~/bpabatao

OPERATIONAL - 7 TENANTS · AWS · REMOTE (ITALY)

I build the platformother engineers ship on.

The Terraform that provisions a multi-tenant utility SaaS, the API it runs on, and the product customers use - built and operated end to end.

Open to Staff / Lead platform roles · Remote from Italy (CET), async-first · US and EU teams

8+
years in software
7
tenant portals
78%
core API v2 authorship
$110K/yr
AWS under management

Selected work

7 case studies · 7 portals · 15 more
also shipped (4)
Campaign Manager

Multi-channel notifications - Twilio SMS + IVR voice and AWS SES email with CSV lists and templated messaging.

CCS ↔ Invoice Cloud Sync

Batch pipeline syncing multi-account customers in 5K-record batches - idempotent, tracked, self-reporting.

Bedrock Knowledge Base

Pipeline converting Oracle CCS reference docs into LLM training data - validated JSONL to S3/Bedrock.

Tenant Go-Lives

Primary engineer on four tenant launches; core contributor on two.

earlier work (11)
Ordermentum Wholesale Food and Beverage Online Ordering System (opens in new tab)

Wholesale food and beverage ordering and payments platform (contract).

HCL Digital Experience Content Composer (opens in new tab)

Content authoring for the enterprise digital-experience platform - product features and test automation at scale.

HCL Digital Experience Design Studio (opens in new tab)

Page and layout design tooling for the enterprise digital-experience platform - product features and test automation at scale.

Hope Technik (opens in new tab)

Click-and-collect AGV system - IoT mobile app driving a robotic arm to fetch shop supplies, with a web tracker for job completion (React, React Native, Python).

Soon Beng Huat Metal and Hardware Trading

Web application for buying and selling metal scrap (React, Express).

Bambini International (opens in new tab)

Photography, franchise and services web platform - portrait studio site and booking (React, Express).

CoDev Internal Portal

Talent recruitment and management portal.

Kickstart Express

Package delivery mobile and web app for customers and riders, published on Google Play (Ionic, Adonis, AWS, Socket.io).

Luckyah

E-commerce marketplace app with raffles, messaging and a wallet on Android and iOS, published on Google Play (Ionic, Adonis, Socket.io).

Sobida

Offline truck-delivery report mobile app (Ionic, SQLite).

Experience

2017 - present
May 2023 - Present
New York, USA (Remote)

Staff Software Engineer, Platform & Product

ESC Partners / HometownHUB
  • Staff Software Engineer, Platform & Product · Sep 2025 - Present
  • Senior Full-Stack Engineer (Cloud) · May 2023 - Aug 2025
  • De-facto technical lead of a 5-engineer team, reporting to the COO/CEO: set the standards the fleet adopts, specify the CCS-side (IWS) changes the vendor team implements, own the team's AWS access as Terraform.
  • Own ~$110K/yr of AWS across the production and test fleet - CI/CD, Datadog/CloudWatch observability, and FinOps tooling driving right-sizing and Fargate-Spot savings.
  • Owned production go-live readiness for 6 client launches.
  • Primary author of both generations of the fleet's core API - 58% of v1, serving all seven launched tenants; 78% of v2, in production for the first ahead of its cutover - and the auth and Oracle CCS patterns both share.
  • Primary author (93%) of the internal developer platform: a Terraform control-plane (9 stacks, ~60 AWS resource types) with a Fastify/React dashboard, onto which the fleet's provisioning is migrating tenant by tenant.
  • Rolled blocking Snyk gates across the portal pipelines, then keyless OIDC deploys - pilot, test envs, prod on 4 repositories - taking long-lived AWS credentials out of the deploy path.
  • Shipped the fix for an SSN identity-verification gap enabling account takeover - wrong-person matches on ~2.4% of one tenant's accounts - as attempt lockout plus ZIP disambiguation, flag-gated for per-tenant rollout.
  • Built a fleet-wide customer-interaction audit trail: tenant-scoped, IDOR-safe admin history API with CSV export and rate limiting, 90-day retention, later extended to admin reads and impersonated sessions.
  • Built and measured the team's AI tooling: kept the Claude PR reviewer on the core API and backend, shelved the Bedrock auto-fix on evidence, shipped the knowledge-base agent.
  • Designed and shipped a multi-account usage-extract feature (backend API + frontend modal) letting multi-account customers export combined billed usage as one CSV, closing an admin-bypass IDOR gap found in review.
TypeScript · Fastify · React · Terraform · AWS · MongoDB · Oracle CCS
Mar 2024 - Present
London, UK (Remote)

