.Net/F# Developer

Job#: 3044661 Job Description: Position: Senior .NET / F# Developer Location: Chicago IL or Denver CO Schedule: Onsite 5x per week Duration: Up to 18 month contract, potential to convert to full time Must be authorized to work in the United States without sponsorship now or in the future. Job Description This role is responsible for developing and delivering complex requirements to accomplish business goals. Key responsibilities of the role include ensuring that software is developed to meet functional, non-functional, and compliance requirements. This role ensures solutions are well designed with maintainability/ease of integration and testing built-in from the outset. These individuals possess strong proficiency in development and testing practices common to the industry and have extensive experience of using design and architectural patterns. This role will require becoming deeply familiar with Jira Service Management functionality in order to build bidirectional API and Event/Messaging based systems integrations. Responsibilities Contribute to story refinement/defining requirements Perform spike/proof of concept as necessary to mitigate risk or implement new ideas Code solutions and unit test to deliver a requirement/story per the defined acceptance criteria and compliance requirements Utilize multiple architectural components (across data, application, business) in design and development of client requirements Assist team with resolving technical complexities involved in realizing story work Design/develop/modify architecture components, application interfaces, and solution enablers while ensuring principal architecture integrity is maintained Design/develop/maintain automated test suites (integration, regression, performance) Mandatory Skills Previous Application Programming/Development experience designing, developing, and deploying scalable, high-volume, multi-tiered, distributed transactional applications Deep knowledge designing and implementing RESTful Web APIs on recent .NET and/or .NET Framework versions Deep knowledge designing and implementing Event Based integration services using Message Brokers such as Kafka, RabbitMQ, etc. Understanding of Functional Programming, Domain Driven Design, and Consumer Driven Contracts, Clean Architecture, CQRS Proficient with API instrumentation, resiliency, caching, modularity Proficient with API Security Frameworks (oAuth, JWT, etc.) Proficient with API documentation tools (Swagger or similar) Strong understanding of unit testing frameworks, TDD, CI, IoC Strong knowledge of SQL Server databases Deep understanding of Git version control system Experience working in Agile development process and good understanding of various phases of Software Development Lifecycle Experience in data access technologies and patterns Ability to communicate, written and verbal, with technical and non-technical cross-functional teams Desired Skills Any F# experience Recent Angular Experience Jira/Jira Service Management Workflow Configuration and API Integrations Knowledge of software development lifecycle; preferably with Agile, Kanban/Scrum Experience with cyber security related workflows/solutions/implementation Experience working in cross-platform (Windows and Linux) command line environments 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 [email protected] or 844-463-617 Everforth Apex is a world-class IT services company that serves thousands of clients across the globe. When you join Everforth 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 ClearlyRateds Best of Staffing® in Talent Satisfaction in the United States and Great Place to Work® in the United Kingdom and Mexico. Everforth Apex uses a virtual recruiter as part of the application process. Click here for more details. By applying for this job, you agree to receive calls, AI-generated calls, text messages, or emails from Everforth Apex and its affiliates, and contracted partners. Frequency varies for text messages. Message and data rates may apply. Carriers are not liable for delayed or undelivered messages. You can reply STOP to cancel and HELP for help. You can access our privacy policy at https://www.apexsystems.com/privacy-policy Everforth Apex Benefits Overview: Everforth 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. Everforth 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, Everforth 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. Everforth 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 Everforth Apex team member can provide. Everforth 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. Everforth Apex will consider qualified applicants with criminal histories in a manner consistent with the requirements of applicable law. If you require an accommodation under the Americans with Disabilities Act to participate in an interview with a virtual recruiter or to use our website for a search or application, please contact our Benefits Department at [email protected] or 804-523-8228. Please note that this contact information is strictly to be used for medical ADA accommodations and that no other inquiries will be answered. UnitedHealthcare creates and publishes the Transparency in Coverage Machine-Readable Files on behalf of Everforth Apex Systems. © 2026 Everforth, Inc. All rights reserved. Everforth Apex Systems is part of the Commercial Segment of Everforth, Inc. NYSE: EFOR 4400 Cox Road Suite 200 Glen Allen, Virginia 23060 Everforth Apex 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. Everforth 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 Benefits Department at [email protected] or 804-523-8228. (Do not submit resumes or solicit consultants to this email address). UnitedHealthcare creates and publishes the Transparency in Coverage Machine-Readable Files on behalf of Everforth Apex.