OneMain Financial Jobs

Senior Full Stack Developer (E5028) - 260018 : KNW-C60

Description

Job Summary 
This position contributes to the architecture, design, development, implementation, and lifecycle support of web-based applications. The efficiency, effectiveness, and quality of the applications and systems under this position's charge are crucial to the organization and key stakeholders—including volunteer governance, leadership, staff, members, customers, and partners—since these systems significantly impact the organization's ability to monetize its intellectual property. The role typically reports to a Director or Manager level position and does not have any direct reports. This position will be responsible for successfully delivering their assignments under the guidance of the director and tech lead.

Los Alamitos, CA | Hybrid (3 days onsite / 2 remote)
We’re looking for a Senior Full Stack Developer who enjoys real-world challenges and isn’t afraid to get their hands dirty across both modern and legacy stacks.
Must-haves:

• Strong experience with WordPress & PHP
• Deep knowledge of Next.js (v14.2 )
• A problem-solver who enjoys tackling complex challenges
• Experience with AI-assisted development tools to improve speed and code quality

Why this role?
You’ll work on high-impact web applications, balancing WordPress/PHP with modern Next.js architecture, contributing to scalable, production-grade systems used by thousands.

Qualifications

Education

• Bachelor's degree or equivalent experience in Computer Science or equivalent--graduate degree highly desired. Appropriate work experience may substitute for academic credentials Req

Work Experience

• 7-10 years or relevant experience. Req

Skills and Requirements

• Architecture and system design:
• - Basic knowledge of Enterprise Architecture and system design.
• - Knowledge of common design patterns (e.g., MVC, Singleton, Factory) and their application in software development.
• - Ability to learn and practice best practices in code design to ensure maintainability and scalability.
• Project leadership and domain knowledge:
• - Ability to understand the business and strategic vision.
• - Proficiency is leading large initiatives and manage resources.
• - Experience in understanding the business language.
• - Basic experience in the areas of publications, conference event management, non-profit governance, volunteer management, digital library, markeing & sales technology, and association membership.
• Content Management Systems:
• - Expertise in WordPress CMS (or Drupal) and custom PHP development.
• - Experience building high-traffic eCommerce websites for enterprises using WordPress/Drupal, focusing on high availability, response time, and performance.
• - Proficiency in implementing WordPress as a headless backend system with WP REST API.
• - Knowledge of implementing and integrating with eCommerce packages/software such as WooCommerce and WooCommerce API.
• - Experience with security issues with WordPress/Drupal and how to address them is required.
• - Knowledge of integrating WordPress website with other internal or external services and applications is required.
• - Experience digital media and publications is preferred
• - Proficient understanding of cross-browser compatibility issues and ways to work around them
• JavaScript, Typescript, and Front-End Development:
• - Command of the latest JavaScript frameworks: MEAN & MERN stack (MongoDB, Express, Next.js/AngularJS/React, Node.js).
• - Expertise in Typescript, HTML, CSS, Tailwind, JSON, JavaScript, and AJAX.
• - Understanding of WebSockets, XMLHttpRequest, client-side caching, local storage, JavaScript modules, JavaScript scope and function execution, and Cross-Origin Resource Sharing (CORS).
• Web Services and APIs:
• - Proficient in web services such as REST API.
• - Experience integrating WordPress and Drupal websites with other internal or external services and applications.
• Databases:
• - Proficient in modern databases such as MongoDB, DynamoDB, MySQL, etc.
• - Experience in data modeling and data analysis.
• Authentication and Security:
• - Knowledge of LDAP and Single Sign-On (SSO) setups.
• - Experience setting up user authentication using standard authentication services.
• - Understanding of security issues with WordPress and methods to address them.
• Cloud and System Administration:
• - Proficient in AWS instrafrtcuture administration and setup.
• - Proficient in Linux OS system administration.
• - Implementation experience on AWS platforms or other hosting sites (e.g., WP Engine).
• - Experience with implementing applications on AWS platform or other hosting site for example: Wp-engine
• - Experience with application servers (any modern servers), reverse proxy servers, and web servers is required.
• CI/CD (Continuous Integration/Continuous Deployment):
• - Proficient understanding of CI/CD pipelines and tools.
• - Experience with tools like Jenkins, GitHub Actions, GitLab CI, AWS codepipeline, or CircleCI.
• - Knowledge of automating build, test, and deployment processes.
• - Familiarity with containerization technologies like Docker and orchestration tools like Kubernetes.
• - Proficient understanding of code versioning/integration/deployment tools. For example:- Subversion and Hudson
• Development Tools and Practices:
• - Proficiency with Git and GitHub.
• - Experience with application servers, reverse proxy servers, and web servers.
• - Strong knowledge of object-oriented design concepts, performance tuning, and current technology trends.
• - Understanding of cross-browser compatibility issues and solutions.
• Project Management and Collaboration:
• - Hands-on experience with project management tools like JIRA.
• - Good knowledge of Agile and Waterfall methodologies.
• - Experience in project estimation and planning.
• - Ability to work as part of a team and interact with all levels of management.
• - Strong business acumen to understand business strategies, customer objectives, processes, and products.
• User Experience and Design:
• - Strong knowledge of UX and responsive design principles.
• - Strong knowledge of Search Engine Optimization (SEO) principles and how to adhere to them in applications.
• - Strong knowledge of ADA compliance
• - Strong knowledge of PCI compliance
• Communication and Analytical Skills:
• - Fluent in English with a strong command of grammar and syntax.
• - Excellent presentation and written communication skills to effectively present ideas and concepts to volunteers, users, stakeholders, and technical personnel.
• - Strong analytical skills and attention to detail.
• - Ability to mentor junior developers and foster skill development within the team.
• - Have strong business acumen to understand the business strategy, customers’ objectives, processes, and products in order to make educated recommendations.
• - Ability to work as part of a team, as well as with all levels of management.
• Application Security:
• - Strong understanding of web application security principles and best practices.
• - Experience identifying and mitigating common security vulnerabilities such as SQL injection, XSS, CSRF, and others as outlined in the OWASP Top Ten.
• - Proficient in implementing secure authentication and authorization mechanisms, including OAuth, JWT, and other standard protocols.
• - Knowledge of secure coding practices to ensure data protection and privacy.
• - Experience with security tools and practices such as static code analysis, penetration testing, and security audits.
• - Familiarity with GDPR, CCPA, and other data protection regulations to ensure compliance.
• - A solid understanding of how web applications work including security principles and session management

Other Requirements:
As defined in IEEE Policies, individuals currently serving on an IEEE board or committee are not eligible to apply.

PLEASE NOTE: This position is not budgeted for employer-sponsored immigration support, this includes all persons in F (both CPT and OPT), J, H, L, or O status.

For information on work demands and conditions required for this position, please consult the reference document, ADA Requirements. This position is classified under Category I - Office Positions.

All qualified applicants will receive consideration for employment without regard to race, color, religion, sex, sexual orientation, gender identity, national origin, disability, or status as a protected veteran.
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Disclaimer: This job description is proprietary to IEEE. It outlines the general nature and key features performed by various positions that share the same job classification. It is not designed to contain or be interpreted as a comprehensive inventory of all duties and qualifications required of all employees assigned to the job. Nothing in this job description restricts management’s right to assign or re-assign duties to this job at any time due to reasonable accommodations or other business reasons.

Min: $125,000.00 Max: $154,000.00
Job : Technology

Primary Location : United States-California-Los Alamitos

:

Schedule : Full-time

Job Type : Regular

Job Posting : Jan 21, 2026, 2:26:01 PM