Freelance Java Developer Volunteer Jobs (NOW HIRING)

What We Need
Corpay is currently looking to hire an experienced Senior Java Developer within our North America Fuel division. This position falls under our Vehicle Payments line of business and is located in Buckhead, GA. This role is ideal for a highly skilled software engineer who enjoys building scalable, high-performance middleware services, integrating enterprise systems, and collaborating with cross-functional Agile teams. You will report directly to the Development Manager and will be joining our growing technology team.
How We Work
As a Senior Java Developer , Corpay will set you up for success by providing:

• Assigned workspace in our Buckhead, GA office
• Company-issued equipment
• Formal, hands-on training

Role Responsibilities
The responsibilities of the role will include:

• Designing, developing, testing, and maintaining enterprise-grade Java applications and middleware services.
• Building scalable RESTful APIs and microservices using Java and Spring Boot.
• Developing integrations with internal and external systems, including banking partners, payment processors, and third-party platforms.
• Designing and implementing solutions that interact with Oracle and MySQL databases.
• Troubleshooting production issues, perform root cause analysis, and implement sustainable fixes.
• Participating in architecture discussions, code reviews, and technical design sessions.
• Collaborating effectively within Scrum teams and coordinate across multiple Agile teams, product owners, business stakeholders, and QA teams.
• Ensuring application performance, security, scalability, and reliability

Qualifications & Skills
• Bachelor's Degree in Computer Science, Engineering, Information Systems, or related field (or equivalent experience).
• 6+ years of hands-on software development experience using Java.
• Strong proficiency in Java, Spring Boot, RESTful API development, and microservices architecture.
• Experience working with Oracle and MySQL databases.
• Strong understanding of software design patterns, object-oriented programming, and clean coding practices.
• Experience with Git and modern software development workflows.
• Proven ability to troubleshoot, debug, and resolve complex technical issues.
• Experience working in Agile/Scrum environments.
• Excellent verbal and written communication skills.
Preferred Qualifications
• Experience with RabbitMQ or other messaging technologies.
• Familiarity with MuleSoft integration platforms.
• Experience building event-driven architectures and asynchronous processing solutions.
• Knowledge of cloud-native development and containerization technologies.
• Experience with CI/CD pipelines and DevOps practices.
AI-Assisted Development Experience (Highly Desired)
• Experience using GitHub Copilot or similar AI-assisted development tools as a force multiplier for software engineering productivity.
• Ability to effectively leverage AI-powered coding assistants for code generation, refactoring, unit test creation, documentation, and troubleshooting while maintaining high standards of code quality and security.
• Demonstrated understanding of how to combine AI-assisted development with sound engineering practices, peer reviews, and architectural standards.
Industry Experience (Highly Preferred)
Candidates with FinTech experience will be strongly preferred, particularly experience involving:
• Banking and financial institution integrations
• Payment processing systems
• Credit card invoicing and settlement
• Accounts payable and receivable platforms
• Bill payment (BillPay) solutions
• Financial data exchange and transaction processing
Success Factors
• Hands-on developer who enjoys writing high-quality code.
• Strong problem solver who can quickly diagnose and resolve technical challenges.
• Collaborative team player who works effectively across engineering, product, and business teams.
• Comfortable operating in a fast-paced Agile environment.
Benefits & Perks

• Medical, Dental & Vision benefits available the 1st month after hire
• Automatic enrollment into our 401(k) plan (subject to eligibility requirements)
• Virtual fitness classes offered company-wide
• Robust PTO offerings including major holidays, vacation, sick, personal, & volunteer time
• Employee discounts with major providers (i.e. wireless, gym, car rental, etc.)
• Philanthropic support with both local and national organizations
• Fun culture with company-wide contests and prizes

#LI-SN1
About Corpay
Corpay is a global technology organization that is leading the future of commercial payments with a culture of innovation that drives us to constantly create new and better ways to pay. Our specialized payment solutions help businesses control, simplify, and secure payment for fuel, general payables, toll and lodging expenses. Millions of people in over 80 countries around the world use our solutions for their payments.
At Corpay, we are committed to fostering an inclusive and respectful workplace where employees are valued for their diverse perspectives, experiences, and contributions. We believe that diversity, equity, and inclusion strengthen our teams, drive innovation, and support our continued success globally.
As part of our hiring process, offers of employment may be subject to the successful completion of pre-employment screening conducted by an authorized third-party provider, in accordance with applicable laws and Corpay policies. Screening requirements may include employment references, identity verification, criminal record checks, financial or sanctions screening, and other background checks relevant to the role and permitted by local law.
Notice to Recruitment Agencies and Search Firms: Corpay does not accept unsolicited resumes from agencies or search firms without a valid written agreement in place. Any unsolicited candidate submissions will become the property of Corpay, and no fees will be paid related to such submissions.
Learn more about Corpay: https://www.corpay.com
Transparency & Compliance
Equal Opportunity Employer
Corpay is committed to providing equal employment opportunities to all applicants and employees. Employment decisions are made without regard to race, color, religion, sex (including pregnancy), gender, gender identity or expression, sexual orientation, national origin, ancestry, age, disability, marital status, genetic information, military or veteran status, or any other characteristic protected by applicable law. Corpay is committed to fostering an inclusive workplace where individuals are respected and valued for their diverse perspectives, experiences, and contributions. If you require reasonable accommodation during any part of the application or interview process, please notify a representative of the Human Resources Department.
Use of Artificial Intelligence in Hiring
Corpay may use artificial intelligence (AI) and other technology-enabled tools to support certain aspects of the recruitment process, such as application screening, candidate assessment, or interview scheduling. These tools are designed to enhance efficiency, consistency, and fairness throughout the hiring process. AI tools do not make final hiring decisions. All employment decisions involve human review. Corpay is committed to the responsible use of AI, including appropriate oversight and safeguards designed to support fair and unbiased outcomes.
Candidate Privacy Notice
For information about how Corpay processes personal information during the recruitment process, please review our Candidate Privacy Notice: https://www.corpay.com/privacy-policy.
Pay Philosophy
Corpay is committed to fair, equitable, and transparent compensation practices. Compensation decisions are based on objective, job-related factors including skills, experience, qualifications, and market benchmarks. Where required by applicable law, salary or compensation ranges will be included in the job posting or provided prior to the interview process, where required by applicable law. Additional compensation elements such as bonuses, incentives, benefits, or variable pay may apply where applicable.