Senior AI Platform Engineer at AlphaSense | San Francisco

About AlphaSense: AlphaSense is the go-to platform for the world's most advanced companies, helping them eliminate uncertainty in decision-making through unparalleled market intelligence and AI-driven search capabilities. Our trusted insights derive from a vast universe of both public and private content, including equity research, company filings, event transcripts, expert calls, news, trade journals, and proprietary client research.With the recent acquisition of Tegus in 2024, AlphaSense is poised to further enhance our mission of empowering professionals to make informed decisions using AI-enhanced market intelligence. This collaboration will drive growth, innovation, and content expansion, providing users with deeper insights across an extensive array of content sets. We proudly serve over 6,000 enterprise customers, including most of the S&P 500. Founded in 2011 and headquartered in New York City, we have grown to over 2,000 employees with offices in the U.S., U.K., Finland, India, Singapore, Canada, and Ireland. Join us!About the Team:Our diverse Product & Engineering team is committed to fostering innovation, collaboration, and ongoing improvement of our platform. We provide a dynamic work environment that encourages growth and allows employees to work with cutting-edge technology shaping the future of AI and search.At AlphaSense, we celebrate diverse experiences and perspectives, ensuring our workplace is inclusive and empowering for all employees to express their authentic selves.About the RoleWe are in search of a seasoned engineering leader to revolutionize the development and operation of AI-powered systems on a large scale. You will be part of a talented team of engineers who have created leading-edge AI applications. Your objective will be to implement world-class engineering practices that ensure the reliability of these innovations for our enterprise clientele.This role presents a unique opportunity for an experienced engineer who excels in building robust platforms, mentoring talented teams, and establishing engineering excellence. You will enjoy significant autonomy in shaping our technical architecture while working with cutting-edge AI models and agentic systems that empower market intelligence for some of the world's leading organizations.

Responsibilities:Develop Our Product. Take ownership of software features that enhance our AI platform, empowering private market investors to analyze deals swiftly and accurately. This role requires you to actively engage in coding and delivering essential platform components from the ground up.Ensure Quality and Excellence. Establish and maintain coding standards, architectural guidelines, and review procedures; mentor fellow engineers. Co-cultivate a culture centered on practical, reliable, and test-driven development that swiftly meets business requirements.Scale for Growth. Assist in monitoring and scaling the architecture of our platform and its infrastructure.Collaborate Across Functions. Engage closely with product, security, and go-to-market teams to translate our strategic roadmap into actionable features and deliverables.

Join Our Team at Hayden AIAt Hayden AI, we are dedicated to revolutionizing public transit and government operations through innovative computer vision technologies. Our mission is to tackle real-world challenges faced by transit systems, enabling them to enhance safety, optimize transportation, and contribute to a sustainable future.We develop advanced mobile perception systems designed to improve transit flow and street safety. As a part of our dynamic team, you will work at the forefront of technology, utilizing AWS and GCP cloud services while developing cutting-edge Linux-based edge devices.Role OverviewWe seek an enthusiastic Senior Software Engineer to enhance our data platform, ensuring it is reliable, scalable, and high-performing. In this role, you will design and construct core data infrastructure, optimize data pipelines, uphold data quality standards, and collaborate closely with product and data science teams to deliver transformative data solutions that drive business insights.

Join Perplexity as a skilled Software Engineer, where you will play a pivotal role in developing the next-generation AI Foundation and Platform. Our mission is to transform how individuals search and engage online. In this exciting position, you will contribute to building Perplexity's comprehensive AI data, evaluation, and personalization infrastructure, which underpins nearly all of our agent products.Technology Stack: Spark | AWS Data Stack (S3, RDS, DynamoDB, Docker, EKS, Kinesis) | Pytorch | Databricks | Snowflake | LLM APIsAs we continue to expand our user base and diverse use cases, our data stack ensures that millions around the globe receive fast, personalized answers.

