IT Security Engineer at Brain Co. | San Francisco

About Brain Co.At Brain Co., we are dedicated to developing cutting-edge AI systems that enhance critical workflows for some of the globe's most vital institutions. Our platform functions within high-stakes, highly regulated environments where security is not merely an add-on — it is a fundamental requirement.As a Security Engineer at Brain Co., you will be responsible for designing and building the security architecture that safeguards AI systems deployed within government entities, energy providers, and healthcare organizations. Your work will span cloud infrastructure, application layers, and compliance-driven environments, ensuring our platform remains secure by default, auditable, and resilient at scale.This role is pivotal within our Platform organization. You will collaborate closely with teams in Infrastructure, AI/ML, and Product Engineering to integrate security into our system design, deployment, and operational processes — rather than applying it retroactively.

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.

About Brain Co.Brain Co. is a pioneering Applied AI startup founded by visionaries Elad Gil and Jared Kushner, with support from Silicon Valley's most influential builders, including Patrick Collison (CEO of Stripe) and Andrej Karpathy (Cofounder of OpenAI). We are dedicated to developing an AI platform and applications that address the world's most critical challenges, delivering tangible solutions to complex real-world issues. Our achievements to date include:Revolutionized construction permitting for a government agency, achieving an 80% speed increase and unlocking over $375 million in value.Enhanced supply chain efficiency for a major energy provider, reducing costs by 30% and achieving 99% reliability, thereby preventing over $100 million in losses.Improved hospital patient care across national health systems, resulting in 40% better health outcomes and 80% less administrative burden.Secured a $30 million Series A funding round from top-tier investors.Assembled a talented team of over 40 AI specialists from leading organizations such as Tesla, Google DeepMind, NVIDIA, and Databricks.At Brain Co., your contributions will have real-world applications, and you'll be empowered to take ownership from day one. We are rapidly growing and need exceptional talent to meet increasing demand.About The RoleAs an AI Product Engineer at Brain Co., you will be instrumental in creating and implementing cutting-edge software solutions that tackle real-world challenges. You will collaborate directly with clients to define product specifications and build solutions from the ground up. Your responsibilities will include designing robust front-end interfaces and developing scalable back-end systems, transforming innovative research into impactful applications for various government entities. This position offers you the chance to significantly influence the accessibility and efficacy of AI technologies.

About Brain Co.At Brain Co., we are at the forefront of artificial intelligence, developing innovative systems that facilitate mission-critical operations for some of the world's leading institutions. Our cutting-edge platform operates in high-security, high-stakes environments, where reliability, performance, and robust engineering practices are paramount.As an AI Platform Engineer specializing in Infrastructure, you will be instrumental in building and scaling the foundational platform that supports AI systems used in essential sectors, including government, energy, and healthcare. You will work within dynamic environments that span both cloud and on-premises settings, directly influencing our platform's reliability and performance, ensuring we meet the high standards required by our clients.This role is pivotal within our Infrastructure/Platform team. You will collaborate closely with engineering, AI/ML, and product teams to design scalable architectures, enhance our environments, optimize deployment processes, and guarantee the robustness necessary for enterprise and sovereign applications.

About Brain Co.At Brain Co., we are pioneering the integration of artificial intelligence into real-world applications, driving innovation and shaping the future across various sectors. Our mission is to leverage the transformative capabilities of AI to address pressing challenges in both governmental and industrial contexts where traditional manual processes still prevail.About the RoleWe are seeking a dynamic and detail-oriented Recruiting Coordinator on a contract basis to enhance our rapid hiring initiatives. This pivotal role will ensure a smooth and organized candidate journey, collaborating closely with recruiters, interviewers, and hiring managers to coordinate interviews, maintain operational systems, and create an exceptional candidate experience from initial contact through to in-person interviews.This hands-on role is ideal for individuals who thrive in a fast-paced environment, possess a passion for logistics, and are dedicated to making the hiring process feel personal, efficient, and professional. This is a contract position with the possibility of transitioning to a full-time role based on performance and business needs.

