Hasif Seyd Mohammed
Berlin,BE
Summary
Senior Android Engineer with 10+ years of experience building and optimizing large-scale production applications. Proven track record at Delivery Hero driving measurable performance improvements, including reducing WebView loading latency from 16s to 3s (P90) and cutting startup-related ANRs by 75%. Specialized in startup optimization, experimentation, observability, and system reliability across high-traffic logistics platforms. Strong expertise in Kotlin, Java, and performance-driven architecture design.
Overview
12
12
years of professional experience
Work History
Senior Software Engineer
Delivery Hero
Berlin
03.2022 - Current
- Reduced Customer Chat WebView loading time from 16s to 3s (P90) by designing and rolling out multiple WebView preloading experiments (asset warm-up, bridge pre-attachment, prefetching native APIs, Chromium optimizations), improving user-perceived E2E latency by ~80%.
Decreased Mapbox-related startup ANRs by ~75% by refactoring SDK initialization strategy, offloading heavy native .so loading from critical startup path, and introducing background initialization with controlled thread scheduling.
Led performance observability initiatives using Sentry, Firebase Crashlytics, and custom tracing, enabling device-class segmentation (high/mid-tier) and data-driven rollout decisions.
Designed and executed controlled A/B experiments across brands (Foodora, Foodpanda), validating performance gains across device tiers while maintaining ANR stability.
Deprecated legacy StateV2 architecture and migrated entire application to StateV3, reducing network latency by 40% and backend costs by 30%.
Developed turn-by-turn rider navigation by integrating Mapbox and HERE Maps, conducting 4-week A/B testing to optimize last-mile delivery efficiency.
Integrated face recognition authentication to prevent rider wage fraud and enhance operational security.
Senior Android Application Developer
Tata Consultancy Services
04.2018 - 02.2022
- Working in rewriting of Macys Shopping App into Multi-Module Clean Architecture, which has helped in decoupling features and hence helping in faster release and management of independent features . App Crashes has reduced to 70% by rewriting legacy code into Kotlin. Introduced Generic theming and style guides for app which has also reduced usage of duplicate resources in legacy app and hence reduced the app size by 20%.
- Worked in developing independent Payment Module for M&S that could be used across all store application and hence reducing deployment timeline of release by 50%
Senior Android Application Developer
Samsung Electro-Mechanics
10.2016 - 03.2018
- Designed and developed a real-time messaging and audio/video communication platform using XMPP and VoIP protocols for Samsung Manufacturing Division, enabling secure internal collaboration across plant operations.
Architected and implemented a plant-wide push notification infrastructure using MQTT for intranet-only environments (no external internet access), ensuring reliable low-latency message delivery within restricted network boundaries.
Built a cross-platform desktop client of the messaging system using Java Swing and OSGi modular architecture, maintaining feature parity with the Android application.Worked in Developing Audio/Video calling and chat messaging application using XmPP and VOIP protocols for Samsung Manufacturing Division which has helped employees to communicate with each other. - Established entire push Notification setup for Samsung Intranet application that has no internet access outside the Plant using MQTT protocol.
- Took ownership in building the same chat application for Windows Desktop app using Java Swing and OSGI architecture.
Android Framework and App Developer
Huawei Technologies India Pvt Ltd
12.2013 - 10.2016
- Worked in Customization of Various System application like System-UI, Settings, Contacts, SystemManager.
- Took Ownership of Launcher app customization and managed 5 member team.
- Worked in Developing Decoupling Module for Android that keeps base android framework and customization in separate modules which has reduced android system crashed by 60%
- Developed Indoor car navigation Application using Bluetooth Beacons as part of Huawei R&D project.
- Was part of Android Platform porting team which ported generic customizations done on previous platforms to new platforms and help increase deployment timeline by 30%.
Education
Bachelor of Science - Electronics And Communication
KMEA Engineering College
Cochin05.2013
Skills
- Android
- Android Framework
- Java
- Kotlin
- Git
- UI testing using Espresso
- Unit Testing
- Memory Management using Android Profiler
- Firebase tools
- Kotlin Multi platform
- React native
Accomplishments
- Awarded Best Developer for Month of April(2019) M&S for developing independent payment Module for their In-store Application.
- Awarded Best Developer for the Month of Oct 2018 in M&S e-commerce app.
- Got Award from Huawei for Best code expert in contributing in Huawei Indoor Navigation Application.
Timeline
Senior Software Engineer
Delivery Hero
03.2022 - Current
Senior Android Application Developer
Tata Consultancy Services
04.2018 - 02.2022
Senior Android Application Developer
Samsung Electro-Mechanics
10.2016 - 03.2018
Android Framework and App Developer
Huawei Technologies India Pvt Ltd
12.2013 - 10.2016
Bachelor of Science - Electronics And Communication
KMEA Engineering College