Senior Windows Internals Developer - UK

About Transmit Security

Transmit Security is a recognized leader in identity and security, revolutionizing authentication and fraud prevention with cutting-edge technology.

As we gear up for an exciting year, we are looking for exceptional engineers to tackle large-scale, complex challenges in security and authentication.

The FlexId Group is at the heart of our mission, responsible for building the infrastructure and features that power our core identity platform.

his is an opportunity to work on high-impact, large-scale distributed systems that shape the future of identity security.

About the Role:

We are looking for an experienced C++ Software Engineer to develop high-performance client-side applications that integrate deeply with Windows OS.

This role is ideal for someone who is passionate about system-level programming, security, and optimization.

As a key member of the FlexId team, you will be involved in designing and implementing critical features, ensuring seamless Windows integration, and addressing complex security challenges.

What You’ll Do:

• Develop and optimize Windows-based client applications using modern C++.
• Work closely with Windows OS components, including Windows Registry, COM API, Windows Events, and system services.
• Design and implement security-related features, integrating cryptographic protocols and authentication mechanisms.
• Debug, profile, and optimize performance to ensure reliability and efficiency.
• Collaborate with backend teams, security experts, and product managers to deliver secure, scalable solutions.
• Stay ahead of industry trends in security, Windows development, and authentication technologies.

What you’ll need:

• 5+ years of hands-on experience in C++ software development for client-side applications.
• Strong understanding of Windows internals, including services, registry, COM API, and event handling.
• Experience with performance optimization, debugging, and multi-threaded development.
• Knowledge of security protocols and cryptographic principles (RSA, SHA, Certificate Authority, Kerberos) is a plus.
• A self-starter with a “get things done” attitude and a problem-solving mindset.

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