Join Flux: Revolutionizing Hardware EngineeringAt Flux, we are transforming the landscape of hardware engineering with our pioneering AI Hardware Engineer. Our mission is to empower innovators worldwide to design and build cutting-edge hardware effortlessly.Your RoleAs a Senior Platform Engineer, you will be at the forefront of developing robust systems that enhance the Flux platform. You'll be responsible for crucial functionalities beyond the editor, including billing, authentication, onboarding, and integrations.Your contributions will directly impact every user, ensuring seamless operations and enabling Flux to scale efficiently.Core ResponsibilitiesDevelop and sustain user-centric platform features, such as billing, authentication, onboarding, and settings.Integrate and manage third-party APIs including Stripe, Firebase, and various analytics tools.Create backend services using TypeScript/Node.js and develop frontend components with React.Enhance the reliability and performance of essential platform workflows.Establish standards for observability, logging, and error tracking.Collaborate with cross-functional teams to design APIs that enable new products and integrations.Document architecture and best practices within your domain.

Join a pioneering team of former Google engineers who have developed ground-breaking defensive technologies, such as Safe Browsing and reCAPTCHA. We are on a mission to confront an urgent challenge: combating the rising tide of adversarial AI attacks that threaten organizations globally.Operating in stealth mode, we are targeting a lucrative $5B+ market that is primed for innovation. Conventional detection methodologies are proving inadequate against the speed and sophistication of AI-driven assaults. Current adversaries are leveraging AI to engineer tailored, high-evasion attacks, leaving traditional systems vulnerable.Your Role:You will design a network of AI agents that are rapid, cost-effective, and precise, collaborating to identify and neutralize emerging threats. Your work will dive deep into real-time threat data, continuously evolving your agents in a fast-paced environment. These agents will function under an orchestration layer that fosters quick adaptation and learning.The Excitement of the ChallengeRapidly Evolving Models: The landscape changes daily; solutions that worked yesterday may be outdated today.Intelligent Adversaries: We are engaged in a real-time arms race against cunning, AI-enhanced attackers crafting sophisticated payloads.No Existing Playbook: We are forging new detection paradigms as swiftly as threats evolve. This high-stakes work places you in the heart of the action from day one.If you thrive on solving challenging problems with rapid feedback, this is your opportunity.Why We Are Positioned to SucceedExpansive Market: The market is vast at $5B and expanding quickly, while established players struggle to adapt.Proven Track Record: Our team has previously developed the foundational technology for Safe Browsing (serving over 5B users) and reCAPTCHA (protecting more than 5M websites) during our time at Google.Experienced Team: This is our third endeavor in creating a category-defining security enterprise, and we know how to scale our technology and our organization effectively.Deeply Integrated AI and Security: We embed AI from the outset rather than layering it on top.Top Talent: We hire only the highest achievers; many on our team were in the top 1% of engineers at Google. If you excelled in your previous role, you will fit right in.Agility: We prioritize speed and efficiency in everything we do.

Join our innovative team at Harvey as a Software Engineer focusing on our AI Platform. In this role, you will leverage cutting-edge technologies to develop and enhance AI-driven solutions that empower our users and transform industries. You will collaborate with cross-functional teams to design robust software architectures and implement scalable solutions that meet the needs of our diverse clientele.

About AbridgeFounded in 2018, Abridge is dedicated to enhancing comprehension in healthcare through innovative technology. Our AI-driven platform is specifically designed for medical conversations, streamlining clinical documentation while allowing clinicians to prioritize what truly matters—their patients.Our cutting-edge technology converts patient-clinician discussions into structured clinical notes in real-time, seamlessly integrating with electronic medical records (EMR). Leveraging Linked Evidence and our unique, verifiable AI, we are the only organization that correlates AI-generated summaries with ground truth, enabling providers to trust and verify outcomes swiftly. As trailblazers in generative AI for healthcare, we are establishing industry standards for the ethical use of AI across health systems.We are a diverse team of practicing MDs, AI experts, PhDs, creatives, technologists, and engineers united in our mission to empower individuals and simplify healthcare. Our offices are located in the vibrant Mission District of San Francisco, SoHo in New York, and East Liberty in Pittsburgh.The RoleAs Abridge expands, we seek skilled Platform Engineers to join our team and enhance our cloud infrastructure and developer experience. You will be a vital member of a centralized Platform team, focusing on platform development, adoption, and ongoing support of existing tools and software. This role is primarily infrastructure-oriented (80%) with a smaller focus on application software (20%).Your responsibilities will include transforming our infrastructure stack to be multi-tenant and multi-cloud, implementing and promoting cloud security practices, managing modular Terraform, and integrating new cloud infrastructure into our production stack for scalability. Additionally, you will develop service templates and various developer tools, including canary releases, feature flagging, load testing, CI/CD pipelines, and more.The platform we are creating aims to enhance both engineering speed and security, accommodating substantial scale while offering numerous opportunities for creativity, autonomy, and leadership in taking projects from inception to completion. This is a unique chance to accelerate your career within a rapidly growing company using the latest technologies.

