Senior Software Engineer - C/C++, Concurrency & Performance

Jobtailor; Illinois; On-site; USD 120,000 - 180,000; Full time

Job summary

Jobtailor in Illinois seeks a senior C/C++ software engineer to analyze requirements for new features, enhancements, and bugs; produce clear requirements and design docs; implement changes mainly in the core C layer with occasional JNI and .NET/C# wrappers for cross‑platform support.

You will write development tests, debug, optimize system‑level performance, and collaborate with QA and customer support; occasional direct customer contact for technically complex issues.

Qualifications

• 5+ years writing production-quality C or C++ code.
• Hands-on with multi-threaded programming and concurrency patterns.
• Strong debugging and system-level performance optimization.
• Excellent written communication skills.

Responsibilities

• Analyze requirements for new features, enhancements, and bug fixes; produce clear requirements documents.
• Evaluate the existing codebase to determine optimal design approaches; produce design documents.
• Implement changes primarily in the core C layer, with JNI and .NET wrappers for cross-platform support.
• Write and execute development-level tests to validate correctness and performance.
• Collaborate with QA and customer support engineers throughout the development lifecycle.
• Occasionally engage directly with customers on technically complex issues when escalation is warranted.

Skills

C/C++ development

Multithreaded programming

Concurrency patterns

Thread synchronization

Performance optimization

Debugging

Written communication

Tools

JNI

.NET/C# wrappers

Job description

Jobtailor in Illinois seeks a senior C/C++ software engineer to analyze requirements for new features, enhancements, and bugs; produce clear requirements and design docs; implement changes mainly in the core C layer with occasional JNI and .NET/C# wrappers for cross‑platform support.

You will write development tests, debug, optimize system‑level performance, and collaborate with QA and customer support; occasional direct customer contact for technically complex issues.