Senior Software Engineer (C#/.NET & AI)
WEX · Dallas, TX
- On site
- Full-time
- $133,250 / year
- Dallas, TX
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Senior Software Engineer (C#/.NET & AI)
WEX · Dallas, TX
Casey Reed
Hiring Manager · h•••••@careers.wexinc.com
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Subject: Interested in the Senior Software Engineer (C#/.NET & AI) role at WEX
Hi Casey — I came across the Senior Software Engineer (C#/.NET & AI) opening and wanted to reach out directly. I've spent the last few years doing exactly this kind of work, and WEX stood out because…
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Not recommended alone — most applicants never hear back.
Job highlights
- Design and build next-gen benefits platforms.
- Develop scalable, secure, high-quality solutions.
- Work with C#, .NET, AI, and cloud.
- Collaborate with cross-functional teams.
- Mentor peers and drive technical excellence.
About the role
Senior Software Engineer C# .NET AI
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 supervision
Experience You’ll Bring
Software 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 time
Cloud, 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 pipelines
Leadership & 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 technologies
Technology 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 architecture
Nice to Have / Learn Quickly
- Terraform
- Helm / ArgoCD
- GitHub Actions
- GraphQL
- Kafka
- Azure advanced services
Key Skills/Competency
- Senior Software Engineer C# .NET AI
- Backend Development
- Distributed Systems
- Scalable Architecture
- C# .NET
- AWS or Azure
- CI/CD
- Microservices
- Event-Driven Architecture
- LLM Concepts
Skills & topics
- Senior Software Engineer
- C#
- .NET
- AI
- Backend Development
- Distributed Systems
- Scalable Architecture
- Cloud Native
- AWS
- Azure
- Microservices
- Event-Driven Architecture
- LLM
- React
- Kubernetes
- Docker
- CI/CD
- Agile
How to get hired
- Tailor your resume: Highlight your 7+ years of software engineering experience, focusing on C#/.NET, distributed systems, cloud platforms (AWS/Azure), and AI/LLM concepts.
- Showcase AI/LLM knowledge: Emphasize any experience with LLM frameworks like LangChain, RAG, vector databases, or agentic workflows to align with emerging technologies.
- Demonstrate cloud and DevOps skills: Detail your proficiency with Docker, Kubernetes, CI/CD pipelines, and cloud-native development (AWS/Azure) as these are critical.
- Prepare for technical interviews: Be ready to discuss data structures, algorithms, object-oriented design, RESTful APIs, and system design principles, particularly in a C#/.NET context.
- Highlight collaboration and leadership: Share examples of mentoring peers, communicating technical trade-offs, and working effectively in distributed agile teams.
Technical preparation
Master C#/.NET fundamentals and advanced features.,Practice building and consuming REST APIs.,Study Docker and Kubernetes for containerization.,Review AI/LLM concepts and frameworks.
Behavioral questions
Describe a complex technical challenge you solved.,How do you mentor junior engineers effectively?,Share an example of influencing technical direction.,How do you handle production incidents and improvements?
Prefer to apply the usual way?
Not recommended alone — most applicants never hear back. Email the hiring manager first.
Frequently asked questions
- What are the specific locations for the Senior Software Engineer (C#/.NET & AI) role at WEX?
- The Senior Software Engineer (C#/.NET & AI) role at WEX is open only to candidates located in Chicago, IL; Dallas, TX; New York City, NY; Boston, MA; or Portland, ME.
- Does WEX offer immigration sponsorship for this Senior Software Engineer role?
- No, WEX is currently unable to provide immigration sponsorship or support for this role, either now or in the future.
- What are the primary responsibilities for a Senior Software Engineer at WEX?
- As a Senior Software Engineer at WEX, you will partner with Product Managers and stakeholders to design, build, test, and deploy scalable software solutions, focusing on microservices, event-driven architectures, and modern engineering practices, including AI and cloud technologies.
- What are the must-have technical skills for the Senior Software Engineer (C#/.NET & AI) position?
- The must-have technical skills include C#/.NET (or Java/Python), React, REST API development, Docker, Kubernetes, SQL & NoSQL databases, cloud platforms (AWS/Azure), CI/CD pipelines, and event-driven architecture.
- What experience is expected for the AI/Agentic Systems aspect of this role?
- Familiarity with LLM concepts and frameworks (e.g., LangChain), Retrieval-Augmented Generation (RAG), agentic workflows, vector databases, and AI-native feature development is expected or a strong interest in learning these is highly valued.
- What is the minimum software engineering experience required for this Senior Software Engineer role at WEX?
- The Senior Software Engineer role at WEX requires a minimum of 7+ years of software engineering experience, with a strong background in backend development, distributed systems, and scalable architecture.
- How does WEX approach mentorship and continuous learning for its engineers?
- WEX encourages Senior Software Engineers to mentor peers and contribute to a culture of technical excellence and continuous learning, with a strong interest in evolving cloud and AI technologies.
- What is the base pay range for the Senior Software Engineer (C#/.NET & AI) position at WEX?
- The base pay range for this position at WEX is $121,500.00 to $145,500.00 per year, with actual pay determined by qualifications, skills, and experience.
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