Join the Innovative Team at Brain Co.Brain Co. is a pioneering Applied AI startup co-founded by industry visionaries such as Elad Gil and supported by prominent figures from Silicon Valley, including Patrick Collison (CEO of Stripe) and Andrej Karpathy (Cofounder of OpenAI). We are dedicated to developing AI solutions that address critical challenges faced by important institutions globally.Our impactful projects have already demonstrated remarkable results:Automated construction permitting for a sovereign government, making processes 80% faster and unlocking over $375 million in value.Optimized supply chains for a leading global energy company, achieving 30% cost reduction and 99% reliability, saving over $100 million.Streamlined hospital patient care across national health systems, resulting in 40% better outcomes and reducing administrative workload by 80%.Raised a substantial $30 million in Series A funding from top-tier investors.Built a talented team of over 40 AI experts with backgrounds from Tesla, Google DeepMind, NVIDIA, and Databricks.At Brain Co., your designs will have a direct impact on the real world, enabling rapid deployment and innovation. We are experiencing rapid growth and are seeking exceptional individuals to take charge from day one.

About Brain Co.Brain Co. is an innovative Applied AI startup, co-founded by visionaries Elad Gil and Jared Kushner, with support from some of Silicon Valley's most influential entrepreneurs, including Patrick Collison (CEO of Stripe), Andrej Karpathy (Cofounder of OpenAI), Mike Krieger (CPO of Anthropic), Kevin Weil (CPO of OpenAI), and Aravind Srinivas (CEO of Perplexity). We are dedicated to creating an AI platform and applications that address critical challenges faced by the world's leading institutions, generating tangible impacts.Our achievements to date include:Automated construction permitting for a sovereign government, achieving 80% faster processing and unlocking over $375M in value.Optimized supply chains for a major global energy firm, resulting in 30% reduced costs and 99% reliability, thus avoiding more than $100M in losses.Enhanced hospital patient care across national health systems, yielding 40% improved outcomes and 80% less administrative workload.Successfully raised a $30M Series A funding round from top-tier investors.Assembled a diverse team of 40+ AI experts from industry leaders such as Tesla, Google DeepMind, NVIDIA, and Databricks.At Brain Co., your contributions will make a difference in the real world rather than remaining in theoretical research. We are moving quickly and seek extraordinary talent ready to take initiative from day one.About The RoleWe are in search of a Product Manager to join our expanding Product team, with the responsibility of fully owning a defined product area from the start. You will convert business challenges into Product Requirement Documents (PRDs), collaborate closely with engineering and design teams, and oversee the lifecycle of projects from development through launch and iteration.This position is perfect for someone who excels in fast-paced, early-stage settings, possesses the ability to bring clarity to uncertainty, and enjoys transforming complex concepts into straightforward, actionable plans. Success in this role will pave the way for greater product ownership and leadership opportunities in the future.Please note that this position will be filled through a referral-only network. We are not accepting unsolicited applications.Key Responsibilities:Take full ownership of a specific product area from discovery and scoping to design, development, and delivery.Draft precise PRDs and convert intricate problems into actionable technical specifications.Work collaboratively with engineering, design, and operations teams to swiftly deliver high-quality products.

Join Brain Co. as an AI/ML Engineer!At Brain Co., we are at the forefront of applied AI innovation, founded by visionaries Elad Gil and Jared Kushner. Our team, backed by prominent figures in Silicon Valley, is dedicated to addressing some of the world's most pressing challenges through our cutting-edge AI platform and applications. Our impact is tangible, demonstrated by our achievements such as:Accelerating construction permitting for a sovereign government by 80%, unlocking over $375 million in value.Reducing costs by 30% and achieving 99% reliability in supply chains for a leading global energy firm, thus preventing over $100 million in losses.Enhancing hospital patient care across national health systems with a 40% improvement in outcomes and 80% reduction in administrative work.Successfully raising $30 million in Series A funding from top-tier investors.Assembling a talented team of 40+ AI specialists from industry leaders such as Tesla, Google DeepMind, NVIDIA, and Databricks.At Brain Co., your contributions will have real-world applications and you will have the chance to drive impactful change from day one.Your Role as AI/ML EngineerAs an AI/ML Engineer, you will be pivotal in deploying advanced models that automate a variety of real-world issues across sectors including healthcare, government, and energy. You will transform groundbreaking research into practical solutions that can influence global institutions.Key Responsibilities:Innovate and Deploy: Design and implement advanced LLM models to address real-world challenges by automating complex manual processes across different sectors.Optimize and Scale: Develop scalable data pipelines, enhance model performance and accuracy, and prepare them for production deployment. Continuously monitor and maintain deployed models to ensure sustained value delivery to governments worldwide.Make a Difference: Engage in impactful projects that may include optimizing advanced energy systems, modernizing governmental workflows, and improving patient outcomes in progressive public healthcare systems. Your work will directly contribute to how AI can enhance the efficiency and effectiveness of critical services.

