Senior Full-Stack Engineer: C#/React, Azure, AI, Irvine

AgileEngine, LLC; Irvine (CA); On-site; USD 150,000 - 210,000; Full time

Job summary

AgileEngine, LLC in Irvine, CA is seeking a Senior Full Stack Engineer to build production software for payments-related domains, using C#/.NET on the backend and React on the frontend. You will design APIs, contribute to Azure cloud infrastructure, and apply AI-assisted coding tools with senior judgment.

The role is on-site daily in Irvine. Must have 4+ years of senior experience with C#/.NET and React, API design expertise, and production Azure experience.

Qualifications

• 4+ years of senior-level production experience with C#/.NET and React.
• Experience designing and maintaining APIs, data flows, production software architecture, and automated tests.
• Production experience with Microsoft Azure services.
• Hands-on experience with AI-assisted coding tools, plus the judgment to review, test, and improve generated work.
• Strong spoken and written English for technical discussions and cross-functional collaboration.
• Ability and willingness to work on-site at the Irvine, CA office daily.
• A builder mentality and comfort working in a fast-moving environment with ambiguity and evolving requirements.

Responsibilities

• Design and build scalable features for internal merchant-processing, compliance, and operational platforms.
• Develop full-stack applications using React on the frontend and C#/.NET on the backend.
• Contribute to architecture and engineering standards while collaborating closely with leadership and other engineers.
• Apply sound practices for API design, data handling, automated testing, code review, security, and maintainability.
• Work within Microsoft Azure and contribute to delivery and operational practices in partnership with the appropriate infrastructure or DevOps owner.
• Use Anthropic Claude or comparable tools for AI-assisted coding, with senior human review of production decisions.
• Contribute to Azure-hosted LLM solutions, including existing GPT-4o mini use cases, when relevant to the product.
• Help establish pragmatic development practices as the engineering organization grows.

Skills

C#/.NET

React

API design

AI-assisted coding tools

English language

Tools

Microsoft Azure

Terraform

Azure DevOps

CI/CD

Job description

AgileEngine, LLC in Irvine, CA is seeking a Senior Full Stack Engineer to build production software for payments-related domains, using C#/.NET on the backend and React on the frontend. You will design APIs, contribute to Azure cloud infrastructure, and apply AI-assisted coding tools with senior judgment.

The role is on-site daily in Irvine. Must have 4+ years of senior experience with C#/.NET and React, API design expertise, and production Azure experience.