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Juan Carlos Amaya

@juancarlosamaya

Message

I build scalable .NET backend platforms, APIs, and cloud systems for complex operations.

Costa Rica

Message

I've spent 25+ years building and scaling backend platforms that turn complex operational data into reliable software. At Extensiv, I own end-to-end warehouse capabilities across receiving, inventory, allocation, picking, packing, shipping, billing, and rules.

I build REST APIs, shared fulfillment logic, and event-driven automation that keep inventory, order state, and billing consistent across concurrent, multi-tenant 3PL operations. My work integrates Shopify, ShipStation, BrightPearl, Amazon, EDI, carriers, QuickBooks, and FTP while supporting recoverable updates and operational reliability.

Previously, I built high-volume transactional services at PayByPhone and helped guide AWS serverless deployments using TeamCity, SQS, SNS, and EC2. I've also supported enterprise workflow, risk-management, financial, and data-processing platforms, while mentoring developers through reviews, training, and structured releases.

Experience

Work history, roles, and key accomplishments

Senior Software Developer

Extensiv

Feb 2021 - Sep 2026 (5 years 7 months)

Owned end-to-end warehouse features across a dual-stack .NET system, designing core fulfillment logic and building REST APIs. Delivered event-driven automation and integrated with third-party systems like Shopify and Amazon.

C#.NET Web Forms ASMX Web APIs MVC Hangfire REST APIs OAuth SQL Server Shopify ShipStation Brightpearl Amazon EDI Quickbooks FTP Unit Testing Regression Testing

Senior Software Developer / Team Lead

PayByPhone

Feb 2011 - Feb 2021 (10 years)

Designed and maintained core backend services and APIs for distributed applications in the parking sector. Built scalable services for high-volume transactional data and assisted in AWS infrastructure deployment.

Backend Development APIs AWS TeamCity Amazon SQS SNS EC2 Fan Out Architecture Third Party Integrations Code Review Training

Senior Software Developer

Fiserv Costa Rica

Jun 2008 - Feb 2011 (2 years 8 months)

Developed backend systems and administrative services based on generic product frameworks. Supported enterprise-scale workflow managers, risk-management systems, and data-processing platforms.

Backend Development Workflow Management Risk Management Data Processing System Reliability

Software Developer

Builderhomesite Inc.

Jun 2006 - Feb 2008 (1 year 8 months)

Designed and enhanced core web services and applications using ASP.NET and SQL Server. Collaborated directly with clients to translate business requirements into software.

ASP.NET SQL Server Web Services Client Collaboration