AI Startup Jobs

Tenstorrent is seeking a C++ Machine Learning Engineer to join their AI Models team. In this role, you will work on the training framework for advanced AI models, focusing on writing high-performance C++ code, implementing new layers and operators, and scaling models across custom silicon. This is an opportunity to build the core components of ML systems and optimize their performance. The company values collaboration, curiosity, and a passion for solving complex AI challenges.

Salary not listed

Join Tenstorrent’s AI Models team and work at the layer most ML engineers never see: bringing advanced models to life on custom AI hardware. You’ll own real workloads end‑to‑end including porting, tuning, and validating LLMs and vision models on our accelerator, and chasing down every last millisecond and percentage point of accuracy. This role is for people who love the craft of ML engineering and want their work to matter at silicon scale, not just behind another API. This role is hybrid, based in Cyprus. We welcome candidates at various experience levels for this role. During the interview process, candidates will be assessed for the appropriate level, and offers will align with that level, which may differ from the one in this posting.

Salary not listed

Perplexity AI

This role is for experienced software engineers looking to build AI-powered products. You will own user-facing surfaces end-to-end, from interaction design and frontend development to application logic, APIs, data models, and the underlying search or model calls. The team continuously ships to production, with new engineers often having code in front of users within their first week. You will leverage AI, including agents and coding models, as primary tools to accelerate development and improve product quality, focusing on reliability, latency, and craft. This is a full-stack position that suits individuals who enjoy building and have the autonomy to do so, with a focus on turning ambiguous product ideas into working prototypes and iterating based on usage data and evaluations.

$180k - $270k

Together AI

Together AI is building the AI Native Cloud, an end-to-end platform for the full generative AI lifecycle, combining the fastest LLM inference engine with state-of-the-art GPU cloud infrastructure. The Together Cloud team builds the flagship IaaS product that provides high-performance, AI-ready GPU clusters through a self-serve cloud console, along with the virtualized infrastructure layer powering Together's inference, RL, and fine-tuning products. As a Staff Software Engineer focusing on AI Compute, you will set technical direction for and build major components of the next generation AI cloud platform – a highly available, global cloud infrastructure with cutting-edge virtualization of the latest ML hardware. This is an architect-and-build role where you will set the architecture for automated bootstrapping of GPU data centers, high-performance virtualization, and fault-tolerant decentralized control planes, and be a key owner of the hardest parts, in the code as well as the design. Your designs will span the IaaS layer up to the global management plane that schedules capacity across all data centers. At this level, the job is as much leverage as code: the standards you set and the engineers you grow decide how fast the rest of Together Cloud ships.

$260k - $300k

Sierra

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 a culture guided by values of Trust, Customer Obsession, Craftsmanship, Intensity, and a commitment to balancing family. Our Tech, Media & Telecom team builds AI agents for critical moments, such as service disruptions or major product launches, to enhance customer relationships across telecommunications, media, and technology sectors. These agents aim to personalize experiences, optimize plans, drive engagement, and improve customer loyalty.

$180k - $390k

Arize AI

Arize AI is seeking an AI Education Engineer focused on developer growth to join their product team. This role is part of developer advocacy, connecting the product with the AI Engineer ecosystem. The ideal candidate will have an entrepreneurial mindset and a passion for growing the developer community through code, education, content, and hackathons. You will collaborate with engineers, product managers, and marketing professionals to build the next generation of AI systems, including agents, assistants, and LLM applications.

$100k - $175k

Together AI

Together AI is building the AI Native Cloud, an end-to-end platform for the full generative AI lifecycle, combining a fast LLM inference engine with state-of-the-art GPU cloud infrastructure. The Together Cloud team builds the flagship IaaS product that provides high-performance, AI-ready GPU clusters through a self-serve cloud console, along with the virtualized infrastructure layer powering Together's inference, RL, and fine-tuning products. As a Senior Software Engineer focusing on AI Compute, you will build and own major components of the next generation AI cloud platform – a highly available, global cloud infrastructure with cutting-edge virtualization of the latest ML hardware. This virtualized computing platform powers our own SaaS products and serves external cloud customers through self-serve offerings. The hard problems in rapidly scaling heterogeneous GPU fleets are software problems that we solve by building global and in-DC services, Kubernetes operators, and high-performance SDN libraries, forking hypervisors and Linux kernels, and building infra tailored to inference and fine-tuning. You'll own massive greenfield projects across their full lifecycle – scoping the problem, designing the system, and building it through to GA launch.

