Software Engineer (Java/J2EE)

Important Notes

• Local candidates preferred.
• Only qualified candidates located near O'Fallon, MO will be considered due to the hybrid work requirement.
• No third-party candidates.
• Candidate must be on your company's payroll (your company must hold the candidate's visa).
• Industry: Payments
• Please submit competitive C2C rates based on the candidate's experience and skill set.

Position Overview

We are seeking a hands-on Software Engineer with strong expertise in Java/J2EE to develop highly scalable, high-performance microservices that support real-time financial transaction processing. The ideal candidate will have experience designing and building low-latency, high-throughput applications in a fast-paced Agile environment.

Key Responsibilities

• Design software components by translating business and product requirements into technical solutions.
• Break down project requirements into development tasks and provide accurate effort estimates.
• Develop clean, modular, scalable, and maintainable code following industry best practices.
• Design low-level components independently and contribute to high-level architecture discussions.
• Select appropriate data structures, frameworks, and technology stacks for optimal application performance.
• Build scalable microservices and RESTful APIs for enterprise applications.
• Research new technologies, develop proof-of-concepts, and recommend innovative solutions.
• Participate in peer code reviews and promote coding standards and best practices.
• Collaborate with cross-functional teams including Product Owners, QA, DevOps, and Architects.
• Take ownership of applications from development through production support and continuous improvement.

Required Qualifications

• Strong hands-on experience with Java, J2EE, Spring Framework, and Spring Boot.
• Experience developing RESTful Web Services and Microservices Architecture.
• Solid knowledge of Kafka and event-driven application development.
• Experience with JPA/Hibernate and relational databases.
• Strong understanding of data structures, object-oriented programming, and software design principles.
• Experience building highly scalable, high-availability, and high-performance applications.
• Knowledge of SOLID principles, design patterns, and continuous refactoring practices.
• Experience developing cloud-ready applications.
• Hands-on experience with Test-Driven Development (TDD).
• Familiarity with Continuous Integration (CI) and Continuous Delivery (CD) pipelines.
• Experience working in Agile Scrum environments.
• Excellent analytical, problem-solving, and communication skills.
• Strong collaboration and stakeholder management abilities.

Preferred Qualifications

• Experience building AI-assisted applications, autonomous or semi-autonomous agents, and agentic workflow systems.
• Experience developing distributed systems for high-volume transaction processing.
• Exposure to cloud platforms and modern DevOps practices.

Must-Have Skills

• Java
• J2EE
• Spring Boot
• Spring Framework
• RESTful Web Services
• Microservices
• Kafka
• JPA/Hibernate
• Test-Driven Development (TDD)
• CI/CD
• Agile Scrum
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