peter.ibuyat// backend engineer

Backend development,
architecturally aware, for distributed systems.

I’m Peter Ibuyat — a senior backend engineer with 10+ years shipping production systems across banking, government, healthcare, hospitality, and SaaS. I’m a developer first, with the architectural awareness to design services, workflows, and integrations that hold up in the real world.

View systemsContact
10+ yrs
engineering
Banking · Gov · Health
domains
.NET · C# · SQL
core stack
AWS · Supabase · PostgreSQL
cloud
01 — About

A developer who builds, ships, and runs the systems.

I’ve spent the last decade going deep on backend development — from VB.NET line-of-business systems in shipping and healthcare, to AWS-backed microservices in BPO, to banking integrations at Metrobank and ING. I’m a developer first, with the architectural awareness to make sensible decisions about service boundaries, data, and integration. I’m equally comfortable in C#, in SQL tuning windows, in CI/CD pipelines, and in the production logs at 2am.

My work tends to live where business logic meets infrastructure: integration layers between core banking systems, workflow engines with approval chains, multi-tenant portals with row-level security, and the operational tooling teams quietly depend on every day. I prefer writing the code, then letting the architecture emerge from real constraints — not the other way around.

I've led PH-based development teams, structured hiring, stood up CI/CD from scratch with bash, and contributed to DDD-based microservices on AWS. Outside of enterprise work I design and run member, volunteer, and event systems for churches and ministries — small in scope, real in production, and a great place to keep practicing pragmatic, hands-on engineering.

Currently
Solutions Architect, ING Hubs B.V. (Philippine Branch)
Previously
Metrobank, Tyler Technologies, Proposito, Prosource, EXL Services
Industries
Banking · Government · Healthcare · Hospitality · SaaS · Ministry
Core focus
Backend, distributed systems, integration, workflow architecture
Languages
C# / .NET · TypeScript · SQL · VB.NET · PHP · Bash
Based in
Philippines — distributed teams across PH, IN, US, EU
02 — Technical expertise

The stack I’ve actually shipped to production.

No buzzword bingo — these are tools, patterns, and platforms I’ve used to design, build, deploy, and operate real systems for banks, governments, and global SaaS products.

01

Languages & Runtimes

  • .NET / C#
  • VB.NET
  • TypeScript
  • JavaScript
  • SQL (T-SQL / PL/pgSQL)
  • PHP
  • Bash
02

Backend & Architecture

  • Distributed Systems
  • Microservices
  • Service-Oriented Architecture
  • API Architecture
  • Workflow Systems
  • Domain-Driven Design
  • System Design
  • Backend Scalability
03

Cloud, DevOps & Data

  • AWS
  • Supabase
  • CI/CD
  • DevOps
  • IIS
  • PostgreSQL
  • SQL Server
  • Edge Functions
  • Cloud Cost Optimization
04

Security & Access

  • Row-Level Security (RLS)
  • Role-Based Access Control
  • Banking-grade Compliance
  • Risk & Audit Alignment
05

Frontend & Client

  • Angular
  • WPF
  • MVVM
  • MVC
  • PWA
06

Practices

  • TDD
  • BDD
  • Agile / Scrum
  • Technical Leadership
  • Requirements Gathering
  • Solution Design
03 — Featured systems & projects

Real systems. Real production. Real tradeoffs.

A selection of work spanning banking, government, healthcare, hospitality, and enterprise operations. Each one is grounded in actual roles, stacks, and architecture decisions — not invented case studies.

01 / 08
Banking integration

Core banking integration & API platform

Architecture and integration design across core banking, APIs, and third-party services for a tier-1 PH bank and ING’s global banking environment. Focus on resilient, auditable, regulation-aware service boundaries.

  • Designed integration patterns aligned with risk and compliance frameworks
  • Coordinated with cross-functional, geographically distributed teams
  • Aligned architecture with digital-first transformation roadmaps
.NETC#SQL ServerREST APIsEnterprise Integration
02 / 08
Government / LGU

Local government product platform

Part of the platform team building products consumed by US local governments. Containerized development and deployment, predictable releases, and team-level technical leadership for the PH-based squad.