About Brain Co.Brain Co. is an innovative Applied AI startup co-founded by Elad Gil and Jared Kushner, supported by prominent figures in Silicon Valley such as Patrick Collison (CEO of Stripe), Andrej Karpathy (Cofounder of OpenAI), Mike Krieger (CPO of Anthropic), Kevin Weil (CPO of OpenAI), and Aravind Srinivas (CEO of Perplexity).We are dedicated to developing an AI platform and applications that address critical challenges faced by global institutions, creating tangible impacts on real-world issues. Our achievements include:Automating construction permitting for a government, enhancing processing speed by 80% and unlocking over $375M in value.Optimizing supply chains for a major global energy company, reducing costs by 30% while achieving 99% reliability and preventing losses exceeding $100M.Improving hospital patient care across national health systems, resulting in 40% better outcomes and reducing administrative work by 80%.Successfully raising a $30M Series A from top-tier investors.Building a skilled team of over 40 AI experts from leading organizations such as Tesla, Google DeepMind, NVIDIA, and Databricks.At Brain Co., your contributions will have a direct impact, as we prioritize rapid execution and are eager to welcome exceptional individuals who can take charge from day one.About the RoleWe are seeking a Full Cycle Technical Recruiter to spearhead the end-to-end hiring process for Brain Co.'s Engineering teams, specifically in AI/ML, AI Product, and AI Platform domains. You will collaborate closely with our in-house recruiting team and engineering leaders, including the Head of Engineering, to attract and secure top-tier technical talent — individuals who will shape the future of applied AI.This role transcends traditional recruiting; you will architect and propel our recruitment strategy — from developing outbound initiatives and refining our employer brand narrative to managing candidate experiences and negotiating complex offers across international markets.Joining our dynamic and trust-driven environment means that recruiting is viewed as a strategic advantage, and your efforts will significantly influence the quality and direction of Brain Co.'s technical team.Your ResponsibilitiesOversee full-cycle recruiting for AI/ML, AI Product, and AI Platform roles, from sourcing candidates through to offer acceptance.Collaborate with leadership to define hiring needs and establish effective interview processes.Enhance candidate experience to reflect our culture of speed, precision, and mission-driven values.

About Cogent SecurityCogent Security is pioneering the future of cybersecurity through Applied AI, creating advanced AI agents designed to combat rapidly evolving cyber threats. Our AI Taskforce analyzes vast datasets to neutralize potential breaches before they impact our clients.Our commitment to innovation combines cutting-edge research with practical application, ensuring our solutions are at the forefront of technology. In addition to our product development, Cogent Research acts as our applied AI laboratory, supplying the expertise required to create highly effective security workflows.Since our launch from stealth mode, Cogent has seen remarkable growth, collaborating with Fortune 500 companies to secure some of the most intricate production environments globally.Backed by Greylock, our team consists of exceptional talents from leading universities such as Stanford, Berkeley, and Carnegie Mellon, as well as high-growth companies like Scale AI and Tesla, and cybersecurity experts from stalwarts like Wiz and DeepMind.

About Cogent SecurityCogent Security is at the forefront of cybersecurity innovation, leveraging Applied AI to develop next-generation AI agents. In an era where cyber attacks evolve rapidly, our AI Taskforce analyzes vast amounts of enterprise data to proactively address vulnerabilities and prevent critical breaches.We combine pioneering research with practical execution, ensuring that our innovative solutions meet real-world challenges. Our Cogent Research division acts as our dedicated AI lab, driving the development of advanced security workflows.Since our emergence from stealth mode, we have rapidly grown, collaborating with Fortune 500 companies to secure complex production environments globally.Supported by Greylock, we have gathered a team of top talent from renowned institutions and leading organizations in the AI and cybersecurity sectors.About the RoleAs an Agent Engineer at Cogent Security, you will be pivotal in designing, building, and deploying critical AI agents tailored for complex client environments. Your role is highly cross-functional, involving direct collaboration with customers to understand their unique needs, adapting our platform accordingly, and iterating on scalable solutions to handle millions of real-world security events.You will manage projects from inception to deployment, including data onboarding and integrating feedback into our core agent platform. Your contributions will shape how AI agents detect threats, triage incidents, and automate security workflows for some of the most sophisticated organizations worldwide.This position is ideal for engineers who excel in dynamic environments, enjoy tackling complex technical challenges, and wish to see the tangible impact of their work.

