Software Engineer, Level III

Clear Creek Federal is part of the Seneca Nation Group (SNG) portfolio of companies. SNG is Seneca Holdings' federal government contracting business that meets mission-critical needs of federal civilian, defense, and intelligence community customers. Our portfolio comprises multiple subsidiaries that participate in the Small Business Administration 8(a) program. To learn more about SNG, visitthe website and follow us onLinkedIn.

Our team of talented individuals is what makes us successful. To support our team, we provide a balanced mix of benefits and programs.Your total rewards package includes competitive pay, benefits, and perks, flexible work-life balance, professional development opportunities, and performance and recognition programs. We offer a comprehensive benefits package that includes medical, dental, vision, life, and disability, voluntary benefit programs (critical illness, hospital, and accident), health savings and flexible spending accounts, and retirement 401K plan. One of our fundamental principles is to offer competitive health and welfare benefits to our team members, providing coverage and care for you and your family. Full-time employees working at least 30 hours a week on a regular basis are eligible to participate in our benefits and paid leave programs. We pride ourselves on our collaborative work environment and culture, which embraces our mission of providing financial and non-financial benefits back to the members of the Seneca Nation.

The U.S. Army Communications-Electronics Command (CECOM) Software Engineering Center, Intelligence Electromagnetic Warfare and Sensors (IEW&S) Directorate, operates the Army Reprogramming Analysis Team (ARAT) at Aberdeen Proving Ground. ARAT builds, tests, and distributes mission software for fielded electromagnetic warfare systems, including the AN/APR-39 radar warning receiver family, the AN/APR-48A/B Modernized Radar Frequency Interferometer, the Aircraft Gateway Processor on the AH-64, and the AN/VLQ-12 CREW Duke. ARAT targets its mission software products to 14 geographic areas of responsibility across six combatant commands.

The ARAT Innovation Initiatives effort modernizes that infrastructure: browser-based threat modeling in the Signal Modeling Framework, automated RF hardware-in-the-loop testing through the Unified Test Automation Suite and software-defined radios, an automated Air/Terrestrial Testbed, test data warehousing, automated mission data product generation, and the ASPEN software distribution portal across NIPR, SIPR, and JWICS. Work is executed in Agile sprints with DevSecOps practices in a Government-approved GitLab environment.

The Level III Software Engineer sets technical direction for assigned ARAT product baselines and leads integration of software into the classified APG laboratory where test software executes on a Windows Army Gold Master build. The role resolves cross-baseline architectural issues across SMF, UTAS, and ASPEN and ensures the contractor development environment stays compatible with the ARAT APG lab environment. It reviews the work of junior engineers and is accountable for the technical quality of delivered installation packages. The role also owns user-interface architecture across the SMF, TestNet, and ASPEN products, establishing the shared component library, interaction patterns, and accessibility standard the three browser-based interfaces inherit. The role is the contractor's senior technical authority across the entire delivery chain. It owns the secure delivery pipeline into the classified ARAT APG laboratory, leads ARAT-ICS coordination for the information assurance approval that gates every delivery under 4.2.7.2, and sets the STIG compliance and pipeline security standard the development teams inherit. It owns the architecture of the ARAT test data baseline and sets the analytics and model validation strategy for ASPEN. It also sets the cloud and network security architecture for ARAT enterprise services, defining the hosting, segmentation, and identity model that lets the ASPEN portal operate across NIPR, SIPR, and JWICS, and advises the Government on cloud investment and cross-domain distribution.

• Set technical direction for assigned ARAT product baselines and lead integration of software into the classified APG laboratory where test software executes on a current Windows Army Gold Master build.
• Resolve cross-baseline architectural issues across SMF, UTAS, and ASPEN.
• Keep the contractor development environment compatible with the ARAT APG laboratory environment.
• Own user-interface architecture across the SMF, TestNet, and ASPEN products, establishing the shared component library, interaction patterns, and accessibility standard the three browser-based interfaces inherit.
• Review the work of junior engineers and carry accountability for the technical quality of delivered installation packages.

• Own the secure delivery pipeline into the classified ARAT APG laboratory, where test software executes on the current Windows Army Gold Master build.
• Lead ARAT-ICS coordination for the information assurance approval that gates every delivery.
• Set the STIG compliance and pipeline security standard the development teams inherit.
• Carry accountability for the contractor's ability to deliver software into the classified environment on schedule.
• Design cross-domain delivery practices and harden the Windows Army Gold Master build for ARAT use.

• Own the architecture of the ARAT test data baseline, defining how test data is collected, modeled, archived, and served across the enterprise.
• Design for the exponential growth in test volume driven by modern EW threats and systems, and establish the data contracts that signals analysis and analytics workloads depend on.
• Set the analytics strategy for ASPEN, including the modeling approach for suggestive analytics and search relevance.
• Define model validation standards appropriate to a Government system used by operational EW units.
• Advise the Government on data platform investment and cross-domain data movement across NIPR, SIPR, and JWICS.

