Senior Software Engineer

WEX Inc.; Minnesota; Hybrid; USD 122,000 - 146,000; Full time

Benefits offered by this job

Health insurance

Dental insurance

Vision insurance

Retirement savings plan

Paid time off

Health savings account

Flexible spending accounts

Life insurance

Disability insurance

Tuition reimbursement

Job summary

WEX Inc. is seeking a senior software engineer skilled in C# and ASP.NET MVC to design, build, and maintain scalable applications.

You will work across the full software lifecycle, write testable code, and participate in architecture discussions to ensure maintainability and performance. You will collaborate with architects, QA, and product teams, contribute to code reviews, and assist in deployments, including after-hours support when needed.

Qualifications

• 6+ years of strong C# and ASP.NET MVC skills.
• SQL proficiency.
• Hands on experience with automated testing tools to assist with unit testing.

Responsibilities

• Collaborate on design and delivery decisions within the team and with Architects.
• Participate in code reviews and ensure implementations meet goals and standards.
• Contribute to the deployment lifecycle and post-deployment validation.

Skills

C#

ASP.NET MVC

SQL

DevOps

Education

Bachelor’s degree in computer science or related field

Job description

What you will do

Team Collaboration Support applications both during and outside business hours. Research issues and Service Requests quickly and efficiently. Engage in discussions and propose solutions. Support production deployments, which occur on evenings and weekends. Contribute to post-deployment application validation. Quickly troubleshoot, evaluate, and resolve any issues that arise. Participate in and lead team meetings and feature discussions.

Software Design and Architecture

Create basic designs for new and existing features. Develop solutions that can be performant, scalable, consistent, and supportable that can be accomplished within the available scope, time, and budget. Participate in code reviews within the team and across other teams to ensure implementations adhere to goals, standards, and best practices. Deliver software that meets requirements by learning the product area to provide the best long-term solutions. Write code that is testable at all levels (unit, integration, and end-to-end.) Assist in increasing unit test coverage. Review requirements and provide meaningful and timely feedback to improve them. Ask questions to ensure requirements are feasible, implementation is efficient, and the design is aligned with the technical direction set by your team and Architects. Participate in estimation and prioritization of project requests. Establish relationships with Architects, Software Engineers, Quality Assurance Engineers and Business Analysts to collaborate on design and delivery decisions.

Project Implementation

Contribute to the prioritization of performance improvements and technical debt. Understand common security vulnerabilities and best practices defined by Architects to reduce risk of security threats. Design and develop technical solutions in all environments, resulting in an increased level of throughput. Others use your code as an example to learn from.

Product Proficiency

Understand your team’s product domain and act as an internal subject matter expert. Basic knowledge of multiple product domains. Able to discuss application behavior and technology outside of the Development department in both a technical and business communication style.

AI-Based Development

Spec-Driven Development (GitHub SpecKit): Utilize GitHub SpecKit framework (constitution rules, spec/plan/task workflows) to transition from ad-hoc coding to structured, agentic AI workflows. Define clear non-negotiable architectural principles, system boundaries, and clear specifications prior to automated code execution. Model Selection & Architecture Alignment: Strategically select and evaluate optimal AI models (e.g., Claude Code, OpenAI o-series/GPT-4o, GitHub Copilot) based on task complexity, context window constraints, latency, and reasoning requirements. Model Context Protocol (MCP) Integration: Leverage and configure Model Context Protocol (MCP) servers to grant AI agents secure, context-aware access to enterprise databases, internal APIs, and developer tools without exposing sensitive corporate data. Continuous AI Skill Development & Upskilling: Drive personal AI proficiency and lead team-wide upskilling initiatives on emerging AI capabilities, modern prompt engineering patterns, and agentic development workflows. Prompt Engineering for Code & Quality: Formulate precise technical prompts to auto-generate high-coverage unit/integration/E2E tests, C# boilerplate, and SQL scripts adhering strictly to WEX architectural standards. Code Refactoring & Technical Debt Reduction: Utilize AI tools to analyze legacy C# and SQL codebases, identifying performance bottlenecks, security vulnerabilities (OWASP top 10), and opportunities for modern refactoring. AI Governance & Code Review Standards: Serve as a technical gatekeeper for AI-generated code—ensuring all agentic outputs undergo rigorous code reviews, automated security scanning, and manual validation for performance, scalability, and long-term maintainability.

Leadership

Help others complete tasks to accomplish goals. Step into other roles to ensure project deadlines are met. Serve as a mentor with an ability to onboard new Software Engineers ensuring they have the proper tools and knowledge to become productive quickly. Participate in the interview process and provide valuable hiring recommendations. Provide technical and domain guidance to internal and external team members. Lead features or components through the full software deployment lifecycle, including integration, customer feedback, release, and support phases. Recommend ways to distribute work across your team to increase development efficiency. Perform effectively in a cross-functional team environment to ensure successful execution and delivery of project commitments. Demonstrate expertise in a domain as evidenced by others seeking your peer reviews, advice, and problem solving. Communicate priorities and dependencies across teams to ensure successful execution and delivery of commitments. Build relationships with Business Analysts, Quality Assurance Engineers, Architects, Product Owners, Support, Management, Configuration Management, Database Administrators, etc.

What you will bring to the table

6+ years of strong C# and ASP.NET MVC skills, SQL proficiency, DevOps. Bachelor’s degree in computer science or related field Experience with tools and programming languages defined by Development Managers specific to their teams Strong knowledge in Software Development Fundamentals and Process, Design, Documentation, Testing, and tools Effective in distributed team environment Strong oral and written communication skills Hands on experience with automated testing tools to assist with unit testing Hands on experience with Devops and Infrastructure as Code.

The 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. Pay Range: $121,500.00 - $145,500.00 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.

WEX is a global commerce platform that helps businesses solve for operational complexities like employee benefits, managing and mobilizing fleets, and streamlining payments. With over 6,500 employees, we work with large and small companies in more than 200 countries and territories, and can tailor our services to meet the unique needs of their businesses. We hire people who share our passion for continuous innovation and client service that is unparalleled in the industry. Offering comprehensive and market competitive benefits, our offerings are designed to support your personal and professional well-being. If you’re looking for a growing career - come be part of WEX today. To learn more about our employee benefits, please click here. WEX is an equal opportunity employer committed to diversity and inclusion in the workplace. All qualified applicants will receive consideration for employment without regard to sex, race, color, age, national origin, religion, sexual orientation, gender identity, protected veteran status, disability or other protected status. WEX promotes a drug-free workplace. Qualified individuals with a disability have the right to request a reasonable accommodation. If you require a reasonable accommodation as a result of your disability at any point in the job application process, please submit your request through our Reasonable Accommodation Request Form. This form is for accommodation requests only and cannot be used to inquire about the status of applications.