Senior Full-Stack Engineer (.NET / Azure) – Tech Lead at Agility.io

Location: Remote (Latin America) Job Type: Full-time, Contract About Us: AgilityIO is a software development firm that designs and builds custom applications for startups and Fortune 500 companies. We are a global team of over 400 developers, QA engineers, project managers, and UX/UI designers with offices in New York City and Vietnam. This is a full-time contractor role based in Latin America. We are seeking an experienced Technical Lead to drive architectural decisions, provide hands-on technical guidance, and mentor engineers across distributed teams. This role is ideal for someone who enjoys solving complex technical challenges, leading by example, and ensuring engineering excellence at scale. This role is ideal for a Senior Engineer ready to take on technical leadership responsibilities while remaining hands-on in development. Job Responsibilities: - Lead the architecture, design, and delivery of scalable full-stack applications using .NET and Next.js - Provide technical leadership across projects, ensuring best practices in performance, security, scalability, and maintainability - Design and implement cloud-native solutions on Azure, including App Services, Front Door, and Azure SQL - Guide engineers through code reviews, technical mentoring, and architectural guidance - Collaborate with product managers, designers, and stakeholders to align technical solutions with business goals - Define and maintain engineering standards, CI/CD practices, and development workflows - Oversee system reliability, monitoring, and observability using Azure tools such as Application Insights - Support the design and implementation of real-time features using technologies such as SignalR (websockets) - Lead integrations with external services including authentication platforms and payment systems - Identify technical risks and proactively propose solutions and mitigation strategies - Serve as a key escalation point for complex technical challenges across the team Qualifications & Experience: - 7+ years of professional software development experience, including experience taking on technical leadership responsibilities within a team - Strong experience building backend services with .NET (preferably .NET 8) - Proficiency with Entity Framework Core and experience designing APIs using OData - Strong experience with SQL Server / Azure SQL Database - Experience building modern frontends using Next.js and component libraries such as Material UI (MUI) - Familiarity with real-time communication technologies such as SignalR or WebSockets - Experience designing and deploying applications on Microsoft Azure, including App Services, Front Door, and Application Insights - Hands-on experience with CI/CD pipelines using GitHub Actions - Experience managing infrastructure using Infrastructure as Code tools (Pulumi preferred) - Experience integrating third-party services such as Auth0 for authentication and Stripe or Spreedly for payment processing - Strong understanding of modern software engineering practices, including testing, security, performance optimization, and Agile methodologies - Excellent communication and collaboration skills in distributed, remote-first teams. - Fluent English (written and spoken) Preferred Qualifications: - Experience deploying and scaling applications using Vercel for frontend hosting - Experience designing high-availability cloud architectures on Azure - Prior experience working in distributed teams across multiple time zones - Experience with high-traffic platforms, SaaS systems, or payment integrations - Demonstrated ability to drive technical improvements and engineering best practices across teams What We Offer: - Competitive salary and performance-based bonuses - Flexible remote work environment - Professional growth opportunities and mentorship programs - Engaging and collaborative team culture with cutting-edge projects Ready to Make an Impact? If you're passionate about building high-quality software, contributing to technical direction, and growing into a technical leadership role while staying hands-on, we’d love to hear from you.