  • Led PH-based team, owning sprint delivery and tech mentorship
  • Standardized containerized dev and deploy workflows
  • Reduced cross-timezone friction with documented async patterns
AngularC# / .NETMSSQLCI/CD
03 / 08
Distributed backend

DDD microservices platform with bash-driven CI/CD

In-house platform built around Domain-Driven Design and microservices on AWS. CI/CD pipelines authored from scratch in bash, TDD + BDD workflows, and an MVVM/WPF operator client.

  • Hired and structured the PH dev team from scratch
  • Authored CI/CD pipelines and deployment automation
  • Established service boundaries around bounded contexts
C# / .NETAWSMicroservicesMVVMWPFTDD/BDDBash CI/CD
04 / 08
Automation / Healthcare-adjacent

End-to-end transaction automation bot

Spearheaded and led the first production implementation of a desktop bot that traverses multiple client systems and public domains, collates context into a single operator window, and executes transactions in one place.

  • Designed service architecture and database schema
  • Adapted tech per client environment (PH / IN / US teams)
  • Reduced operator context-switching across 5+ legacy systems
C# / .NETMSSQLAutomationCross-system integration
05 / 08
Enterprise modernization

Legacy VBScript → modern JavaScript migration

Part of a multi-shift, multicultural team migrating a deeply entrenched VBScript product to a modern JavaScript stack. Steep product learning curve, large surface area, careful behavioral parity.

  • Owned migration slices with behavior-preserving refactors
  • Worked across rotating shifts with US/PH collaboration
JavaScriptLegacy VBScriptEnterprise tooling
06 / 08
Operations / Internal platforms

Maritime operations platform — assets, procurement, payments, HR

Four interlocking internal systems for a maritime crewing operation: asset management, central procurement & online requisition, payments & check printing, and HR manpower recruitment. End-to-end from analysis through deployment, including data migration off legacy systems.

  • Designed approval workflows for requisition and recruitment
  • Investigated downtime, performance, and integration peculiarities
  • Made on-site infrastructure decisions alongside development
ASP.NET / MVCVB.NETWPFMySQLjQueryiTextSharp
07 / 08
Healthcare

Hospital information system deployment & billing front cashier

Deployed an open-source hospital information system into a client environment running on Ubuntu VMs, then built a PHP/PostgreSQL hospital billing front-cashier system that links into it.

  • Authored deployment bash scripts for server / VM provisioning
  • Designed cashier flow and billing data model
PHPPostgreSQLGNUHealthUbuntuBash
08 / 08
Hospitality

Cruise line e-refund system

Built an internal refund processing system end to end from requirements through UAT — including internal test scripts. Close contact with end-users throughout implementation and support.

  • Owned dev + test phases including UAT scripts
  • Worked directly with end-users on rollout and support
C# / .NETjQueryHTMLMSSQL
06 — Enterprise experience

A decade of shipping into production.

Roles where I architected, led, and built backend platforms in banking, government, healthcare, hospitality, and SaaS.

  1. Nov 2025 — Present

    Solutions Architect

    ING Hubs B.V. — Philippine Branch
    • Designing scalable, secure, high-performance banking solutions within a global financial services environment
    • Aligning architectures to ING’s enterprise strategy and digital-first transformation
    • Leading integration design across core banking platforms, APIs, and third-party services
    • Ensuring compliance with international banking regulations and risk frameworks
    • Collaborating across multicultural, geographically distributed teams
  2. May 2025 — Nov 2025

    Solutions Architect

    Metropolitan Bank and Trust Company (Metrobank)
    • Designed and implemented scalable, secure banking solutions
    • Created integration designs for core banking systems, APIs, and third-party platforms
    • Ensured compliance with banking regulations and risk practices
  3. Nov 2023 — May 2025

    Senior Software Engineer

    Tyler Technologies Philippines Inc.
    • Migrated legacy VBScript product surface to modern JavaScript
    • Operated on a multicultural team across rotating shifts
  4. Sep 2022 — Nov 2023

