Senior Software Engineer

Job Description

Overview

The OneFuzz team is part of Microsoft’s Security Fundamentals R&D organization, focused on advancing automated security testing through fuzzing. Our mission is to empower developers to identify and remediate vulnerabilities early by providing a scalable, integrated fuzzing platform.
Key priorities include:

• Fuzzing Infrastructure Development: Maintain and evolve OneFuzz, an open-source, cloud-based fuzzing service for continuous security testing.

• Workflow Integration: Embed fuzzing into CI/CD pipelines to reduce friction and improve security posture.

• Security Research & Innovation: Explore new fuzzing techniques (coverage-guided, grammar-based) and integrate them into OneFuzz.

• Reliability & Operational Excellence: Ensure high availability, robust monitoring, and incident response for the service.

Responsibilities

Drive development of Microsoft’s cloud-based fuzzing platform to enable scalable, integrated security testing. Responsibilities include:

• Designing and implementing core fuzzing infrastructure for performance and reliability
• Building CI/CD integrations to streamline developer workflows
• Advancing fuzzing techniques through research and production-ready features
• Ensuring service reliability with robust monitoring and incident response
• Collaborating across teams and contributing to the open-source community

Qualifications

Required Qualifications>

• Strong programming skills in languages like Python, C#, or Rust.

• Experience with distributed systems or cloud services (Azure preferred).

• Solid understanding of software engineering fundamentals and secure coding practices.

• Ability to work in collaborative environments and deliver high-quality code.

Preferred Qualifications

• Familiarity with fuzzing technologies, vulnerability research, or security testing.

• Experience with CI/CD pipelines and DevOps practices.

• Knowledge of containerization (Docker/Kubernetes) and scalable service design.

• Contributions to open-source projects or community engagement in security tooling.

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.