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WEX

Senior Software Engineer, C#/.NET, AI

WEX

. Partner with Product and stakeholders to understand customer challenges and translate them into technical solutions .

Posted 5/1/2026full-timeChicago • Illinois, Maine, Massachusetts, New York, Texas • 🇺🇸 United StatesSenior💰 $121,500 - $145,500 per yearWebsite

Tech Stack

Tools & technologies
AWSAzureCloudDistributed SystemsJavaMicroservicesMongoDBMySQL.NETNoSQLPostgresPythonReactSQL

About the role

Key responsibilities & 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

Requirements

What you’ll need
  • 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
  • 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

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
C#.NETJavaPythonREST APIsmicroservicesevent-driven architectureCI/CDdata structuresalgorithms
Soft Skills
collaborationcommunicationmentoringownershipindependenceproactivityaccountabilitycontinuous learningtechnical excellenceproblem-solving
Certifications
Bachelor’s degree in Computer ScienceBachelor’s degree in Software Engineering