$220k - $270k

Sierra

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 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 tech companies like Salesforce, Facebook, and Google. The Travel, Transportation and Hospitality (TTH) team specifically supports major players in the travel industry, helping them deliver exceptional customer experiences, drive growth, and build innovative products. This is a small, scrappy, and collaborative team where every member is encouraged to think like a product owner and contribute to shaping the future of AI in travel.

$180k - $390k

Arize AI

Arize AI is seeking an Applied AI Engineer focused on developer growth to join their product team. This role is ideal for individuals with an entrepreneurial mindset who are passionate about growing the developer community through code, education, content, and hackathons. You will work with a team of engineers, product managers, and marketers experienced in building next-generation AI systems, including agents, assistants, and LLM applications. The position connects product strategy with the AI engineer ecosystem, aiming to empower AI engineers to ship high-performing, reliable agents and applications.

$100k - $175k

Sierra

Sierra is seeking a Software Engineer to join its Financial Services team, focusing on building customer-facing AI agents for major brands. This role involves designing, delivering, and iterating on production-grade AI agents that are mission-critical and drive revenue. You will own the Agent Development Life Cycle (ADLC) from pilot to deployment, working directly with enterprise clients and startups to solve complex business challenges. Your work will directly influence the evolution of Sierra's core platform, shaping the future of AI agent development. The team partners closely with financial institutions to transform customer experiences, making the industry more accessible, human, and affordable.

$180k - $390k

Sierra

Sierra is a leading platform for customer-facing AI agents, partnering with major global brands to revolutionize customer service and business growth. We are an in-person company based in San Francisco with a culture guided by trust, customer obsession, craftsmanship, intensity, and a commitment to work-life balance. Our co-founders, Bret Taylor and Clay Bavor, bring extensive experience from leading tech companies like Salesforce, Facebook, and Google. The Retail Team specifically focuses on reinventing AI-first commerce for renowned brands such as Gap, Wayfair, and Sonos, handling millions of customer interactions annually across various channels. We aim to create seamless experiences that resolve issues, drive revenue, and build lasting customer loyalty.

Salary not listed

Arize AI

Arize AI is the leading AI & Agent Engineering observability and evaluation platform, empowering AI engineers to ship high-performing, reliable agents and applications. As the AI landscape shifts from traditional ML to generative AI and agentic systems, Arize ensures teams have the tools to monitor, troubleshoot, and improve AI in production. The Fullstack Engineering team builds both the highly scalable distributed services that power Arize's ML observability platform and the intuitive frontend applications that bring these capabilities to life, focusing on delivering robust features that help clients interpret, visualize, and monitor their AI and ML models across the entire stack.

$125k - $225k

Sierra

Sierra is seeking a Software Engineer to join its Public Sector team, focusing on designing and building production-grade AI agents for government institutions. This role involves close collaboration with industry leadership to shape market strategy and product development, as well as working directly with public sector customers to understand their needs and identify opportunities for AI to improve citizen services and government operations. The position offers a unique opportunity to influence the evolution of Sierra's core platform by surfacing unmet needs and prototyping new features, contributing to the future of AI agent development within the public sector.

$180k - $390k

Arize AI

Arize AI is seeking a Senior AI Product Engineer, Backend to join their core team driving product innovation. This role involves building and optimizing the highly scalable distributed services that power Arize's AI and Agent Engineering observability and evaluation platform. You will work on challenging technical problems, from efficient metric computation across billions of data points to designing next-generation OLAP database architectures and implementing advanced dimensionality reduction techniques. The position offers the opportunity to understand how leading engineering teams develop AI and LLM-powered applications and to build the tools that enable them to succeed.

$125k - $225k

Together AI

As a Research Intern in the Model Shaping team, you will contribute to advanced post-training methods, explore new techniques for efficient neural network training, and work on robust evaluation of foundation model capabilities. The Model Shaping team focuses on tailoring open foundation models for downstream applications, developing services for model selection and improvement, and creating new methods for efficient model training and evaluation. This role offers the opportunity to work on cutting-edge research, potentially leading to publications in top-tier conferences.