About HyperspellHyperspell is revolutionizing the Memory & Context Layer for AI Agents.AI agents are brilliant yet lack context.While AI agents excel in standardized testing, they struggle with real-world applications. Today's cutting-edge agents lack the contextual understanding that humans naturally acquire through diverse interactions. This context evolves with their tasks.Hyperspell empowers AI agents with contextual awareness by integrating with users' workspace data, creating a tailored memory and context layer.Our ValuesWe are committed to shaping the future through bold innovations. Our goal is to establish ourselves as the indispensable context layer for organizations, enabling all their AI agents to connect seamlessly. We embark on this journey not because it is easy, but because it is significant.We prioritize care — for our customers, their success, the future of AI, and most importantly, for one another. As we build the frontier of AI, we strive to be one of the most technologically advanced yet profoundly human companies in history — a place where we can enjoy shaping the future together.Our InvestorsOur vision is supported by esteemed investors such as Y Combinator, Afore Capital, Scribble Ventures, and Pioneer Fund. Our angel investors include leading figures from OpenAI, Anthropic, xAI, and DeepMind, alongside respected founders from Silicon Valley like Siqi Chen (Runway) and Julian Weisser (On Deck).Our FoundersFounded in 2024 by Conor Brennan-Burke and Manu Ebert, Hyperspell is driven by experienced leaders. Conor previously spearheaded growth at Checkr, overseeing a $30 million API product portfolio and earning the title of 'the most helpful founder in YC'.Manu brings over 15 years of expertise in machine learning and AI, having successfully sold two companies and led high-growth engineering teams at Airbnb. Interestingly, he acquired his first .ai domain in 2014, needing to send a fax to the domain authority in Anguilla to do so.About the RoleAs our founding platform engineer, your mission will be to construct the infrastructure that makes Hyperspell feel magical — swift, dependable, and effortlessly scalable. You will be responsible for the foundation upon which our entire product is built, ensuring that when customers entrust us with their data, we uphold their trust.

About Quizlet:At Quizlet, we strive to empower every learner to achieve their goals in the most effective and enjoyable manner possible. Our $1 billion-plus learning platform caters to tens of millions of students each month, including two-thirds of U.S. high schoolers and half of U.S. college students, facilitating over 2 billion learning interactions monthly.We merge cognitive science with innovative machine learning techniques to personalize and enhance the educational experience for students, professionals, and lifelong learners alike. Our enthusiasm lies in our potential to support a diverse range of learners through various approaches and tools.Let’s Shape the Future of Learning TogetherJoin us in designing and delivering cutting-edge, AI-driven learning tools that scale globally and unlock human potential.About the Team:The AI & Data Platform team is dedicated to creating and maintaining a robust, scalable, and efficient foundation for all data and machine learning operations at Quizlet. This team is the cornerstone of our AI aspirations. As we unify our AI initiatives to develop a powerful product portfolio, the platform team focuses on achieving operational excellence. We actively adopt and optimize the best MLOps and DataOps technologies to expedite innovation throughout Quizlet.About the Role:As a Senior AI & Data Platform Engineer, you will play a vital role in crafting Quizlet’s next-generation analytical data and machine learning architecture. Collaborating with teams across Data Science, ML Engineering, and Product, you will deliver scalable, dependable, and efficient systems that support the development and deployment of AI-enhanced features.Your success will be evaluated based on platform reliability, developer experience, and adoption across teams. This position offers the chance to work with state-of-the-art technologies and contribute to the foundational infrastructure that drives Quizlet’s AI roadmap.We are excited to inform you that this is an onsite position located in our San Francisco office. To encourage team collaboration, we require employees to be in the office at least three days a week: Monday, Wednesday, and Thursday, along with any additional days as requested by your manager or the company. We believe this work environment enhances productivity, fosters team synergy, and supports both employee and organizational growth.

