Hossein Abbasi

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

• Architected and delivered 4 next-gen handheld terminals; Integrated with POS Android app (Kotlin, Jetpack Compose) for faster, secure payments at 1M+ device scale; Go-to expert on card reader codebase/SDK.
• Led and coached a 7-engineer squad; Set technical direction; Accelerated delivery across critical projects.
• Orchestrated collaboration across 8+ teams and 2+ departments; Drove GraphQL-powered secure, high-performance payments; Influenced system architecture, APIs, and roadmap decisions; Code generation (Proto/OpenAPI); Ensured PCI-DSS compliant security; EMV/MCU integration; Managed key encryption.
• Code audits; LLM security reviews; Penetration testing; Observability with Datadog APM and Splunk; Led incident management and post-mortems.
• Built AI-powered internal tools on AWS Bedrock; Spec refinement; Wrote RFCs, technical documentation; Collaborated with senior stakeholders on planning; Presented trade-offs for timely market launches.

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

• Contributed to My PetSafe® Android (Kotlin, Jetpack, RxJava); Shaped technical direction and architecture; Code refactoring; Added accessibility support; Scalable design; Integrated Wear OS and Augmented Reality (AR).
• Mentored engineers through reviews, pairing, and documentation, Increased team productivity and code quality across international teams.

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

• Built and scaled SafeBoda Passenger and Driver Android apps (1M users); rewrote in Kotlin; Implemented CI/CD and automated testing for faster releases; Mentored team; Improved scalability and user satisfaction.

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

• Managed Sheypoor Android app development; Java to Kotlin; Integrated Jenkins CI/CD; Expanded features and engagement for millions of users daily; Improved code quality; unit testing, refactoring; Cross-functional teams.
• Mentored engineers; Technical growth; Agile, OKRs, pair programming, and team alignment; 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; Cross-functional collaboration for global clients in Canada; REST APIs, MySQL, message-driven Google Cloud Platform (GCP); Analytics and real-time features.
• Delivered major products: Taxi company platform, IoT-based insurance solution for connected cars, Advertisement SDK; Drove client growth, mentored engineers, consulted partners.

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

• End-to-end ownership of Android apps, AOSP-based Smart TVs, VoD and online shopping; Secure payments; NoSQL/Realm; Millions of users; Product-aligned delivery; Cross-functional collaboration; Agile delivery; Higher customer satisfaction.

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

• Android (Java) and analytics-driven initiatives; Havayar Industrial Group CRM (ASP.NET, C#, MVC); ShahreKhabar news app and other Java/CouchDB products; Market-driven delivery.

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

• Mobile and web solutions (Java, J2ME, Android, ASP.NET MVC, MSSQL), Aftab CRM SaaS, Zar Macaroon, Research Center, IKCO Sport Club; High uptime; Coding best practices; Efficient delivery.

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

• Core C#.NET modules; Design-pattern-driven refactoring; Improved code quality, performance, and release stability.