.Net/AI Developer

The Mosaic Company•Renton, WA

1d•$125,000 - $145,000

About The Position

The Full-Stack .NET Software Developer brings 5+ years of professional experience delivering modern, cloud-based web applications. This role focuses on building UI-rich applications using React or Svelte, developing scalable APIs and services with .NET, and working with Azure-hosted, database-backed systems. The developer contributes to AI-enabled features and cloud-first deployments, while also providing technical leadership—guiding and mentoring others, consulting with stakeholders on design and architecture, and ensuring the quality and reliability of all technical deliverables.

Requirements

5+ years of experience building full-stack applications in production environments.
Strong hands-on development experience with React or Svelte, .NET (C#), and Azure.
Experience working with relational databases such as SQL Server and PostgreSQL.
Familiarity with REST APIs, authentication/authorization, application security, and cloud deployment workflows.
Experience working with industry-specific clients with large-scale, enterprise software implementations.
Familiarity with and ability to add AI into software development workflows.
Solid written and verbal skills; ability to communicate at all levels of the organization.
Knowledge of design methodologies, tool sets, human-computer interaction, and web and software UI development.
Commitment to researching new technologies, reading publications, participating in professional groups, and maintaining personal networks.
Ability to take ownership of unique, customized design requests and identify opportunities to add value to solutions developed.
Ability to work on multiple projects with tight timelines.

Responsibilities

Design, develop, test, and deploy full-stack applications React/Svelte, .NET (C#) and/or Python, and Azure.
Design and develop responsive UI experiences using modern front-end patterns with React/Svelte and TypeScript-friendly workflows.
Build secure and maintainable back-end services using .NET Web APIs or Python (FastAPI/Flask) with scalable architecture and clean coding practices.
Build and optimize database solutions using SQL Server and/or PostgreSQL, including schema design and query tuning.
Deploy and support cloud applications in Azure, leveraging tools such as App Services, storage, identity, monitoring, and CI/CD pipelines.
Analyze existing technology architecture and topologies to determine appropriate implementation strategies.
Validate design objectives and deliverables through meetings, user requirements, analysis of existing architecture, and other means.
Streamline and upgrade features, and functionality of applications as required.
Implement an array of technologies for disparate technical environments, as technical expert.
Articulate complex concepts to non-technical audiences.
Collaborate with subject matter experts, instructional design consultants, tech staff, and project teams on product and solution development.
Use scientific analysis and mathematical models to predict and measure the outcomes and consequences of design.
Prepare technical documents and specifications, including workflow diagrams, use cases, and functional and non-functional specifications.
Consult and make recommendations to executive-level stakeholders on large-scale software purchases.
Coordinate requirements, schedules, and activities; leads team meetings.
To respond to client and project needs effectively, roles and responsibilities will vary and may include additional responsibilities not listed.