Software Engineer III (C++)

CSI; United States; Remote; USD 120,000 - 160,000; Full time

Job summary

Computer Services, Inc. (CSI) seeks a Software Engineer III to design, code, test, and debug scalable backend services using TypeScript, Node.js, and C++.

You will modernize legacy systems, deliver secure integrations, and mentor junior engineers within a highly integrated online banking ecosystem. The role emphasizes API design, third‑party integrations, and service-oriented architectures, with ownership of major projects and collaboration with cross‑functional teams.

Qualifications

• Accredited education in technology; advanced degrees or certifications preferred.
• 7+ years of software engineering experience with backend service and complex integrations.
• Strong proficiency in C++, TypeScript, Node.js and modern backend patterns.
• Experience with designing, building, testing, debugging scalable applications in production.
• Experience with financial systems, core banking platforms, or fintech integrations is preferred.
• Familiarity with API design, contracts, third‑party integrations, and system interoperability.

Responsibilities

• Lead development and rollout of large backend projects with complex integrations.
• Enforce coding standards, design secure APIs, and modernize legacy C++ systems.
• Manage projects and ensure timely delivery of integration-heavy initiatives.
• Craft technical specifications, API contracts, and modernization approaches.
• Mentor engineers in backend development, integrations, and modern architectures.
• Drive SOA, CI/CD practices, and Agile processes across teams.

Skills

TypeScript

Node.js

C++

Backend development

API design

CI/CD

Agile methodologies

System integration

Education

Bachelor's degree in Computer Science or related field

Tools

Git

API testing tools

Job description

Job Description:

Software Engineer III’s design, code, test, and debug scalable applications and services using modern TypeScript and Node.js patterns; maintain and document program changes with a focus on reliability, performance, and integration quality. They competently perform work in complex sections of at least one major CSI application, with a strong emphasis on backend services and third-party integrations, including core systems within the online banking ecosystem. The role also includes working with and modernizing existing C++ codebases and services, helping to evolve legacy systems into more maintainable, service-oriented architectures. They maintain and document program changes while working on complex integrations and system migrations. This role requires use of imagination, originality, and ingenuity to uphold high programming standards and deliver resilient, secure, and high-performing integration solutions with significant business impact.

Responsibilities:

• Project Leadership: Take ownership of the development and rollout of entire products or large projects, particularly those involving backend services, C++ modernization efforts, and complex third-party integrations.

• Standards and Practices: Enforce department coding standards and best practices, with a strong emphasis on TypeScript, Node.js, API design, and secure integration patterns, while contributing to the modernization of legacy C++ systems.

• Project Management: Demonstrate effective and efficient project management skills, ensuring successful delivery of integration-heavy initiatives and legacy-to-modern platform migrations.

• Technical Specifications: Write technical specifications, including API contracts, integration patterns, and modernization approaches for legacy C++ systems; identify project and programming risks, particularly related to third-party dependencies and system interoperability.

• Coaching and Mentorship: Champion processes and technologies (Agile, CI/CD, service-oriented architecture) while coaching colleagues on backend development, integration practices, and modernization strategies.

• Expertise and Innovation: Showcase expertise in software engineering with a focus on backend systems, integration frameworks, and emerging Node.js and TypeScript technologies, while contributing to the evolution of legacy C++ platforms.

• Programming Knowledge: Apply knowledge of TypeScript, Node.js, and related backend technologies effectively; demonstrate working familiarity with C++ and the ability to support, maintain, and modernize existing systems.

• Thought Leadership: Provide proactive investigation, problem-solving, and thought leadership, particularly in integration design, system interoperability, and strategies for migrating legacy platforms to modern architectures within the online banking domain.

• Mentorship: Offer coaching and mentorship to less experienced Software Engineers, especially in building scalable services, managing complex integrations, and navigating legacy-to-modern transitions.

Requirements:

• Accredited university, college, or trade school education and training in applicable technology; advanced degrees or relevant certifications preferred.

• 7+ years of successful, relevant software engineering experience, with a strong focus on backend service development and complex system integrations.

• Advanced proficiency with C++, experience with TypeScript and Node.js, including modern backend development patterns, scalable service design, and application performance considerations.

• Experience designing, building, testing, debugging, and maintaining scalable applications and services in a production environment.

• Experience with financial systems, core banking platforms, online banking ecosystems, APIs, or third-party vendor integrations strongly preferred.

• Working familiarity with C++ codebases, including the ability to support, maintain, and contribute to modernization of legacy systems.

• Experience with API design, API contracts, third-party integrations, vendor dependencies, and system interoperability.

• Ability to work within complex sections of major applications, preferably within online banking, financial technology, or other highly integrated enterprise environments.

• Experience contributing to legacy-to-modern platform migrations, service-oriented architectures, CI/CD practices, and Agile development environments.

• Proven ability to take ownership of large projects or product rollouts and manage delivery effectively across technical and cross-functional stakeholders.

• Ability to coach, mentor, and support less experienced engineers in backend development, integration practices, and modernization strategies.

As a forward-thinking software provider, Computer Services, Inc. (CSI) helps community and regional financial institutions solve their customers’ needs through open and flexible technologies. In addition to its award-winning core banking platform, these include the latest in lending, digital banking, payments, financial crime prevention and cybersecurity. Building on its 60-year track record of personalized service, CSI is shaping the future of banking and empowering its customers to rival their competition. For more information about CSI, visit www.csiweb.com

CSI provides rewarding and challenging career opportunities for our employees. When determining your pay, we consider various factors such as your skills, qualifications, experience and location. Along with a competitive salary, this position includes eligibility for incentive awards based on both individual and business performance. We also offer a comprehensive range of benefits. To learn more about our benefits, visit Benefits Summary

CSI is an Equal Opportunity Employer. All qualified applicants will receive consideration for employment without regard to race, color, religion, sex, pregnancy, sexual orientation, gender identity, national origin, age, physical and mental disability, marital status, veteran status, or any other characteristic protected by applicable law. If you need an accommodation during the recruitment process, please email us at [e-mail] and we will work with you to meet your accessibility needs.

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Visa Sponsorship: We are unable to offer visa sponsorship for this position. Applicants must be authorized to work in the United States without the need for sponsorship now or in the future.