Client Work and Industry Experience

Evidence behind the engineering claims.

Codefrost combines recent client software work with Mamerto Fabian Jr.'s engineering experience in operationally important systems. The sections below keep those categories separate.

Codefrost Client Work

Commercial work delivered through Codefrost or recent independent practice

Manatal Coop

Modernizing Member Operations for a Philippine Cooperative

Codefrost-supported member operations software, practical organizational AI training, and ongoing support covering member applications, registration workflows, communications, integrations, maintenance, and a public website connected to existing application content.

Get Manatal Coop Member App on Google Play Get Manatal Coop Member App on the App Store
  • Member application and service workflows
  • General Assembly registration support
  • SMS integration and communication features
  • Practical AI training covering day-to-day use, prompting, privacy awareness, and guardrails
  • Ongoing maintenance and managed support
Cooperative operationsMembership systemsAI adoptionCommunications

Adverio

Long-Term Advertising Technology Engineering Partnership

Sustained engineering partnership for an advertising-technology company, covering internal platforms, automation, data-intensive operational tools, e-commerce integrations, AI-assisted workflows, and production infrastructure.

  • Internal platform and operational tooling
  • Automation and monitoring responsibilities
  • E-commerce and data-heavy workflow support
  • Embedded collaboration with product and technical leadership
Advertising technologyE-commerceProduction infrastructure

UseDelight

Browser-Based SaaS Product and Platform Support

Product development and production support for a browser-based SaaS platform, including extension functionality, authentication, subscriptions, analytics, backend services, campaigns, and content/platform work.

  • Browser extension functionality
  • Authentication and subscription handling
  • User analytics and campaign support
  • Backend operations and ongoing production support
SaaSBrowser extensionsSubscriptions

HL7 Australia

Membership Platform Development for a Health-Interoperability Organization

Long-term development and support for a national health-interoperability organization membership platform, including member records, renewals, administrative workflows, and system transition work.

  • Membership records and renewal workflows
  • Administrative workflow support
  • System transition work
  • Long-lived support relationship
Health interoperabilityMembership systemsAssociations
Read the case studies Architecture and decisions behind three production AI systems

Industries and Systems Experience

Domains and system types represented by client work and earlier roles

Banking operations

  • check-clearing reporting
  • HR, payroll, leaves, timekeeping, and employee information
  • fixed-asset tracking, depreciation, and transfer history
  • internal FTP automation and integrations
  • PABX monitoring
  • bank website implementation

Mamerto prior professional experience

Smart cards and mobile-card systems

  • business-level integration interfaces
  • low-level integration interfaces
  • mobile Java applet software

Mamerto prior professional experience

Engineering and construction operations

  • construction-management systems
  • welding-control systems
  • field-change workflows
  • material-control systems

Mamerto prior professional experience

Online gaming platforms

  • service-oriented architecture
  • production sprint delivery
  • testing and deployment workflows

Mamerto prior professional experience

Health and membership organizations

  • membership records
  • renewals
  • administrative workflows
  • system transitions

Codefrost client work

Cooperatives and member operations

  • member applications
  • registrations
  • SMS communications
  • public content connected to operational systems

Codefrost client work

SaaS, advertising technology, and e-commerce

  • subscriptions and payment integrations
  • backend services
  • internal automation
  • analytics and campaigns
  • data-intensive operational tools

Codefrost client work

AI-native development workflows

  • MAID Runner manifest-backed agent delivery
  • repository instructions and validation loops
  • red evidence, behavioral tests, review gates, and Outcome records

Codefrost product and service work

AI-built application production readiness

  • ADC Fix production-readiness methodology
  • Evidence-backed application review
  • AI-built application remediation planning
  • security, data, launch-risk, and maintainability review loops

Codefrost product and service work

Mamerto's Engineering Experience Timeline

Career foundation, independent consulting, and Codefrost today kept distinct

Career foundation

2001–2004

Early enterprise software

Programmer at HRD (S) Pte., Ltd.

  • House-plan data entry software using MS Access, VBA, and Oracle
  • Utility applications built with Visual Basic 6

2004–2005

Banking systems

Programmer / Systems Analyst at Luzon Development Bank.

  • Banking operations and internal business systems used by departments and branches
  • Check-clearing reporting, HR/payroll/timekeeping, depreciation, integrations, PABX monitoring, and website work

2005

Smart-card software

Software development at Oberthur Card Systems.

  • Business-level and low-level integration interfaces
  • Mobile Java applet software for card/mobile systems

Sep 2005–Mar 2014

Engineering and construction operations

Nearly nine years with a JGC affiliate.

  • Construction-management, welding-control, field-change, and material-control systems
  • Operational software for internationally coordinated engineering work

Mar 2014–Jun 2014

Online gaming platforms

Senior development work on a Betsson Group product.

  • Service-oriented architecture
  • Testing, deployment, and recurring production sprint delivery

Jun 2014–Apr 2018

Amazon seller SaaS

Senior .NET Developer at eComEngine, LLC.

  • Full-stack development and maintenance of a SaaS product for Amazon merchants
  • C#, ServiceStack, AngularJS, and SQL Server delivery in an agile team

Independent consulting

Apr 2018–Present

Independent consulting and SaaS

Independent product engineering and client delivery before and alongside Codefrost.

  • SaaS subscriptions, payments, administrative tooling, browser-extension products, and operational handoff
  • Long-term support relationships for membership, cooperative, and business platforms

Codefrost today

Oct 2022–Present

Codefrost and AI-native software

Founder and principal architect for Codefrost products and services.

  • AI-native tools including Bolt to GitHub, MAID Runner, ArchSpec, and ADC Fix
  • Production-readiness, workflow engineering, modernization, and client software support

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