Name the problem.Consider it handled.

Mark in Bangkok, Thailand
Mark's UPLB graduation, August 2022
Mark's 10th birthday celebration, August 2010

I'm Mark Nestor Arenillo.

I'm a software engineer and Cum Laude Computer Science graduate from the University of the Philippines Los Baños, based in Pasig City, Philippines.

I build things that solve real problems.

I don't build software just to make it work. I build it to make a difference for the people using it.

I understand the problem, challenge the obvious solution, and obsess over the details until it feels right.

Problem SolverProduct ThinkerDetail ObsessedBuilder

Works

GRRT

Redefining fitness, starting with your Dream Physique.

AI Dream PhysiqueGoal-Based WorkoutsAdaptive TrainingAI Meal ScanningAuto PR Tracking
Coming soonApp Store · October
Coming soonGoogle Play
ExperiencePuerto Galera
Bagong PilipinasMunicipality of Puerto Galera seal
Oriental Mindoro, Philippines

From the city
to the coast.

A little preparation makes room for the good part. Here’s how the journey comes together.

Metro Manila → Puerto GaleraArrival guide
Metro ManilaBatangas PortFerry crossingBalateroYour base
Visit site
03Coming soon

Anything under the sun, really.

Web AppsE-Commerce PlatformsMobile AppsAI-Powered ToolsBrand WebsiteBooking SystemsCRMPayment IntegrationsInternal DashboardsSaaS ProductsMarketplacesInventory SystemOrder Management SystemChatbotsREST APIsERPWorkflow AutomationTicket Request SystemInvoicing and Payment SystemReal-Time SystemsTimesheet SystemDesign SystemsWeb AppsE-Commerce PlatformsMobile AppsAI-Powered ToolsBrand WebsiteBooking SystemsCRMPayment IntegrationsInternal DashboardsSaaS ProductsMarketplacesInventory SystemOrder Management SystemChatbotsREST APIsERPWorkflow AutomationTicket Request SystemInvoicing and Payment SystemReal-Time SystemsTimesheet SystemDesign Systems
Web AppsE-Commerce PlatformsMobile AppsAI-Powered ToolsBrand WebsiteBooking SystemsCRMPayment IntegrationsInternal DashboardsSaaS ProductsMarketplacesInventory SystemOrder Management SystemChatbotsREST APIsERPWorkflow AutomationTicket Request SystemInvoicing and Payment SystemReal-Time SystemsTimesheet SystemDesign SystemsWeb AppsE-Commerce PlatformsMobile AppsAI-Powered ToolsBrand WebsiteBooking SystemsCRMPayment IntegrationsInternal DashboardsSaaS ProductsMarketplacesInventory SystemOrder Management SystemChatbotsREST APIsERPWorkflow AutomationTicket Request SystemInvoicing and Payment SystemReal-Time SystemsTimesheet SystemDesign Systems

Experience

Download my CV

Software Engineer

Jun 2025 — Present

EROAD

  • Build and maintain Dispatch Management integrations, keeping job flow reliable between third-party systems, EROAD 360, and Drive for enterprise construction customers.
  • Led the migration of ServiceBusToSNS from legacy Azure Functions to containerized workers on AKS, with end-to-end CI/CD via GitHub Actions.
  • Manage cloud infrastructure with Terraform and Kubernetes, including Service Bus resources, secrets, and decommissioning legacy VMs/Function Apps.
.NETC#AzureAKSTerraformGitHub ActionsKubernetes

Software Developer

May 2024 — Jun 2025

Tyler Technologies

  • Contributed to cloud migration efforts, converting a Windows app-based ERP Pro system to a cloud-based .NET solution.
  • Identified bottlenecks and optimized existing code, fixing technical debt for performance and scalability.
  • Facilitated and led code reviews and knowledge-sharing sessions across the team.
.NETC#Cloud MigrationCode Review

Software Engineer

Sep 2022 — May 2024

Nimbyx

  • Designed, developed, and tested web and mobile applications, software robots, and integration services.
  • Product-engineered web applications such as ALINA and Evident, collaborating with product owners as the business model evolved.
  • Drove continuous learning within the team and communicated project deliverables to stakeholders.
.NETC#ReactJSREST APIsSQL ServerRPA

Machine Learning Engineer

Mar 2022 — Sep 2022

Nimbyx

  • Trained machine learning models that automate the generation of dental restoration CAD designs.
  • Developed a CNN-based solution paired with the Meshmixer API to speed up manual dental crown design.
PythonTensorFlowCNNMeshmixer API

Skills

Languages & Frameworks

.NETC#ReactJSHTMLCSSJavaScriptTypeScriptPythonREST APIs

Cloud & DevOps

AzureAWS SNSKubernetesTerraformGitHub ActionsDatadog

Data & ML

SQL ServerTensorFlowMachine Learning

Bachelor's Degree in Computer Science

University of the Philippines Los Baños · Cum Laude · 2018 – 2022

Start a project
now.

Tell me what you're trying to build. I'll make it my problem to solve.

Pasig City, Philippines · reachable via WhatsApp, Viber, or text