Staff Software Development Engineer – Agentic Applications and Experiences

WEX is transforming the future of fleet payments by building agentic, scalable solutions that power its industry-leading fuel card platform. As a Staff Software Development Engineer, you will design, develop, and enhance solutions in a cloud-native environment using modern technologies like Java and AWS.

Responsibilities:

• Design, develop, and deliver delightful product experiences that are powered by Agentic capabilities, scalable, reliable software solutions using modern technologies such as Java, Kafka, Elasticsearch, and cloud-native platforms
• Contribute to architecture and design decisions that support highly available, secure, and scalable systems
• Build and maintain clean, efficient, well-tested, and maintainable code
• Develop and optimize RESTful APIs and backend services
• Participate in code reviews, technical discussions, and collaborative problem-solving sessions
• Troubleshoot, debug, and resolve complex technical challenges
• Work across technology stacks and quickly adapt to new tools and frameworks
• Stay current with emerging technologies and industry best practices to continuously improve engineering practices
• Ensure operational excellence and best customer experience for all the products and systems owned by the team

Requirements:

• Bachelor's degree in Computer Science, Engineering, or a related technical field
• 7+ years of software engineering experience designing, developing, and supporting enterprise-scale applications
• Strong experience building cloud-based applications and infrastructure using infrastructure-as-code practices
• Proficiency with event streaming platforms such as Kafka
• Experience with Elasticsearch, including indexing strategies, query optimization, and data analysis
• Experience working with cloud platforms such as AWS
• Strong understanding of software engineering principles, including data structures, algorithms, object-oriented design, scalability, availability, and reliability
• Strong problem-solving skills with the ability to analyze complex technical challenges
• Excellent written and verbal communication skills with a collaborative mindset
• Master's degree in Computer Science, Software Engineering, or a related field
• 8+ years of software engineering experience
• Experience and knowledge in building Agentic/AI solutions for real world problems
• Experience designing and implementing event-driven architectures
• Experience working with card payments or financial services platforms
• Hands-on experience with cloud-native technologies including Docker and Kubernetes
• Knowledge of API security principles and PCI DSS compliance requirements
• Experience working within existing codebases and improving legacy systems
• Strong backend development expertise with Java or C#, including frameworks such as Spring Boot
• Experience designing, building, and optimizing RESTful APIs, OData services, and SQL-based solutions
• Proven experience developing internet-scale services with a focus on scalability, security, availability, and reliability