About Cogent SecurityCogent Security is an innovative Applied AI Lab pioneering the future of AI agents in the realm of cybersecurity. In a world where cyber threats evolve at unprecedented speeds, our 'AI Taskforce' analyzes vast amounts of enterprise data to proactively address vulnerabilities and avert critical breaches.We remain at the forefront of technology by merging cutting-edge research with practical applications. Our dedicated Cogent Research team fuels our mission, ensuring we develop truly effective security workflows powered by AI.Since our inception, Cogent has rapidly grown, collaborating with Fortune 500 companies to safeguard the most intricate production environments globally.Supported by Greylock, our team comprises some of the brightest minds in applied AI, including experts from:Renowned universities such as Stanford, Berkeley, Penn, Duke, Carnegie Mellon, and Waterloo.High-growth unicorn companies like Scale AI, Databricks, Stripe, Tesla, and Coinbase.Leading cybersecurity specialists from Wiz, Abnormal AI, and Zscaler.Prestigious research institutions including DeepMind and SAIL.About the RoleAs we embark on building a suite of backend services and integrations with our design partners, we seek passionate and skilled Backend Engineers at both Senior and Staff levels, eager to thrive in the Applied AI domain.ResponsibilitiesDesign and implement critical backend subsystems and integration platformsComprehend business objectives and customer requirements to engineer backend subsystems that align with our technology strategies.Adapt systems to meet evolving needs of design partners and clients.Incorporate non-functional requirements such as compliance and security into system design.Establish scalable infrastructure foundationsPrepare for future growth in customer base, headcount, and data management by collaborating with your team to enhance infrastructure.

Join Decagon as a Security Engineer where you will play a crucial role in safeguarding our systems and data. You will collaborate with cross-functional teams to identify vulnerabilities, implement security measures, and ensure compliance with industry standards. This is an exciting opportunity to work in a dynamic environment and contribute to the security posture of our organization.

Juicebox is looking for a Security Engineer based in San Francisco. The main focus is to safeguard digital infrastructure and maintain the security of systems and data. Key responsibilities Develop and apply security measures throughout company systems Support compliance efforts with relevant industry security standards Location This role is based in San Francisco.

About Cogent SecurityCogent Security is at the forefront of innovation in cybersecurity, operating as an Applied AI Lab dedicated to developing next-generation AI agents. In an era where cyber threats evolve rapidly, our "AI Taskforce" analyzes vast amounts of enterprise data to proactively address vulnerabilities and prevent significant breaches.Blending cutting-edge research with practical implementation, our team works diligently to transform theoretical concepts into actionable security solutions. Our applied AI lab, Cogent Research, provides essential research capabilities that enable the realization of autonomous security workflows.Since our emergence from stealth mode, Cogent has seen impressive growth, collaborating with Fortune 500 companies to enhance security in some of the world’s most complex environments.Supported by Greylock, we have assembled a team of top-tier talent from influential universities and leading companies in the tech and cybersecurity sectors.

Join Our Team at MercorAt Mercor, we sit at the cutting edge of labor markets and AI innovation. Collaborating with top AI laboratories and enterprises, we provide the vital human intelligence necessary for the advancement of AI development.Our extensive talent network trains advanced AI models, sharing insights and experiences that transcend mere coding. Daily, over 30,000 experts in our community collectively generate more than $2 million.Mercor is pioneering a new realm of work wherein expertise fuels AI progress. This ambition calls for a dynamic, fast-paced, and dedicated team. You will collaborate with researchers, operational teams, and AI firms at the forefront of redefining our societal systems.As a profitable Series C enterprise valued at $10 billion, we operate in-person five days a week from our newly established headquarters in San Francisco.About the RoleIn your capacity as a Security Engineer at Mercor, you will be entrusted with the crucial task of protecting our systems, infrastructure, and sensitive data. You will design and execute defense mechanisms, monitor for potential threats, and ensure that security is seamlessly integrated throughout the entire development and deployment lifecycle. This position is perfect for an individual who thrives in fast-paced settings, anticipates risks proactively, and enjoys constructing effective, scalable security systems without hindering innovation.Your ResponsibilitiesDesign and implement robust security controls across our infrastructure, applications, and networks.Continuously monitor for vulnerabilities, threats, and any suspicious activities.Conduct penetration tests, vulnerability assessments, and manage incident responses.Integrate security practices into CI/CD pipelines and development workflows.Ensure compliance with standards such as SOC 2, ISO 27001, and GDPR.Collaborate with engineers to ensure security is prioritized in system design.Research emerging threats and implement proactive countermeasures.Ideal CandidateProfound understanding of security principles, tools, and industry best practices.Experience with SIEMs, IDS/IPS, firewalls, and vulnerability scanning.Familiarity with cloud security environments (AWS, GCP, or Azure).Solid foundation in encryption and secure coding practices.

