Hossain Khan

Senior Software Engineer | Android - Slack Technologies, Inc. (2021 - Present)

Joined Slack to help them to do what they do best! making working life simpler, more pleasant & fun, and more productive. 🙌

Did you know?

• Slack is a backronym and it stands for "Searchable Log of All Conversation and Knowledge".
• Every weekday, Slack surpasses one billion usage minutes.
• 9 hours is the time period an average user of Slack is signed in for.

Platform Lead Engineer | Android - Canada, eBay (2019 - 2021)

Joined kijiji Android team to accelerate mobile product development and enhance end user experience.

• Recently launched feature that allows users to review their buying or selling experience on Kijiji.
• Built feature that allows Ad-ops to run campaigns for different period of time.
• Held bi-weekly team meeting to keep everybody in the loop with industry standards and technologies that can help grow Kijiji and it's user base.
• Improved application crash free user session rate from 97.81% to 99.92%.
• Took initiative to create a proof of concept (PoC) for adding 🌗 dark mode support to the app.
• Improved code quality and engineering experience by taking following actions:
  • Enabled lint checks on CI build after creating a baseline.
  • Enabled Kotlin code formatting lint checks on CI build.
  • Resurrected UI Unit test on Firebase Test Lab and Jenkins using Android emulator.
  • Added new Jenkins job to distribute CI builds using Firebase App Distribution.
  • Took initiatives to introduce proper code dependency injection using Dagger2 library.
  • Advocated for using consistent MVP pattern for newly developed features
  • Introduced use of MVVM architecture pattern into project that allows engineers to use latest lifecycle aware AndroidX libraries.
  • Added technical wiki for newcomers on application architecture, best practices, development & PR process and so on.
  • Proactively worked with the team to reduce Tech-Debt in the project. Some of recent initiatives includes - decomissioning obsolete A/B tests, upgrade build tools, migrate to R8 obfuscation tools, project wide standardized JSON serilization, applying consistent UI for common components, and many more.
• Lead team to migrate app's API target level to Android 10, and currently working on targetting app to Android 11 to meet the Google's deadline of October 2021.
• Participated in the company-wide hackathon and was placed 3rd 🥉
• Participated in week long world-wide eBay Classifieds hackathon competing with 10 other teams consisting of members from 8+ countries. During COVID-19, our video conference like feature for classifieds seller to reduce in-person contact won the competition 🥇 that was selected by jury for most innovative, impactful and ready idea for current situation.

Did you know?

• Four out of five Canadians (82%) participated in the second-hand economy in 2018, fuelling a $27.3 billion second-hand economy that has grown in size annually since 2015.
• In 2018 alone, Canadians gave 2.4 billion items a second life - 250 million more items than in 2014.

Kijiji app on Google Play™

Sr. Android Engineer / Team Lead (Consultant) - Connected Inc. (2017 - 2018)

Created a complete solution for connected media device and a companion Android application to support device communication and media content discovery.

• Used Kotlin & MVVM architecture to implement application features.
• Added Realm for data caching and offline support.
• Met with customer on-site and collaborated with their engineering team on different features.
• Planned weekly sprint items and assigned resources among team.
• Provided technical support to team members and product managers.
• On boarded new hires and paired with them to ramp up on the project.
• Collaborated with other platform team leads to discuss and finalize design and architecture of different core-components.
• Reviewed code using GitHub and provided constructive feedback to be compliant with currently defined project standards.
• Worked with Product Manager to plan and execute monthly releases to Google Play store.
• Closely worked with QA team to address and clarify any application related issues
• Created “Developer's Guide” wiki for key components of the app, consistently encouraged other team members to contribute to it.

Key Accomplishments

• Successfully launched the feature complete companion Android app on time.
• Improved crash free user session from 92% to 99.2% by constantly analyzing data from Crashlytics.
• Reduced application size by 15% by using vector images and lightweight WebP image assets
• Reduced 8% background battery consumption on the application by using Android platform's JobScheduler.

Platform Lead | Android - dubdub Inc. (2016 - 2017)

• Worked with management to set priorities for upcoming releases and define stories accordingly
• Worked with UI/UX team to refine app experience
• Initiated weekly app improvement brainstorming meeting with the team and implemented material design patterns to make UX better.
• Supported QA team for various activities including UI test automation

Key Accomplishments

• Added automation script to reduce manual tasks that were required during day-to-day development.
• Improved code coverage by 7% for core components.

Sr. Android Engineer | Team Lead - dubdub Inc. (2016 - 2017)

• Worked with management to set priorities for upcoming releases and define stories accordingly
• Worked with UI/UX team to refine app experience
• Initiated weekly app improvement brainstorming meeting with the team and implemented material design patterns to make UX better.
• Supported QA team for various activities including UI test automation
• Architected android app using modern MVP pattern recommended by Google engineers. The pattern was strictly enforced among the team.
• Participated in project planning, estimation and provided valuable feedback. Distributed planned tasks among team members
• Participated in code review for features, bug fixes and other changes.
• Designed API and translated API specification using OpenAPI Specification standard; formerly known as Swagger 2.0. The OpenAPI Specification contract was later used to generate rest-client library respective platforms.
• Created wiki containing technical-guide, developers-guide, and release-guide for future reference.
• Maintained Google Play store release cycles for Alpha, Beta and Production channels.
• Setup continuous integration (CI) using BuddyBuild for each pull-request which builds dev, staging and production builds.
• Constantly refactored code base to adhere to DRY principle.
• Improved application's draw performance by reducing overdraw and optimizing view higherchy inside recycler view.

Key Accomplishments

• Used APK analyzer to analyze APK, and optimized large image assets using WebP reducing the size by 19mb, which resulted over 58% savings on APK size.
• Ran android lint tool, and reduced 36% of critical lint warning and errors for the project.
• Maintained unit tests and improved code-coverage by 8% for newly added features.
• Developed fully functional proof-of-concept Android TV(📺) app that uses same API and services for video content consumption.
• Added automation script to reduce manual tasks that were required during day-to-day development.

Sr. Android Engineer - QuickPlay Media (2015 - 2016)

Worked with R&D android development team for current and future products.

• Refactor and enhance existing library features, provide better solution where necessary.
• Provide and update documentation with each release.
• Build and maintain sample android application to showcase supported features.
• Write unit tests, review peer-code and provide input if applicable.

Android Engineer - QuickPlay Media(2012 - 2014)

• Managed, helped and guided team members to achieve sprint & project goals
• Participate in daily scrum meetings and provide updates
• Participate in development estimations for clients or PMs
• Improve code-base by constantly refactoring or re-using established open-source software
• Help different project on-demand, to fix production issue
• Trained new hires to work on existing projects
• Documented project standards and process in wiki
• Collaborated with different team to gather requirements and implementation details
• Worked on multiple PoC phase for different clients

Key Accomplishments

• Released android app for major Canadian carrier which has support for LIVE and VOD video streaming on-the-go for Android phone & tablet. The application has been optimized to run on set-top boxes and Android TV. It has 100,000 - 500,000 install from Google Play store.
• A live streaming application using propitiatory technology for a closed group of people. Worked with specific future devices that has this technology enabled.