Sr Engineer - Software Development, Onsite

Senior Engineer

The Senior Engineer is a highly experienced technical leader responsible for architecting, securing, and evolving enterprise IT platforms and services. Senior Engineers provide deep subject-matter expertise, lead complex initiatives, influence technical strategy, and serve as trusted advisors across IT, Security, and Engineering teams. This role emphasizes architectural thinking, cross-domain problem solving, and long-term system reliability and security.

This is an onsite position, located in Springfield, Missouri.

Essential Functions:

• Lead the development and optimization of distributed microservices powering core retail and e-commerce platforms, specifically focusing on cloud-native, "headless" commerce implementations. Architect high-performance, stateless services for critical digital customer touchpoints, including shopping carts, product catalog indexes, and promotional calculation engines.
• Implement and extend critical retail functionalities, including real-time Global Inventory Visibility, complex fulfillment sourcing rules, and customized checkout/order routing pipelines.
• Design and build high-throughput integration flows between digital commerce platforms and enterprise systems (ERP, WMS, POS, and Payment Gateways) using a mix of RESTful APIs and asynchronous event-streaming.
• Orchestrate tokenized digital checkout systems, credit card vaulting integrations, and fraud-detection touchpoints. Secure end-to-end user transactions while maintaining strict PCI-DSS compliance standards.
• Architect systems to absorb extreme traffic concurrency and volume spikes during peak e-commerce sales events (e.g., Black Friday, Cyber Monday, or flash promotions)
• Drive the containerization of core retail services and cloud infrastructure using Docker and Kubernetes (AKS/EKS/Open Shift).
• Performance Engineering:
  Provide expert guidance on performance tuning (JVM heap settings, thread pool management), high availability, and fault-tolerant circuit breaker patterns (e.g., Resilience4j).
• Take ownership of automated build and deployment pipelines, ensuring that core microservices are seamlessly deployed via Jenkins, Git Lab CI, or Git Hub Actions.
• Work with Product Managers and business stakeholders to translate complex digital commerce and supply chain requirements into lean, high-performing technical designs.
• Perform code reviews, establish enterprise coding standards for Java/Spring Boot, and mentor engineers in distributed systems design best practices.
• Lead post-incident reviews and drive systemic remediation and reliability improvements
• Author and maintain high-level architectural documentation and technical standards
• Mentor Engineers and Associate Engineers; set the technical bar for the organization
• All other duties as assigned

Experience/

Qualifications:

• Minimum Degree
  
  Required:
  
  Bachelor's Degree in Computer Science, Information Technology, Engineering, or equivalent experience
• Years of
  
  Experience:
  
  8+ years in enterprise software development, with 4+ years dedicated to designing and scaling microservices within a retail or e-commerce ecosystem.
• Domain Expertise:
  Deep knowledge of distributed systems, event-driven architecture, API-first design, and domain-driven design (DDD) principles in a retail context
• Proven ability to design and support mission-critical systems
• Experience leading enterprise transformations or large-scale migrations
• Exceptional communication and technical leadership skills

Knowledge, Skills, and Ability:

• Advanced proficiency in Java 11/17+, Spring Boot, and Spring Cloud. Proven experience building resilient, low-latency microservices that manage transactional logic.
• Deep understanding of internal vs. external communication patterns, including REST/JSON, gRPC for high-performance inter-service communication, and GraphQL for flexible headless e-commerce frontend delivery.
• Hands-on experience with distributed caching layers like Redis to optimize real-time product catalogs, shopping cart states, and high-frequency inventory lookups.
• Strong implementation knowledge of modern security standards including OAuth2, OpenID Connect (OIDC), JWT, and Spring Security to safeguard customer transactions and…