Endpoint Security Software Engineer, C++/PC Windows - USDS

Responsibilities

About the team
The Security Engineering team is missioned to run and operate security infrastructures, platforms and technologies, as well as to support cross-functional teams to protect our users, products and infrastructures. This team is responsible for enhancing security tools and identifying vulnerabilities, with a specific focus on content assurance and the application of large language models (LLMs). You'll collaborate cross-functionally with partners inside and outside TikTok to fortify our products and users' security, helping to establish TikTok as the most trusted platform.

Responsibilities
We are seeking a Software Engineer to be a core contributor to our Windows Desktop security suite. In this role, you will be responsible for the architecture of a high-performance AppGuard solution tailored for Windows, utilizing low-level APIs to monitor and secure application traffic. You will apply your expertise in Windows internals to build a robust engine capable of executing complex DSL-based security rules.
- System-Level Development: Design and implement security features using C/C++, .NET, and the Win32 API.
- Traffic & Network Control: Develop deep integration with the Windows network stack to monitor, sample, and cut-off egress/ingress traffic.
- Advanced Debugging: Leverage tools such as WPR, IDA, WinDbg, and x64dbg to troubleshoot complex system behaviors and ensure stability.
- Infrastructure Support: Participate in the development of tools for profiling, testing, and operational monitoring of the PC sandbox.
- Drive Strategic Design: Translate complex business requirements into high-performance technical solutions.

Qualifications

Minimum Qualifications
- BS/MS degree in Computer Science, Engineering, or a related field.
- 3+ years of experience in Windows application development, specifically using Electron, QT, or native frameworks.
- Deep Technical Expertise: Proficiency in C/C++, .NET, Win32 API, and UWP/WinUI.
- System Knowledge: Familiarity with Windows frameworks, networking, and dynamic-link libraries (DLLs).

Preferred Qualifications
- Experience with generative AI tools to assist in the porting and analysis of complex business logic.
- Knowledge of UI/UX design principles for creating intuitive desktop administration tools.
- Strong understanding of DevOps practices for Windows-based software distribution.

Job Information

[For Pay Transparency] Compensation Description (annually)

The base salary range for this position in the selected city is $187040 - $359720 annually.

Compensation may vary outside of this range depending on a number of factors, including a candidate's qualifications, skills, competencies and experience, and location. Base pay is one part of the Total Package that is provided to compensate and recognize employees for their work, and this role may be eligible for additional discretionary bonuses/incentives, and restricted stock units.

Benefits may vary depending on the nature of employment and the country work location. Employees have day one access to medical, dental, and vision insurance, a 401(k) savings plan with company match, paid parental leave, short-term and long-term disability coverage, life insurance, wellbeing benefits, among others. Employees also receive 10 paid holidays per year, 10 paid sick days per year and 17 days of Paid Personal Time (prorated upon hire with increasing accruals by tenure).

The Company reserves the right to modify or change these benefits programs at any time, with or without notice.

For Los Angeles County (unincorporated) Candidates:

Qualified applicants with arrest or conviction records will be considered for employment in accordance with all federal, state, and local laws including the Los Angeles County Fair Chance Ordinance for Employers and the California Fair Chance Act. Our company believes that criminal history may have a direct, adverse and negative relationship on the following job duties, potentially resulting in the withdrawal of the conditional offer of employment:

1. Interacting and occasionally having unsupervised contact with internal/external clients and/or colleagues;

2. Appropriately handling and managing confidential information including proprietary and trade secret information and access to information technology systems; and

3. Exercising sound judgment.