About StackAIStackAI is a revolutionary no-code AI workflow platform that enables businesses to construct, implement, and expand AI-driven workflows without requiring extensive machine learning expertise. With a growing user base and increasing enterprise adoption, our goal is to democratize access to large language models (LLMs), empowering every business operator—beyond just developers. Supported by Y Combinator and top-tier investors, we are laying the groundwork for the AI-driven future of work.The RoleAs a Senior Full Stack Engineer, you will be instrumental in defining the product and technical architecture at StackAI. Your responsibilities will span the entire technology stack, from crafting scalable backend systems to creating stunning and user-friendly frontend interfaces, and incorporating advanced AI models into our platform. This role offers significant impact, as you will work closely with the founding team, take charge of essential product features, and shape the engineering culture of a rapidly evolving startup.We seek exceptional 10X engineers—innovative builders who can consistently deliver results in a dynamic environment, remain inquisitive, and excel in diverse roles.ResponsibilitiesIn this role, you will:Build and own the entire platform, from backend services and APIs to frontend interfaces.Create robust, scalable backend systems utilizing Python and FastAPI (or similar), with optimized databases (SQL/NoSQL).Design and maintain high-quality user interfaces using React, Next.js, TypeScript, and Tailwind CSS, ensuring polished, intuitive, and responsive user experiences.Integrate new AI models and features into our products for seamless performance and enhanced value.Manage StackAI’s landing and product pages to establish benchmarks for clarity, design, and quality.Collaborate across the stack to connect backend services with frontend applications seamlessly.Engage with design, product, and customers to refine product direction and prioritize user needs.Stay at the forefront of full-stack technologies, promoting best practices and innovative solutions.Assist with customer support as needed; every team member contributes to user satisfaction.

Join Our MissionAt Unlearn, we are revolutionizing clinical development to create smarter trials. Our innovative use of data, artificial intelligence, and digital twins accelerates the process of delivering life-saving treatments to patients. This vision fuels our collaboration with biopharmaceutical companies as we transform the planning, execution, and analysis of clinical trials.We are setting the standard for the future of clinical development by leveraging unparalleled scientific credibility and AI-driven precision, making decision-making clearer and trials more robust. Our goal is not just to disrupt the pharmaceutical landscape but to foster meaningful change.We firmly believe that AI will shape the future of medicine, and we are dedicated to cultivating that future in a responsible and collaborative manner with our clinical development partners.About Our TeamOur team embodies a diverse range of expertise, from machine learning to marketing, yet all Unlearners share core attributes:Ambitious: We embrace challenging goals without hesitation.Disciplined Experimenters: We break down larger objectives into manageable tasks, meeting frequently to monitor progress and iterate swiftly.Gritty: We are resilient; setbacks only motivate us to strive harder.Receptive to New Ideas: We resist complacency and welcome innovative thinking.Storytellers: We prioritize sharing information effectively, ensuring it is engaging and informative.Team-Oriented: Our mission takes precedence over everything; we prioritize the company and team over individual pursuits.Founded in 2017 and headquartered in San Francisco, Unlearn has attracted top-tier investors such as Altimeter, Insight Partners, Radical Ventures, 8VC, DCVC, and DCVC Bio, successfully completing a $50 million Series C funding round in January 2024.If our mission and culture resonate with you, we encourage you to apply.

Join the Revolution at Retell AIRetell AI is pioneering the future of call centers through innovative voice AI, driven by first principles thinking.In just 18 months since our inception, we have empowered thousands of businesses with our AI voice agents, transforming how sales, support, and logistics calls are managed—previously requiring extensive human teams. Supported by prestigious investors such as Y Combinator and Alt Capital, we've rapidly scaled from $5M ARR to an impressive $36M ARR with a compact yet dynamic team of 20.Our ambition for 2026 is to create a revolutionary customer experience platform, where entire contact centers are powered by AI. Moving beyond basic automation, we aim to develop intelligent AI “workers” that serve as frontline agents, QA analysts, and managers, continuously enhancing customer interactions without the need for constant human oversight.As we expand, we are seeking passionate engineers who are eager to solve challenging technical problems, act swiftly, and make a significant impact in one of the fastest-growing voice AI startups. Let’s shape the future together.

