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

<h2><strong>About Truelogic</strong></h2> <p>At Truelogic we are a leading provider of nearshore staff augmentation services headquartered in New York. For over two decades, we’ve been delivering top-tier technology solutions to companies of all sizes, from innovative startups to industry leaders, helping them achieve their digital transformation goals.</p> <p>Our team of 600+ highly skilled tech professionals, based in Latin America, drives digital disruption by partnering with U.S. companies on their most impactful projects. Whether collaborating with Fortune 500 giants or scaling startups, we deliver results that make a difference.</p> <p>By applying for this position, you’re taking the first step in joining a dynamic team that values your expertise and aspirations. We aim to align your skills with opportunities that foster exceptional career growth and success while contributing to transformative projects that shape the future.</p> <h2><strong>Our Client</strong></h2> <p>A leading B2B digital marketing agency </p> <h2><strong>Job Summary</strong></h2> <p>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).</p> <p>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.</p> <h2><strong>Responsibilities</strong></h2> <ul> <li> <p>Build and maintain <strong>.NET 10 Web APIs</strong> using clean dependency injection and asynchronous programming.</p> </li> <li> <p>Strictly follow pre-existing <strong>DDD and Onion/Hexagonal hybrid architectures</strong> and SOLID principles to keep the codebase decoupled.</p> </li> <li> <p>Handle complex <strong>SQL Server transactions</strong>, optimize queries, and maintain versioned API contracts via <strong>OpenAPI/Swashbuckle</strong>.</p> </li> <li> <p>Maintain and optimize read-heavy <strong>Razor Views, View Components, and Partials</strong>.</p> </li> <li> <p>Utilize <strong>Tailwind CSS, HTMX, or Alpine.js</strong> for clean, responsive UI layouts.</p> </li> <li> <p>Enforce traditional web patterns like <strong>POST-Redirect-GET (PRG)</strong> and antiforgery tokens for secure form submissions.</p> </li> </ul> <ul> <li> <p>Own secure API integrations with enterprise payment ecosystems (e.g., <strong>J.P. Morgan Chase, Stripe, Square</strong>).</p> </li> <li> <p>Implement strict application-level security, ensuring PII and financial data (credit card numbers) are never exposed or logged.</p> </li> <li> <p>Safely consume cloud configurations and credentials managed via <strong>Azure Key Vault</strong> and <strong>App Services</strong>.</p> </li> </ul> <ul> <li> <p>Write comprehensive unit, integration, and contract tests using <strong>MSTest/NUnit</strong> and <strong>Playwright</strong>.</p> </li> <li> <p>Operate successfully as a <strong>solo individual contributor</strong> within an <strong>Azure DevOps (Agile/Kanban)</strong> framework.</p> </li> </ul> <h2><strong>Qualifications and Job Requirements</strong></h2> <ul> <li> <p><strong>Experience:</strong> 8+ years in software development, with 5+ years dedicated to <strong>.NET Core / </strong><a href="http://ASP.NET" rel="nofollow ugc noopener" target="_blank"><strong>ASP.NET</strong></a><strong> Core (Web API &amp; MVC Razor)</strong>.</p> </li> <li> <p><strong>Modern Stack:</strong> Strong proficiency with <strong>.NET 10</strong> and <strong>C# 14</strong> (Async, DI).</p> </li> <li> <p><strong>Architecture:</strong> Proven expertise working within established <strong>DDD, Onion, or Hexagonal</strong> patterns.</p> </li> <li> <p><strong>Payment Gateways:</strong> Hands-on integration experience with major financial APIs (e.g., <strong>J.P. Morgan Chase, Stripe, Square</strong>).</p> </li> <li> <p><strong>Web Mechanics:</strong> Deep understanding of SSR, the HTTP lifecycle, antiforgery tokens, and the <strong>POST-Redirect-GET (PRG) pattern</strong>.</p> </li> <li> <p><strong>Data Privacy:</strong> Strict adherence to application-level security, ensuring PII and credit card data are never exposed or logged.</p> </li> <li> <p><strong>Database &amp; Cloud:</strong> Strong <strong>SQL Server</strong> transaction optimization paired with <strong>Azure</strong> configuration management (App Services, APIM, Key Vault).</p> </li> <li> <p><strong>Execution:</strong> Proven ability to operate autonomously as a <strong>solo individual contributor</strong> within Azure DevOps (Agile/Kanban).</p> </li> </ul> <h2><strong>What We Offer</strong></h2> <ul> <li> <p>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.</p> </li> <li> <p>Highly Competitive USD Pay: Earn an excellent, market-leading compensation in USD, that goes beyond typical market offerings.</p> </li> <li> <p>Paid Time Off: We value your well-being. Our paid time off policies ensure you have the chance to unwind and recharge when needed.</p> </li> <li> <p>Work with Autonomy: Enjoy the freedom to manage your time as long as the work gets done. Focus on results, not the clock.</p> </li> <li> <p>Work with Top American Companies: Grow your expertise working on innovative, high-impact projects with Industry-Leading U.S. Companies.</p> </li> </ul> <h2><strong>Why You’ll Like Working Here</strong></h2> <ul> <li> <p>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.</p> </li> <li> <p>Diverse, Global Network: Connect with over 600 professionals in 25+ countries, expand your network, and collaborate with a multicultural team from Latin America.</p> </li> <li> <p>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.</p> </li> </ul> <p>Apply now!</p>