Tenzai

Description About Tenzai Tenzai is building autonomous AI hackers that think like the world's best offensive security experts, act like them, and then help fix what they find before the real ones do. If this mission speaks to you, come defend the world's software: autonomously, continuously, and in-depth. About the role This is a rare opportunity to work at the intersection of offensive security and AI — and to have your expertise shape a platform used at enterprise scale. Your work will be deployed and used to hack into applications and systems in the real world. Responsibilites • Design and implement reinforcement learning workflows to train state- of- the- art LLMs specializing in cybersecurity. Design tasks, datasets, and benchmarks for training and evaluating LLMs and agents. • Work on experimentation and evaluation systems — evals are key to everything we do. In this role, you will build evaluation pipelines, design and build experiments, and construct simulations. Requirements • Strong understanding of modern LLMs, including training, post-training, RL, fine-tuning, and inference, with hands-on experience deploying LLM-based systems in production. • Hands-on experience building an agent, including working with complex loops, context engineering, and long-execution tooling. • 5+ years of hands-on programming experience in Python or other backend languages. Strong fundamentals in system design, performance, and debugging. • Experience with data systems and data modeling (databases, pipelines, etc.). • Real-world experience running experiments, measuring outcomes, and iterating. Bonus points • Advanced degree or research experience. • Good understanding of modern, AI-driven software development. Why Tenzai • Working on problems that matter - Software is now written and deployed faster than it can be secured. Attackers are beginning to use AI to find vulnerabilities at scale. Tenzai exists to close that gap. It's a mission that requires elite hackers, and also sharp storytellers, wicked-smart operators, and experienced market builders. • Building a category in the making - Tenzai is defining a new category in cybersecurity. That means every team — from research and engineering to product, brand, and go-to-market — has a chance to shape how the industry understands and adopts autonomous security. If you thrive building something from zero and helping a new idea take hold in the world, keep reading. • Talent density - We believe small teams of exceptional people outperform large organizations. Tenzai was founded by veteran security experts and repeat entrepreneurs. We hire deliberately and value curiosity, initiative, and craftsmanship, whatever your discipline. • Creating real impact, quickly - Whether you're building systems, shaping product experiences, telling the story, or helping customers succeed, your work will immediately influence how organizations secure their software. We move quickly, keep teams lean, and give humans ownership. • Ambition with humility - We're tackling hard problems with a team that values deep expertise and thoughtful collaboration. Everyone here is learning, experimenting, and pushing the boundaries of what's possible. Plus, we love eating lunch together.

Description About Tenzai Tenzai is building autonomous AI hackers that think like the world's best offensive security experts, act like them, and then help fix what they find before the real ones do. If this mission speaks to you, come defend the world's software: autonomously, continuously, and in-depth. About the role This is a rare opportunity to work at the intersection of vulnerability research and AI. You will perform vulnerability and general cybersecurity research, experimenting and pushing the boundaries of what AI can and cannot reliably do in this space.You'll be working with other researchers on individual and group projects around research and prototyping AI agents, building evaluations and finding bugs. Responsibilites • Vulnerability research on public and private targets, building harnesses to automate work, and writing up the results • Building evaluations and challenge benchmarks to find boundaries of what specific AI agents and models can and cannot do • Analyze where Tenzai’s AI agent needs to improve, investigate cases where the AI missed, misclassified, or hallucinated vulnerabilities • Develop new attack strategies and offensive testing techniques for web and network targets, and translate real-world knowledge into prototypes of new AI agents Requirements • Deep expertise in Web security, particularly authentication, business logic, and injection flaws OR deep expertise in network security • 3+ years of experience In vulnerability research or any security research in these fields • Ability to articulate complex vulnerabilities clearly, both in writing and verbally • Experience in writing code to develop tooling • Strong preference for someone with background in static or dynamic analysis, protocol design or other adjacent fields • Comfortable working in a fast-paced startup environment with a high degree of ownership Why Tenzai • Working on problems that matter - Software is now written and deployed faster than it can be secured. Attackers are beginning to use AI to find vulnerabilities at scale. Tenzai exists to close that gap. It's a mission that requires elite hackers, and also sharp storytellers, wicked-smart operators, and experienced market builders. • Building a category in the making - Tenzai is defining a new category in cybersecurity. That means every team — from research and engineering to product, brand, and go-to-market — has a chance to shape how the industry understands and adopts autonomous security. If you thrive building something from zero and helping a new idea take hold in the world, keep reading. • Talent density - We believe small teams of exceptional people outperform large organizations. Tenzai was founded by veteran security experts and repeat entrepreneurs. We hire deliberately and value curiosity, initiative, and craftsmanship, whatever your discipline. • Creating real impact, quickly - Whether you're building systems, shaping product experiences, telling the story, or helping customers succeed, your work will immediately influence how organizations secure their software. We move quickly, keep teams lean, and give humans ownership. • Ambition with humility - We're tackling hard problems with a team that values deep expertise and thoughtful collaboration. Everyone here is learning, experimenting, and pushing the boundaries of what's possible. Plus, we love eating lunch together.

