Senior IT Application Developer – ASP.NET Core, C#, SQL Server

Redtech

. Design a means to generate an Asset Key from a globally unique identifier (GUID) .

Posted 9/19/2026contractRemote • United StatesSenior💰 $75 - $85 per hourWebsite

Core Competencies

Role fit

Core Competencies

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Demonstrates expertise in designing and implementing web applications, REST APIs, and modular services using ASP.NET Core, C#, and SQL Server. Proficient in establishing data integrity and security measures while collaborating effectively with technical teams and stakeholders.

Highest-signal resume keywords

ASP.NET Core DevelopmentREST API DesignSQL Server ManagementFull-Stack DevelopmentAuthentication and Authorization Implementation

ATS Keywords

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Hard Skills

C#Entity Framework CoreDapperHTMLCSSJavaScriptGitCI/CD PipelinesAutomated Testing FrameworksQuery Mechanisms

Soft Skills

Strong Problem-Solving SkillsCollaboration with Technical StaffDocumentation Skills

Tools & Technologies

Azure Web AppsAzure SQLKey VaultAgile/Scrum MethodologiesESRI

Industry Keywords

Data Exchange LayerSource of TruthSign Change ManagementBIM/IFC Data StandardsSaaS/COTS Software Implementation

Tech Stack

Tools & technologies

ASP.NETAzureEntity FrameworkJavaScriptSQLVault.NET

About the role

Key responsibilities & impact

Design a means to generate an Asset Key from a globally unique identifier (GUID)
Assign Asset Keys to new ecosystem signs and retroactively assign them to existing signs
Help the client data modeler design and implement the database crosswalk and sign data schema
Design and implement the Data Exchange Layer (DEL) mediator component
Define DEL endpoints for sending IFC-centric sign data to and receiving data from the sign ecosystem
Enforce sign-change business rules and write pending sign changes to a staging environment
Design and implement the Gatekeeper component and its user interface
Display staged sign-data changes for review and allow approval, correction, or rejection
Propagate approved sign changes to the ecosystem
Implement security, administration, authentication, authorization, role-based access controls, and contextual help
Establish the sign data Source of Truth (SoT) and enable retrieval by Asset Key or identifier
Implement query mechanisms and direct-query user interfaces
Provide troubleshooting and maintenance during pilot phases
Document endpoints, interfaces, processes, and in-app guidance
Contribute to end-user training materials
Participate in project meetings, sprint planning, development cycles, demos, and retrospectives

Requirements

What you’ll need

Must reside in the US
Must be available to start work on 10/12/2026
Monday through Friday, 8 AM to 5 PM Pacific Time schedule
Design, develop, and maintain web applications, REST APIs, and modular services using ASP.NET Core, C#, SQL Server, Entity Framework Core or Dapper, HTML, CSS, and JavaScript
Experience with Git, code review systems, CI/CD pipelines, and automated testing frameworks
Experience with Azure Web Apps, Azure SQL, Key Vault, REST API design, and modern .NET versions (6/7/8)
Full-stack development experience, including backend and frontend frameworks
Ability to collaborate with application, database, and network technical staff
Experience defining API endpoints
Strong problem-solving skills and ability to optimize, enhance, and fix existing applications
Experience implementing business rules for sign change management, lifecycle enforcement, and audit logging
Experience gathering requirements and delivering solutions with business analysts, subject matter experts, and technical staff
Experience participating in project meetings, sprint planning, development cycles, demos, and retrospectives
Experience enforcing business rules for sign changes; staging and reviewing pending changes
Experience developing workflow-related logic
Experience developing Gatekeeper components for reviewing, approving, correcting, or rejecting sign changes; propagating approved changes and maintaining logs
Experience establishing a Source of Truth (SoT) and retrieving sign data by Asset Key or identifier
Experience assigning and managing global Asset Keys and cross-referencing member system identifiers
Experience creating query mechanisms and user interfaces for retrieving SoT sign data
Experience implementing authentication, authorization, administration, role-based access controls, data integrity, privacy, and auditability standards
Ability to document endpoints, interfaces, and processes
Ability to contribute to in-app guidance, help documentation, and end-user training materials
Desirable: experience with ESRI, BIM/IFC data standards, large-scale SaaS/COTS software implementation, State of Washington or other state agencies, bSDD, IFC, and Agile/Scrum methodologies

Benefits

Comp & perks

Choice of 2 Medical/RX insurance plans from Premera (Blue Cross/Blue Shield); employee premium 100% company paid by Redtech
Optional Dental/Vision coverage
Paid Time Off (PTO)
401(k) plan with company match
Company paid Life/AD&D insurance for employee, packaged with Medical insurance participation