Lead Product Engineer
Polar Peer is building a distributed network that runs AI inference on GPUs contributed by independent node operators.
Back to PortfolioSep 2026 – Present Aug 2026 – Present Sep 2024 – Aug 2026 May 2019 – Present Sep 2026 – Present Aug 2026 – Present Sep 2024 – Aug 2026 May 2019 – Present
Summary
Software engineer with 7 years of shipping software: freelance delivery for Philippine SMEs since 2019 and full-time enterprise engineering since 2024. Deliver production systems across Java-based platforms, React and TypeScript front ends, and Python, Node.js, and Scala services on AWS. Strongest at tracing defects to their root cause across service boundaries, making architecture decisions with clear tradeoffs, and raising team standards through code review, mentoring, and postmortems.
Experience
Filter by skill
Senior Backend Engineer
Enterprise learning and content publishing platform, US client, engagement under NDA.
Software Engineer
Case management platform for a Southeast Asian government agency.
Freelance Full-Stack and AI Engineer
Polar Peer
Polar Peer is building a distributed network that runs AI inference on GPUs contributed by independent node operators.
Lead Product Engineer
Current- Lead the MVP from plan to release: scope, user journeys, release gates and the decisions that unblock each stage.
- Built the operator console and developer portal (React, TypeScript, Vite): component library, design tokens, a streaming chat playground, and accessibility checked with VoiceOver and in real Safari.
- Back every release with 1,000+ unit tests and 400+ end-to-end tests, run in Chromium, Firefox and WebKit plus a mobile profile.
- Drive a contract-first API: an OpenAPI spec with contract tests, so frontend and backend build in parallel.
- Shape the Rust core with the founders: clearer module boundaries, stronger tests and steady technical-debt paydown.
- Research the mathematics behind the network: scheduling, reputation and trust models, and verifying work done on hardware the network doesn't control.
- Designed privacy-first observability for the node fleet: OpenTelemetry into Grafana Loki and Jaeger, with IPs, credentials and user content redacted before anything leaves a machine.
- Ran an end-to-end technical assessment of the platform and turned it into a prioritised roadmap.
- Set the engineering bar across a team spread over several countries: CI quality gates, small reviewable pull requests and test-first bug fixes.
Stack: Rust (Tokio, axum), NATS JetStream, OpenTelemetry, Grafana, Loki, Jaeger, Docker, Helm, React, TypeScript, Vite, Tauri
CoDev (Complete Development)
Enterprise learning and content publishing platform, US client, engagement under NDA.
Cebu City
Senior Backend Engineer
Current- Contributed to 115 of the platform’s 350 repositories across reader, authoring, admin, and platform services on AWS.
- Led retirement of a legacy Python 2 service, migrating 14 background job types to TypeScript on AWS with zero data loss.
- Designed the replacement feature-flag architecture for a deprecated configuration service, wrote the migration RFC reviewed by 3 teams, and led migration of 11 services and 60 flags with no customer-facing regressions.
- Introduced a design-doc and RFC review process for cross-repository changes, adopted by the team and used for 12 designs.
- Delivered a critical feature-flagged accessibility epic across three apps nine days ahead of the quarterly deadline, with recorded tradeoffs: a per-organisation kill switch, cross-domain settings via a first-party cookie, and no integrity hash on a mutable vendor loader so a vendor update could not cause an outage.
- Before a product-wide rollout, found the third-party accessibility script could read every input, including login and password reset pages; a three-page findings report and live demo scoped the rollout to non-sensitive pages.
- Found leaked build credentials and authored the remediation epic: secrets moved to GitHub Secrets, test credentials consolidated in 1Password, deployment flows documented, and a follow-up security review.
- Diagnosed 282 duplicated CSS overrides across 8 repositories behind a defect class hidden for seven months, and authored the remediation epic with five sized stories and a lint rule so it cannot recur.
- In code review, caught a change that would have locked every partner integration out of authentication. Reviewed 56 pull requests and merged 51 across 12 codebases in the first month.
- Fixed silent data loss in an event pipeline by chunking Kinesis writes at the 500-record service limit, applied once at the shared call site, and stopped a cache from serving incomplete data after a live diagnosis disproved the working theory.
- Member of the production on-call rotation; resolved 20 incidents and wrote 3 postmortems.
- Built engineering documentation for 64 repositories, 38 reviewed and approved, and introduced agent-driven browser testing through a Playwright MCP setup with Firefox and WebKit automation alongside Chrome.
- Worked across three generations of the stack: React and Redux alongside legacy Backbone.js, Handlebars, and Django templates; Node.js/Express and TypeScript; Python in Tornado and Django; and a Scala Play identity service on the JVM.
Engagement stack: TypeScript, JavaScript, Python, Scala, HTML, CSS/SCSS | React, Redux, Backbone.js, Handlebars, Django templates | Node.js/Express, Tornado, Django, Play Framework | Elasticsearch, Redis, PostgreSQL, AWS Kinesis, Lambda, SQS, Step Functions | Jest, pytest, Playwright, ESLint, Stylelint | Docker, Kubernetes (Helm, Argo CD), Jenkins, Terraform, GitHub Actions
Accenture
Case management platform for a Southeast Asian government agency.
Cebu City
Software Engineer
- Designed and owned the Playwright end-to-end test harness, cutting QA cycle time by 40 percent through deterministic browser automation.
- Ran a daily unblocking and code review session with three teammates, teaching patterns alongside fixes to lift consistency across the team.
- Built modules of a Java-based enterprise case management platform with deterministic state transitions, SLA-driven routing, and decision rules across multi-stage workflows.
- Built a REST integration layer calling external APIs and normalising responses into internal data models.
- Set up EC2 and Lambda infrastructure and schedulers on the project’s AWS side, sharing networking knowledge from a CCNA background.
Self-employed
Freelance Full-Stack and AI Engineer
Current- Delivered web and mobile applications for Philippine SMEs in React, Next.js, TypeScript, React Native, Java, Node.js, and Python with PostgreSQL, owning architecture, API contracts, data models, and post-launch support on tight budgets.
- Integrated AI features using the Anthropic Claude API with multi-layer prompts, guardrails, and structured outputs.
Projects
Professor Basil's Lab
Next.js · React · TypeScript · Rust/WASM · PeerJS
- Browser battle simulator with peer-to-peer multiplayer and a multi-architecture emulator via WebAssembly and WebGL; Rust/WASM save parser with XOR decryption and bit-packed extraction, covered by 63 Rust and 20 JS tests.
STH-Sim Cebu
Next.js · TypeScript · Rust/WASM · WebGL2 · Web Workers
- Agent-based epidemiological simulation of parasite transmission across Cebu barangays, calibrated against medical thesis data, with a WebGL2 instanced renderer.
Open Source (npm)
TypeScript · Node.js · Playwright
- Playwright Archaeologist (crawls apps, maps selectors, generates E2E tests), auditfix (security audit remediation), dev-savestate (dev environment snapshots).