients. This role involves working directly with customers to transform Simple's voice AI platform into production-ready agents tailored to each business's unique needs. You will engage in both pre-sales and post-sales activities, including creating custom demos, understanding customer workflows, deploying agents, debugging complex issues, enhancing performance, and translating customer feedback into product enhancements. This is a highly technical and customer-facing position for individuals who enjoy coding, interacting with clients, working at a fast pace, and seeing the direct business impact of their work.

$120k - $200k

As a Deployed Engineer, you will work on challenging applied AI problems, focusing on production systems that support real-world missions for defense, civilian, and intelligence customers. You will help design, deploy, and operate AI agents within secure, regulated, and high-stakes environments. This role offers a fast feedback loop, tangible mission impact, and the opportunity to directly influence the deployment of AI agents across the federal landscape. You will operate in environments demanding security, reliability, compliance (FedRAMP, IL levels, etc.), and operational rigor, working closely with government engineers and system integrators throughout the entire lifecycle.

$185k - $300k

Moveworks is seeking a Senior Staff Software Engineer to join our Agentic AI Harness & Quality team. This role is for experienced software engineers looking to apply their skills at the forefront of AI agents. You will play a crucial part in advancing the capabilities and reliability of AI agents for enterprise use at scale. You'll contribute to the evolution of our AI Assistant platform, focusing on areas like agent orchestration, secure code execution, performance optimization, agent memory, LLM self-reflection, and knowledge graphs. You will leverage modern enterprise AI tools, including leading LLMs, and work within a team that prioritizes rapid development, scalable infrastructure, and pushing the boundaries of AI value for customers.

Salary not listed