Senior Back-End / Platform Engineer
American Systems · Alexandria, VA, US
About this role
**Senior Back-End / Platform Engineer** **Overview** AMERICAN SYSTEMS is an employee-owned federal government contractor supporting national priority programs through strategic solutions in **Information Technology, Engineering & Analysis, Test & Evaluation, and Training**. **Responsibilities** - Design, build, migrate, and sustain **DTE&A Data Management Platform (DDMP)** secure domain services, data-access layer, integration APIs, workflow automation, and **AI-enabled back-end** capabilities. - Lead modernization of existing **DDMP Python/Flask** services and legacy **MySQL/MongoDB** data into **secure, scalable cloud-native** services. - Design and implement business APIs for assessments, evaluation, findings, recommendations, reconciliation threads, reports, artifacts, and approval history. - Build secure, observable integrations with enterprise data sources, program-management systems, **SharePoint**, telemetry streams, and analytics platforms. - Develop data-ingestion, transformation, validation, and reconciliation services that preserve **data integrity and provenance**. - Implement workflow automation and AI-assisted capabilities while ensuring analysts remain the accountable authority for official findings and scores. - Establish **API standards**, coding standards, data-quality controls, service-level objectives, and technical documentation. - Partner with security and cloud engineering staff to remediate vulnerabilities, implement secure configurations, and generate **ATO evidence**. **Qualifications** - **BS** and **TS/SCI eligible** with **11+ years** of professional back-end software engineering experience, including **3+ years** delivering cloud-native, distributed, or microservices-based applications. - CSP credentials such as **AWS Certified Developer**, **Microsoft Azure Developer Associate**, **Google Professional Cloud Developer** (or comparable). - **Certified Kubernetes Application Developer (CKAD)** (or equivalent practical Kubernetes expertise). - **Security+** (or equivalent). - Expert-level **Python** experience with modern API/service frameworks such as **FastAPI, Flask, Django** (or equivalent). - Experience decomposing a monolithic Flask application into modular services without disrupting active users or data integrity. - Experience designing **domain-driven systems** and workflow engines for complex, auditable business processes. - Knowledge of API gateway patterns, API versioning, throttling, idempotency, **OpenAPI**, **OAuth/OIDC** token validation, and service-to-service authentication. - Experience with **Change Data Capture (CDC)**, database replication, data quality controls, lineage, and data reconciliation. - Experience integrating with **Microsoft 365/SharePoint Online** via **Microsoft Graph**, maintaining SharePoint as the authoritative artifact repository. - Experience implementing **retrieval-augmented generation**, document extraction, NLP workflows, model-evaluation controls, and human-in-the-loop AI decision support. - Familiarity with DoW data platforms, secure cross-boundary integrations, and auditability requirements. - Deep experience designing and implementing **REST APIs**; **GraphQL** strongly preferred. - Strong relational data expertise, especially **PostgreSQL** (modeling, schema evolution, migrations, query optimization, indexing, transactions, HA, backup/restore, replication). - Experience migrating legacy platforms (preferably **MySQL/MongoDB**) to **PostgreSQL** and/or mana
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