Senior Application Architect (.NET/C#) - GP, Remote: Colombia - Costa Rica, Fulltime.

- This position is open to candidates located in Colombia or Costa Rica only - Senior Application Expert The Senior Application Expert plays a critical role in shaping and evolving application architecture to deliver scalable, high-performing, business-aligned solutions. This role operates at a deep technical level, driving modernization efforts, improving system performance, and ensuring applications integrate seamlessly within the enterprise ecosystem. The ideal candidate combines strong hands-on development expertise with architectural thinking, modernization experience, and the ability to clearly communicate complex technical concepts to both engineering teams and business stakeholders. Key Responsibilities Technical Leadership and Delivery Develop high-quality code aligned with sprint commitments and enterprise standards. Lead modernization initiatives, including migrating legacy .NET applications such as .NET 3.5 systems to .NET Core. Break apart monolithic applications into scalable microservices architectures. Design robust, scalable, and highly available systems that support evolving business needs. Ensure applications follow security-first principles to protect customer data. Collaborate with other architects to align designs with enterprise architecture standards. Produce architectural diagrams and system representations to clearly communicate solution designs. Present technical roadmaps and architectural decisions to engineering teams and stakeholders. Database and Performance Optimization Write advanced SQL queries and optimize performance using indexing strategies and query plan analysis. Refactor legacy systems by moving business logic out of stored procedures when appropriate. Create and maintain DDL scripts and stored procedures as needed. Ensure data integrity, scalability, and performance across relational and non-relational databases. Cloud and DevOps Design and deploy solutions in Microsoft Azure, leveraging cloud-native services. Work with Azure DevOps pipelines and tools such as Octopus for CI/CD automation. Apply DevOps best practices to improve deployment reliability and speed. Experience with AWS is valuable, but strong Azure expertise is required. Full-Stack Development Develop backend services using C#, .NET Core, .NET Framework, Web APIs, and service-based architectures. Build and support modern front-end applications using frameworks such as Angular, React, and Vue.js. Demonstrate proficiency in JavaScript, TypeScript, and Node.js environments. Mentorship and Team Development Mentor junior engineers through pair programming, code reviews, knowledge sharing sessions, and technical discussions. Delegate work according to team members’ strengths and development goals. Provide input for performance evaluations and identify training opportunities. Foster a culture of ownership, accountability, innovation, and continuous improvement. Required Qualifications High school diploma or equivalent required. Bachelor’s degree in Computer Science or related field preferred. 8 to 10 years of software development experience with technical leadership responsibilities. 2 or more years of experience creating technical roadmaps and presenting architectural solutions. Strong full-stack C# development experience within the Microsoft technology stack. Proven experience migrating legacy .NET systems to modern architectures. Demonstrated experience decomposing monolithic applications into microservices. Advanced SQL skills including query optimization, indexing strategies, and performance tuning. Experience with CI/CD tools such as Azure DevOps and Octopus. Experience working with legacy technologies such as VB.NET is valuable. Hands-on experience with Angular and React, with exposure to Vue.js preferred. Strong Azure cloud development experience required. Experience in AWS is a plus, but not a substitute for Azure expertise. Experience designing and documenting system architecture using diagrams and formal representations. Experience in Agile environments and DevOps practices. Preferred Skills Knowledge of VB6, MS SQL Server XML, XSL, ETL, Web Services, SOA, ASP.NET MVC, PowerShell, NoSQL and object databases. Azure cloud certifications preferred. AWS or Google Cloud certifications are a plus. Experience in financial services or other highly regulated industries is desirable. Behavioral and Leadership Expectations Strong communication skills with the ability to clearly explain complex architectural concepts to both technical and non-technical stakeholders. Ability to structure and articulate reasoning in a logical, easy-to-follow manner. Collaborative and approachable team player who contributes positively to team culture. Proactive problem solver with curiosity and determination in tackling complex challenges. Customer-focused mindset with strong attention to quality and testability. Ability to influence stakeholders and drive alignment in complex technical environments.