Full Stack Developer - Flexible Hours

Looking to level up? ReferTrac is hiring a Mid Full Stack Developer - Flexible Hours in Fitchburg, WI, US. This role focuses on high-scale systems and cross-functional collaboration. Ideal for candidates who excel in Fitchburg, WI, US-based or remote environments. **ReferTrac \| Financial Institution SaaS \| Remote (U.S.)** ReferTrac is a secure SaaS platform built specifically for banks and credit unions to manage internal referral tracking, onboarding and lead management workflows. We are looking for a Lead Backend Systems Architect with deep PHP expertise to own and evolve our backend infrastructure. This is a systems\-level role focused on architecture, scalability, and security — not ticket\-based development. ReferTrac is a rapidly growing start\-up with future exit strategy. Opportunity for developer to grow in ownership of company. **Core Tech Stack** \- PHP (primary application layer) \- MySQL / relational database architecture \- AWS infrastructure (EC2, RDS, S3, IAM) \- RESTful API architecture \-Role\-based permission systems \- Audit logging frameworks **What You’ll Own** \- Architecting and scaling our PHP backend \- Refactoring and optimizing existing codebase \- Database schema design and performance tuning \- Security\-first architecture (encryption, access control) \- Audit trail and logging systems \- Multi\-tenant SaaS performance optimization \- AWS deployment and infrastructure collaboration \- Technical documentation for vendor risk reviews **Required Experience** \- 5\+ years professional PHP development \- Experience building production SaaS platforms \- Strong object\-oriented programming and system architecture experience \- Deep understanding of relational databases \- Experience with secure authentication systems \- API architecture and integrations \- Performance tuning at scale \- Strong Bonus Experience \- Experience with Laravel or modern PHP frameworks \- Fintech or compliance software background \- SOC\-2 familiarity \_ DevOps exposure **Compensation** \- Competitive base salary ($80,000–$120,000 with equity ownership opportunity) \- Flexible remote work \- Equity discussion for the right candidate Pay: $80,000\.00 \- $140,000\.00 per year Benefits: * Flexible schedule Work Location: Hybrid remote in Fitchburg, WI 53711 Listing compiled for ITJobNotify. Apply on the company site for the latest details.