Hossein Abbasi

Toast empowers restaurants with an all-in-one platform for POS, ordering, marketing, delivery, and payroll:

• Architected and delivered 4 next-generation payment terminals for POS Android app (Kotlin, Jetpack Compose, Material 3), scaling to 1M+ devices; optimized memory, minimized ANRs, leveraged Baseline Profiles, Macrobenchmarking, and profiling tools; served as the go-to expert for card reader SDKs.
• Led and coached a 7-engineer squad, providing technical leadership, mentoring on Android best practices, modern architecture patterns (MVVM/MVI), and accelerating delivery of scalable mobile solutions.
• Orchestrated collaboration across 8+ teams and 2+ departments, driving GraphQL-based secure payments; influenced system architecture, APIs, and roadmap; implemented static analysis and Paparazzi for UI testing; ensured PCI-DSS compliance, EMV/MCU integration, and encryption.
• Conducted code audits, LLM security reviews, penetration testing, and incident response; enhanced observability using Datadog APM, Splunk, and telemetry; led incident response and post-mortems.
• Built AI-powered internal tools on AWS Bedrock, refined specifications, authored RFCs and technical documentation, and partnered with senior stakeholders to evaluate trade-offs and meet market timelines.

Global leader in IoT solutions with brands like PetSafe®, Invisible Fence®, and SportDOG®, serving in 50+ countries:

• Contributed to a scalable My PetSafe® IoT Android app (Kotlin, Jetpack, RxJava, Coroutines, Flow); shaped technical direction and architecture, refactored legacy code, added accessibility support with optimized memory management, and integrated custom views, Wear OS, and Augmented Reality (AR).
• Mentored engineers through code reviews, pair programming, and documentation; boosted team productivity and code quality across international teams while adapting clean architecture.

Leading East African ride-hailing and delivery platform connecting 40,000+ trained riders with millions of customers:

• Built and scaled ride-hailing Passenger and Driver Android apps (rewritten in Kotlin) serving 1M+ users via modularization; establishing design system consistency; implemented CI/CD and automated testing for faster releases; mentored engineers, and improved scalability and user satisfaction.

One of the largest online classifieds marketplaces, enabling millions to buy, sell, and find goods and services:

• Contributed to Android app development, led migration from Java to Kotlin and integrated Jenkins CI/CD; expanded product features for 2M+ daily users while improving code quality through unit testing, static analysis, test-driven development (TDD), and refactoring in close collaboration with cross-functional teams.
• Mentored engineers on technical growth, Agile practices and OKRs, pair programming, and team alignment, driving rapid prototyping and delivery excellence.

Startup specializing in Android development with a distributed remote team, serving clients across globe:

• Led end-to-end Android and server-side development in collaboration with distributed remote teams for global clients in Canada; built REST APIs and MySQL-backed services, delivered a taxi platform, an IoT solution for connected cars, Ads SDK, and consulted partners.

A leading company in consumer electronics, home appliances, and smart devices:

• Development of Android apps and AOSP-based Smart TVs with VoD, online shopping, and secure payment features using NoSQL/Realm, supporting millions of users through cross-functional collaboration.

Startup co-founded, specializing in Android and CRM solutions for industrial and consumer markets:

• Developed analytics-driven Android (Java) initiatives, Havayar Industrial Group CRM (ASP.NET, C#, MVC), ShahreKhabar news app, and other Java/CouchDB products with a strong market-driven focus.

Software solutions provider specializing in mobile and enterprise applications for corporate and consumer markets:

• Delivered mobile and web apps (Java/Android, ASP.NET MVC, MSSQL), including Aftab CRM, Zar Macaroon, Research Center, and IKCO Sport Club, ensuring high uptime, strong engineering practices, and efficient delivery.

Financial software firm that developed the Parnian Accounting Windows application for enterprise clients:

• Contributed to C#.NET modules using design patterns, improving code quality and performance.