About NudgeAt Nudge, we are dedicated to pioneering innovative technologies that interface with the brain, enhancing lives across the globe. Our primary focus is on developing a revolutionary non-invasive ultrasound-based device that stimulates and images the brain with remarkable precision. This integrated effort encompasses cutting-edge hardware, software, and research capabilities to create products poised to benefit millions — ultimately, billions — of individuals.About the RoleAs an Electrical Engineer at Nudge, your responsibilities will include:Engineering drive systems for high channel-count ultrasound phased arrays.Designing analog receive circuits tailored for groundbreaking imaging applications.Creating embedded systems for compact, wearable high channel-count ultrasound phased arrays.Architecting systems for seamless integration with transducers employing diverse fabrication methods and custom ASICs.Developing reliable, high throughput test systems with precision.Taking ownership of designs from the initial concept through prototyping to deployment in clinical trials.Collaborating closely with mechanical engineers, software engineers, ultrasound engineers, and clinical operators.

Join CodeRabbit as Our Lead Security EngineerAt CodeRabbit, we are at the forefront of innovation in research and development, dedicated to creating groundbreaking human-machine collaboration systems. Our vision is to revolutionize the future of software development through the integration of Gen AI-driven code reviewers, facilitating an unparalleled partnership between human creativity and advanced algorithms. By harnessing the power of language models and human intellect, we aim to redefine efficiency and quality in software development.Position Summary:We are seeking a seasoned Lead Security Engineer to join our mission of empowering developers with high-performance tools in a rapidly evolving threat landscape. In this pivotal role, you will be responsible for architecting, fortifying, and safeguarding our infrastructure and ecosystem.As the Lead Security Engineer, you will infuse security into all aspects of our product and infrastructure, serving as the guardian of resilience, incident response, and proactive defense at scale.Key Responsibilities:Define the Security Roadmap: Develop and implement a strategic security engineering plan that aligns with CodeRabbit’s agile engineering processes.Enhance Resilience: Advocate for defense-in-depth strategies, including threat modeling, secure design reviews, hardening, and CI/CD integration.Lead Incident Response: Take charge of security incident response and recovery, ensuring effective triage, resolution, and root cause analysis to bolster system integrity.Security Tools & Automation: Develop or integrate security tools (SAST, DAST, SIEM, EDR, monitoring) seamlessly into the developer workflow to maintain high delivery velocity.Integrate Security Practices: Collaborate with engineering and product teams to ensure secure practices are incorporated early in project planning and daily operations.Cultivate Talent & Culture: Contribute to hiring, coaching, and mentoring a resilient security engineering team while promoting security awareness throughout the organization.Establish Compliance & Policy: Develop security standards, frameworks, and processes that evolve with our growth while remaining streamlined and developer-friendly.Qualifications:Proven Experience: 8+ years in security engineering, incident response, or related fields. Leadership experience during critical situations is a plus.Technical Proficiency: In-depth knowledge of security best practices, threat modeling, and incident management.Collaborative Mindset: Strong interpersonal skills and the ability to work effectively across multidisciplinary teams.Adaptability: Eagerness to learn and adapt in a dynamic and fast-paced environment.

Role OverviewAt Variance, we are at the forefront of teaching machines to execute high-stakes judgment calls on a large scale. This involves developing AI agents that navigate the complex domains of risk investigations, fraud detection, and identity verifications.Our San Francisco-based team is small yet exceptionally talented, comprising former founders and specialists from leading AI laboratories. We cater to an impressive clientele, including Fortune 500 companies, global marketplaces, and regulated financial institutions. If you are passionate about taking ownership, working swiftly, and collaborating closely with founders, you will thrive in our environment.We are seeking a Security Engineer to help establish a robust security foundation. You will collaborate across product, infrastructure, and internal systems to ensure that Variance is secure by design, enabling us to meet the rigorous standards needed to deploy AI in critical workflows for the world’s largest corporations.