Description About Tenzai Tenzai is building autonomous AI hackers that think like the world's best offensive security experts, act like them, and then help fix what they find before the real ones do. If this mission speaks to you, come defend the world's software: autonomously, continuously, and in-depth. About the role We’re looking for a Senior Software Engineer to join our R&D team and take a key role in building the core platform behind Tenzai’s autonomous security agents. This is a highly technical, hands-on role combining backend engineering, platform architecture, cloud infrastructure, and production ownership. You’ll work on complex engineering challenges around agent execution, secure access to customer environments, multi-region deployments, data isolation, and the infrastructure that enables our agents to operate safely and at scale. We’re looking for a strong, independent engineer who enjoys solving deep technical problems and owning solutions end-to-end. Responsibilites • Design Design and build core backend and platform capabilities that power our autonomous security agents • Build production-grade services in Python and Rust, with a growing focus on Rust • Own complex features end-to-end — from architecture and backend implementation to infrastructure and production • Build secure mechanisms for agents to access customer environments, credentials, and sensitive information while maintaining strict isolation and preventing data exposure • Design systems that separate agent execution from the core platform and enable agents to operate securely and independently • Build and scale multi-region cloud infrastructure, supporting data residency and regional deployment requirements • Design networking and execution infrastructure that allows customers to control where and how security testing is performed • Build internal tools and capabilities that agents can securely use as part of autonomous security workflows • Work closely with Security Research, AI/ML Research, Product, DevOps, and other engineering teams • Take ownership of reliability, scalability, observability, and production performance Requirements • 7+ years of software engineering experience, with a strong focus on backend or platform development • Strong experience building complex, production-grade backend systems • Experience with Python, Rust, Go, C++, or another systems/backend language; willingness to work primarily with Rust over time • Strong understanding of distributed systems, microservices, APIs, databases, and cloud architectures • Hands-on experience with cloud environments such as AWS and modern containerized infrastructure • Experience owning systems in production, including reliability, monitoring, debugging, and performance • Ability to work across different engineering layers when needed — backend, infrastructure, and occasionally UI • Strong system design and problem-solving skills • Highly independent, hands-on, and comfortable taking ownership of ambiguous and complex problems • Comfortable working in a fast-paced startup environment Advantages • Experience building platform, control plane, management, or orchestration systems • Experience with Kubernetes, cluster management, storage systems, or large-scale distributed infrastructure • Experience with multi-region architectures, data residency, networking, or infrastructure isolation • Experience with SRE, DevOps, or production infrastructure • Experience in cybersecurity, AppSec, identity, or security infrastructure • Experience building infrastructure for AI agents, automation platforms, or other autonomous systems • Experience with Rust in production Why Tenzai • Working on problems that matter - Software is now written and deployed faster than it can be secured. Attackers are beginning to use AI to find vulnerabilities at scale. Tenzai exists to close that gap. It's a mission that requires elite hackers, and also sharp storytellers, wicked-smart operators, and experienced market builders. • Building a category in the making - Tenzai is defining a new category in cybersecurity. That means every team — from research and engineering to product, brand, and go-to-market — has a chance to shape how the industry understands and adopts autonomous security. If you thrive building something from zero and helping a new idea take hold in the world, keep reading. • Talent density - We believe small teams of exceptional people outperform large organizations. Tenzai was founded by veteran security experts and repeat entrepreneurs. We hire deliberately and value curiosity, initiative, and craftsmanship, whatever your discipline. • Creating real impact, quickly - Whether you're building systems, shaping product experiences, telling the story, or helping customers succeed, your work will immediately influence how organizations secure their software. We move quickly, keep teams lean, and give humans ownership. • Ambition with humility - We're tackling hard problems with a team that values deep expertise and thoughtful collaboration. Everyone here is learning, experimenting, and pushing the boundaries of what's possible. Plus, we love eating lunch together.

