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Principal AI Software Engineer

Microsoft
staff
Location

Dublin, Ireland

Work Type

Onsite

Seniority

staff

Posted

December 24, 2025


Total Compensation
€265,000
Yearly Savings (Comfortable)
€88,676
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Job Description

Overview Are you a great Software Engineer? Do you like working on technology problems which impact people on a global scale? Would you like to work on complex problems that help users find and utilize solutions in M365 Copilot? If you're passionate about our users having the best Copilot experience and you like working across both consumers and enterprises for PCs, tablets, and phones then maybe the Microsoft 365 Growth team has the right job for you.

We are looking to hire a Principal AI Software Engineer to join our team. As a member of this team, you will have the opportunity to work on multiple levels of the AI software stack, including the fundamental abstractions, programming models, compilers, runtimes, libraries and APIs to enable large scale training and inferencing of models.

This is an Individual contributor role: as a principal technical leader it requires setting the technical direction for the organisation in the area, and hands on software design and development skills. We’re looking for someone who has a demonstrated history of solving hard technical problems and is motivated to tackle the hardest problems in building a full end-to-end AI stack.  An entrepreneurial approach and ability to take initiative and move fast are essential.

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.

Responsibilities

  • Set technical direction for the team.
  • Apply engineering principles for defining robust and maintainable architectures and designs.
  • Identify requirements, scope solutions, estimate work, schedule deliverables.
  • Collaborate with partner teams to drive holistic solutions across the stack.
  • Technical leadership and mentoring of software engineers.
  • Embody our Culture and Values.

Qualifications Required 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.

  • A technical background and solid foundation in software engineering principles and architecture design.

  • Ability to plan and influence technical designs on projects that will have potential long-term impact to Microsoft.

  • Proven experience in developing and deploying large language models (LLMs): Demonstrated expertise in working with state-of-the-art LLMs, including their training, fine-tuning, and application in various natural language processing tasks.

  • Exposure to Deep Neural Network training and inference and experience in one or more deep learning frameworks (PyTorch, TensorFlow, ONNX, etc.).

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.

Preferred Qualifications

  • Cross-team collaboration skills and the desire to collaborate in a team of researchers and developers.
  • Solid communication skills (both written and oral).

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.

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