About UsAt Speak, we are on a mission to transform the way individuals engage with language learning.Learning a new language has the power to transform lives, unlocking opportunities in diverse cultures, careers, and communities. With two billion people globally seeking to learn a language, the most effective method—one-on-one tutoring—remains difficult to access on a large scale and has seen little innovation for decades. Speak is pioneering an AI-driven, human-level tutoring experience that fits in your pocket: a conversation-first platform enabling learners to practice speaking, receive immediate feedback, and advance through meticulously crafted lessons. Our approach provides a comprehensive journey from novice to confident speaker in multiple languages.Launched in South Korea in 2019, Speak has quickly risen to become the leading language learning application in the region, catering to learners across various markets in over 15 languages. As one of the foremost AI companies globally, we have secured over $150 million in venture capital from prominent investors such as OpenAI, Accel, Founders Fund, and Khosla Ventures, with a distributed team operating across San Francisco, Seoul, Tokyo, Taipei, and Ljubljana.About This RoleAs a Platform Engineer at Speak, you will play a pivotal role in enhancing the reliability and resilience of our systems that support the global language learning experience. You will lead initiatives to scale our infrastructure, fortify our platform, and ensure our services are fast, accessible, and dependable for millions of users worldwide.Your work will span our entire tech stack—from Kubernetes on GCP to our Node.js APIs, Postgres, and Redis—creating robust infrastructure and operational tools. You will take charge of incident response, observability, and SLOs, fostering a culture of reliability throughout the engineering organization.With Speak's rapid growth, we are continuously pushing our systems to their limits. This is a unique opportunity to influence the future of our platform as we scale to accommodate the next tenfold increase in users.

Join Our Innovative Team at Retell AIRetell AI is at the forefront of revolutionizing the call center industry through advanced voice AI technology. In just 18 months since our inception, we have empowered thousands of businesses to optimize their sales, support, and logistics calls, which previously relied on large teams of human agents. Supported by prominent investors including Y Combinator and Alt Capital, we've achieved remarkable growth, scaling from $5 million to $36 million in annual recurring revenue (ARR) while expanding our talented team to 20 members.Our ambitious vision for 2026 is to develop a state-of-the-art customer experience platform, transforming entire contact centers with AI. Unlike traditional automation that requires ongoing human oversight, we are building intelligent AI "workers" capable of functioning as frontline agents, quality assurance analysts, and managers, constantly enhancing customer interactions.If you are a passionate innovator eager to solve complex technical challenges and make a tangible impact at one of the fastest-growing voice AI startups, we invite you to join us in shaping the future.Ranked among the top 50 AI applications by a16z: a16z List4th on Brex's Fast-Growing Software Vendors of 2025: Brex BenchmarkFeatured as a leading startup on: Leanaileaderboard

About Brain Co.At Brain Co., we are pioneering the infrastructure that transforms cutting-edge AI research into impactful real-world applications. We operate at the forefront of making AI viable in complex, high-stakes environments, especially within government and regulated sectors where manual processes are still prevalent.Our mission is to ensure that AI systems are reliable, scalable, and trustworthy in practical settings. This entails advancing beyond mere demonstrations and models to create robust platforms that facilitate intricate workflows, human-in-the-loop processes, and production-grade reliability at scale.About the RoleAs an AI Platform Backend Engineer, you will be responsible for developing and managing the core backend systems that drive Brain Co.’s AI platform. This is a strategic and high-impact role: your contributions will empower product teams, ML engineers, and customer implementations to operate more effectively and securely.You will design and oversee backend services that facilitate complex AI workflows (including multi-step reasoning, tool usage, and human-in-the-loop processes), emphasizing scalability, reliability, and user experience. Your journey will take systems from initial technical exploration to production deployment, often navigating ambiguous challenges where your insights will shape optimal solutions.This position provides considerable autonomy and the potential to evolve into broader technical and organizational leadership roles over time.