Description About Tenzai Tenzai is building autonomous AI hackers that think like the world's best offensive security experts, act like them, and then help fix what they find before the real ones do. If this mission speaks to you, come defend the world's software: autonomously, continuously, and in-depth. About the role We’re looking for a Technical Support Engineer to support customers through technical POCs, onboarding, and ongoing use of our autonomous security platform. Based in Israel and working closely with R&D and DevOps, you’ll provide real-time support to North American customers. This is a hands-on role for a cybersecurity technical expert comfortable troubleshooting and resolving issues directly with customer teams. Responsibilites • Serve as the primary technical point of contact during customer POCs — supporting deployment, configuration, and troubleshooting so prospects see value fast. • Own technical onboarding for new clients, guiding them through setup, integrations, and initial configuration of the platform. • Provide ongoing technical support to live customers, diagnosing and resolving issues across the product and its integrations. • Run live technical calls with customers over Zoom, Meet, or Teams, and support them asynchronously via email, Slack, and our ticketing system. • Triage, reproduce, and document bugs and feature requests, and escalate to R&D and DevOps with the technical context they need to act quickly. • Work closely with Israel-based R&D and DevOps teams as the connective layer between customer environments and the engineering roadmap. • Build and maintain internal and customer-facing documentation, runbooks, and troubleshooting guides. • Track support activity and flag trends or recurring issues that point to product or process improvements. • Contribute to the development of our global support framework and team, while establishing operational procedures and evaluating technical tooling. Requirements • 3-5 years of experience in technical support, customer support engineering, or a similar customer-facing role supporting cybersecurity products (e.g., AppSec, EDR, SIEM, vulnerability management, or pentest tooling). • Hands-on technical depth: comfortable with networking fundamentals, Linux, cloud environments (AWS/GCP/Azure), reading logs, and working with APIs and integrations; scripting ability (Python or Bash) is a strong plus. • Solid grounding in application security concepts and vulnerability triage — able to understand a finding well enough to explain it, not just route it. • Pen test background — is a strong plus. • Strong written and verbal English communication skills; confident running live technical calls with customer engineering and security teams. • Based in Israel and available to work shifted hours (afternoon into evening, Israel time) to provide real-time overlap with North American customers. • Comfortable working in a fast-paced startup environment with a high degree of ownership and ambiguity. Why Tenzai • Working on problems that matter - Software is now written and deployed faster than it can be secured. Attackers are beginning to use AI to find vulnerabilities at scale. Tenzai exists to close that gap. It's a mission that requires elite hackers, and also sharp storytellers, wicked-smart operators, and experienced market builders. • Building a category in the making - Tenzai is defining a new category in cybersecurity. That means every team — from research and engineering to product, brand, and go-to-market — has a chance to shape how the industry understands and adopts autonomous security. If you thrive building something from zero and helping a new idea take hold in the world, keep reading. • Talent density - We believe small teams of exceptional people outperform large organizations. Tenzai was founded by veteran security experts and repeat entrepreneurs. We hire deliberately and value curiosity, initiative, and craftsmanship, whatever your discipline. • Creating real impact, quickly - Whether you're building systems, shaping product experiences, telling the story, or helping customers succeed, your work will immediately influence how organizations secure their software. We move quickly, keep teams lean, and give humans ownership. • Ambition with humility - We're tackling hard problems with a team that values deep expertise and thoughtful collaboration. Everyone here is learning, experimenting, and pushing the boundaries of what's possible. Plus, we love eating lunch together.

