Contract React Js Developer Jobs in Riverside, CA

Description

About InfoSend

InfoSend is a national leader in eBilling, ePayment, Data Processing, and Bill Print & Mail services, trusted by organizations since 1996. With robust operations in CA, TX, FL, and IL we specialize in delivering complex mailing solutions with speed, precision, and security.

We are proud of our stable, growing business and our team of over 230 professionals-many of whom have built long-term careers with us. We prioritize employee development, internal promotions, and a supportive workplace culture built on collaboration, respect, and opportunity.

Position Summary

We are seeking a highly skilled Senior Software Engineer to own the backend architecture, data processing, and modernization of InfoSend's core EBPP (Electronic Bill Presentment & Payment) and digital delivery platforms. You will be the technical driver for scaling our PHP-based backend systems, optimizing high-volume transaction queues, and leading the strategic modernization of our client-facing portals from legacy jQuery/HTML to React/Next.js. This is a high-ownership role for an experienced engineer who thrives in complex environments, drives CI/CD excellence, and ensures SOC2/PCI compliance without sacrificing delivery velocity.

Job Responsibilities:

Backend Architecture & System Scaling

• Design, develop, and scale backend-heavy PHP services and REST APIs for EBPP job submission, invoice processing, and production tracking
• Optimize SQL databases (PostgreSQL/MySQL) and manage consumer queues for high-volume, distributed transaction processing
• Integrate complex data workflows and ensure high availability for mission-critical print/mail production systems

Strategic Modernization & Front-end Evolution

• Drive the technical execution of modernizing our client portals. Architect and build new UI components using React, Next.js, and Tailwind CSS
• Maintain, support, and incrementally refactor the existing jQuery/HTML frontend during the transition phase
• Leverage AI prototyping tools and coding assistants to accelerate UI/UX development and modernization efforts

CI/CD Ownership & DevOps Integration

• Own and optimize GitLab CI/CD pipelines for the Digital Delivery team. Manage version control, automated testing, and rollouts
• Implement zero-impact release strategies (canary deployments, automated rollbacks) to ensure reliable, weekly feature deliveries
• Partner with Platform Engineering to ensure seamless "Metal-to-Application" lifecycle integration and optimize deployment times

Security, Compliance & Data Integrity

• Ensure application security (OAuth), data integrity, and compliance with industry standards (including SOC, HIPAA, PCI, if applicable, etc.)
• Embed security-by-design principles into the SDLC and drive automated compliance evidence collection to maintain continuous audit readiness
• Manage secrets, enforce least-privilege access, and conduct regular security reviews to protect sensitive client billing and payment data
• Technical Leadership, Documentation & Process Improvement
• Document code / architecture; lead code reviews, process improvements, deployments/migrations
• Act as the technical anchor for the team: establish and enforce coding standards, troubleshoot critical system issues, and mentor junior/mid-level engineers
• Drive continuous improvement initiatives by identifying technical debt, optimizing legacy workflows, and elevating the overall engineering maturity of the Digital Delivery team

Requirements

Required Experience & Skills

• Experience: 7+ years of professional software engineering experience, with a heavy focus on backend development and distributed systems
• Backend Mastery: Deep proficiency in PHP 8+ and PHP frameworks, building REST APIs, microservices, and managing message queues (RabbitMQ is preferred)
• Database & Data Processing: Strong SQL experience optimizing relational databases (PostgreSQL/MySQL) for high-throughput transactional systems
• DevOps & CI/CD: Hands-on mastery of GitLab CI/CD pipelines and full SDLC ownership. Experience implementing automated testing and zero-downtime deployment strategies
• Core Frontend & Web Technologies: Strong proficiency in core web programming languages (PHP, HTML/CSS, jQuery) with extensive experience maintaining and troubleshooting legacy client portals
• Security Mindset: Strong understanding of authentication/authorization (OAuth, JWT), secure coding best practices, and experience building systems in regulated environments

Preferred Qualifications

• Experience maintaining or migrating legacy codebases (jQuery/HTML or FoxPro)
• Experience with React, Next.js, and Tailwind CSS for client portal modernization initiatives
• Familiarity with leveraging AI coding assistants for rapid prototyping and legacy code translation
• Ability to work independently and communicate effectively in a collaborative environment
• Linux development environment experience is a plus
• Bachelor's degree in Computer Science, Software Engineering, or equivalent experience

What we Offer

• Medical, dental, vision, and life insurance
• Supplemental and flexible spending options
• 401(k) with generous company match
• Paid time off, sick leave, and holidays
• Bonus opportunities
• Stability
• Casual dress and supportive team culture
• Employee Assistance Program