$58k - $70k

Sierra

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 a culture guided by values of Trust, Customer Obsession, Craftsmanship, Intensity, and a commitment to balancing family. Our Financial Services team works with systemically important banks, neobanks, and insurers, impacting millions of end customers and billions in economic activity. We build modern tools that address critical customer moments, making the financial industry more accessible, human, and affordable.

$180k - $390k

Arize AI

Arize AI is seeking an experienced Forward Deployed AI Engineer to join their client-facing team. This role involves working directly with client engineering teams to manage projects and drive technical solutions that extend beyond Arize's core platform. The position requires a blend of deep AI expertise and business acumen to deliver results under tight deadlines while fostering strong client relationships. While the company operates as remote-first, candidates must be based in the San Francisco Bay area/PST time zone for this specific role.

$155k - $190k

Together AI

As a Research Intern in the Model Shaping team, you will contribute to advanced post-training methods, explore new techniques for efficient neural network training, and work on robust evaluation of foundation model capabilities. The Model Shaping team focuses on tailoring open foundation models for downstream applications, developing services for model selection and improvement, and creating new methods for efficient model training and evaluation. This role offers the opportunity to work on cutting-edge research, potentially leading to publications in top-tier conferences.

$58k - $70k

Sierra

Sierra is a leading platform for customer-facing AI agents, partnering with major global brands to transform customer service and business growth. We are 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 have extensive experience from leading tech companies like Salesforce, Facebook, and Google. The Healthcare team is focused on transforming the patient experience across the healthcare system, making care more accessible, human, and affordable through AI agents that handle sensitive conversations with empathy and compliance.

$180k - $390k

Together AI

As a Systems Research Engineer Intern specialized in GPU Programming, you will play a crucial role in developing and optimizing GPU-accelerated kernels and algorithms for ML/AI applications. You will co-design GPU kernels and model architecture to enhance the performance and efficiency of our AI systems, and contribute to the co-design of efficient GPU architectures and programming models. Your research skills will be vital in staying up-to-date with the latest advancements in GPU programming techniques, ensuring that our AI infrastructure remains at the forefront of innovation. This internship is based on-site at our San Francisco HQ, running through the Winter term from January to April.

Salary not listed

Together AI

As a Systems Research Engineer Intern specialized in GPU Programming, you will play a crucial role in developing and optimizing GPU-accelerated kernels and algorithms for ML/AI applications. You will co-design GPU kernels and model architecture to enhance the performance and efficiency of our AI systems, and contribute to the co-design of efficient GPU architectures and programming models. Your research skills will be vital in staying up-to-date with the latest advancements in GPU programming techniques, ensuring that our AI infrastructure remains at the forefront of innovation.

$121k - $146k

Together AI

Together AI is building the AI Acceleration Cloud, an end-to-end platform for the full generative AI lifecycle. The AI Infrastructure team is at the forefront of building and scaling the foundational systems that power our generative AI platform. The storage and observability team is crucial for designing, implementing, and maintaining robust distributed storage solutions, ensuring seamless data access and management. They are also responsible for developing comprehensive observability platforms, providing critical insights into system performance and GPU utilization, and proactively identifying and resolving issues.

$200k - $280k

Together AI

Together AI runs one of the largest GPU fleets globally, and the Infra Agent Systems team is responsible for developing the software that powers and automates this infrastructure. The team builds production AI agents designed to diagnose hardware failures, investigate incidents, correlate signals across the fleet, and automate operational workflows. Alongside these agents, they are building the core platform, which includes knowledge graphs, retrieval systems, orchestration frameworks, and developer tooling. This role offers the unique opportunity to work at the intersection of AI agents, distributed systems, infrastructure, and automation, tackling complex engineering challenges with significant real-world impact.

$250k - $300k

Together AI

Together AI is seeking a full-stack engineer to join their Product Engineering team. This role focuses on enhancing the developer experience across their AI platform, including surfaces like Playground, Model Garden, and Fine-Tuning. The ideal candidate is motivated by shipping impactful features that users value, working across the entire product lifecycle from data models to user interfaces. This is a high-ownership position on a fast-moving team where individual contributions are highly visible and directly influence product direction.

$160k - $230k