Description About Tenzai Tenzai is building autonomous AI hackers that think like the world's best offensive security experts, act like them, and then help fix what they find before the real ones do. If this mission speaks to you, come defend the world's software: autonomously, continuously, and in-depth. About the Role This is a rare opportunity to work at the intersection of offensive security and AI - and to have your expertise directly shape how a first-of-its-kind platform reaches the enterprise market. This role sits at the forefront of our go-to-market motion. You will be responsible for identifying, engaging and qualifying senior security decision-makers across the UK and Nordic markets, working in close collaboration with the Director of Sales Development, the CRO and the founding team to build a repeatable and scalable outbound pipeline from the ground up. We are looking for driven, commercially minded professionals with native-level British English, a proven track record in outbound sales development and the disposition to thrive in a high-growth, pre-revenue environment. This is an opportunity to contribute meaningfully to the architecture of a sales function - not to execute within one that already exists. For candidates looking to accelerate their career in cybersecurity sales, Tenzai offers a genuinely rare platform - early access to a high-calibre leadership team, direct exposure to enterprise-level deals and the kind of professional development that only comes from building something significant from the ground up. Responsibilites • Own outbound prospecting into the UK and Nordic markets- identifying, researching and engaging security leaders at target accounts. • Managing Inbound lead flow and convert them into pipeline for sales team. • Meeting or exceeding SDR sourced Sales Accepted Opportunities (SAO) volume targets. • Collaborating with teammates to develop targeted lists, call strategies, and messaging; developing opportunities using predictive tools. • Utilizing industry knowledge to research accounts, identify key players, generate interest, create compelling events, and develop accounts. • Working to have a variety of touches (call, email, social, etc…) on leads in your territory to ensure KPI attainment. • Managing, tracking, reporting on all activities and results. • Attending and supporting in-person events, to drive on booth conversations and build strategic pipelines. Requirements • Have 4+ years experience of selling within the sales cycle. • Native- level British English - Written and spoken • 2+ years of experience selling into the UK and Nordic cybersecurity market. • Located in the Tel Aviv or London area • Experienced in identifying business needs through information-gathering to pre-qualify opportunities. • Be comfortable speaking with decision makers via various mediums (social, email, phone and video) • Have positive and engaging phone skills, excellent listening and writing skills. • Have tech industry experience or experience in sales development, marketing or sales. • Have strong outbound prospecting experience. • Startup Mindset: Comfortable working in a fast-paced environment with a high degree of ownership and curiosity. • Experience using tools like Outreach, Clay, Apollo, Salesloft or LinkedIn Sales Navigator- An advantage • You've worked at a pre-revenue or early-stage startup before and know what that pace feels like- An advantage Why Tenzai • Working on problems that matter - Software is now written and deployed faster than it can be secured. Attackers are beginning to use AI to find vulnerabilities at scale. Tenzai exists to close that gap. It's a mission that requires elite hackers, and also sharp storytellers, wicked-smart operators, and experienced market builders. • Building a category in the making- Tenzai is defining a new category in cybersecurity. That means every team — from research and engineering to product, brand, and go-to-market — has a chance to shape how the industry understands and adopts autonomous security. If you thrive building something from zero and helping a new idea take hold in the world, keep reading. • Talent density - We believe small teams of exceptional people outperform large organizations. Tenzai was founded by veteran security experts and repeat entrepreneurs. We hire deliberately and value curiosity, initiative, and craftsmanship, whatever your discipline. • Creating real impact, quickly - Whether you're building systems, shaping product experiences, telling the story, or helping customers succeed, your work will immediately influence how organizations secure their software. We move quickly, keep teams lean, and give humans ownership. • Ambition with humility - We're tackling hard problems with a team that values deep expertise and thoughtful collaboration. Everyone here is learning, experimenting, and pushing the boundaries of what's possible. Plus, we love eating lunch together.