Work History
Hello! I am Debabrata Bhattacharya. Welcome to my work history page.
Here is a link to my portfolio page. And here's a link back to my projects page.
But first, a little about me!
Summary
I am a Software Engineer with experience developing Java, Python, Android, and JavaScript applications. I can develop, integrate, and deploy AWS services. I can also train and deploy Machine Learning models in Python.
Sections
Work history: 6 months of professional experience
Here's a summary of my work history. I have 6 months of professional work experience as a freelance developer. Please respect that employer names are withheld in most cases due to client confidentiality agreements in my contracts.
Below work history is in reverse chronological order (newest first).
Client: Data driven job matching startup [Name withheld for client confidentiality]
Hired for: Android development work
- Developed Android screens, according to client input.
- Handed over project to team.
Technologies used: Kotlin, Room, Retrofit
Time: 6 Weeks (February 2021 - March 2021)
Client: New-to-market, data driven Fintech Startup [Name withheld for client confidentiality]
Hired for: Developing a consumer facing Android app, and developing AWS backend services to support the app and fulfill other business requirements. All from scratch.
- Designed and developed Java Android app with respect to client business requirements.
- Developed authentication, data storage, and certain business functionality using API calls for said app.
- Developed and deployed serverless Amazon Web Services backend with Amplify, DynamoDB, API Gateway, S3, and Lambda.
Technologies used: Java, Android SDK and Google APIs, AWS Amplify, AWS DynamoDB, AWS S3, AWS Lambda
Time: 4 Weeks (December 2020 - January 2021)
Hired for: I was hired for 2 contracts. Initially, I worked with a team for maintenance and development of internal Django websites, and Flask APIs. They really liked my work, and after working on maintenance of some Java serverless functions, I was rehired. I then worked with another team on maintenance of Python serverless functions with AWS Lambda, and Flask APIs
Contract 1
- Maintained internal Django apps and Flask APIs by debugging and refactoring code, writing tests, and creating and rewriting documentation.
- Developed 3 internal Django apps, that accelerated internal processes related to documentation, messaging, and other related business functionality.
- Created test suites for each site using
Pytest , making sure that all behavior and functionality of each app is completely covered whenever necessary.
- Delivered projects one week before deadline, which saved development time for client. They really liked it.
- Worked for another team on maintenance of Java serverless functions on AWS Lambda, which led me to be rehired for another contract.
Technologies used: Python, Flask, Django, Java, AWS Lambda, Pytest, CSS, HTML
Contract 2: Support team engineer
- Maintained AWS Lambda functions composed of Python using
Boto3 library by debugging, documenting, and writing tests
- Improved logging functionality, which led to easier analytics and monitoring
- Increased unit test coverage of Python code using
Pytest from 50% to 95%
- Maintained Flask APIs by debugging, documenting, and writing tests
Technologies used: Python, Flask, Boto3, AWS Lambda, AWS S3, Pytest
Time: 3 months (September 2020 - December 2020)
Client: Startup Financial services company [Name withheld for client confidentiality]
Hired for: Developing an internal survey and documentation Android app, and integrating it with APIs. I was re-hired to work on maintenance of AWS EC2 instances and Python services
Contract 1: App development
- Developed Java Android app with respect to client business requirements.
- Integrated functionality by querying API calls for said app.
- Reduced development time by more than 50% by re-engineering app architecture several times with client input.
- Delivered Android app within 2 weeks instead of the estimated 6.
- Created detailed documentation and handed over project to team.
Technologies used: Java, Android SDK, Retrofit, Room
Contract 2: Maintenance of AWS EC2 instances and python services
- Created GitHub issues from bug reports.
- Categorized bug reports according to given metrics.
- Deployed, maintained, documented and debugged issues with a fleet of EC2 instances according to AWS and client documentation.
- Maintained, documented, and debugged Python services running on EC2 instances, some of which connected to PostgreSQL and MySQL servers.
- Refactored and added tests using
unittest framework.
Technologies used: AWS EC2, Python, GitHub, MySQL, PostgreSQL, unittest
Time: 5 weeks (August 2020 - September 2020)
Client: Housing and housing finance services company [Name withheld for client confidentiality]
Hired for: Developing an internal Android app to enable field team to document data quickly, and integrating it with APIs from a Spring server.
- Designed and developed Java Android app with respect to client business requirements.
- Developed image capture functionality using
ImagePicker to capture images easily, which reduced development time.
- Developed functionality to send form and image data to server using
Retrofit 2.0 library.
- Re-designed certain screens using client input to provide better UX functionality.
- Used TDD and Agile methodologies.
- Created documentation and handed off project to client.
Technologies used: Java, Android SDK, Retrofit, ImagePicker
Time: 2 weeks (July 2020)
Hired for: I was hired as a Support Engineer for maintaining Django and NodeJS backend services. My job was to maintain backend functionality for the various clients of the company.
- Maintained GitHub issues for various projects.
- Debugged and added unit tests to testing suites.
- Debugged and refactored Django and NodeJS functionality to close down issues as they came along.
- Achieved 100% close rate against a company-wide average of 65%, by relentlessly diving into bugs until they could be solved.
- Implemented linting and code checking functionality for 2 projects, significantly improving code quality and development speed.
- Created documentation for various projects and implemented semantic versioning for 2 projects, reducing time spent in debugging and analysis.
Technologies used: Python, JavaScript, Django, NodeJS
Time: 2 months (June 2020 - July 2020)
Projects
Here is a link to my projects page.
End