Full Stack Developer

Concept Solutions, LLC

. Build, maintain, and modernize critical enterprise web applications .

Posted 9/18/2026full-timeRemote • District of Columbia • United StatesMid-LevelSenior💰 $110,000 - $114,000 per yearWebsite

Core Competencies

Role fit

Core Competencies

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Demonstrates expertise in full-stack web application development, particularly in modernizing legacy systems and migrating to AWS. Proficient in building secure, accessible applications with a strong focus on CI/CD practices and compliance with FISMA Moderate standards.

Highest-signal resume keywords

Full-Stack Web Application DevelopmentAWS Migration and DeploymentRESTful API DesignLegacy System ModernizationCI/CD Pipeline Management

ATS Keywords

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Applicant Tracking System Keywords

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Hard Skills

HTML5CSS3JavaScriptTypeScript.NET CoreC#Node.jsPythonMicroservices ArchitectureRelational Databases

Tools & Technologies

AWS GovCloudAWS OutpostsAzure DevOpsGitLab CIGitHub Actions

Certifications & Qualifications

CompTIA Security+AWS Certified Developer (Associate)AWS Certified Solutions Architect (Associate)

Industry Keywords

DevSecOpsFISMA ModerateNIST SP 800-53OWASP Top 10SharePoint

Tech Stack

Tools & technologies

AngularAWSAzureCloudJavaScriptMicroservicesMS SQL ServerNode.jsPostgresPythonReactSQLTypeScriptVue.js.NET

About the role

Key responsibilities & impact

Build, maintain, and modernize critical enterprise web applications
Refactor and migrate legacy web applications and workflows from Microsoft SharePoint Subscriber Edition on-premises to open-source technology stacks hosted on AWS
Use AI to refactor legacy code
Develop front-end and back-end code that is performant, accessible, and secure
Modernize legacy application interfaces into secure cloud architectures
Remediate findings from automated security pipelines
Establish resilient, error-tolerant workflows supporting continuity of operations
Participate as a member of the DevSecOps team
Build code layers with redundancy, error handling, and failover capabilities
Support highly available mission-essential FAA functions under a FISMA Moderate framework
Refactor legacy SharePoint pages, Master Pages, InfoPath forms, and web parts into open-source UI frameworks
Replace proprietary SharePoint server-side and client-side object models with RESTful API architectures
Decompose monolithic logic into microservices or serverless applications
Migrate SharePoint content and list data to relational databases
Refactor SharePoint workflows into AWS Step Functions or event-driven serverless architectures
Deploy and optimize applications in AWS GovCloud and AWS Outposts
Operate CI/CD pipelines with automated SAST/DAST security scans
Align SharePoint permissions and Active Directory security groups with AWS federated identity services

Requirements

What you’ll need

Bachelor's degree in a technical discipline (Computer Science, Electrical Engineering, Information Technology, or a related field)
5 years of experience in full-stack web application development
Proven track record refactoring monolithic/legacy platforms and migrating workloads to AWS
3 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
Deep understanding of HTML5, CSS3, modern JavaScript/TypeScript
Proficiency in .NET Core, C#, Node.js, or Python
Experience designing secure, modular RESTful APIs
Experience replacing SharePoint SSOM and CSOM with open-source API architectures
Experience decomposing monolithic logic into microservices or serverless applications
Experience analyzing SharePoint site hierarchies, document libraries, lists, and item-level permissions
Experience migrating SharePoint list data into relational databases such as Microsoft SQL Server, PostgreSQL, or Amazon RDS
Experience refactoring SharePoint workflows into AWS Step Functions or serverless event-driven architectures
Familiarity with AWS GovCloud and AWS Outposts
Understanding of CI/CD pipelines such as Azure DevOps, GitLab CI, or GitHub Actions
Strong proficiency in OWASP Top 10 secure coding principles
Knowledge of NIST SP 800-53 security controls and FISMA Moderate
Experience remediating pipeline scan findings
Experience aligning SharePoint permissions and AD security groups with AWS IAM, AWS IAM Identity Center, OAuth2, OIDC, and SAML
Secret Clearance
CompTIA Security+ required within 6 months of hire to satisfy IAM-II compliance
AWS Certified Developer (Associate) or AWS Certified Solutions Architect (Associate) preferred
Professional certifications in React, Angular, or Vue preferred
Ability to work 40 hours per week, Monday through Friday, during core hours of 9:00 a.m. to 3:00 p.m. local time

Benefits

Comp & perks

Health insurance
Dental insurance
Vision insurance
Life insurance
Comprehensive 401(k) plan with matching and immediate vesting
Career development
Positive workplace culture centered on innovation and engagement