Senior Software Developer

About the Role

ProSearch is partnering with a confidential Information Technology client to hire a Senior Software Developer for the Portland, Maine location. This position blends hands on software development with technical leadership responsibilities. It is an ideal opportunity for a developer who is comfortable guiding a small team while contributing directly to the architecture and performance of mission critical systems. The environment supports high volume processing and demands exceptional reliability, security, and speed. Its systems use a highly segmented architecture to ensure strong security, dependable uptime, and efficient performance across a diverse client base. Every component is designed with redundancy, compliance, and scalability in mind.

Key Responsibilities

• Lead and mentor a development team of three to four developers while remaining actively involved in development work
• Design and maintain public facing web applications and API endpoints for payment processing
• Architect backend services and database schemas that support high volume and high availability environments
• Ensure the reliability of credit card and ACH processing systems that operate continuously
• Maintain PCI Level 1 compliance across applications, infrastructure and processes
• Conduct security reviews and penetration testing while applying OWASP Top 10 best practices
• Monitor and optimize performance for large scale transaction processing
• Manage redundancy and high availability strategies for critical services
• Balance hands on software development with team leadership and project coordination

Required Qualifications

Technical Expertise

Security and Compliance

Leadership and Management

Preferred Qualifications

Work Environment

Why Join Us

This position gives you the opportunity to work on systems that have a direct impact on thousands of daily transactions. You will play a key role in strengthening a secure and high performing platform while guiding a team of developers who value excellence and collaboration. This is a place where technical leadership and hands on development are equally important and where your contributions help support clients who rely on nonstop payment processing.

Ready to Apply

If you are an experienced Senior Software Developer who thrives in high responsibility environments and enjoys leading development efforts while building secure and scalable systems, we encourage you to apply through ProSearch. This is your opportunity to shape the future of a mission critical payment processing platform in Portland ME.