Join Our Innovative Team at Simple AIAt Simple AI, we are transforming enterprise communications through cutting-edge voice AI agents. Our highly realistic agents empower leading companies such as DoorDash, xAI, and Omaha Steaks to efficiently manage a variety of phone operations, including customer support, order processing, and lead qualification.As we experience exponential growth and a surge in customer demand, we are seeking a few founding software engineers to help us navigate this exciting journey and develop systems for the future. Our passionate team operates from our vibrant San Francisco office five days a week, driven by a shared vision of leveraging AI to make a significant impact in the world.We are proud to be backed by esteemed investors and operators, including Y Combinator, Massive Tech Ventures, and industry leaders such as Michael Seibel (Twitch), Jared Friedman (Scribd), and more.

fractional-ai is looking for a Senior or Staff Software Engineer to join the San Francisco office. This position centers on building advanced AI solutions with a team that values both technical depth and collaboration. Role overview This role focuses on designing and developing AI-driven systems. The work involves solving technical challenges and contributing to projects that push the boundaries of what AI can achieve. Collaboration with other engineers and stakeholders is a key part of daily responsibilities. Who will thrive Experienced engineers with a strong background in software development Those who enjoy working on complex technical problems Individuals who value teamwork and open communication Location This position is based in the San Francisco office.

Why Join Flux?At Flux, we are simplifying the complexities of hardware development by pioneering the world’s first AI Hardware Engineer. Our mission is to democratize access to cutting-edge hardware technology and transform the global landscape of electronics design and manufacturing.About the PositionAs a Platform Engineer at Flux, you will play a crucial role in ensuring that our platform operates seamlessly. Your work will extend beyond the editor, encompassing essential features such as billing, authentication, onboarding, and integrations.You will be responsible for delivering features that enhance user experience, maintaining operational integrity, and facilitating the scalability of Flux’s platform.Key ResponsibilitiesDevelop and sustain user-centric platform functionalities (billing, authentication, onboarding, settings).Integrate and sustain third-party APIs (e.g., Stripe, Firebase, analytics).Create backend services using TypeScript/Node and frontend components with React.Enhance the reliability and performance of core platform functionalities.Implement standards for observability, logging, and error tracking.Collaborate with cross-functional teams to design APIs that support new products and integrations.Document architecture and best practices pertinent to your domain.Required QualificationsMinimum of 5 years of professional software engineering experience.Proficiency in TypeScript, Node.js, and React is essential.Experience in integrating and maintaining third-party APIs is required.Demonstrated success in deploying full-stack web applications.Familiarity with cloud hosting environments (GCP/AWS/Firebase) and basic CI/CD practices.Strong debugging and cross-system troubleshooting capabilities.Excellent communication skills, both written and verbal; ability to thrive in asynchronous, remote team settings.Preferred QualificationsExperience with multi-tenant SaaS applications or collaborative web platforms.Familiarity with authentication frameworks (OAuth, JWT, Firebase Auth).Experience with observability tools (Sentry, Datadog, Grafana).Background in developing internal tools or administrative dashboards.

Join Trunkio, where our mission is to enable teams to develop high-quality software swiftly. We have collaborated with engineering teams at top-tier companies like Google X, Zillow, and Brex to identify build failures, manage flaky tests, and enhance code deployment speed without compromising reliability. Although AI has accelerated code writing, the delivery process remains a challenge due to merge conflicts, inconsistent code quality, and other productivity-draining issues. Our goal is to help engineering teams focus on the design, implementation, and delivery of exceptional software, resulting in more fulfilling work experiences. We are currently developing a CI Reliability Platform that empowers teams to deliver code efficiently.Founded in 2021 by industry veterans from Uber, Google, YouTube, and Microsoft, Trunkio has successfully raised a $25M Series A led by Initialized Capital and a16z, with backing from notable investors including Haystack Ventures and the creators of GitHub, Apollo GraphQL, and Algolia.We are seeking a passionate and skilled Senior Software Engineer to join our Platform/Data Engineering team. In this pivotal role, you will design and optimize data ingestion pipelines to manage large volumes of real-time and batch data from diverse sources. Your expertise will be vital in creating systems that are scalable, reliable, and performant, while also ensuring seamless data integration across our ecosystem.