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If you are a talented Applied Scientist with strong technical skills, a passion for turning data and research into real-world impact, and the ambition to design, experiment, and ship innovative ML and AI solutions, we would love to talk to you!

In our team, you will:

Develop ML models to detect and disrupt cyberattacks.

Collaborate with security experts to incorporate domain knowledge into ML solutions.

Work with truly large-scale data to create and refine high-quality training datasets.

Deploy ML models into production, monitor their performance, and continuously improve them.

Stay up to date with the latest advancements in ML/AI and apply them to complex cybersecurity challenges.

Meta Security is looking for a Security Engineer with experience in threat modeling, TTP identification, and detection engineering. Youll work alongside Software Engineers and Offensive Security Engineers to identify critical assets, assess the top risks, and evaluate potential attacks against Meta systems. You will be working across engineering teams to develop detection and response automation leveraging both industry-standard and custom detection and response platforms. Youll generate detection ideas utilizing some of the worlds largest data sets and build on top of hyper-scale data pipelines.
Security Engineer - Surface Coverage, Detection Engineering Responsibilities
Lead cross-functional projects to improve our capabilities to effectively detect and respond to security incidents
Review security architecture of large-scale custom and commercial systems and independently propose logging, detection and prevention controls
Perform TTP-based Threat Modeling for a wide variety of assets including endpoints, mobile, servers, internal services, public & private cloud environments and networking equipment
Perform analysis against logs from a variety of sources (e.g., individual host logs, network traffic logs) to identify potential threats and detection ideas
Build response workflows and actions that auto-resolve false positives and provide context scaling our ability to investigate
Support security incident response in a cross-functional environment and drive incident resolution
Design and implement attack testing automation to validate detection coverage
Build logging pipelines using our custom datasets and infrastructure

We are seeking a Senior Applied Scientist to contribute to the ongoing development of Microsoft 365 Copilot in Excel, with an emphasis on optimizing LLM and Agentic workflows. This position is part of the Microsoft 365 Excel team, dedicated to pioneering advancements in generative AI. The successful candidate will possess substantial expertise in large language models (LLMs), information retrieval, and machine learning. Responsibilities include close collaboration with engineering and product teams to innovate, design, and assess comprehensive AI solutions for millions of enterprise users. This role will influence technical direction, inform product development, and foster cross-team collaboration to deliver impactful AI-driven experiences that empower users to achieve more.



Responsibilities

Youll work as part of an Applied Science team on high-impact, technically ambitious AI projects that directly shape the future of Microsoft 365 Copilot in Excel including

You will design, fine-tune, and deliver models and agentic flows for integration with Excel Agent and on-canvas experiences.
You will leverage state-of-the-art LLM fine-tuning and retrieval methods, with robust evaluation metrics and A/B testing to ensure data-driven progress.
You will gather and curate relevant benchmarks, build a comprehensive evaluation framework, and develop GPT-based evaluators (LLM-as-a-Judge). Run controlled experiments to compare performance, efficiency, and scalability using data-driven metrics and A/B testing focusing on reproducible and impactful results.
You will continuously study emerging literature, share insights with leadership and peers during research reviews and deep dives adapt quickly to new findings, and integrate them into experiments and when applicable share with broader research community.

In this role, you will conduct technical research to analyze and break down identity-based attacks observed across the threat landscape including insights from security research, real-world incidents, customer reports, and emerging trends. Your work will directly guide product and engineering teams in building advanced visibility, high-confidence detections, and durable protections that safeguard Microsoft customers at scale.

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Responsibilities
Analyze and deeply understand the internals of authentication and network protocols, independently reproducing identity-based attacks for investigation, exploration, and research purposes.

Become a subject-matter expert in identity-focused investigation, collection, analysis, and forensics including a deep understanding of emerging trends, evolving attack techniques, and the identity threat landscape.

Collaborate closely with multiple product and engineering teams to design next-generation sensors, implement innovative detection ideas, and validate their effectiveness using a data-driven approach.

Work hand-in-hand with engineering teams to deliver prototypes and production-ready code that support and operationalize research insights.

Provide cybersecurity expertise during security escalations and incidents to help protect Microsoft and our customers.

