Marco Diaz Android engineer · Payments leader · Staff DevEx
From hands-on Android and Kotlin delivery to Walmart payment journeys and enterprise AI enablement, I work where product quality meets developer experience.
Currently at Thermo Fisher Scientific, leading AI enablement and Developer Experience as a Staff Engineer.
Résumé PDF ↗
01 / SELECTED WORK
Examples from client delivery, product building and payment leadership.
CLIENT MOBILE · ANDROID / IOS
An Android-first banking prototype with reusable Compose components, accessibility work and testable delivery boundaries. Companion iOS UIKit work supported the same product direction.
I merged Android work across Home, shortcuts and payments, backed by unit/UI tests and TalkBack improvements.
INDEPENDENT PRODUCT · WEB / MOBILE
I built a live residential operations product spanning resident, guard and admin workflows, with QR access, offline-aware mobile work and auditable data flows.
Visit live product ↗PAYMENTS · ENGINEERING LEADERSHIP
I led mobile and backend teams across Walmart Pay, One Way to Pay, One Pay migration, Pay Over Time and multi-tender checkout work.
02 / THE BROADER ROLE
I build systems that make high-performing engineers faster without making the organization less safe.
From Android and Walmart payments to enterprise AI, my throughline is clear ownership, reusable workflows, strong release habits and human review at important gates.Reduce setup and handoff friction with clear defaults, templates and CI/CD guardrails.
Connect Codex, ChatGPT Enterprise, GitHub and Jira workflows to access controls, review gates and auditability.
Build ownership and release discipline across mobile, backend, product, risk and legal partners.
I look for evidence in onboarding time, build and pipeline reliability, review latency, flaky tests and useful adoption, beyond license counts.
03 / REUSABLE WORKSHOPS
Sessions built to be repeated by teams: practical exercises, facilitator notes, prompts, guardrails and a way to measure what changed.
A practical first build, planning and review workflow, packaged with repeatable facilitation materials.
Use real tickets and repository context to plan, implement, test and review changes with confidence.
A manager's view of rollout, governance, quality and useful adoption signals.
Choose measures for onboarding, CI, reliability and AI adoption, with clear confidence levels.
04 / EXPERIENCE
Staff Engineer in Developer Experience; AI enablement, enterprise tooling administration, governance and reusable engineering workflows.
Grew from Android and mobile engineering into payments engineering management across customer-facing mobile and backend programs.
Early Android delivery, production fixes, quality automation and client-facing product work.
05 / CONTACT
Open to conversations about Android and mobile contracting, payments, Developer Experience and practical AI enablement.