Senior Full Stack Engineer

Nmblr
  • One of 3 core engineers on an ISO 27001-certified biopharma strategy SaaS in private beta with enterprise pharma clients.
  • Originated two subsystems from scratch: a DMMF-driven strategy clone engine and the Edge archive/restore isolation system.
  • Contributed to real-time collaboration (GraphQL subscriptions), OpenAI-backed generation features, and platform security (OWASP/IDOR, JWT sessions).
  • Originated a data-dependency subsystem - GraphQL contract, resolver, registry-driven modal - that warns before archiving or deleting finalised entities with dependents, then cascades the archive/restore across them.
  • Built out the Edge brand-strategy module - Belief Shift, Narrative, and competitive-landscape recap tabs with per-group finalise - and instrumented its LLM-backed prompt generation with llm_event telemetry.
React · TypeScript · Node · GraphQL · Prisma · PostgreSQL · AWS
earlier roles (6)
Mar 2022 - May 2023
Senior Software Engineer - CoDev. Agency engineer: built the internal talent-management portal, then embedded with client BaseMap on GIS hunting and fishing map features for a consumer GPS platform.
Sep 2022 - Mar 2023
Full Stack Software Engineer - Ordermentum. Restaurant ordering and payment management for hospitality clients.
Feb 2020 - Apr 2022
Senior Software Engineer II - HCL Technologies. Product features at scale on HCL DX; automated test suites; led code reviews.
Mar 2019 - Feb 2020
Full Stack Developer - Zencomputes. Full-stack development, Singapore.
Mar 2018 - Mar 2019
Mobile Application Developer - Halcyon Digital Media Design. Mobile applications, Philippines.
Nov 2017 - Mar 2018
Software Developer Internship - 8Layer Technologies. Software development internship.
2014 - 2018
BS Information Technology - Polytechnic University of the Philippines

Operating principles

how the work gets done

Boring, proven tech.

Clever is what someone decodes at 3am. Standard library before a dependency, a dependency before a framework.

Root cause, not symptom.

Bugs get reproduced end to end before they get fixed. One guard in the shared path beats a patch in every caller.

Security is the default.

Every endpoint ships with authorization checks. IDOR is assumed possible until proven otherwise.

Smallest change that works.

Tight scope, flagged adjacencies, verified before commit. The best code is the code never written.

Capabilities

cloud → frontend

Cloud & Infra

  • AWS - ECS Fargate, CloudFront, Cognito, RDS, ElastiCache, KMS, Secrets Manager, WAFv2, SES, S3, Route 53, VPC, ALB, Elastic Beanstalk
  • Terraform
  • Docker · Kubernetes
  • Linux · OpenSearch

Platform & DevOps

  • Internal Developer Platform
  • Multi-tenant provisioning
  • Bitbucket Pipelines · GitHub Actions
  • FinOps - Cost Explorer

AI on the Platform

  • AWS Bedrock (Claude)
  • AIOps auto-remediation
  • Agentic SDLC pipelines
  • AI code review · LLM knowledge bases

Backend & Data

  • Node.js - Fastify, Express
  • TypeScript · Python
  • REST APIs · GraphQL · Prisma
  • PostgreSQL · MongoDB · Redis/BullMQ
  • Oracle Utilities CCS · Invoice Cloud

Observability & Security

  • Datadog RUM/APM · CloudWatch · Sentry
  • Structured logging
  • OWASP/IDOR · JWT · WAFv2 · Snyk

Frontend

  • React · Redux
  • TypeScript
  • Styled Components · Tailwind
  • Next.js

Contact

async-first · CET

ACCEPTING- STAFF/LEAD PLATFORM ROLES · CONSULTING · AWS / TERRAFORM / MULTI-TENANT

jajapabatao@gmail.com