Specialized Software Developer

KellyMitchell Group; St. Louis (MO); Hybrid; USD 72,000 - 103,000; Full time

Benefits offered by this job

Medical Insurance

Dental Insurance

401K

Job summary

KellyMitchell is seeking a Senior Java/AWS Engineer for transactional systems in St. Louis, MO. The role focuses on designing and modernizing large-scale systems, migrating legacy applications to Java and AWS, and delivering reliable transaction processing within a microservices framework.

The position involves hybrid work, collaboration across teams, and contributing to cross-system data integrity and outage information handling.

Qualifications

• Strong hands-on Java development experience for enterprise-scale applications.
• Strong AWS experience with cloud-based applications.
• Experience designing and supporting transactional systems with data consistency and reliability.
• Knowledge of microservices architecture and distributed components.
• Experience modernizing or migrating legacy apps.

Responsibilities

• Design, develop, and maintain Java code for large-scale transactional systems and microservices.
• Contribute to modernization efforts, migrating legacy apps from TIBCO to Java and AWS.
• Support migration of five applications across timelines.
• Design and implement reliable transactional workflows ensuring data consistency and integrity.
• Develop event-driven architectures and integrate Kafka, SQS, and EventBridge.

Skills

Java development

AWS

Transactional systems

Microservices

Event-driven

Kafka

Problem solving

Tools

Apache Kafka

Amazon SQS

Amazon EventBridge

Job description

Job Summary

Our client, a leading telecommunications provider, is seeking a Senior Java/AWS Engineer – Transactional Systems. This individual will play a key role in developing and modernizing large-scale transactional systems that track customer experiences during service interruptions.The ideal candidate will have strong Java and AWS expertise, along with a deep understanding of transactional systems, microservices architecture, and reliable transaction processing. This role will support ongoing modernization efforts, including migrating legacy applications from TIBCO to Java and AWS.

Contract Details

• Contract Type and Duration: Contract
• Work Location: St. Louis, MO
• Work Arrangement: Hybrid

Core Responsibilities

• Design, develop, and maintain Java code for large-scale transactional systems and microservices
• Contribute to ongoing modernization initiatives, including migrating legacy applications from TIBCO to Java and AWS
• Support the migration of five applications, with two planned for this year and three planned for next year
• Design and implement reliable transactional workflows, ensuring data consistency, transaction integrity, and predictable system behavior across interconnected components
• Develop and maintain event-driven architectures and messaging integrations using Kafka, Amazon SQS, and Amazon EventBridge
• Collaborate across complex, interconnected systems involving numerous components, dependencies, and data points to deliver accurate and reliable customer outage information
• Troubleshoot complex system behaviors, identify potential failure points, and contribute ideas to improve system reliability, scalability, and maintainability

Required Skills/Experience (Must-Haves)

• Strong hands-on Java development experience, including building and maintaining enterprise-scale applications
• Strong AWS experience, with the ability to develop and support cloud-based applications
• Demonstrated experience designing, developing, and supporting transactional systems, including a strong understanding of transaction lifecycles, data consistency, and reliable transaction processing
• Strong understanding of microservices architecture and how distributed components interact within complex systems
• Experience building reliable applications that handle complex business workflows, data dependencies, and interconnected services
• Experience developing, modernizing, or migrating legacy enterprise applications
• Strong analytical and problem-solving skills, with the ability to navigate complex systems and troubleshoot issues across multiple components

Preferred Skills/Experience (Nice-to-Haves)

• Hands-on experience with Apache Kafka for event streaming and asynchronous communication
• Experience with Amazon SQS for message queuing and decoupled system integrations
• Experience with Amazon EventBridge for event-driven architectures and event routing
• Direct experience migrating applications from TIBCO to Java and AWS
• Experience modernizing legacy transactional platforms into cloud-native microservices
• Experience supporting large-scale telecommunications, network operations, outage management, or other complex enterprise systems
• Experience with event-driven systems that aggregate multiple data points into a consistent, reliable view of business events and customer impact

Key Competencies & Behaviors

• Willingness to speak up, ask questions, share ideas, and seek clarification rather than make assumptions
• Ability to work effectively with experienced engineers and contribute to technical discussions and design decisions
• Comfortable working in a fast-moving environment where priorities may shift due to outages or changing business needs
• Able to understand complex interactions between services, dependencies, data flows, and transactional processes without becoming overwhelmed
• Takes responsibility for delivering reliable solutions, identifying potential issues, and contributing to continuous improvement

Work Environment

• Location: St. Louis, MO
• Onsite, Hybrid, or Remote: Hybrid
• Schedule: Typically 9:00 a.m.–5:00 p.m
• Collaborative, technically complex, and fast-paced work environment, with a strong emphasis on asking questions, sharing ideas, and working through challenging system integrations
• Project focused on modernization of legacy transactional applications, including five planned TIBCO-to-Java/AWS migrations

Compensation & Benefits

• Pay Range: The approximate pay range for this position is between $52.00and $75.00 per hour. Please note that the pay range provided is a good faith estimate. Final compensation may vary based on factors including but not limited to background, knowledge, skills, and location. We comply with local wage minimums.
• Medical, Dental, & Vision Insurance Plans
• Employee-Owned Profit Sharing (ESOP)
• 401K offered

About KellyMitchell

At KellyMitchell, our culture is world class. We’re movers and shakers! We don’t mind a bit of friendly competition, and we reward hard work with unlimited potential for growth. This is an exciting opportunity to join a company known for innovative solutions and unsurpassed customer service. We're passionate about helping companies solve their biggest IT staffing & project solutions challenges. As an employee-owned, women-led organization serving Fortune 500 companies nationwide, we deliver expert service at a moment's notice.