Senior .NET Developer / Architect - Contingent

Aretum•Washington, DC

About The Position

This is a contingent position, meaning employment is dependent upon the successful award of the associated contract to Aretum and completion of any required background investigation or security clearance verification. About Aretum Aretum is a mission-driven organization committed to delivering innovative, technology-enabled solutions to our customers across defense, civilian, and homeland security sectors. Our teams work at the intersection of strategy, technology, and transformation, helping agencies solve their most critical challenges. We believe in investing in our people and creating a culture where collaboration, inclusion, and professional growth are at the forefront. Job Summary The Senior .NET Developer / Architect will lead the design, development, modernization, and technical sustainment of a mission-critical federal information system and its associated sub-applications. This role is responsible for ensuring that application enhancements, system integrations, and new development efforts are implemented in accordance with approved technical requirements, configuration management standards, and federal security and accessibility policies. The Senior .NET Developer / Architect provides technical leadership across the full software development life cycle (SDLC), including translation, coding, testing, deployment, and operational support within continuous integration, test, and production environments. All work is performed within client-approved secure environments and in compliance with federal security, IT governance, and documentation standards. Due to the nature of our work as a federal consulting organization, employees may be expected to handle Controlled Unclassified Information (CUI) and must adhere to applicable safeguarding and compliance requirements.

Requirements

Active Top Secret clearance.
Minimum of 8 years of experience in .NET application development and enterprise system architecture.
Bachelor’s Degree (4 additional years of experience acceptable in lieu of a degree).
Demonstrated experience supporting mission-critical or enterprise-scale information systems within a regulated federal environment.
Strong technical documentation skills and attention to detail.
Ability to collaborate effectively with project managers, system administrators, database administrators, and government stakeholders.
Strong analytical, problem-solving, and communication skills.

Nice To Haves

Master’s degree.
Experience designing and developing Online Transaction Processing (OLTP) systems or similar transactional platforms.
Experience supporting full SDLC activities, including requirements analysis, coding, testing, deployment, and operational support.
Working knowledge of configuration management, version control, and change control processes.
Experience performing software testing, including regression testing and production release validation.
Experience supporting application integration and data migration activities.
Familiarity with federal information system documentation requirements, including SDDs, SRS, and traceability matrices.
Knowledge of Section 508 accessibility requirements for electronic and information technology (EIT) systems.

Responsibilities

Leading the design and development of .NET-based application components supporting an enterprise federal information system and its sub-applications.
Translating business and customer requirements into technical designs and system architectures.
Supporting and modernizing Online Transaction Processing (OLTP) system components, reporting functions, and invoicing/payment functionalities.
Implementing and supporting application enhancements across continuous integration, test, and production environments.
Supporting data migration activities, including unifying application and database development frameworks and migrating development, test, and production environments.
Designing and implementing application integrations, including scheduling functionality and system-to-system data exchanges.
Ensuring all software modifications are documented and coordinated in accordance with configuration management, version control, and change control standards.
Participating in Change Control Board (CCB) activities and supporting the technical analysis of approved change requests, including providing level-of-effort (LOE) estimates.
Performing and supporting software testing activities, including unit testing, integration testing, regression testing, and production release validation.
Ensuring all software promoted to production is fully tested and vetted prior to deployment.
Ensuring that developed applications comply with Section 508 accessibility requirements.
Maintaining software documentation, including source code documentation, user guides, and technical design artifacts.
Supporting the development of Software Design Documents (SDDs), System Requirements Specifications (SRS), and traceability matrices.
Providing technical input into application architecture decisions, development standards, and innovation initiatives.
Developing technical recommendations and white papers related to system enhancements and modernization opportunities.
Supporting user acceptance testing (UAT) activities in coordination with subject matter experts and program leadership.
Coordinating with system administrators and database administrators to ensure application compatibility with production environments.
Supporting operational maintenance activities, bug fixes, and reliability improvements for existing application components.