Senior Software Engineer (C#/.NET & AI)

Please note: This role is open only to candidates located in Chicago, IL; Dallas, TX; New York City, NY; Boston, MA; or Portland, ME.We are currently unable to provide immigration sponsorship or support, either now or in the future.At WEX, we simplify the business of running a business. Our WEX Benefits solutions reduce complexity and help employers manage the cost and administration of employee benefits.We are looking for passionate technologists, collaborators, and problem solvers to join our Benefits Technology team as we build the next generation of employer benefits platforms and services.As a Senior Software Engineer, you will work closely with Product Managers, customers, and engineering peers to understand the challenges employers face in the evolving benefits landscape. You will design and deliver scalable, high-quality solutions using modern engineering practices, including test-driven development and cloud-native architectures.You will have the opportunity to contribute to mission-critical systems, influence technical direction, and help shape engineering standards across the team.How You’ll Make An ImpactPartner with Product and stakeholders to understand customer challenges and translate them into technical solutionsDesign, build, test, and deploy scalable, secure, and high-quality software solutionsUse data to measure outcomes, validate assumptions, and drive engineering decisionsDevelop and maintain microservices and event-driven architecturesStrengthen engineering practices including TDD, BDD, and CI/CD automationSupport production systems through monitoring, incident response, and continuous improvementIdentify performance bottlenecks and optimize systems for scalability and reliabilityMentor peers and contribute to a culture of technical excellence and continuous learningTake ownership of work, operate independently, and deliver high-quality outcomes with minimal supervisionExperience You’ll BringSoftware Engineering & Systems7+ years of software engineering experienceStrong background in backend development, distributed systems, and scalable architectureProficiency in modern backend technologies such as C#, .NET, Java, or PythonStrong understanding of data structures, algorithms, and object-oriented designExperience building and consuming REST APIsHands-on experience with React or modern UI frameworksExperience with relational and NoSQL databases (e.g., SQL Server, PostgreSQL, MySQL, MongoDB)Strong knowledge of CI/CD pipelines and Git-based workflowsExperience with cloud-native development in AWS or AzureUnderstanding of software security principles and OWASP guidelinesExperience writing unit tests and maintaining high test coverageFamiliarity with Agile development methodologiesProven ability to deliver complex projects on timeCloud, DevOps & InfrastructureExperience with cloud services (AWS or Azure), including IAM, compute, storage, and API servicesFamiliarity with containerization using Docker and orchestration using KubernetesExposure to CI/CD tools such as GitHub Actions, GitLab CI, or JenkinsBasic understanding of Infrastructure-as-Code (Terraform preferred)Familiarity with observability tools (Prometheus, Grafana, CloudWatch, Azure Monitor)AI, Agentic Systems & Emerging TechnologiesFamiliarity with LLM concepts and frameworks such as LangChain, LlamaIndex, LangGraph, or CrewAIExposure to Retrieval-Augmented Generation (RAG) and interest in evolving toward Agentic RAG systemsUnderstanding of agentic workflows including tool use (function calling) and state managementAwareness of vector databases (e.g., Pinecone, Milvus) and semantic search conceptsInterest in emerging protocols such as Model Context Protocol (MCP)Experience or curiosity in building AI-native features and LLM-based automation in CI/CD pipelinesLeadership & CollaborationBachelor’s degree in Computer Science, Software Engineering, or related fieldStrong collaboration skills in agile, cross-functional, and distributed teamsAbility to communicate technical concepts and trade-offs clearly to both technical and non-technical stakeholdersProven ability to work effectively in geographically distributed teamsSelf-driven, proactive, and highly accountable for deliverablesContinuous learner with strong interest in evolving cloud and AI technologiesTechnology Must-HavesC# / .NET (or equivalent backend language such as Java or Python)ReactREST API development (ASP.NET or equivalent frameworks)DockerKubernetesSQL & NoSQL databasesCloud platforms (AWS / Azure)CI/CD pipelinesEvent-driven architectureNice to Have / Learn QuicklyTerraformHelm / ArgoCDGitHub ActionsGraphQLKafkaAzure advanced servicesThe base pay range represents the anticipated low and high end of the pay range for this position. Actual pay rates will vary and will be based on various factors, such as your qualifications, skills, competencies, and proficiency for the role. Base pay is one component of WEX's total compensation package. Most sales positions are eligible for commission under the terms of an applicable plan. Non-sales roles are typically eligible for a quarterly or annual bonus based on their role and applicable plan. WEX's comprehensive and market competitive benefits are designed to support your personal and professional well-being. Benefits include health, dental and vision insurances, retirement savings plan, paid time off, health savings account, flexible spending accounts, life insurance, disability insurance, tuition reimbursement, and more. For more information, check out the "About Us" section.Pay Range: $121,500.00 - $145,500.00