Senior Full Stack Engineer

Digital Consultants LLC

• 19 hours ago

Full Stack Engineer

position

United States

time

Full-time

remote

Remote

seniority

Senior Level

Digital Consultants LLC is a certified SBA 8(a) small business that delivers professional IT solutions to Federal, civilian, and private-sector customers. The Full Stack Engineer will maintain and modernize mission-critical operational systems across React, Node.js, C#/.NET, SQL Server, authentication, APIs, and real-time services while supporting security, reliability, and cloud-readiness initiatives.

Consulting

Information Technology

Cyber Security

Network Security

check

Growth Opportunities

Responsibilities

Maintain and enhance a React-based operational dashboard for login, unit visibility, geofencing, and admin tooling

Support and improve a Node.js/Express backend proxy managing session authentication, SQL access, geospatial CRUD, file uploads, and service choreography

Maintain and extend legacy C#/.NET Framework services including REST APIs, SOAP (ASMX) endpoints, and internal server processes

Support modernization initiatives, including migration toward .NET Core and ASP.NET Core Identity

Diagnose and resolve issues across UI, backend APIs, databases, and real-time communication layers

Improve reliability, security posture, and maintainability without interrupting ongoing operations

Document core workflows, API contracts, deployment processes, and system dependencies

Collaborate on feature-tiering workflows to support iOS/Android subscription models tied to App Store/Play Store purchases

Qualification

C#/.NET Framework and ASP.NET Web API

React

Node.js/Express

SQL Server

ASP.NET Core/.NET 6+

REST and SOAP APIs

Authentication and Identity Management

OAuth2/OIDC and JWT

SignalR

Redis

AWS

Geospatial Computing

Required

Public Trust required

Strong C# experience with ASP.NET Web API, MVC, and ASMX SOAP services on .NET Framework 4.6.x

Experience with modern .NET Core/.NET 6+ for APIs, background services, and refactoring legacy codebases

Strong JavaScript experience across React (hooks, state management) and Node.js/Express

Deep SQL Server expertise including performance tuning, schema analysis, safe updates, and spatial queries

Hands-on authentication/security experience

ASP.NET Membership (legacy user stores), Session/cookie auth, MFA/TOTP flows, JWT handling

Experience with (or ability to maintain) mixed API ecosystems (REST + SOAP + event-driven + real-time components)

Strong debugging and incident-response skills across distributed systems

Comfortable working in legacy codebases while delivering incremental modernization

Experience migrating authentication systems from ASP.NET Membership to ASP.NET Core Identity

Understanding of identity hardening practices for regulated environments (GovCloud, FedRAMP)

Familiarity with OAuth2/OIDC, claims/role-based authorization, token lifecycles

Experience scaling SignalR using Redis backplanes, messaging queues, or distributed event systems

Experience with distributed caching platforms (Redis, Memcached)

Preferred

Experience migrating authentication systems from ASP.NET Membership to ASP.NET Core Identity

Understanding of identity hardening practices for regulated environments (GovCloud, FedRAMP)

Familiarity with OAuth2/OIDC, claims/role-based authorization, token lifecycles

Experience scaling SignalR using Redis backplanes, messaging queues, or distributed event systems

Experience with distributed caching platforms (Redis, Memcached)

Experience with message queues such as RabbitMQ, AWS SQS, Kafka, or Azure Service Bus

Experience deploying .NET, Node.js, or hybrid systems into AWS (EC2, ECS/EKS, Elasticache, CloudWatch)

Bonus for experience deploying into AWS GovCloud or other regulated environments

Experience with CI/CD (GitHub Actions, Azure DevOps, Jenkins, TeamCity)

Experience configuring IIS, Kestrel, Node servers, Windows services, and basic networking (DNS, SSL, load balancers)

Experience with geospatial logic

geometry/geography types, spatial indexes, geofence calculations

Experience with real-time field operations, logistics, tracking, mapping, or dispatch-style systems

Experience integrating backend systems with App Store / Play Store subscription verification

Ability to build server-side logic for feature tiers, entitlements, and product catalog selection

Experience supporting onboarding flows linking web signup to mobile app subscription activation

Experience containerizing workloads with Docker

Experience with structured logging/observability (Serilog, ELK, OpenTelemetry, CloudWatch)

Experience managing API versioning and backward compatibility