Senior/Lead Full Stack Engineer

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

We are looking for a Senior Full Stack Engineer to help build production software for merchant processing, compliance automation, and AI-enabled operational tools within a growing payments engineering team. You will design and develop full-stack applications using C#/.NET on the backend and React on the frontend, contribute to API design and Microsoft Azure cloud infrastructure, and apply AI-assisted coding tools with senior engineering judgment. This role is onsite daily in Irvine, CA, and requires experience in payments, financial services, or other security-sensitive environments.

What you will do

• 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.

Must haves

• 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.

Nice to haves

• Experience with Terraform or another Infrastructure as Code tool.
• Experience with Azure DevOps, CI/CD, and production delivery practices.
• Experience in payments, financial services, regulated systems, or other security-sensitive environments.
• Experience with compliance automation, web-scraping systems, or high-risk transaction processing.
• Experience with observability, secure software design, and production incident ownership.
• Experience mentoring engineers or helping define team practices, if leadership responsibilities are confirmed.
• Growth without limits: build your skills through mentorship, internal TechTalks, challenging projects, and a dedicated annual learning budget
• Competitive compensation: get recognition that reflects your skills and impact, with regular performance and compensation reviews
• Flexibility: work 100% remotely with flexible hours that support focus, autonomy, and a healthy work rhythm
• Meaningful, modern projects: build impactful products using modern technologies alongside global teams and leading brands
• Collaborative culture: join a supportive environment with zero micromanagement where ideas are welcomed and contributions are recognized
• Well-being & support: access local well-being programs and people-focused support tailored to your location

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1

Tell us about yourself

Submit a short application form.

2

Pass a 30’- 60’ test.

3

Record a short video

Introduce yourself on video to fast-track your application process.

4

Meet our team

Once you pass the video review, grab a spot on our calendar for a technical interview.

5

Get an offer

Welcome to AgileEngine!

FAQ

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