Senior Full-Stack Engineer (.NET / ASP.NET) - Technology

Senior Developer

The Senior Developer is a critical individual contributor responsible for building, extending, and maintaining a secure, enterprise-grade web platform and APIs. Rather than defining technical direction or leading a team, this role requires a highly skilled developer who can deeply understand, respect, and execute within an established reference architecture (specifically a Domain-Driven Design (DDD) and Onion/Hexagonal hybrid architecture).

A major focus of this role will be executing critical third-party financial workflows, heavily dictated by a J.P. Morgan Chase API integration. The ideal candidate brings a strong background in payment gateway integration, server-side rendering, and a solid understanding of data privacy and secure application practices.

Responsibilities

• Build and maintain .NET 10 Web APIs using clean dependency injection and asynchronous programming.

• Strictly follow pre-existing DDD and Onion/Hexagonal hybrid architectures and SOLID principles to keep the codebase decoupled.

• Handle complex SQL Server transactions, optimize queries, and maintain versioned API contracts via OpenAPI/Swashbuckle.

• Maintain and optimize read-heavy Razor Views, View Components, and Partials.

• Utilize Tailwind CSS, HTMX, or Alpine.js for clean, responsive UI layouts.

• Enforce traditional web patterns like POST-Redirect-GET (PRG) and antiforgery tokens for secure form submissions.

• Own secure API integrations with enterprise payment ecosystems (e.g., J.P. Morgan Chase, Stripe, Square).

• Implement strict application-level security, ensuring PII and financial data (credit card numbers) are never exposed or logged.

• Safely consume cloud configurations and credentials managed via Azure Key Vault and App Services.

• Write comprehensive unit, integration, and contract tests using MSTest/NUnit and Playwright.

• Operate successfully as a solo individual contributor within an Azure DevOps (Agile/Kanban) framework.

Qualifications and Job Requirements

• Experience: 8+ years in software development, with 5+ years dedicated to .NET Core / ASP.NET Core (Web API & MVC Razor).

• Modern Stack: Strong proficiency with .NET 10 and C# 14 (Async, DI).

• Architecture: Proven expertise working within established DDD, Onion, or Hexagonal patterns.

• Payment Gateways: Hands-on integration experience with major financial APIs (e.g., J.P. Morgan Chase, Stripe, Square).

• Web Mechanics: Deep understanding of SSR, the lifecycle, antiforgery tokens, and the POST-Redirect-GET (PRG) pattern.

• Data Privacy: Strict adherence to application-level security, ensuring PII and credit card data are never exposed or logged.

• Database & Cloud: Strong SQL Server transaction optimization paired with Azure configuration management (App Services, APIM, Key Vault).

• Execution: Proven ability to operate autonomously as a solo individual contributor within Azure DevOps (Agile/Kanban).

What We Offer

• 100% Remote Work: Enjoy the freedom to work from the location that helps you thrive. All it takes is a laptop and a reliable internet connection.

• Highly Competitive USD Pay: Earn an excellent, market-leading compensation in USD, that goes beyond typical market offerings.

• Paid Time Off: We value your well-being. Our paid time off policies ensure you have the chance to unwind and recharge when needed.

• Work with Autonomy: Enjoy the freedom to manage your time as long as the work gets done. Focus on results, not the clock.

• Work with Top American Companies: Grow your expertise working on innovative, high-impact projects with Industry-Leading U.S. Companies.

Why You'll Like Working Here

• A Culture That Values You: We prioritize well-being and work-life balance, offering engagement activities and fostering dynamic teams to ensure you thrive both personally and professionally.

• Diverse, Global Network: Connect with over 600 professionals in 25+ countries, expand your network, and collaborate with a multicultural team from Latin America.

• Team Up with Skilled Professionals: Join forces with senior talent. All of our team members are seasoned experts, ensuring you're working with the best in your field.

Apply now!