Full Stack Developer

CONCEPT SOLUTIONS LLC•Washington, DC

7d•$110,000 - $114,000•Remote

About The Position

Concept Solutions is seeking a Mid-Level Full Stack Developer to support the FAA’s Command, Control, and Communications (C3) office as part of a dedicated IT and DevSecOps team. The role contributes to the C3 office’s mission of maintaining situational awareness and continuity of communications during emergencies, disasters, or critical equipment malfunctions. The position is remote for candidates within a two-hour drive of Washington, DC. The developer will build, maintain, and modernize enterprise web applications, helping refactor and migrate legacy applications and workflows from on-premises Microsoft SharePoint Subscriber Edition to modern open-source technology stacks hosted on AWS, including AWS GovCloud and AWS Outposts. The work also includes using AI to refactor legacy code and bridging legacy on-premises systems with cloud environments. The role supports secure, performant, accessible, and robust front-end and back-end applications for highly available mission-essential functions under a FISMA Moderate framework. Work includes modernizing interfaces and cloud architectures, addressing automated security-pipeline findings, and developing resilient, error-tolerant workflows that support continuity of operations. The position is scheduled for 40 hours per week, Monday through Friday, with core hours from 9:00 a.m. to 3:00 p.m. local time. Travel is 0–10%, and a Public Trust security requirement applies.

Requirements

Bachelor’s degree in a technical discipline such as Computer Science, Electrical Engineering, Information Technology, or a related field.
Five years of experience in full-stack web application development, including refactoring legacy platforms and migrating workloads to AWS.
Three or more years of practical experience building and maintaining complex, responsive, and accessible web interfaces.
Experience modernizing legacy SharePoint pages, customized Master Pages, InfoPath forms, and web parts into open-source UI frameworks.
Knowledge of HTML5, CSS3, and modern JavaScript or TypeScript.
Proficiency in server-side open-source development such as .NET Core, C#, Node.js, or Python, and experience designing secure, modular RESTful APIs.
Experience replacing SharePoint SSOM and CSOM with standard API architectures.
Experience decomposing monolithic logic into microservices or serverless applications.
Experience assessing SharePoint site hierarchies, document libraries, lists, and complex item-level permissions.
Experience migrating SharePoint list data into relational databases such as Microsoft SQL Server, PostgreSQL, or Amazon RDS, and optimizing queries.
Experience refactoring SharePoint Designer, Power Automate, or K2 workflows into cloud-native workflow engines or serverless event-driven architectures.
Familiarity with refactoring and optimizing legacy applications for AWS GovCloud and AWS Outposts.
General understanding of CI/CD pipelines such as Azure DevOps, GitLab CI, or GitHub Actions, including automated SAST/DAST scans and code deployment.
Strong proficiency in secure coding principles, including OWASP Top 10, and knowledge of NIST SP 800-53 controls within a FISMA Moderate framework.
Experience remediating findings from automated pipeline scans.
Experience aligning SharePoint permissions and AD security groups with AWS IAM, AWS IAM Identity Center, and OAuth2, OIDC, or SAML.
Ability to meet the Public Trust security requirement.
CompTIA Security+ certification required within six months of hire to satisfy IAM-II compliance.

Nice To Haves

AWS Certified Developer – Associate certification.
AWS Certified Solutions Architect – Associate certification.
Professional certification in front-end methodologies such as React, Angular, or Vue.

Responsibilities

Build, maintain, and modernize critical enterprise web applications.
Refactor and migrate legacy SharePoint applications and workflows to modern open-source technology stacks hosted on AWS, including AWS GovCloud and AWS Outposts.
Use AI to refactor legacy code.
Modernize legacy SharePoint pages, customized Master Pages, InfoPath forms, and web parts into open-source UI frameworks.
Develop secure, modular RESTful APIs and replace SharePoint server-side and client-side object-model implementations with standard API architectures.
Decompose monolithic application logic into microservices or serverless applications.
Assess legacy SharePoint site hierarchies, document libraries, lists, and item-level permissions.
Migrate SharePoint list data into relational database models and optimize queries.
Refactor legacy SharePoint workflows into modern cloud-native workflow engines or serverless event-driven architectures.
Work with automated CI/CD deployment pipelines and automated SAST/DAST security scans.
Help build code layers with redundancy, error handling, and failover capabilities to support continuity of operations.
Apply secure coding practices, remediate pipeline scan findings, and support compliance with applicable security controls.
Align SharePoint permissions and Active Directory security groups with AWS IAM, AWS IAM Identity Center, and federated identity protocols.