OneMain Financial Jobs

Job#: 3017686

Job Description:

Software Design Engineer 3

Start Date: 01/20/2026

End Date: 06/30/2026

Duration: Approx. 5 months

Chance for Extension: Yes

Location: Onsite -- Redmond, WA

Openings: 1

Pay Rate Range: $60--$65/hr

Top 3 Must-Have Skills

• C/C++ development: 5+ years
• Operating systems knowledge (Windows): 3+ years
• Networking protocols (IPSec, VPN technologies, QUIC): 2+ years

Role Overview

The Software Design Engineer will design, develop, implement, test, and maintain business and computer applications software or specialized utility programs, including client/server applications, as well as major enhancements to existing systems.

Typical Responsibilities

• Troubleshoot, triage, and resolve failures in test pipelines across multiple projects.
• Modify and enhance test automation for network protocols and network security.
• Perform periodic manual tests for VPN, IPSec connection security tunnels, and Linux subsystems.

Ideal Background

• Strong experience in C/C++ systems-level development.
• Familiarity with networking protocols such as IPSec, TCP, and QUIC.
• Comfortable with VPN technologies and software-defined networking.
• Expertise in PowerShell and YAML scripting.
• Experience working in both Windows and Linux environments.
• Skilled in debugging tools such as Wireshark, gdb, tcpdump, and system-level instrumentation.

Key Projects

• Fine-tune and improve complex software implementation projects.
• Gather and analyze system requirements, document specifications, and develop solutions.
• Customize system software to meet client requirements.
• Prepare detailed design and test documentation.
• Implement new or modify existing programs and author automated tests.
• Perform post-implementation validation and resolve bugs.

Candidate Requirements

Preferred Strengths:

• Ability to write clean, maintainable systems-level code in C/C++.
• Strong debugging skills for legacy software using instrumentation and tracing tools.
• Experience analyzing WPP/ETW traces for complex system issues.
• Skilled in developing and enhancing automated test suites.
• Familiarity with VPN, IPSec-based security, and SDN technologies.

Qualifications

• Bachelor's degree in Computer Science, Computer Engineering, or related field.
• 5+ years of experience in software design and development.
• Strong foundation in data structures, algorithms, and software design principles.
• Experience with large-scale systems software development.
• Proficiency in troubleshooting and unit testing for both new and legacy systems.
• Sufficient proficiency in reading and writing code.

Required Technical Skills

• Systems-level programming in C and C++.
• Operating systems knowledge (Windows and Linux).
• Debugging tools: Windows Debugger, Wireshark, gdb, tcpdump.
• Experience with WPP/ETW trace analysis.
• Networking protocols: IPSec, TCP, QUIC.
• VPN and SDN technologies.

• PowerShell and YAML scripting.

   

   

EEO Employer

Apex Systems is an equal opportunity employer. We do not discriminate or allow discrimination on the basis of race, color, religion, creed, sex (including pregnancy, childbirth, breastfeeding, or related medical conditions), age, sexual orientation, gender identity, national origin, ancestry, citizenship, genetic information, regis