    Solutions Architect

    Proposito Software Pty. Ltd.
    • Developed an in-house system in SQL and C#/.NET
    • Used MVVM client architecture with WPF front-end
    • Coordinated developers and QAs across timezones and shifts
  5. Mar 2021 — Sep 2022

    Senior Software Engineer → Team Lead

    Tyler Technologies Philippines Inc.
    • Built products for US LGUs using Angular, C#/.NET, and MSSQL
    • Standardized containerized workflows for development and deployment
    • Led PH-based team, owning communication and delivery
  6. Oct 2019 — Mar 2021

    Technical Lead

    Prosource BPO
    • DDD + Microservices platform on AWS using C#/.NET and SQL
    • Authored bash-based CI/CD pipelines
    • Ran Agile with TDD and BDD; hired and structured the PH dev team
  7. Jul 2017 — Oct 2019

    Senior Executive → Assistant Manager (Automation & Robotics)

    EXL Services Inc.
    • Spearheaded creation and first implementation of MediAssist
    • Managed pipelines to VM servers and designed load balancers for client implementations
    • Led multicultural teams across PH, IN, and US time zones
  8. Mar 2017 — Jul 2017

    Application Engineer

    Star Cruises
    • Built E-Refund system end-to-end through UAT
    • Worked closely with end-users on rollout and support
  9. Feb 2015 — Mar 2017

    Solutions Developer

    Marlow Navigation Philippines Inc.
    • Asset, procurement, payments, and HR systems across ASP.NET, WPF, and MySQL
    • Owned performance investigation, downtime analysis, and on-site infrastructure decisions
  10. Jul 2014 — Jan 2015

    Developer

    iSeNs Asia Inc.
    • Deployed GNUHealth to client environments on Ubuntu VMs
    • Built a PHP/PostgreSQL hospital billing front cashier integrated with GNUHealth
07 — Ministry & community engineering

Production systems for churches, ministries, and community work.

A parallel body of work that keeps me practicing pragmatic architecture at human scale: small teams, real users, real reliability expectations — and very real budget constraints.

01

Church & member management systems

Multi-tenant member directories, family/household relationships, role-based permissions, and admin tooling — modeled with Supabase, RLS, and PostgreSQL.

02

Volunteer management & scheduling

Role-aware volunteer rosters, ministry scheduling, availability, and notification flows. Designed to be operated by non-technical leads, not engineers.

03

Training & enrollment platforms

Course catalogs, enrollment workflows, attendance, and progress tracking — structured around clear state machines and approval steps.

04

Workflow & approval systems

Reusable approval engines for requests, sign-ups, financial flows, and event coordination, with audit trails baked in from day one.

05

QR-based attendance kiosks

Edge-function-backed QR check-in for services, classes, and events. Low-bandwidth-friendly, with offline-tolerant client behavior.

06

PWA member portals

Installable PWA portals so members get an app-like experience without app store overhead — push notifications, offline-friendly views, lightweight payloads.

07

Event registration & broadcasting

Event registration flows, push notification infrastructure, and SMS broadcasting architecture for time-sensitive announcements at congregational scale.

08

Public ministry & event websites

SEO and OG metadata engineered properly, fast first paint, and minimal client JS. Built to be shareable, discoverable, and cheap to host.

09

No-code production systems

Several of these systems are designed and operated on No-code + Supabase, treated with the same production discipline as enterprise work: RLS, edge functions, observability, and cost-aware patterns.

08 — Contact

Let’s talk backend development or a real engineering problem.

I’m always open to conversations about backend development, integration work, workflow systems, and engineering leadership — whether for an enterprise team or a smaller-scale project.

Email
peter.ibuyat@gmail.com
Best for architecture conversations, opportunities, and collaboration.
Phone
+63 995 675 9956
Based in the Philippines · open to remote and distributed teams.
LinkedIn
Peter Ibuyat
Full work history, recommendations, and professional network.
© 2026 · Peter Ibuyat
Systems online · accepting new conversations