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.