Senior Lead Consultant
CGI
Full-time · EMEA / Global programs
A CGI partner specializing in Mulesoft Integrations for Christian Dior across EMEA and global markets.
Hello! I'm
ERNEST
JOHN
Senior Integration Consultant
Lead Consultant at CGI Philippines · APIs, integrations, and production systems
Ernest John Maskariño
About Me
I’m a Lead Consultant and Senior MuleSoft Developer specializing in API development, system integration, and enterprise solutions. I have experience working with complex integrations and production systems, helping businesses connect applications and streamline their processes.
I treat APIs as products: RAML contracts, MUnit tests, CI/CD, and documentation get the same attention as the happy path. I grew from intern at INDRA to senior integration engineer — utilities companies, Digital and traditional banking, Retail, e-commerce.
Today, I support post-production operations for Christian Dior across EMEA and global markets, coordinating releases with stakeholders and strengthening the standards that keep production stable and reliable.
WHAT
I DO
Years shipping software
Companies across APAC
Freelance Projects
MCD
MuleSoft Certified Developer L1
End-to-End
The API-led stack
Click a layer to explore.
Core systems & channels
Shopify, core banking, retail, and department systems that become reusable APIs — Metrobank CDD, Shiseido commerce, Razer AMS, and internal channels that consume them.
My career &
experience
AI Tutor
xAI
Part-time ·Grok AI
Evaluated and annotated AI responses to improve accuracy, quality, and instruction following. Provided human feedback to enhance Grok’s language understanding and response generation.
Senior MuleSoft Developer
Viseo Asia
Full-time · Japan / APAC programs
Shopify and third-party integrations, Shiseido post-production, Razer design work, CI/CD, incident RCA, performance tuning, and release coordination.
Freelance MuleSoft Developer
Viseo Asia
Shiseido Japan & EMEA
Retail APIs on Anypoint Platform, Shopify connectivity, and SLA-bound troubleshooting before converting to full-time senior.
MuleSoft Developer
Collabera · Metropolitan Bank & Trust Co.
CDD department
API-led design in Design Center, fragments and libraries, MUnit, and SIT / UAT / PROD with the client DevOps team.
Associate Integration Consultant
Capgemini Philippines
Central Retail Group
Object Store caching, ActiveMQ/JMS, Scatter-Gather, MUnit, and Runtime Manager deployments.
Solutions / Backend Developer
PCCW Solutions
eMPF platform
Systems analysis, API specs, and Java / Spring / JPA / Hibernate backends from requirements through delivery.
Backend Developer
Collabera · Globe Fintech / GCash
Promotion domain
Promotion APIs on SOFABoot, Alipay, SOFAstack, White Castle, and ESB in an agile fintech team.
Software Engineer / Full Stack
INDRA Philippines
Water utilities · intern to full-time
VB.NET and SQL Server apps, then Java EE, Angular 4, Spring, and MySQL to replace legacy water-industry software. Mentored interns.
My Work
01
Technologies
Depth over logos
What I run in practice.
Integrate
Mule ESB 4Anypoint PlatformAPI ManagerRAMLMUnit
Build
Java / Java EESpring BootSOFABootC# / VB.NETAngularJPA / Hibernate
Move data
MySQLSQL ServerRabbitMQGoogle Pub/SubAWS messagingJSON / XML
Ship
GitCI/CDJUnit / MockitoAnypoint StudioIntelliJEclipse
How I ship
Tools that stay in the loop
The two environments I live in on integration work.
Anypoint Platform
Daily driver
Design Center for contracts and fragments, Studio for flows, API Manager for policies, Runtime Manager for deploy and health. Code reviews enforce MuleSoft standards before a release leaves the pipeline.
Design CenterStudioAPI ManagerMUnit
Java & Spring
Backend foundation
When the work is a service rather than a flow — GCash promotions, eMPF, water platforms — I still reach for Java, Spring, JPA, and REST, with JUnit/Mockito covering the same path MUnit covers on Mule.
Spring BootJPARESTJUnit
Interactive
How systems connect
Compare two connectivity models. Structure stays the same; only the wiring changes.
Consumers
Mobile
Portal
Partner
Glue
Map A
Map B
Map C
Experience
Channel APIs
Process
Orchestration
System
Canonical APIs
Records
CRM
ERP
Commerce
Dimension
Direct
Layered
Coupling
Tight — consumers talk to systems
Loose — consumers talk to contracts
Reuse
Low — each path is custom
High — layers are shared
Change
Fans out across every link
Stays in one layer
Fit
Few systems, short-lived links
Many consumers, long-lived platforms
In this model: Every new consumer needs its own mapping, errors, and SLAs.
Principles
How I treat integrations
Stability over heroics
Success is quiet production. Monitoring, RCA, and SLAs matter as much as the first deploy.
APIs as product
Contracts, fragments, tests, and docs are part of the build — not a cleanup pass after UAT.
Reuse through layers
Experience, Process, and System APIs keep channels from coupling to core systems.
Credentials
What sits behind the work
MuleSoft Certified Developer — Level 1
Anypoint development, flows, error handling, and API implementation standards I still apply in reviews.
BS Information Technology
Foundation for the intern-to-engineer path at INDRA and everything after.
years of experience
Years of experience integrating diverse applications across industries such as technology, retail, e-commerce, fintech, and banking.