Fidelis Cybersecurity, Inc. is hiring a Software Engineer III to build and maintain secure communication components for mission-critical systems. In this role, you will focus on SSH, TLS/SSL, and related cryptographic services on enterprise platforms, developing system-level software used by global financial institutions and Fortune 500 companies to secure their mission-critical environments.

What You'll Do

Design, develop, test, and troubleshoot software across different hardware, database, and programming technologies.
Write clean, maintainable code based on functional and technical specifications.
Analyze and improve software performance.
Create and maintain technical documentation.
Collaborate in a multiple developer environment.

What We're Looking For

5+ years of C/C++ programming experience delivering software solutions, including system-level development (networking, sockets, secure communication components such as SSH and TLS/SSL).
Experience with developing integrations with terminal emulators in VT100/VT102/6530 and other formats.
3–5 years of experience working with relational databases and writing SQL scripts.
Hands-on experience with software design patterns and principles.
Strong familiarity with Agile and DevSecOps practices.
Experience developing system-level, shippable software, ideally including secure connection handling, certificate management, cryptographic libraries (e.g., OpenSSL), and key exchange workflows.
Expertise building software for nix-based operating systems, including POSIX APIs, daemon/service development, and TCP/IP networking internals.
Expertise with *nix-based scripting languages.
Able to manage multiple activities/projects in a fast-paced environment.
Experienced using Git-based source control.
Experience building unit tests and meeting code quality standards.
Strong understanding of secure development practices, including handling of keys/certificates, memory safety, and protocol-driven security controls.
Familiarity with modern IDEs and toolchains for configuration, build, and development.
Understanding of REST APIs, Web Services, TCP/IP, and JSON, including fundamentals of secure network handshakes (TLS/SSL).

Nice to Have

Experience with mission-critical or fault-tolerant platforms is a strong plus (HPE Nonstop experience ideal but not required).
Knowledge of the HPE Nonstop operating system and environment is a strong differentiating factor.