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Liandre John de Castro

@liandrejohndecastro

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Tech Lead at Crescendo Collective who modernized 100+ localized websites and built platforms that cut costs.

Philippines

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At Crescendo Collective, I led technical solutioning and client POC demos that secured a $1M statement of work, then defined delivery scope across four delivery teams.

I owned architecture and hands-on full-stack delivery of a Magnolia headless CMS platform for 100+ localized websites. I also established Schema.org structured data for Generative Engine Optimization, generating 2,500+ monthly referral visits from AI answer engines.

I architected an AWS serverless product data platform that cut annual operating costs by 30%, and built a Java and Spring Website Kiosk that saved 1,000+ engineering hours annually. Earlier, I developed a Java and Spring Transformation Layer that replaced 15+ bespoke integrations and saved $250K+ in development costs.

Experience

Work history, roles, and key accomplishments

Current

Tech Lead

Current

Crescendo Collective

Mar 2025 - Present (1 year 7 months)

Led technical solutioning and client POC demos that secured a $1M statement of work, then defined delivery scope, timelines, and implementation across 4 delivery teams. Owned architecture and hands-on full-stack delivery of a Magnolia headless CMS platform modernizing 100+ localized websites.

Java Spring Framework REST APIs React Next.js Azure Magnolia CMS AWS NodeJS AWS Lambda API Gateway PostgreSQL Schema.Org Generative Engine Optimization Serverless Architecture

Senior Java Full-Stack Developer

Crescendo Collective

Jun 2022 - Mar 2025 (2 years 9 months)

Engineered a configurable Transformation Layer with Java, Spring, Spring Boot, and REST APIs that replaced 15+ bespoke integrations, standardized CRM data exchange, and saved $250K+ in development costs. Built a configurable Magnolia CMS paywall with application security, authentication, and authorization controls, gating premium content and driving 35,000+ new registrations annually.

Java Spring Framework Spring Boot REST APIs Magnolia CMS NodeJS AWS Lambda DynamoDB API Gateway Claude Code MCP Authentication Authorization

Java Full-Stack Developer

Crescendo Collective

Jun 2021 - Jun 2022 (1 year)

Built a secure authentication system in Java, Spring Boot, REST APIs, and Magnolia CMS, enabling registration, login, and profile management for 100,000+ healthcare professionals. Eliminated 1,200+ hours of manual verification annually by automating 4,000+ monthly registration checks through master data integration.

Java Spring Boot REST APIs Magnolia CMS Authentication Authorization Data Integration

Software Engineer Analyst

Accenture

Feb 2021 - Jun 2021 (4 months)

Standardized Kubernetes and Helm configurations across 15+ application containers running 300+ AWS-hosted web services, reducing configuration drift across environments.

Kubernetes Helm AWS Configuration Management

Associate Software Engineer

Accenture

Mar 2020 - Feb 2021 (11 months)

Implemented an 'Engineering Data Management System' in Java and Spring Boot, delivering 50+ microservices backed by 30+ Oracle tables to automate data exchange across engineering workflows.

Java Spring Boot Microservices Oracle Data Management