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

at Wex Inc in Chicago, Illinois, United States Job Description 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 Impact Partner with Product and stakeholders to understand customer challenges and translate them into technical solutions Design, build, test, and deploy scalable, secure, and high-quality software solutions Use data to measure outcomes, validate assumptions, and drive engineering decisions Develop and maintain microservices and event-driven architectures Strengthen engineering practices including TDD, BDD, and CI/CD automation Support production systems through monitoring, incident response, and continuous improvement Identify performance bottlenecks and optimize systems for scalability and reliability Mentor peers and contribute to a culture of technical excellence and continuous learning Take ownership of work, operate independently, and deliver high-quality outcomes with minimal supervisionExperience You'll BringSoftware Engineering & Systems 7+ years of software engineering experience Strong background in backend development, distributed systems, and scalable architecture Proficiency in modern backend technologies such as C#, .NET, Java, or Python Strong understanding of data structures, algorithms, and object-oriented design Experience building and consuming REST APIs Hands-on experience with React or modern UI frameworks Experience with relational and NoSQL databases (e.g., SQL Server, PostgreSQL, MySQL, MongoDB) Strong knowledge of CI/CD pipelines and Git-based workflows Experience with cloud-native development in AWS or Azure Understanding of software security principles and OWASP guidelines Experience writing unit tests and maintaining high test coverage Familiarity with Agile development methodologies Proven ability to deliver complex projects on timeCloud, DevOps & Infrastructure Experience with cloud services (AWS or Azure), including IAM, compute, storage, and API services Familiarity with containerization using Docker and orchestration using Kubernetes Exposure to CI/CD tools such as GitHub Actions, GitLab CI, or Jenkins Basic understanding of Infrastructure-as-Code (Terraform preferred) Familiarity with observability tools (Prometheus, Grafana, CloudWatch, Azure Monitor)AI, Agentic Systems & Emerging Technologies Familiarity with LLM concepts and frameworks such as LangChain, LlamaIndex, LangGraph, or CrewAI Exposure to Retrieval-Augmented Generation (RAG) and interest in evolving toward Agentic RAG systems Understanding of agentic workflows including tool use (function calling) and state management Awareness of vector databases (e.g., Pinecone, Milvus) and semantic search concepts Interest 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 & Collaboration Bachelor's degree in Computer Science, Software Engineering, or related field Strong collaboration skills in agile, cross-functional, and distributed teams Ability to communicate technical concepts and trade-offs clearly to both technical and non-technical stakeholders Proven ability to work effectively in geographically distributed teams Self-driven, proactive, and highly accountable for deliverables Continuous learner with strong interest in evolving cloud and AI technologiesTechnology Must-Haves C# / .NET (or equivalent backend language such as Java or Python) React

REST API

development (ASP.NET or equivalent frameworks) Docker Kubernetes SQL & NoSQL databases Cloud platforms (AWS / Azure) CI/CD pipelines Event-driven architectureNice to Have / Learn Quickly Terraform Helm / ArgoCD GitHub Actions GraphQL Kafka Azure advanced services The base pay range represents the anticipated low and high end of the pay range for this position. Actual pay rates will vary... For full info follow application link. Equal Opportunity Employer/Vets/Disability To view full details and how to apply, please login or create a Job Seeker account