• Set the cloud and network security architecture for ARAT enterprise services, principally the ASPEN portal that must operate across NIPR, SIPR, and JWICS under PWS 4.2.6.
• Define the hosting, segmentation, and identity model that satisfies ARAT-ICS security requirements while meeting the portal's growth demands.
• Advise the Government on cloud investment, cross-domain distribution, and the security architecture implications of the ASPEN optimization objectives.
• Establish security architecture governance and RMF control inheritance for hosted ARAT services.
• Perform cost and capacity optimization across hybrid on-premises and cloud environments.

• Bachelor's degree in engineering, computer science, or a related technical discipline.
• 9 or more years of relevant professional experience in software engineering.
• Active DoD Secret clearance at time of application.
• Position-specific training beyond the common set: Derivative Classification (every 2 years) if the engineer derivatively classifies and RF EMF hazard awareness for classified lab access. Derivative Classification where the engineer handles classified test data or trains models on classified data.
• Ability to work on-site at Aberdeen Proving Ground, Maryland on a hybrid schedule, with on-site presence required for classified and laboratory work.

• CompTIA Security+ CE, or CompTIA SecurityX (formerly CASP+ CE) or ISC2 CISSP at the senior level.
• AWS Certified Solutions Architect - Associate.
• Certified Scrum Developer.
• IAAP Web Accessibility Specialist (WAS) (front-end scope).
• AWS Certified DevOps Engineer - Professional.
• Databricks Certified Data Engineer Professional.
• AWS Certified Data Engineer.
• AWS Certified Machine Learning Engineer - Associate (the ML - Specialty exam retired 31 Mar 2026).
• SnowPro Advanced Architect.
• INFORMS Certified Analytics Professional (CAP).
• ISC2 CCSP.
• AWS Certified Solutions Architect - Professional.
• Azure Solutions Architect Expert (AZ-305).
• Experience deploying software into a classified enclave under an information assurance approval gate.
• Experience establishing a design system or shared component library across multiple products.
• Experience operating a classified CI/CD pipeline under an Authority to Operate.
• Master's degree in data science, computer science, statistics, or a related discipline.
• Experience architecting a data platform spanning multiple security domains.
• Experience designing to the DoD Cloud Computing SRG and a zero trust reference architecture.

C#, or Python development; Agile/Scrum delivery; GitLab CI/CD pipelines; REST API design; unit and integration testing; STIG-compliant secure coding; Windows Army Gold Master (AGM) target environment; software installation package assembly (source, executables, Build Version Description, Help); System User's Manual authoring; software architecture; classified enclave deployment; Windows AGM compatibility engineering; technical leadership and code review; cross-baseline integration; front-end architecture in a modern JavaScript framework (Angular); design system and component library governance; Section 508 / WCAG 2.1 AA conformance; usability testing; cross-product interaction design; front-end performance optimization.

GitLab CI/CD pipeline design; container: STIG remediation and hardening; SCAP scanning; secrets and artifact management; RMF/eMASS artifact production; Linux and Windows Server administration; DevSecOps toolchain integration; classified pipeline architecture; Windows AGM hardening; IA approval workflow ownership; cross-domain delivery; team technical leadership.

SQL and relational data modeling; ETL/ELT pipeline construction; data lake and data warehouse architecture; time-series and telemetry data at volume; Python or Scala for data engineering; data cataloging and lineage; schema evolution management; archival and retrieval design for test data; data platform architecture; cross-domain data movement; data governance; capacity and growth planning; statistical modeling and inference; machine learning model development and evaluation; recommender and suggestive analytics systems; natural language processing for chatbot and search; Python (scikit-learn, PyTorch or TensorFlow); feature engineering on telemetry and test data; model validation and explainability; results communication to non-specialist stakeholders; analytics strategy; model validation standards; MLOps; technical mentoring; Government advisory.

Vendor and tool training that carries weight: GitLab CI/CD; Windows Army Gold Master administration; DISA STIG and SCAP tooling; architecture modeling tools; Angular; design system tooling (Storybook); Figma; front-end performance profiling tools; Classified pipeline design; Windows Army Gold Master hardening; eMASS; cross-domain delivery practice; Red Hat RHCE; Spark and Delta Lake architecture; Kafka; data mesh/lakehouse patterns; cross-domain (NIPR/SIPR/JWICS) data movement practices; advanced Python ML; MLOps pipelines in GitLab; model risk and validation practice; Multi-domain (NIPR/SIPR/JWICS) architecture; DoD Cloud Computing SRG; zero trust reference architecture; cross-domain solution patterns.

• An active DoD clearance at the level shown above is required. Secret is the floor across this contract.
• A signed non-disclosure agreement is required before start of performance.
• Common Access Card issuance runs approximately 24 hours; full network and facility access typically takes three to four business days after in-processing.
• Every position carries the universal DoD and Army training set, completed at start of performance and refreshed on the Army cycle: DoD Cyber Awareness Challenge, Threat Awareness and Reporting Program (TARP), annual security refresher, insider threat awareness, controlled unclassified information handling, Antiterrorism Level I, iWATCH briefing, ATCTS registration, and installation access processing.