Patrick Maltagliati | Staff Software Engineer

Profile

Engineering leadership grounded in systems thinking.

Staff Software Engineer with 12+ years of experience building mobile platforms and distributed systems powering point-of-sale checkout and payments at scale. Expertise across iOS, distributed architecture, and reliability engineering, with a track record of driving cross-platform system design and executing complex multi-year migrations. Played a key role in migrating Square’s in-person checkout stack from legacy Bills infrastructure to Orders, implementing core client systems and influencing architectural direction to improve reliability, enable offline transaction recovery, and support mission-critical payment flows used by millions of sellers.

12+ Years building production software

$300M+ Monthly POS transactions supported while at Square

Reliability Cross-platform architecture leadership

Projects

Selected hands-on work beyond the resume.

Passkey Auth Demo

SwiftNIO authentication service with Apple-platform and web demos

Personal Project

Built an end-to-end authentication demo centered on passkeys and WebAuthn, combining a SwiftNIO backend, JWT issuance, DynamoDB-backed persistence, and client demos for both macOS and the web.

The project includes passkey registration and authentication flows, a reusable SwiftUI AuthKit package for Apple platforms, a static browser sample, and AWS deployment guidance for ECS Fargate.

Implemented registration and authentication endpoints for passkey flows in a SwiftNIO HTTP service.
Issued JWTs after successful authentication and exposed authenticated API access via a /me endpoint.
Modeled durable credential and challenge storage with DynamoDB for deployable cloud persistence.
Built both a macOS demo app and a static web demo to exercise the same auth flow across platforms.

View live demo GitHub project

Work Experience

Selected roles and platform work.

Block

Staff Software Engineer (L6)

Jan 2021 - Feb 2026

Drove development of shared checkout frameworks powering Square POS clients, standardizing cart construction, order state management, and checkout orchestration across high-traffic, revenue-critical flows.

Played a key role in migrating Square’s in-person checkout stack from the legacy Bills infrastructure to the Orders platform, implementing core client systems and influencing cross-platform architectural direction across iOS, Android, and backend services.
Designed and implemented offline-first order and payment state management systems, including local persistence, retry orchestration, and backend reconciliation to safely recover transactions during network outages.
Improved checkout reliability through architectural contributions, rollout strategies, and observability enhancements, reducing production regressions and increasing successful checkout performance against SLO targets.
Contributed to platform evolution enabling new payment flows and merchant use cases across Square POS, supporting systems used by millions of sellers.
Provided staff-level technical leadership through architecture reviews, cross- team collaboration, mentorship, and contributions to hiring and promotion decisions.

Emerson Electric

Software Engineer

Jun 2018 - Dec 2020

Led development and long-term maintenance of the Sensi thermostat mobile app on iOS and Android while improving architecture and release reliability.

Guided mobile coding standards and architecture to improve flexibility, testability, and long-term maintainability.
Built CI/CD pipelines supporting frequent, stable App Store releases with continuous delivery.

WWT Asynchrony Labs

Software Engineer

Sep 2015 - Jun 2018

Delivered production mobile applications for clients across multiple industries while applying disciplined engineering practices.

Championed Extreme Programming practices including TDD and pair programming.

Cerner Corporation

Software Engineer

Aug 2013 - Sep 2015

Built cloud-backed applications, including iOS components for physician-facing mobile products.

Skills

What I bring to a platform-heavy engineering team.

Technical Leadership

Cross-team influence, architecture reviews, mentorship, hiring, talent evaluation

Distributed Systems & Backend

Java, client–server architecture, data modeling, offline synchronization

Reliability & Operations

Incident response, observability, metrics, rollouts, migrations, release reliability

Platform & Architecture

Modularization, shared frameworks, API design, dependency management

iOS

Swift, Objective-C, UIKit, SwiftUI, Core Data, data persistence, concurrency, performance profiling, automated testing

AWS

S3, EC2, CloudFront, Route53, ACM, Secrets Manager, IAM, DynamoDB, ECR, ECS

AI

AI native development, prompt engineering

Education

University of Missouri

2009 - 2013

B.S. Computer Science

Contact

Let’s connect.

314.412.4235 patmalt@gmail.com

Based in Kirkwood, Missouri

GitHub @patmalt LinkedIn