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Principal Software Engineer

Microsoft

Microsoft

Software Engineering
Posted on Jul 4, 2025

Principal Software Engineer

Multiple Locations, Ireland

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Date posted
Jul 04, 2025
Job number
1838238
Work site
Up to 100% work from home
Travel
0-25 %
Role type
Individual Contributor
Profession
Software Engineering
Discipline
Software Engineering
Employment type
Full-Time

Overview

The Azure Networking team continues to innovate across the entire technology stack, introducing new levels of scalability and features into both cloud and desktop platforms. At the same time, the team is transforming our infrastructure to meet the growing demands of more than 200 Microsoft online services. These include Bing, Microsoft Start (formerly MSN), Microsoft 365 (formerly Office 365), Xbox Live, Skype, OneDrive, and hundreds of thousands of customers who use Microsoft Azure to host and operate their cloud-based services. These services are supported by over 100 data centers and millions of servers and edge computing nodes distributed globally.

Our teams are responsible for a wide range of networking solutions, including Networking hardware and optical and Internet Protocol (IP) networks that span subsea, terrestrial, and metropolitan fiber. Hybrid services that enable connectivity between customers' on-premises networks and the cloud using Virtual Private Network (VPN) and Multiprotocol Label Switching (MPLS). Edge services that optimize peering and routing. Software Defined Networking (SDN) products that allow customers to extend their on-premises services into the cloud using Virtual Networks (VNet), Load Balancers, Network Security Groups and Services, Application Gateways, and Virtual Appliances to replicate on-premises architectures. Domain Name System (DNS) services to facilitate service discovery and traffic management.

Software Defined Networking (SDN) empowers customers to design and control the network environment best suited for their workloads in the cloud. This includes traditional enterprise network functions such as Access Control Lists (ACLs), firewalls, load balancers, Intrusion Prevention Systems/Intrusion Detection Systems (IPS/IDS), and Denial of Service (DoS) protection. These capabilities are essential for customers who want to implement robust network security and performance for their virtual machines (VMs) in the cloud.

All of these services are delivered over a shared, high-speed, low-complexity physical network built on merchant silicon. The software layer enables the creation of a virtual network on top of this physical infrastructure, using virtualized hosts as the scale-out engine for policy enforcement. This approach allows the physical network to remain cost-effective and extremely fast. The result is a new, software-controlled, virtualized network optimized for the cloud—representing a once-in-a-decade technological transformation. The entire industry is embracing the vision of Software Defined Networking and actively investing in it. This is an exciting opportunity to be at the forefront of two major technological disruptions: cloud computing and Software Defined Networking. Join the core Microsoft Azure team responsible for developing highly available, robust, and scalable load balancing technologies in the cloud. This service is used by millions of customers daily and requires continuous innovation to enhance feature offerings, agility, reliability, performance, scalability, and cost efficiency.

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.

Qualifications

Required/Minimum Qualifications:

  • Bachelor's Degree in Computer Science or related technical field AND technical engineering experience with coding in languages including, but not limited to, C, C++, C#, Java, JavaScript, or Python
    • OR equivalent experience.
  • Experience in software development
  • Experience shipping products or services
  • Passion and drive for profound impact

Other Requirements:

  • 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 Cloud Background Check upon hire/transfer and every two years thereafter.

Additional or Preferred Qualifications:

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

#azurecorejobs

Responsibilities

  • Design and implement features for improving performance and scalability of PubSub systems, drive cross team projects to onboard goal state delivery scenarios to PubSub.
  • Partners with appropriate stakeholders to determine user requirements for a set of scenarios.
  • Leads identification of dependencies and the development of design documents for a product, application, service, or platform.
  • Leads by example and mentors others to produce extensible and maintainable code used across products.
  • Leverages subject-matter expertise of cross-product features with appropriate stakeholders (e.g., project managers) to drive multiple group's project plans, release plans, and work items.
  • Holds accountability as a Designated Responsible Individual (DRI), mentoring engineers across products/solutions, working on-call to monitor system/product/service for degradation, downtime, or interruptions.
  • Proactively seeks new knowledge and adapts to new trends, technical solutions, and patterns that will improve the availability, reliability, efficiency, observability, and performance of products while also driving consistency in monitoring and operations at scale and shares knowledge with other engineers.

Benefits/perks listed below may vary depending on the nature of your employment with Microsoft and the country where you work.
Industry leading healthcare
Educational resources
Discounts on products and services
Savings and investments
Maternity and paternity leave
Generous time away
Giving programs
Opportunities to network and connect

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 and/or a reasonable accommodation due to a disability during the application process, read more about requesting accommodations.