Khandker Mahmudur Rahman Email & Phone Number

Dhaka, Bangladesh

• Spearheading multiple in-house iOS application development• Cross-platform development using Flutter for seamless iOS and Android app deployment• Negotiating with Product Team, QA and other stakeholders• Managing App store submission• Understanding new features and slicing them down into manageable pieces and distributing them among team members.• Overhauling data synchronisation with Cloud service using GraphQL Client (Apollo).• Developed in App ASR Client by compiling Google Cloud’s Speech-To-Text (gRPC) service using protobuf

Dhaka, Bangladesh

I will be working with the Mobile platform team as Senior Staff Software Engineer. I will be contributing to their various Android and iOS projects targeting state-of-the-art smartphones and Google Glass-based product developments and research.Gradually I am taking ownership of different features of their in-house Android and iOS Applications.* Implemented Secured storage (using KeyStore) and integrated SSL pinning to increase the Android application security.* Implemented iOS App's DataChannel using Socket.io for Signaling and Realtime Messaging* Implemented iOS App's REST API services for Auth, App Settings, and other API requests* Implemented iOS app's Logentries service (cloud logging service) using TLS socket client* Designed and developed an iOS application that follows MVVM design pattern and clean architecture using RxSwift, Swinject* Implemented unit testing for iOS App using Mocker, Quick, Nimble, RxNimble* Planning with the dev team breaking down and analyzing Epic/Stories/Tasks/Bugs * Releasing app (AppStore/TestFlighjt)

Dhaka, Bangladesh

Dhaka, Bangladesh

It was a short but great journey. Being part of a large team made me more skilled and dynamic in project management. Not to mention the learning of AOSP development, which is a game-changer for me.I was given the responsibility of Architect for Android Team E (Division 4). It was a new team and the role was also more challenging.Key accomplishments:- Lead the team to implement a new Text-to-Text engine- Designed the new language mapping file to support legacy device- Designed and integrated new supported languages- Designed and provided assistance to the developers to develop a custom in-app keyboard.

Bangladesh

I joined Div4 (Android team D) as a lead developer remotely during the beginning of the COVID pandemic. It was a challenge for me to prove my dedication and passion to the team and I believe I had done an excellent there.Key accomplishments:- Implemented audio compression algorithm. This feature reduced up to 70% of mobile data cost. The client was really happy and excited with the performance and the cost minimization.- Managed to resolve critical issues that made some good impact on the product

28 Shahjalal Avenue | Sector-4 | Uttara | Dhaka | Bd.

Key accomplishments:- VPN Tunneling and VPN server/client application design- Developed server/client socket application using DTLS protocol- XMPP (IM) Application development and customizing Secure XMPP library for Android Platform- Amazon FireTV Stick (android) VPN client application

Dhaka, Bandladesh

Key accomplishments:- Ported and modified PJSUA2 C++ library using NDK to support Android application- Designed and developed VOIP SDK in Java for Android- Contributed to various custom VOIP Android application developments- Designed and developed the IAX2 client library (protocol layer) for the Android platform- Integrating Firebase Push notification service for both Android client and server-side (using python)- Ported audio codecs in Android using NDK (Speex, OPUS, GSM, codec2)- Developed a linux CLI application in python to invoke push notification for both iOS and Android. This service was used by SIP server to wake-up an Mobile app to receive incoming calls- Implement Firebase push notification in Android- Worked on Customizing POS firmware (DOT NET)

28 Shahjalal Avenue | Sector-4 | Uttara | Dhaka | Bd.

Key Accomplishments:- Programmed firmware for Aviation Grade Custom Hardware (Voice, Data, wireless application, drivers for embedded platform). This includes communicating with Satellite Modems using RS232 protocol, maintaining and managing data connection with clients over Wifi using TCP/UDP protocol.- Developed thread-safe event-based (epoll/poll/select) client-server applications using socket (TCP/UDP)- Ported and modified PJSIP C library using NDK to support Android application- Develop firmware for embedded hardware.- Implement core features in Linux based c/c++ applications- Work on customizing opensource libraries

Bangladesh

- Designed circuit board and developed firmware for RF-ID based production counter - Electronic Queue Management System. - RS232 and RS485 data communication modules. - GSM based Generator Monitoring system. - Attendance Management Software. - Microclimate Device with remote localized weather data logging. [Wind Speed, Wind Direction, Temperature, Humidity] - GSM GPS Tracker with AVR microcontroller. - Programming Bootloader for Embedded - Designed embedded circuit for controlling 3 phase motor (Nord) with Variable Frequency Driver (VFD) which is used in Dynamic Simulators (Car, Tank).

Bangladesh