Security represents the most critical priorities for our customers in a world awash in digital threats, regulatory scrutiny, and estate complexity. Microsoft Security aspires to make the world a safer place for all. We want to reshape security and empower every user, customer, and developer with a security cloud that protects them with end to end, simplified solutions. The Microsoft Security organization accelerates Microsoft’s mission and bold ambitions to ensure that our company and industry is securing digital technology platforms, devices, and clouds in our customers’ heterogeneous environments, as well as ensuring the security of our own internal estate. Our culture is centered on embracing a growth mindset, a theme of inspiring excellence, and encouraging teams and leaders to bring their best each day. In doing so, we create life-changing innovations that impact billions of lives around the world.

The Trust and Security Services (TSS) engineering team manages a portfolio of services that form the foundation of Microsoft’s trust model. These services include code signing, anti‑malware scanning, and key licensing infrastructure among others. Our engineering challenges are unique in both scale and complexity. We process billions of files every month and support a broad range of workloads - from low-level drivers to 4K AAA games - while operating under the highest standards of security (physical and logical) and compliance. TSS runs some of the most security‑sensitive services and environments at Microsoft. We are a strongly mission‑driven organization. In today’s world, where supply chain attacks and security threats are increasing in both frequency and sophistication, TSS services are critical to protecting Microsoft, its customers, and its partners. In this role, you will help design, build, and operate critical security services that our customers depend on. You will play a key role in advancing Microsoft’s trust foundation to the next level.

Microsoft’s 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.

#MSFTSecurity, #identity

• Build and operate foundational platform services at scale. Design, build, and run highly available, globally distributed backend services that handle high traffic and millions of requests, forming part of Microsoft’s critical trust and security infrastructure.
• Leverage AI‑assisted development and analysis tools to improve engineering productivity, code quality, testing, and operational effectiveness, while applying strong judgment, security, and reliability standards.
• Collaborate deeply across disciplines to turn ambiguity into durable solutions. Partner with Product, Design, Data, and Engineering teams to translate complex or ambiguous problems into clear designs and robust backend services that power secure, high‑quality experiences.
• Drive operational excellence through data and engineering rigor. Use telemetry and data to understand system behaviour, run experiments, and continuously improve reliability, scalability, and recovery workflows, including reducing operational toil and mean time to recovery (MTTR).

Required/minimum qualifications

• Bachelor's Degree in Computer Science, or related technical discipline with proven experience coding in languages including, but not limited to, C, C++, C#, Java, JavaScript, or Python OR equivalent experience.
• You must be legally authorised to work in Ireland to be eligible for this role. (Legally authorised = has citizenship or has been granted a valid visa or work permit).

Additional or preferred qualifications

• Master's Degree in Computer Science or related technical field with proven experience coding in languages including, but not limited to, C, C++, C#, Java, JavaScript, or Python OR Bachelor's Degree in Computer Science or related technical field AND 2+ years technical engineering experience with coding in languages including, but not limited to, C, C++, C#, Java, JavaScript, or Python OR equivalent experience.

Ability to meet Microsoft, customer and/or government security screening requirements are required for this role. These requirements include, but are not limited to the following specialized security screenings: Microsoft Cloud Background Check: This position will be required to pass the Microsoft background and Microsoft Cloud background check upon hire/transfer and every two years thereafter.

This position will be open for a minimum of 5 days, with applications accepted on an ongoing basis until the position is filled.

Microsoft is an equal opportunity employer. All qualified applicants will receive consideration for employment without regard to age, ancestry, citizenship, color, family or medical care leave, gender identity or expression, genetic information, immigration status, marital status, medical condition, national origin, physical or mental disability, political affiliation, protected veteran or military status, race, ethnicity, religion, sex (including pregnancy), sexual orientation, or any other characteristic protected by applicable local laws, regulations and ordinances. If you need assistance with religious accommodations and/or a reasonable accommodation due to a disability during the application process, read more about requesting accommodations.