Meta is seeking talented engineers to join our teams in building cutting-edge products that connect billions of people around the world. As a member of our team, you will have the opportunity to work on complex technical problems, build new features, and improve existing products across various platforms, including mobile devices and web applications. Our teams are constantly pushing the boundaries of user experience, and we're looking for passionate individuals who can help us advance the way people connect globally. If you're interested in joining a world-class team of engineers and researchers to work on exciting projects that have significant impact, we encourage you to apply.
Software Engineer Responsibilities
Collaborate with cross-functional teams (product, design, operations, infrastructure) to build innovative application experiences
Implement custom user interfaces using latest programming techniques and technologies
Analyze and optimize code for quality, efficiency, and performance, and provide feedback to peers during code reviews
Set direction and goals for teams, lead major initiatives, provide technical guidance and mentorship to peers, and help onboard new team members
Architect efficient and scalable systems that drive complex applications
Identify and resolve performance and scalability issues, and drive large efforts to reduce technical debt
Work on a variety of coding languages and technologies
Establish ownership of components, features, or systems with expert end-to-end understanding

In this role, you will work at the forefront of automated attack disruption, developing capabilities that detect and respond to advanced threats in real time, regardless of the attack workflow or stage in the kill chain. You will examine diverse and complex signals across on-premises, hybrid, and cloud environments, hunting for emerging adversary techniques, uncovering novel patterns of malicious behavior, and transforming research findings into practical, scalable protection. Your work will span from the earliest ideation stages to production-ready, customer-facing capabilities: researching and modeling attack techniques, identifying the necessary telemetry, designing robust detection logic, and ensuring that our automated disruption mechanisms can respond effectively in real-world conditions. This is an opportunity to have a direct impact on the security of organizations worldwide by building autonomous defense systems that stay ahead of evolving threats and protect customers at scale. You will collaborate closely with engineers, threat analysts, and product teams, bringing creativity and rigor to the challenge of stopping some of the most advanced attacks in the industry before they can cause harm. Our team values diversity and strives to hire individuals with varied experiences and perspectives. We understand that no candidate possesses every desired skill and experience, but together, we form a strong, effective team.



Responsibilities
Provide cybersecurity expertise as needed during security escalations and incidents to help protect Microsoft and our customers
Proactively hunt across diverse signal sources including on-premises, hybrid, and cloud environments
Stay current with the latest cyberattack trends and design robust, sophisticated detection logic across the full attacker kill-chain.
Build and implement innovative automated disruption capabilities that autonomously detect and mitigate attacks in real time.
Collaborate with engineering and product teams to design security sensors, validate protection ideas, and measure effectiveness using data-driven approaches.
Contribute to the broader security community by authoring technical blogs, sharing research findings, and presenting at leading security conferences.

As a Senior Software Engineer in our Edge AI group, you will design, develop, and maintain media encoding pipelines and live streaming workflows for both cloud and on-premises environments. You will build infrastructure, tools, and real-time monitoring systems that ensure reliable live video delivery and operational visibility. Your work will involve writing code that integrates with Azure resources and extensions, leveraging modern technology stacks and methodologies. You will be expected to break down complex problems, create clear execution plans, and take full ownership of your code from development through production. Collaboration within a multi-disciplinary team will be key, requiring strong communication skills and alignment with Microsoft values. In addition, you will automate quality control and alerting mechanisms to rapidly detect and resolve streaming issues, ensuring a seamless experience for customers streaming camera feeds and viewing live video alongside AI-driven insights.

We are looking for a passionate and experienced Senior System Architect to join our Security team. This is a unique opportunity to lead the design of end-to-end security solutions that span across silicon, firmware, and OS layers. In this role, youll collaborate with diverse teams across the company, driving system-level thinking and delivering secure, scalable solutions. Were looking for someone who combines deep security expertise with strong system engineering instincts and the ability to influence and align across disciplines. If you're excited about redefining endpoint security in an AI-driven world, where new opportunities come with new threats, this is your chance to make a real impact. Microsofts mission is to empower every person and every organization on the planet to achieve more. As employees we come together with a growth mindset, innovate to empower others, and collaborate to realize our shared goals. Each day we build on our values of respect, integrity, and accountability to create a culture of inclusion where everyone can thrive at work and beyond. We are committed to a diverse and inclusive workplace and strongly encourage applicants from all backgrounds and walks of life. Difference makes us better.

Responsibilities
Define and lead the architecture of security features across silicon, firmware, and OS layers

Translate product and customer requirements into clear system-level security specifications

Collaborate with cross-functional teams to design and deliver secure, scalable solutions

Develop system threat models and conduct security reviews to identify and mitigate risks

Drive alignment across engineering teams through clear documentation and technical leadership

Stay current with evolving security technologies, threats, and best practices