Senior Backend Engineer with 15+ years in C# and .NET Core, seeking a remote role building scalable cloud systems. Strong background in microservices, Kafka, SQL Server, and Azure/AWS, with fintech and banking experience. I want to own backend architecture, lead and mentor developers, and grow in AI-enabled applications. Open to full-time or long-term contract roles paid in USD.
Looking for a job
Jesus Castrillo
@jcastrillo
Senior Backend Engineer with 15+ years in C# and .NET Core. Cloud microservices on AWS and Azure, fintech and banking, and technical leadership.
ColombiaWhat I'm looking for
Senior Backend Engineer with 15+ years of experience building .NET and cloud systems for fintech, banking, and enterprise software. I specialize in C#, .NET Core, microservices, Kafka, and SQL Server, deployed on AWS and Azure.
At Routeware, I delivered an Amazon S3 integration that moved PDF generation from local file storage to multipart uploads. I also built .NET Core services on AWS and worked with GitHub Actions CI/CD pipelines.
At N5 Now, I grew from Back End Developer to Technical Lead, leading a team of five developers delivering cloud-hosted .NET microservices on Kubernetes across AWS and Azure. I also built the foundation of the "Goals" project in Python (AWS Glue ETLs, MongoDB, APIs) and served as project manager on a fraud project for a Panamanian bank.
Earlier, at Bprosys, I developed financial-services backends with .NET Core and Python, automated banking processes, and built system integrations.
I hold the Azure App Development certification, am pursuing Microsoft's AI-200, and enjoy exploring AI agents and RAG systems. I'm looking for a remote Senior Backend or Tech Lead role.
Experience
Work history, roles, and key accomplishments
RI
Senior .NET Software Engineer
Routeware Inc.
Dec 2025 - Oct 2026 (10 months)
Delivered S3 integration migrating PDF generation to Amazon S3 using multipart uploads. Developed .NET Core services on AWS with CQRS/MediatR and feature flags, and contributed to CI/CD pipelines and team mentorship.
NN
Technical Lead, .NET
N5 Now
Apr 2024 - Dec 2025 (1 year 8 months)
Led a team of 5 developers building cloud-hosted .NET microservices on Kubernetes across AWS and Azure. Enforced engineering best practices, delivered via Azure DevOps pipelines, and provided mentorship.
NN
Backend Developer
N5 Now
Apr 2023 - May 2024 (1 year 1 month)
Developed and integrated applications and microservices using .NET Core and Python. Built Web API microservices on Kubernetes with Kafka, Elasticsearch, and SQL Server for financial-services backends.
BI
.NET Developer & Integrator
Bprosys Inc.
Jul 2018 - Apr 2023 (4 years 9 months)
Automated internal business processes in banking using RPA. Developed .NET applications and integrations, built ETL processes with SSIS, and performed CRM integration and data migration into Oracle.
Education
Degrees, certifications, and relevant coursework
IM
Instituto Universitario Politecnico Santiago Marino
Systems Engineering, Systems Engineering
2023 -
Pursuing a Systems Engineering degree through credit recognition since September 2023.
CT
Colegio Universitario Fermin Toro
Associate Degree, Computer Science
Earned an Associate Degree in Computer Science in 2001.
IL
Instituto Tecnologico Lourtec
Microsoft Professional Developer, Professional Development
Completed the Microsoft Professional Developer program.
Availability
Looking for a job
Location
ColombiaAuthorized to work in
Salary expectations
60k-90k USD
Social media
Job categories
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