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WEX

Senior Backend Software Engineer

WEX

. Design, develop, and maintain robust, scalable, and high-performance object oriented code in our backend services .

Posted 5/20/2026full-timeRemote • California • 🇺🇸 United StatesSenior💰 $121,500 - $145,500 per yearWebsite

Tech Stack

Tools & technologies
CloudDockerGRPCJavaKafkaKubernetesSpring BootSpringBootSQL

About the role

Key responsibilities & impact
  • Design, develop, and maintain robust, scalable, and high-performance object oriented code in our backend services
  • Develop public REST APIs using Java and internal gRPC APIs for inter-service and inter-system communication
  • Craft systems designs, lead design decisions, and drive alignment with other senior engineers
  • Write automated unit tests, integration tests, end-to-end tests, concurrency tests, load/performance tests
  • Analyze existing systems to identify bottlenecks, tech debt, and implement scalability, and stability improvements
  • Implement automation for testing, monitoring, healing, and scaling applications, continuous integration and deployment to reduce time to market
  • Collaborate with cross-functional teams, including product managers, designers, and other engineers, to define and implement new features
  • Conduct code reviews (comment, approve, seek revisions, merge), mentor junior and mid-level engineers, and actively promote engineering best practices
  • Dive deep and troubleshoot complex issues, devise fixes, author root cause analysis documents, and ensure lasting performance and reliability
  • Conduct objective and comparative analyses of competing technologies to advise the team of pros and cons of a technology solution
  • Maintain robust documentation (design docs, run books, change management docs, and readiness plans)
  • Provide live-site support for production applications by monitoring systems, ensuring rapid incident resolution, and driving continuous improvement
  • Drive cross-team projects as a single-threaded-owner (STO) or tech lead, and actively unblock other engineers to make progress

Requirements

What you’ll need
  • Bachelor’s degree in Computer Science or Software Engineering
  • 5-8 years of professional experience in software engineering
  • Strong understanding of data structures and algorithms, object-oriented design, and problem-solving skills
  • Expertise in designing and developing internet-scale services with scalability, availability, security, and reliability design tenets
  • Excellent written and verbal communication skills, and a collaborative and empathetic mindset
  • Proficiency in backend development, with proficiency expertise in Java or C#, and frameworks like SpringBoot, building and optimizing RESTful APIs, ODATA framework, and SQL
  • Experience with event-driven architecture and tools like Kafka
  • Experience working on card payments
  • Familiarity with cloud-native architecture (containerization using tools such as Docker and Kubernetes)
  • Awareness of API security and PCI DSS compliance requirements

Benefits

Comp & perks
  • health, dental and vision insurances
  • retirement savings plan
  • paid time off
  • health savings account
  • flexible spending accounts
  • life insurance
  • disability insurance
  • tuition reimbursement

ATS Keywords

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Applicant Tracking System Keywords

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Hard Skills & Tools
JavaC#SpringBootREST APIsgRPCSQLdata structuresalgorithmsobject-oriented designevent-driven architecture
Soft Skills
problem-solvingcommunicationcollaborationmentoringleadershipanalytical thinkingempathydocumentationtroubleshootingcontinuous improvement