Mozilla

Mozilla, the maker of Firefox, is a non-profit organization ensuring an open, safe, and accessible internet for all users worldwide.

Internet Software & Services

Information Technology

251-1K (750)

Founded 2005

$2M raised

41 open positions

Links

View All Jobs

Senior Software Engineer, Firefox Security

3 weeks, 6 days ago

Belgium

Full-time

Senior

Software Engineer

Software Development

C C++ Encryption Rust

Apply Now

Mozilla

Mozilla, the maker of Firefox, is a non-profit organization ensuring an open, safe, and accessible internet for all users worldwide.

Internet Software & Services

251-1K

Founded 2005

$2M raised

View All Jobs 41

Description

Advance Firefox’s security architecture and cryptography stack, including cryptographic protocols, WebPKI, and security-sensitive web APIs.
Design and implement web platform security features in collaboration with teammates and the broader web community.
Develop and ship standards-based, secure, and interoperable implementations across Firefox.
Investigate and resolve issues affecting browser stability, correctness, performance, memory usage, and resource efficiency.
Partner with engineers across teams to identify, prioritize, and address security issues.
Participate in debugging, root cause analysis, and implementation of long-term solutions.
Contribute to technical discussions, design reviews, and project planning for security-related initiatives.
Evaluate tradeoffs and help inform engineering decisions within your area of work.

Requirements

Strong software engineering experience with proficiency in C/C++.
Solid understanding of security principles, including cryptographic protocols and implementations.
Experience contributing to the design, implementation, testing, and maintenance of complex software systems.
Ability to diagnose and resolve issues in multi-threaded, cross-platform native applications.
Strong debugging and problem-solving skills, especially for performance and memory-related challenges.
Ability to work effectively with distributed teams and communicate technical concepts clearly.
Curiosity and willingness to deepen expertise in browser security, cryptography, and systems programming.
Familiarity with web technologies and interest or experience in Rust.
Comfort working within large, complex, multi-language codebases.

Benefits

Generous performance-based bonus plans for eligible employees.
Rich medical, dental, and vision coverage.
Generous retirement contributions with 100% immediate vesting.
Quarterly all-company wellness days.
Country-specific holidays plus a day off for your birthday.
One-time home office stipend.
Annual professional development budget.
Quarterly well-being stipend.
Considerable paid parental leave.
Employee referral bonus program.
Additional benefits such as life insurance, AD&D, disability, and EAP, depending on country.
Remote Belgium hiring range of €56,000 to €74,000 EUR.

Interested in this position?

Apply directly on the company website

Apply Now

Similar Roles

Software Engineer, Test Infrastructure

Skyline Eco-Adventures 11-50 Hotels, Restaurants & Leisure

Zipline is seeking a Senior Software Systems Validation Engineer to lead end-to-end validation of autonomous drone delivery software, from simulation through full-system flight testing, for safe deployment and operating-domain expansion.

United States Full-time Senior Software Engineer

$150k-$250k

C++ Python Rust SQL

1 day, 18 hours ago

Apply

1 day, 18 hours ago

Senior Software Engineer - UI/UX

Dragos 251-1K Professional Services

Dragos is hiring a Software Engineer to build the user-facing experiences that help security professionals detect, investigate, and respond to cyber threats against critical infrastructure.

United States Full-time Senior Frontend Engineer / Web Developer Software Engineer

$165k-$165k

Cybersecurity Design Systems React TypeScript

1 day, 18 hours ago

Apply

1 day, 18 hours ago