Hossain Khan

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

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

Working with the Slack Platform Team to support over 1 million developers and 750,000+ apps that are used by millions of users every day.

Key responsibilities includes:

• Developing user-centric and intuitive app interfaces using Slack’s UI framework, Block Kit.
• Creating workflows and automations that streamline work processes and improve productivity using Slack’s Workflow Builder and App Home.
• Leveraging Slack’s developer tools and APIs to connect with various apps and services, such as Google Calendar, Salesforce, Zoom, and more.
• Testing, debugging, and deploying API updates for new Block Kit blocks and block elements.
• Collaborating with other developers and stakeholders using Slack’s channels, threads, actions, and shortcuts.

Key Accomplishments

• Actively participated in the Platform 2.0 initiative, specifically developed link trigger and shortcut implementation that allows customers to easily share and run 2.0 workflows from anywhere like channel, bookmarks, canvas and more.
• Worked on brand new "File Input" block element feature that allows users to use file as input in the Block Kit and Slack App realm.
• Organized recurring team mob sessions to improve code-base health and share knowledge among the team members.
• Authored over dozens of wiki content for the Android Block Kit team to preserve and share the knowledge across team and organization.

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.

Slack app on Google Play™

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 periods of time.
• Held bi-weekly team meeting to keep everyone 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 serialization, applying consistent UI for common components, and many more.
• Led team to migrate app's API target level to Android 10, and currently working on targeting the app to Android 11 to meet 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 the 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 the 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 the Android app using the 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 the 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 for 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.
• Set up 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 hierarchy 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 a 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
• Participated in daily scrum meetings and provide updates
• Participated in development estimations for clients or PMs
• Improve code-base by constantly refactoring or re-using established open-source software
• Helped different projects on-demand to fix production issues.
• 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 phones & tablets. 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 proprietary technology for a closed group of people. Worked with specific future devices that have this technology enabled.