Senior .NET Developer

Job#: 3031370

Job Description:
Job Responsibilities:

Application and Solution Development: Design, develop, and maintain complex enterprise applications using ASP.NET MVC 5 (Windows), C#, .NET Framework 4.8, SOAP and REST APIs, and modern web technologies. Maintain older ASP.NET (Web Forms) applications, Microsoft RDLC and Crystal Reports.

Full Stack Development including Frontend Development and maintenance: HTML5, CSS3, JavaScript including ECMAScript 5/6, asynchronous operations and adherence to WCAG 2.1 and modern web development standards.

Database Development and Modeling: Create and maintain database schemas, stored procedures, and data access layers. Implement business rules, validation, and data integrity controls across Oracle 19c or similar relational systems.

Solution Lifecycle Management: Participate in all phases of the application lifecycle, from requirements gathering and design to development, testing, deployment, and maintenance. Utilize source control and follow best practices for deploying solutions across development, testing, and production environments.

Support and Troubleshooting: Providing technical support to users (both business and technical), troubleshooting with apps, databases, resolve performance problems, and address security concerns.

Collaboration and Communication: Work directly with business stakeholders, communicate effectively with technical teams, and assist end-users. Demonstrates strong customer service awareness and orientation.

Ongoing Support: Provide ongoing support for MDOT users by maintaining and enhancing existing .NET applications. Demonstrate flexibility to support multiple legacy applications and shift between systems as project needs evolve

Required Qualifications:

8+ years of extensive .NET Development experience: Proven experience designing and building complex applications using C#, ASP.NET Web Forms/MVC (Framework 4.8) and ASP.NET MVC 5 (Windows) ASP.NET (Web Forms, common architectural patterns, and API design.

6+ years of Database Engineering Expertise experience: Experience modeling relational databases, creating schemas, and optimizing queries. Able to manage roles, security, and data quality in an enterprise Oracle 19c environment. Strong Oracle SQL and PL/SQL using Toad/OSD

6+ years of Frontend Development experience: Demonstrated background in HTML5, CSS3, JavaScript including ECMAScript 5/6, asynchronous operations and adherence to WCAG 2.1 and modern web development standards.

4+ years of Backend Services and Integrations experience: Strong understanding of web service design, authentication and authorization mechanisms including authentication flows (OAuth2/OIDC), secure API integration, and robust error handling patterns.

Troubleshooting and problem-solving; including the ability to diagnose and resolve complex technical issues utilizing strong analytical and problem-solving skills.

Strong written and verbal communication; discussing application errors with users and other technical staff, describing technology to diverse user groups, preparing documentation.

Preferred Qualifications

Experience creating custom .NET libraries, reusable components, integration connectors, or using PowerShell for automation tasks.

Experience with ASP.NET Core, understanding of reusable components, dependency injection, and modern frontend technologies like Blazor.

EEO Employer

Apex Systems is an equal opportunity employer. We do not discriminate or allow discrimination on the basis of race, color, religion, creed, sex (including pregnancy, childbirth, breastfeeding, or related medical conditions), age, sexual orientation, gender identity, national origin, ancestry, citizenship, genetic information, registered domestic partner status, marital status, disability, status as a crime victim, protected veteran status, political affiliation, union membership, or any other characteristic protected by law. Apex will consider qualified applicants with criminal histories in a manner consistent with the requirements of applicable law. If you have visited our website in search of information on employment opportunities or to apply for a position, and you require an accommodation in using our website for a search or application, please contact our Employee Services Department at or .

Apex Systems is a world-class IT services company that serves thousands of clients across the globe. When you join Apex, you become part of a team that values innovation, collaboration, and continuous learning. We offer quality career resources, training, certifications, development opportunities, and a comprehensive benefits package. Our commitment to excellence is reflected in many awards, including ClearlyRated's Best of Staffing in Talent Satisfaction in the United States and Great Place to Work in the United Kingdom and Mexico. Apex uses a virtual recruiter as part of the application process. Click for more details.

Apex Benefits Overview: Apex offers a range of supplemental benefits, including medical, dental, vision, life, disability, and other insurance plans that offer an optional layer of financial protection. We offer an ESPP (employee stock purchase program) and a 401K program which allows you to contribute typically within 30 days of starting, with a company match after 12 months of tenure. Apex also offers a HSA (Health Savings Account on the HDHP plan), a SupportLinc Employee Assistance Program (EAP) with up to 8 free counseling sessions, a corporate discount savings program and other discounts. In terms of professional development, Apex hosts an on-demand training program, provides access to certification prep and a library of technical and leadership courses/books/seminars once you have 6+ months of tenure, and certification discounts and other perks to associations that include CompTIA and IIBA. Apex has a dedicated customer service team for our Consultants that can address questions around benefits and other resources, as well as a certified Career Coach. You can access a full list of our benefits, programs, support teams and resources within our 'Welcome Packet' as well, which an Apex team member can provide.