Principal Software Engineer

Job#: 3039935

Job Description:

Job Title: Principal Software Engineer

Location: Remote (EST hours)

Pay Range: $74-$83

Length: 6 months

We're hiring a Principal Software Engineer to operate at the intersection of software engineering, production systems, and embedded payments-a hands-on technical leader who thrives in complex, high-scale environments and wants to directly influence how production systems behave.

This is not a traditional support role. You'll be embedded with our operations function as an engineer, partnering across product, SRE, and platform teams to diagnose complex issues, improve system reliability, and turn production learnings into durable platform improvements.

If you're someone who enjoys debugging distributed systems, understanding transaction lifecycles, and making systems fundamentally more reliable over time, this is a high-impact role.

ESSENTIAL DUTIES AND RESPONSIBILITIES

What you'll Do

You will focus on improving system reliability by diagnosing complex production issues and driving systemic fixes across the platform:

• Lead complex production triage and incident response across APIs, payment flows, distributed services, infrastructure, and data layers
• Debug real-world issues involving transaction lifecycles, integrations, and system dependencies
• Partner with engineering to turn incidents into permanent fixes, not recurring problems
• Improve platform reliability through code changes, automation, observability, and better system design
• Build and enhance:
  • Monitoring and alerting strategies
  • Runbooks and diagnostic workflows
  • Operational tooling and automation
• Work across a mixed stack including Ruby (Rails), Java, AWS, APIs, and data systems
• Help teams design systems that are observable, debuggable, and resilient from day one
• Mentor engineers and influence best practices across engineering, SRE, and operations

MINIMUM KNOWLEDGE, SKILLS, AND ABILITIES REQUIRED

• 8+ years in software engineering, SRE, production engineering, or building and operating distributed systems
• Strong experience debugging production issues end-to-end (code infra data dependencies)
• Experience with:
  • Ruby (Rails) and/or Java services
  • AWS and cloud-native environments
  • APIs, microservices, and distributed systems troubleshooting
  • SQL and data-level investigation
  • Hands-on experience with observability tools (Splunk, Datadog, New Relic, etc.)
• Deep understanding of:
  • System behavior in production
  • Fault isolation
  • Performance and resiliency patterns
• Ability to operate calmly and effectively during incidents and escalations
• Strong communication skills-comfortable explaining complex issues to technical and non-technical stakeholders
• Experience in payments, fintech, or regulated environments is strongly preferred
• Bachelor's degree in Computer Science, Engineering, or equivalent experience

WHY JOIN NEWLINE?

• Help operate and scale a modern embedded finance platform backed by a top U.S. bank
• Work at the intersection of fintech innovation, real-time payments, operational excellence, and enterprise-grade reliability
• Solve complex technical problems across payment flows, application services, infrastructure, observability, and client-impacting operations
• Be part of a culture focused on ownership, learning, automation, and continuous improvement

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, registered domestic partner status, marital status, disability, status as a crime victim, protected veteran status, political affiliation, union membership, or any other characteristic protected by law. Apex will consider qualified applicants with criminal histories in a manner consistent with the requirements of applicable law. If you have visited our website in search of information on employment opportunities or to apply for a position, and you require an accommodation in using our website for a search or application, please contact our Employee Services Department at or .

Everforth Apex is a world-class IT services company that serves thousands of clients across the globe. When you join Everforth Apex, you become part of a team that values innovation, collaboration, and continuous learning. We offer quality career resources, training, certifications, development opportunities, and a comprehensive benefits package. Our commitment to excellence is reflected in many awards, including ClearlyRateds Best of Staffing in Talent Satisfaction in the United States and Great Place to Work in the United Kingdom and Mexico.

Everforth Apex uses a virtual recruiter as part of the application process. Click for more details. By applying for this job, you agree to receive calls, AI-generated calls, text messages, or emails from Everforth Apex and its affiliates, and contracted partners. Frequency varies for text messages. Message and data rates may apply. Carriers are not liable for delayed or undelivered messages. You can reply STOP to cancel and HELP for help. You can access our privacy policy at

Everforth Apex Benefits Overview: Everforth Apex offers a range of supplemental benefits, including medical, dental, vision, life, disability, and other insurance plans that offer an optional layer of financial protection. We offer an ESPP (employee stock purchase program) and a 401K program which allows you to contribute typically within 30 days of starting, with a company match after 12 months of tenure. Everforth Apex also offers a HSA (Health Savings Account on the HDHP plan), a SupportLinc Employee Assistance Program (EAP) with up to 8 free counseling sessions, a corporate discount savings program and other discounts. In terms of professional development, Everforth Apex hosts an on-demand training program, provides access to certification prep and a library of technical and leadership courses/books/seminars once you have 6+ months of tenure, and certification discounts and other perks to associations that include CompTIA and IIBA. Everforth Apex has a dedicated customer service team for our Consultants that can address questions around benefits and other resources, as well as a certified Career Coach. You can access a full list of our benefits, programs, support teams and resources within our 'Welcome Packet' as well, which an Everforth Apex team member can provide.

Everforth 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, registered domestic partner status, marital status, disability, status as a crime victim, protected veteran status, political affiliation, union membership, or any other characteristic protected by law. Everforth Apex will consider qualified applicants with criminal histories in a manner consistent with the requirements of applicable law.

If you require an accommodation under the Americans with Disabilities Act to participate in an interview with a virtual recruiter or to use our website for a search or application, please contact our Benefits Department at or . Please note that this contact information is strictly to be used for medical ADA accommodations and that no other inquiries will be answered.

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